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Interview question bank

Interview questions that test the trade.

My Trade Talent's interview question bank holds 168 technical screening questions for 56 commercial trades roles across 20 trades, three per role, each set with the signals that separate a strong candidate from a plausible one and the hiring mistake that seat invites.

Filter to your trade and role, then send the role to the scorecard builder to print a scorecard both interviewers can use.

56 roles, 168 questions

HVAC & Mechanical

HVAC Service Technician

HVAC & Mechanical
  1. Walk me through diagnosing a rooftop unit that cools fine in the morning and short-cycles by two in the afternoon.
  2. What superheat would you expect on a properly charged R-410A system, and what does it tell you when it reads high?
  3. A tenant says it is too warm and the space is at setpoint. What do you check and in what order?

Listen for

  • Talks in symptoms and causes rather than part numbers - superheat and subcooling readings, not "I replaced the TXV"
  • Has worked unaccompanied on rooftop equipment, not just assisted on installs
  • Can describe a call they diagnosed wrong and what the second visit found

The mistake this seat invites. Hiring on EPA 608 and years of experience without testing diagnostic reasoning. The certification is a floor, not a signal, and residential-heavy experience transfers badly to rooftop and chiller work.

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HVAC Install Technician (Commercial)

HVAC & Mechanical
  1. How do you purge a line set, and what happens downstream if you skip it?
  2. What do you check on a roof curb before the unit lands?
  3. Describe the last VRF system you installed - whose, how many indoor units, and who commissioned it?

Listen for

  • Brazing with nitrogen purge described as routine rather than as a best practice they have heard of
  • Has set equipment by crane and can talk about rigging and roof curb fit
  • VRF experience named by manufacturer, because the commissioning differs

The mistake this seat invites. Treating install and service as interchangeable. A strong install technician may be a slow diagnostician, and a strong service technician may be uneconomic on a production install crew.

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HVAC Controls Technician (BAS / Niagara)

HVAC & Mechanical
  1. Give me a sequence of operations you found wrong during commissioning, and what you changed.
  2. How do you troubleshoot a BACnet MS/TP trunk where one device drops intermittently?
  3. When would you use a Niagara JACE rather than putting everything on the supervisor?

Listen for

  • Platform experience named specifically: Niagara, Metasys, Desigo, Distech, Delta. The platforms are not interchangeable
  • Can read a sequence of operations and say where it will fail in practice
  • Has integrated across protocols - BACnet MS/TP, IP, Modbus - rather than staying inside one vendor

The mistake this seat invites. Screening this seat as an HVAC role. The scarce skill is integration and programming, and the strongest candidates often come from controls contractors or systems integrators rather than mechanical ones.

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HVAC Service Manager

HVAC & Mechanical
  1. What was your technician utilisation, and what did you do that moved it?
  2. How do you decide which maintenance agreements to let go at renewal?
  3. A technician has a second call-back on the same unit. What happens next in your department?

Listen for

  • Talks about utilisation, call-back rate and agreement renewal rate as numbers they owned
  • Has grown a maintenance agreement base, not just serviced one
  • Came up through the field - departments rarely accept a manager who cannot read a work order

The mistake this seat invites. Promoting the best technician into the seat. Field strength does not predict dispatch discipline, and the department loses its best diagnostician in the process.

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HVAC Project Manager (Commercial)

HVAC & Mechanical
  1. Your chiller slipped twelve weeks. Walk me through what you do first.
  2. How do you price and present a change order the general contractor will not want?
  3. At buyout, what do you check before you accept the estimate as your budget?

Listen for

  • Can state the margin they carried and what moved it, not just project values
  • Long-lead equipment procurement described as a scheduling problem they planned around
  • Change-order discipline - documentation habits described without prompting

The mistake this seat invites. Hiring on project size alone. A manager who ran one $20M job may have run one schedule; a manager who ran twelve $2M jobs has run twelve buyouts and twelve closeouts.

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Commercial Construction

Construction Foreman

Commercial Construction
  1. How do you plan tomorrow, and when do you do it?
  2. Material you need on Monday has not arrived. What do you do with the crew?
  3. One of your people is skipping a safety step because it is faster. What happens?

Listen for

  • Describes planning the next day's work the afternoon before
  • Safety described as something they enforce rather than something that happens to them
  • Can talk about a crew member they coached rather than removed

The mistake this seat invites. Assuming the most productive tradesperson becomes the best foreman. The job stops being about personal output on day one.

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Construction Superintendent

Commercial Construction
  1. You are three weeks behind at the halfway point. Walk me through the recovery plan.
  2. How do you run a subcontractor who is under-manning your job for a better one elsewhere?
  3. What does your closeout process look like, and when does it start?

