A general contractor's exposure sits almost entirely with people who do not work for them: every subcontractor can produce a schedule failure, a quality failure, a lien on the owner's property or an insurance gap that lands on the GC's policy — and none of those risks appear in a bid number. This piece covers the five things prequalification actually checks, a process small and mid-sized GCs can run without slowing bid week, the reference questions that produce honest answers, how to award with conditions, the warning signs after award, and two years compared in numbers.
In this article
- Why the sub you never checked is the risk you never priced
- The five things prequalification actually checks
- A process a small GC can actually run
- The reference questions that produce real answers
- What to do with the information at award
- Two projects in numbers
- The thin bidder list problem
- Prequalification does not end at award
- Six mistakes in subcontractor prequalification
- Five numbers to track
- Frequently asked questions
Why the sub you never checked is the risk you never priced
A general contractor's exposure sits almost entirely with people who do not work for them. Every subcontractor on the project can produce a schedule failure, a quality failure, a safety incident, a lien on the owner's property or an insurance gap that lands on the GC's policy — and none of those risks are visible in a bid number.
Prequalification is the process of knowing, before the contract, which of those risks a subcontractor carries. It is not paperwork for its own sake: it is the difference between choosing a price and choosing an outcome.
The cost of skipping it is asymmetric. A sub who is 4% cheaper saves a modest amount; a sub who fails mid-project costs the schedule, the replacement premium, the rework, the owner's confidence and sometimes the entire margin. Builders who have lived through one such failure never skip prequalification again — the discipline is cheap and the education is not.
The five things prequalification actually checks
1. Financial capacity. Can this company fund payroll and materials for the duration and size of your scope? The failure mode is a sub who wins work larger than their working capital and stalls at week six. Indicators include years in business, size of the largest project completed, banking or bonding references, and whether they are asking for terms that suggest a cash squeeze.
2. Capacity and backlog. A capable sub who is already overcommitted is a schedule risk regardless of skill. Asking what else they are running, with what crews, and who their foreman on your job would be, produces more information than any form.
3. Insurance and licensing. Coverage types and limits appropriate to the scope, current certificates, additional insured endorsements where required, and the licensing that the jurisdiction requires for that trade. Requirements vary by state and by project and must be verified against the actual contract documents.
4. Safety record. Written program, training records, incident history and how they handle a near miss. On projects with safety-rated bidding requirements, this is often a gate rather than a preference.
5. Performance history. References from general contractors, not from owners, and the specific question that gets the truth: "would you use them again on a job with a tight schedule?"
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A prequalification process that a small GC can actually run
Large builders run formal prequalification systems. A small or mid-sized GC does not need one, but does need a process that is consistent enough to be fair and quick enough to survive bid week:
- A one-page form capturing entity details, licensing, insurance carrier and limits, years in business, largest project completed, current backlog and three GC references.
- A certificate of insurance requirement checked against the contract, with expiry dates tracked so lapses are caught before they matter.
- Two reference calls, made by the same person every time, using the same three questions.
- A tiered approval: approved for scopes up to a certain value, approved with conditions, or not approved. Most subs are not simply good or bad — they are appropriate for a certain size of work.
The reference questions that produce real answers
Reference calls are usually wasted because the questions invite politeness. Three questions produce information instead:
"What did they do when something went wrong?" Every project has a problem. The answer describes the sub's behavior under pressure, which is what you are actually buying.
"How was their manpower relative to what they promised?" Overcommitment is the most common subcontractor failure and the least likely to be volunteered.
"Would you use them again on a tight schedule?" The hesitation before the answer carries as much information as the answer.
One more that works with peers who trust you: "who else should I be talking to for this trade in this market?" It frequently produces the name of a better subcontractor than the one you were calling about.
What to do with the information at award
Prequalification is only useful if it changes the award decision or the contract terms. Four adjustments are common and reasonable:
- Scope limits. Award a portion rather than the whole, particularly with a new subcontractor.
- Payment structure. More frequent payments to a sub with thin working capital reduces the risk of a stall, and costs the GC nothing but administrative effort.
- Joint checks to suppliers, where material cost is significant and the sub's financial position is uncertain — this protects against the sub being paid and the supplier not, which is how liens appear on the owner's property.
- Bonding requirements for scopes where the exposure justifies the cost, understanding that the cost lands in the price.
These are not punishments; they are how a GC says yes to a promising subcontractor without accepting the full risk of an unknown one.
Two projects in numbers
A mid-sized GC comparing a year before and a year after adopting a prequalification threshold at $75,000 of subcontract value.
- Year one, no process: 41 subcontracts awarded above the threshold. Two failures — one drywall sub who stalled at 60% and one mechanical sub whose insurance had lapsed, discovered during a claim. Direct cost of replacement, acceleration and rework: $187,000. Schedule impact on two projects: 5 and 3 weeks.
- Year two, with the process: 44 subcontracts above the threshold, 6 subcontractors declined at prequalification, 3 awarded with conditions — two on partial scope, one with joint checks to the supplier. Zero failures. Administrative cost of running the process, including reference calls: roughly $14,000 of staff time.
The comparison is not a promise that prequalification prevents every failure; it prevents the predictable ones. Of the six subcontractors declined in year two, four failed the capacity question rather than the skill question — they were good companies bidding work larger than they could staff, which is exactly the failure that had cost $187,000 the year before.
The thin bidder list problem
Prequalification has a cost that nobody mentions: it shrinks the pool. A GC with strict standards in a market with few qualified subcontractors ends up with two bidders per trade, which is a pricing problem and a leverage problem at the same time.
Four practices keep the pool healthy without lowering the standard:
- Prequalify continuously, not at bid time. Meeting subcontractors during slow periods, walking their current jobs and building the list before you need