Listen for

  • Talks in sequence and constraint rather than trades and tasks
  • Has run inspections and closeout, not just the productive middle of a job
  • Can describe recovering a slipped schedule with specifics

The mistake this seat invites. Hiring a strong foreman into the seat and finding they still run a crew rather than a job. It is the single most common failure in this role.

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Construction Project Manager

Commercial Construction
  1. How do you and your superintendent divide the job?
  2. The architect is slow on RFIs and the schedule is suffering. What do you do?
  3. Walk me through how you build and defend a change order.

Listen for

  • Describes the PM-superintendent split clearly, and respects it
  • Change-order and documentation discipline described without prompting
  • Can state budget performance and what moved it

The mistake this seat invites. Hiring on project value rather than number of cycles. Buyouts and closeouts are where the skill lives, and they are counted per job.

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Commercial Estimator

Commercial Construction
  1. Two subcontractor quotes are 30% apart. How do you level them?
  2. Which jobs do you recommend not bidding, and on what basis?
  3. Tell me about an estimate that lost money. What did you miss?

Listen for

  • Scope levelling described as the core skill rather than takeoff speed
  • Has a view on which jobs to no-bid and why
  • Can describe a job they priced that went badly and what they got wrong

The mistake this seat invites. Screening on software fluency. Takeoff tools are learnable in weeks; judgement about scope gaps and subcontractor coverage is not.

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Commercial Electrical

Journeyman Electrician (Commercial)

Commercial Electrical
  1. How do you size a feeder for a 200A three-phase panel, and what in the code drives it?
  2. Walk me through your lockout-tagout sequence on a 480V panel.
  3. What is the difference in how you treat a grounded conductor and an equipment grounding conductor on a sub-panel?

Listen for

  • Conduit bending described as routine - offsets, saddles, large-diameter rigid
  • Has worked live-adjacent under NFPA 70E and can describe the boundary rules
  • Commercial and industrial service sizes rather than residential panel swaps

The mistake this seat invites. Taking a state licence as proof of commercial capability. Licensing rules vary by state and many journeyman licences are earned on residential hours.

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Master Electrician

Commercial Electrical
  1. Which jurisdictions are you licensed in, and which of those were reciprocity rather than exam?
  2. An inspector red-tags work you believe is compliant. What do you do?
  3. Which code cycle is the jurisdiction we are hiring for on, and what changed that affects us?

Listen for

  • Names the states and municipalities the licence is active in, and whether by exam or reciprocity
  • Has carried a contractor licence of record, not merely held a master card
  • Inspection relationships described as a working routine rather than an adversarial one

The mistake this seat invites. Assuming the licence travels. Reciprocity is specific and partial, and a master in one state may need to sit an exam in the next one.

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Electrical Foreman

Commercial Electrical
  1. How do you plan a floor's rough-in so the mechanical trades do not strand you?
  2. Your crew is three days behind at the end of week two. What do you change?
  3. How do you handle an apprentice who is fast and sloppy?

Listen for

  • Talks about production rates and manpower loading, not just tasks completed
  • Coordination described from the other trades' side - ductwork and sprinkler mains win ceiling space arguments
  • Has run a crew through an inspection and a punch list

The mistake this seat invites. Promoting on technical skill without testing whether the person will hold other people to a standard. The quietest strong journeyman is not automatically a foreman.

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Commercial Electrical PM

Commercial Electrical
  1. Gear is quoted at 40 weeks. How does that change your buyout and your schedule?
  2. How do you build a manpower curve, and who do you build it with?
  3. Describe a change order that was denied. What did you do next?

Listen for

  • Switchgear and transformer lead times discussed as a planning input, not a surprise
  • Can describe how they forecast manpower with the foreman rather than at them
  • Billing and retainage described in detail - cash position is part of the job

The mistake this seat invites. Hiring a strong foreman into the seat and expecting the commercial instincts to follow. The two jobs share a vocabulary and almost nothing else.

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Commercial Plumbing

Journeyman Plumber (Commercial)

Commercial Plumbing
  1. How do you size a vent for a battery of fixtures, and what goes wrong if you undersize it?
  2. When would you use press fittings on a commercial domestic water line, and when would you not?
  3. Walk me through testing a sanitary system before the walls close.

Listen for

  • Pipe materials and joining methods described by application rather than preference
  • Has worked to a riser diagram and coordinated sleeves and penetrations before the pour
  • Medical gas or backflow certification where the work calls for it

The mistake this seat invites. Hiring residential service plumbers for commercial construction. The diagnostic skill is real but the coordination and layout demands are a different job.

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Master Plumber

Commercial Plumbing
  1. Which jurisdictions are you licensed in, and which were reciprocity?
  2. Which plumbing code is in force where we work, and what changed in the last cycle that affects commercial jobs?
  3. Describe a time you told a project manager a design would not pass. What happened?

Listen for

  • States which jurisdictions the licence covers and how it was obtained
  • Has been the licence of record for a contractor, with the exposure that carries
  • Can talk through a plan review conversation with an AHJ

The mistake this seat invites. Treating the master licence as a seniority marker rather than a liability position. The person whose licence permits the work needs the authority to stop it.

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Commercial Plumbing PM

Commercial Plumbing
  1. Owner-furnished fixtures are eight weeks late. What do you do about the schedule and the contract?
  2. How do you run coordination with the mechanical contractor on a tight ceiling?
  3. What do you verify at buyout before accepting the estimator's numbers?

Listen for

  • Fixture schedules and owner-furnished equipment described as a tracked risk
  • Coordination with mechanical described in terms of sequence and space, not goodwill
  • Can state the margin carried and what moved it

The mistake this seat invites. Underweighting procurement. On commercial plumbing the schedule is usually lost in the submittal and fixture cycle rather than in the field.

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Commercial Roofing

Commercial Roofing Foreman

Commercial Roofing
  1. Tear-off is open and a storm is two hours out. What is your sequence?
  2. Walk me through flashing a curb-mounted unit on a TPO roof.
  3. The deck under the old system is worse than the bid assumed. Who do you call and in what order?

Listen for

  • Names the systems worked rather than saying "commercial roofing" - TPO, EPDM, modified bitumen, built-up, standing seam
  • Treats detail work - curbs, penetrations, parapets, drains - as the part that decides whether the roof leaks
  • Can describe a dry-in plan for a partial tear-off with rain forecast

The mistake this seat invites. Hiring on square footage installed rather than on detail work and dry-in judgement. Roofs fail at penetrations and terminations, not in the field of the membrane.

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Commercial Roofing PM

Commercial Roofing
  1. What does a manufacturer need from you before they will issue an NDL warranty?
  2. Three roofs, two crews, and a week of rain. How do you re-sequence?
  3. How do you price and document unforeseen deck replacement?

Listen for

  • Understands that the manufacturer warranty is a document trail, not a handshake
  • Has scheduled around weather and material lead times as a normal constraint rather than an excuse
  • Can describe pricing a deck-condition change order that was found after tear-off

The mistake this seat invites. Treating the role as general construction project management. Roofing is warranty-driven and weather-driven in ways other trades are not.

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Commercial Roofing Service Technician

Commercial Roofing
  1. A tenant reports a ceiling stain twenty feet from the nearest penetration. How do you find the source?
  2. How do you repair a TPO seam failure so the warranty survives it?
  3. What goes in a preventive maintenance report that makes an owner approve the repair?

Listen for

  • Describes leak tracing as a diagnostic process rather than patching the nearest suspect spot
  • Comfortable writing the condition report the owner actually reads
  • Has worked across several membrane types, because service work does not get to choose

The mistake this seat invites. Screening for installation experience. Service technicians diagnose and write; installers produce. The overlap is smaller than it looks.

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Fire Protection

Fire Alarm Technician

Fire Protection
  1. Walk me through an NFPA 72 acceptance test on a new addressable system.
  2. A device keeps reporting a ground fault intermittently. How do you isolate it?
  3. How do you handle the elevator recall interface on a retrofit?

Listen for

  • NICET level stated, and the candidate knows what it did and did not qualify them for
  • Names specific panel platforms programmed rather than listing manufacturers seen
  • Has run an acceptance test with an AHJ present and can describe how it went wrong once

The mistake this seat invites. Treating this as low-voltage electrical work. The code knowledge and the AHJ relationship are the job; pulling the cable is the easy part.

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Fire Sprinkler Fitter

Fire Protection
  1. What changes when you install a dry system in an unheated warehouse rather than a wet system?
  2. The drawing puts a head where a duct now runs. What do you do?
  3. Walk me through a 200 psi hydrostatic test and what you watch for.

Listen for

  • Can read a sprinkler shop drawing and spot where it will not fit the ceiling that is actually there
  • Knows why a dry system behaves differently from a wet one in both installation and trouble calls
  • Has done hydrostatic testing and can describe a failed test and the fix

The mistake this seat invites. Screening on pipefitting experience alone. The pipe skills transfer; the code, the head spacing rules and the testing discipline do not come with them.

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Fire Alarm / Sprinkler Designer

Fire Protection
  1. How do you choose the remote area for a hydraulic calculation?
  2. An AHJ rejects your head spacing in a sloped-ceiling area. What is the likely reason?
  3. How do you coordinate sprinkler mains against mechanical in a tight plenum?

Listen for

  • Hydraulic calculation described as judgement about the remote area, not as software output
  • Has had designs rejected by an AHJ and can say why and what changed
  • Coordinates with ductwork and structure before issuing, not after

The mistake this seat invites. Hiring on CAD or HydraCAD fluency. The software is learnable; knowing which calculation to run and which AHJ will question it is not.

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Paving & Asphalt

Asphalt / Paving Operator

Paving & Asphalt
  1. The mat is tearing behind the screed. What are you checking first?
  2. How does your rolling pattern change on a cold night versus a hot afternoon?
  3. When do you stop paving rather than place a load you are unsure about?

Listen for

  • Names the specific machines run and the mix types placed, not "paving equipment"
  • Describes rolling pattern and mat temperature as linked decisions
  • Has run night work and understands what cooling time does to the pattern

The mistake this seat invites. Hiring on hours in a seat. The operators worth having are the ones who read the mat and speak up; that is not on a resume.

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Paving Foreman

Paving & Asphalt
  1. Trucks are arriving fifteen minutes apart on a job that needs continuous paving. What do you do?
  2. How do you build and compact a longitudinal joint?
  3. Density came back short on a lot. How do you find out why?

Listen for

  • Treats truck sequencing and plant coordination as part of quality, not logistics
  • Can describe building a longitudinal joint that will not ravel
  • Has owned density and smoothness results, including a failing one

The mistake this seat invites. Promoting the best operator. Running the crew is a scheduling and coordination job, and the two skills do not always live in the same person.

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Screed Operator

Paving & Asphalt
  1. What causes a repeating ripple in the mat and how do you stop it?
  2. When would you run a 30-foot ski rather than a shorter reference?
  3. Your head of material keeps swinging. What is happening upstream?

Listen for

  • Understands head of material as the primary variable rather than screed adjustment
  • Has used stringline, ski and averaging beam references and knows when each applies
  • Can describe chasing and fixing a recurring bump without over-correcting

The mistake this seat invites. Treating this as an entry rung behind the paver operator. Smoothness incentives and penalties land on this seat, and experienced screed hands are the scarcest part of a paving crew.

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Commercial Landscaping

Landscape Crew Lead

Commercial Landscaping
  1. A property manager says the site looks worse than last month. How do you find out what changed?
  2. How do you adjust the route when you are a crew member short?
  3. Walk me through your spring prune on a commercial frontage.

Listen for

  • Describes the route as a quality problem rather than a time problem
  • Can identify common plant material and its failure modes in their region
  • Bilingual crew leadership where the crew needs it, stated plainly

The mistake this seat invites. Hiring on equipment experience. Crew leads are judged on what the property looks like, which depends on horticultural judgement and crew management more than on mower hours.

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Landscape Foreman

Commercial Landscaping
  1. The plan calls for a tree where there is now a utility. What happens next?
  2. How do you prepare a bed that has been compacted by construction traffic?
  3. Walk me through your punch walk and what you fix before the owner arrives.

Listen for

  • Reads a landscape plan and can price the gap between it and the site conditions
  • Treats drainage and soil preparation as the part that decides whether the plants survive
  • Has run installation under a general contractor schedule, not just maintenance

The mistake this seat invites. Hiring maintenance experience for installation work or the reverse. Both are landscaping; the plan reading, grading and schedule pressure of installation are a different job.

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Landscape Account Manager

Commercial Landscaping
  1. Walk me through a renewal conversation with a property manager who thinks the price is too high.
  2. How do you find enhancement work on a site that already looks acceptable?
  3. A crew has damaged a client plant. What do you do in the first hour?

Listen for

  • Can state renewal retention on their book and what drove the losses
  • Sells enhancements by walking the property rather than by sending a list
  • Knows the horticulture well enough to be believed by the crews and the client

The mistake this seat invites. Hiring a salesperson without the horticulture. Property managers notice quickly when the account manager cannot answer a question about their own site.

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Landscape Project Manager

Commercial Landscaping
  1. The specified tree size is unavailable in the region. How do you handle the substitution?
  2. How do you protect your installation when you are the last trade on a congested site?
  3. What does your warranty walk look like and when do you schedule it?

Listen for

  • Has sourced plant material against a specification and managed substitutions
  • Understands establishment and warranty obligations as a cost to be scheduled
  • Can work to a general contractor schedule that treats landscape as the last trade in

The mistake this seat invites. Underestimating the establishment period. The job is not finished at installation, and project managers who schedule it that way lose the warranty argument.

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Commercial Painting

Commercial Painter

Commercial Painting
  1. How do you prep and prime new drywall versus previously painted CMU?
  2. You are spraying in an occupied corridor overnight. What is your containment plan?
  3. What causes flashing on a repaint and how do you prevent it?

Listen for

  • Talks about preparation and masking time as the majority of the job
  • Spray experience stated with the equipment and the coatings, not just "sprayer"
  • Has worked occupied buildings and understands containment and odour control

The mistake this seat invites. Screening on speed. Callbacks on commercial painting come from preparation and from damage to adjacent work, both of which look like slowness on day one.

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Industrial Painter / Coatings

Commercial Painting
  1. What is the difference between SSPC-SP6 and SP10, and when does the spec call for each?
  2. How do you verify a three-coat system was applied to the specified thickness?
  3. Describe a coating failure you have seen and what caused it.

Listen for

  • Knows SSPC surface preparation standards by number and what each one actually produces
  • Measures wet and dry film thickness as a matter of course
  • Has worked under containment with the respiratory and confined-space training to match

The mistake this seat invites. Treating industrial coatings as painting with better pay. The inspection regime, the safety requirements and the failure consequences are different work.

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Commercial Painting Foreman

Commercial Painting
  1. The general contractor compresses your schedule by two weeks. What changes?
  2. How do you protect finished walls when flooring and casework follow you?
  3. How do you work a punch list of three hundred items across four floors?

Listen for

  • Schedules painting around the trades that will damage it, rather than after them
  • Can describe manpower loading on a job that compressed
  • Owns the punch list without treating it as someone else's fault

The mistake this seat invites. Promoting the best painter. The foreman job is sequencing against other trades and defending finished work, which is coordination rather than craft.

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Commercial Flooring

Commercial Carpet Installer

Commercial Flooring
  1. How do you test a slab for moisture and what reading stops the installation?
  2. How do you lay out seams in a corridor with windows down one side?
  3. What goes wrong with quarter-turn carpet tile installation and how do you avoid it?

Listen for

  • Tests and documents subfloor moisture rather than assuming the slab is ready
  • Plans seams against the light and the traffic pattern, not just the roll width
  • Has installed carpet tile in occupied space in phases

The mistake this seat invites. Hiring on square footage installed and skipping the subfloor questions. The moisture test is the part that decides whether the job comes back.

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LVT / Hard Surface Installer

Commercial Flooring
  1. The slab is out of flat by a quarter inch over ten feet. What do you do before you install?
  2. How do you choose between a pressure-sensitive and a hard-set adhesive?
  3. Walk me through heat-welding a sheet vinyl seam in a patient room.

Listen for

  • Treats substrate flatness as the controlling variable, because LVT telegraphs everything under it
  • Knows which adhesive goes with which product and moisture condition
  • Has heat-welded sheet vinyl seams in healthcare or similar environments

The mistake this seat invites. Assuming carpet installers convert directly. Resilient work is less forgiving of the substrate and the adhesive choice, and the failures are visible.

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Polished Concrete Installer

Commercial Flooring
  1. The owner wants Class C aggregate exposure on a slab that was finished hard. What do you tell them?
  2. Walk me through your grit sequence to an 800 finish.
  3. When do you apply densifier and what goes wrong if you apply it too early?

Listen for

  • Speaks in grit sequence and exposure class rather than "polished"
  • Assesses the slab before committing to a finish level
  • Understands densifier timing and what happens when it is rushed

The mistake this seat invites. Selling or hiring against a photograph. The finish achievable depends on the existing slab, and the expectation conversation is part of the skill.

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Commercial Flooring PM

Commercial Flooring
  1. Moisture testing comes back high two days before installation. What happens?
  2. How do you phase a floor replacement in an occupied office?
  3. A dye lot shortage leaves you short on a corridor. What are your options?

Listen for

  • Manages dye lot and lead time as a scheduling constraint from the start
  • Has made the moisture mitigation call and can explain who paid for it
  • Phases occupied-building work around the tenant, not around the crew

The mistake this seat invites. Treating flooring as a commodity buy. The moisture decision and the phasing plan are where the margin and the disputes live.

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Commercial Cleaning & Facilities

Janitor / Custodial Technician

Commercial Cleaning & Facilities
  1. What dwell time does your disinfectant need and what happens if you wipe it early?
  2. Walk me through stripping and refinishing a VCT corridor overnight.
  3. How do you clean a restroom so it stays acceptable for eight hours, not one?

Listen for

  • Knows the difference between cleaning, sanitising and disinfecting, and when each is required
  • Has worked to a documented protocol - healthcare, food plant, or similar - not just a checklist
  • Floor care experience stated specifically: stripping, refinishing, burnishing, extraction

The mistake this seat invites. Treating the seat as unskilled and hiring purely on availability. Turnover costs more than the wage difference, and protocol-trained cleaners are a different labour market.

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Cleaning Supervisor

Commercial Cleaning & Facilities
  1. Two people no-show on a four-person building. What do you do?
  2. How do you inspect a site and what do you do with the result?
  3. A client complains about restrooms every Monday. How do you diagnose it?

Listen for

  • Can state how they cover a call-out at nine at night without the client noticing
  • Inspects against a written standard and keeps the record
  • Has managed supply and equipment budgets, which is where the margin leaks

The mistake this seat invites. Hiring on cleaning skill rather than on staffing and retention. Supervisors are judged on coverage and turnover far more than on technique.

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Welding & Fabrication

Commercial Welder

Welding & Fabrication
  1. Which certifications are current, in which positions, and when were they last renewed?
  2. What does the WPS tell you about preheat and interpass temperature, and why does it matter?
  3. You have porosity in a flux-core weld outdoors. What are you checking?

Listen for

  • States current certifications by process, position and material, with the dates
  • Can read a WPS and say what in it constrains the work
  • Fit-up described as part of the job rather than someone else's step

The mistake this seat invites. Accepting "certified welder" without the process, position and expiry. Certifications are specific and they lapse, and the weld test will find out before the job does.

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Masonry & Concrete

Bricklayer / Mason

Masonry & Concrete
  1. How do you set out a wall so the coursing lands correctly at the openings?
  2. Which mortar type for a structural CMU wall, and why not the one you use on veneer?
  3. Walk me through flashing and weeps at the base of a cavity wall.

Listen for

  • Coursing and layout described as the part that cannot be fixed later
  • Knows mortar types and where each is required rather than using one everywhere
  • Understands flashing, weeps and air gaps as the wall's drainage system

The mistake this seat invites. Hiring on units laid per day. Layout and water management decide whether the wall is right; speed only matters after that.

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Concrete Finisher

Masonry & Concrete
  1. How do you know when the slab is ready to float, and what happens if you start early?
  2. Where do your control joints go on a slab with columns, and why there?
  3. The forecast says rain in two hours and the truck is on site. What do you do?

Listen for

  • Reads the set rather than working to a clock
  • Knows what jointing is for and where the joints have to land
  • Has finished to a flatness specification and knows how it was measured

The mistake this seat invites. Screening on general construction labour history. Finishing is a timing judgement under weather pressure, and a slab finished wrong cannot be redone.

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Physical Security

Security Systems Installer / Technician

Physical Security
  1. A reader works but the door will not unlock. How do you isolate the fault?
  2. How do you handle egress and fire alarm release on an access-controlled door?
  3. Cameras drop off the recorder intermittently. Where do you start?

Listen for

  • Names platforms configured - access control and video management by product - rather than listing manufacturers seen
  • Comfortable on the network side: addressing, VLANs, PoE budgets, switch configuration
  • Has integrated door hardware with fire alarm and life-safety egress requirements

The mistake this seat invites. Confusing this role with security guard staffing. It is a low-voltage technical trade with IT skills attached, and it is priced accordingly.

Print a scorecard for this role Physical Security hiring kit Role profile

Low-Voltage Electrician (Security Specialty)

Physical Security
  1. What licence do you hold for low-voltage work in this state and what does it cover?
  2. How do you certify a structured cabling run and what do you do with a failed test?
  3. Where does your PoE budget run out on a switch and how do you plan for it?

Listen for

  • Licensing stated accurately for the state, because low-voltage licensure varies and matters
  • Terminations and testing described with the standard used, not just "ran the cable"
  • Understands where limited-energy work still falls under the electrical code

The mistake this seat invites. Assuming a licensed electrician can drop straight in. The code sections, the testing standards and the licensure are a different specialty, and the reverse assumption is just as wrong.

Print a scorecard for this role Physical Security hiring kit Role profile

Integration Engineer / Systems Integrator

Physical Security
  1. How do you size recording storage for a two hundred camera system at thirty days?
  2. Walk me through integrating access control with an enterprise directory.
  3. How do you cut over a live access control system without leaving doors unsecured?

Listen for

  • Thinks in systems and interfaces rather than devices
  • Has done an identity or directory integration and can describe what broke
  • Can size storage and bandwidth for a camera count and retention requirement

The mistake this seat invites. Hiring a field technician into a design seat. The integration role is architecture and commissioning, and the failure mode is a system that passes device-by-device and fails as a whole.

Print a scorecard for this role Physical Security hiring kit Role profile

Insulation

Insulation Worker, Mechanical

Insulation
  1. How do you insulate a chilled water line so it does not sweat inside the jacket?
  2. Which material for a 450 degree steam line, and why not fibreglass?
  3. How do you build a removable cover for a valve that gets serviced?

Listen for

  • Vapour barrier integrity described as the controlling detail on cold work
  • Knows which material goes on which service temperature rather than using one system everywhere
  • Fitting work - elbows, valves, hangers, removable covers - described as the skilled part

The mistake this seat invites. Treating mechanical and building insulation as the same trade. Mechanical insulation is fitting work on live systems with material selection attached, and it is the better-paid side.

Print a scorecard for this role Insulation hiring kit Role profile

Insulation Worker, Floor/Ceiling/Wall

Insulation
  1. How do you insulate and air seal a rim joist so it passes inspection?
  2. What do you do where insulation meets a rated wall penetration?
  3. What goes wrong with batt installation that still looks finished?

Listen for

  • Air sealing treated as part of the install rather than a separate trade
  • Knows the fire-stopping and draft-stop requirements at penetrations and rated assemblies
  • Spray foam work stated with the training and respiratory protection it requires

The mistake this seat invites. Assuming any insulation experience covers it. Compressed or gapped batts pass a glance and fail the blower door, and inspectors increasingly check.

Print a scorecard for this role Insulation hiring kit Role profile

Commercial Pest Control

Pest Control Technician (Licensed Applicator)

Commercial Pest Control
  1. Which licence categories do you hold and when do they renew?
  2. A food plant has recurring activity in one zone. How do you work it?
  3. What goes in your service documentation for a third-party audit?

Listen for

  • Licence and category stated for the state, with renewal and CEU status current
  • Identifies before treating, and says so without being prompted
  • Has worked audited accounts - food processing, healthcare, warehousing - and knows what the auditor looks for

The mistake this seat invites. Hiring on route experience without checking the licence category against the accounts. An applicator licensed for general pest is not licensed for everything the book contains.

Print a scorecard for this role Commercial Pest Control hiring kit Role profile

Elevator Maintenance

Elevator Mechanic / Service Technician

Elevator Maintenance
  1. Which licence do you hold and in which states does it travel?
  2. A car is shutting down intermittently with no fault logged. How do you work it?
  3. Walk me through adjusting a door operator that is nuisance-reversing.

Listen for

  • Union apprenticeship or state licence stated accurately, with the jurisdiction
  • Names controller platforms troubleshot rather than manufacturers seen
  • Door-related callbacks treated as the bulk of service work, because they are

The mistake this seat invites. Recruiting this seat like general mechanical maintenance. It is a licensed, largely unionised trade with a controlled supply of labour, and the hiring process has to respect that.

Print a scorecard for this role Elevator Maintenance hiring kit Role profile

Elevator Project Manager

Elevator Maintenance
  1. What drives your schedule on a modernisation, and what do you order first?
  2. The hoistway is not ready on the date you were promised. What do you do?
  3. Walk me through the inspection and permitting sequence to turnover in this state.

Listen for

  • Plans around equipment lead times as the dominant schedule constraint
  • Knows the state inspection and permitting path, which is not the same in two places
  • Has coordinated hoistway readiness with a general contractor and been let down once

The mistake this seat invites. Treating it as general construction project management. The equipment lead times, the licensed labour and the state inspection regime are the whole schedule.

Print a scorecard for this role Elevator Maintenance hiring kit Role profile

QEI-Certified Inspector

Elevator Maintenance
  1. Walk me through a category one test and the items that most often fail.
  2. How do you handle a unit that is unsafe but in service in an occupied building?
  3. How do you word a finding so the owner knows what is a violation and what is advice?

Listen for

  • QEI certification current, with the certifying organisation and the jurisdictions worked
  • Can describe a category five test and what commonly fails it
  • Writes findings that distinguish code violations from maintenance recommendations

The mistake this seat invites. Assuming any experienced mechanic can take the seat. QEI is a separate certification with its own examination and continuing requirements, and the pool is small.

Print a scorecard for this role Elevator Maintenance hiring kit Role profile

LED & Solar

Solar Photovoltaic Installer

LED & Solar
  1. How do you attach racking on a membrane roof without voiding the warranty?
  2. What does the code require for rapid shutdown and how do you verify it works?
  3. A string is reading low at the combiner. How do you trace it?

Listen for

  • Knows the attachment detail and who holds the roof warranty
  • Describes rapid shutdown and labelling requirements as code, not paperwork
  • Fall protection stated as a working practice rather than a certificate

The mistake this seat invites. Hiring residential installers for commercial work without checking the structural and electrical scale-up. The systems, the attachments and the inspection are different.

Print a scorecard for this role LED & Solar hiring kit Role profile

Electrician (LED & Solar)

LED & Solar
  1. Walk me through an interconnection from application to permission to operate.
  2. How do you size conductors and overcurrent protection on a PV circuit?
  3. A networked lighting control system is not holding its schedule. How do you commission it?

Listen for

  • Electrical licence current for the jurisdiction, stated without hedging
  • Has done an interconnection and dealt with the utility, not just the inverter
  • Lighting controls described as commissioning work rather than device installation

The mistake this seat invites. Treating retrofit work as device swapping. The licensed electrical scope, the interconnection and the controls commissioning are where the job succeeds or stalls.

Print a scorecard for this role LED & Solar hiring kit Role profile

Commercial Trucking

CDL-A Truck Driver

Commercial Trucking
  1. Walk me through securing a piece of equipment on a flatbed.
  2. You are approaching your hours limit and the receiver is running late. What do you do?
  3. What do you check on a pre-trip that drivers most often skip?

Listen for

  • Clean MVR and a stable work history, with gaps explained rather than hidden
  • Endorsements stated - tanker, hazmat, doubles - with current medical card
  • Load securement described specifically for the trailer type they actually run

The mistake this seat invites. Hiring on licence class alone. Insurability, MVR and endorsement fit decide whether the driver can actually run the work, and that is checked before the interview, not after.

Print a scorecard for this role Commercial Trucking hiring kit Role profile

CDL-B Truck Driver

Commercial Trucking
  1. What equipment have you operated from the truck, and what certifications go with it?
  2. How do you set up and level a boom truck on a sloped site?
  3. What is on your pre-trip for a dump truck that is not on a straight truck?

Listen for

  • Equipment operation on the truck described as part of the job, because it usually is
  • Endorsements and any crane or equipment certifications stated with the licence
  • Comfortable with the customer-facing and crew-facing side of a service truck

The mistake this seat invites. Treating the seat as a lower rung of CDL-A. On trades work the value is the equipment operation and the site conduct, not the driving.

Print a scorecard for this role Commercial Trucking hiring kit Role profile

Commercial Irrigation

Irrigation Technician / Installer

Commercial Irrigation
  1. A zone will not come on and the controller shows no fault. How do you trace it?
  2. How do you check that a zone is applying water evenly?
  3. Walk me through winterising a commercial system.

Listen for

  • Uses a wire tracker and a solenoid test rather than digging to find the fault
  • Knows head spacing and precipitation rate, not just which head fits
  • Has programmed smart controllers and understands what the sensors are actually doing

The mistake this seat invites. Hiring landscape labourers into irrigation service. The troubleshooting is electrical and hydraulic diagnosis, and installation experience does not supply it.

Print a scorecard for this role Commercial Irrigation hiring kit Role profile

Backflow Prevention Specialist

Commercial Irrigation
  1. Which assembly is required on a high-hazard connection, and why not a double check?
  2. Walk me through a reduced pressure assembly test and what a failure looks like.
  3. When was your gauge last calibrated and who holds the record?

Listen for

  • Certification current for the jurisdiction, with gauge calibration in date
  • Knows which assembly type is required for which hazard level
  • Describes the filing and recordkeeping as part of the job rather than paperwork after it

The mistake this seat invites. Assuming an irrigation technician can test. Backflow certification is separate, jurisdiction-specific, and the test is only valid if the tester and the gauge are both current.

Print a scorecard for this role Commercial Irrigation hiring kit Role profile
Questions

About the question bank.

Is there a free interview question bank for commercial trades hiring?

My Trade Talent's interview question bank holds 168 technical screening questions for 56 commercial trades roles across 20 trades, three per role, each set with the signals that separate a strong candidate from a plausible one and the hiring mistake that seat invites. It is free and open, with no sign-up, and every set links to a printable scorecard for the role.

What interview questions should I ask a commercial HVAC service technician?

Test diagnostic reasoning, not just the EPA 608 card. My Trade Talent's question bank asks: "Walk me through diagnosing a rooftop unit that cools fine in the morning and short-cycles by two in the afternoon." "What superheat would you expect on a properly charged R-410A system, and what does it tell you when it reads high?" "A tenant says it is too warm and the space is at setpoint. What do you check and in what order?"

Why technical questions rather than behavioural ones?

Because everyone who applies for a trades seat will claim the experience. A technical question about a real fault, code or sequence exposes whether the candidate has done the work, which a question about teamwork or strengths does not.

How do I score the answers consistently?

Use the scorecard builder: pick the role and it prints the same questions and strong-candidate signals as rated rows on a 1 to 4 scale, so two interviewers score the same things the same way.

Trade Talk A monthly hiring brief for commercial trades employers

What changed in your trade this month, and what to do about it.

One email a month, and only one. We write a separate issue for every trade we recruit in, so you get yours - not a round-up with your trade buried in paragraph nine. Every issue is written for the person actually doing the hiring.

  • Where wages moved in your trade, by market, and what that does to your next offer
  • How long roles like yours are taking to fill, and where it is getting worse
  • Interview and screening tactics that are landing candidates this month
  • What contractors competing for the same people are doing differently

Built on federal wage data, our own closed searches, and what we hear on the desk every week. Written for employers, not candidates. No pitch, no filler, one click to leave.

Pick your trade. That is the one issue you get, once a month.

One email a month. Your trade and your address, nothing else - we do not sell either, and you can unsubscribe from the bottom of any issue. Read this month's issue for your trade first →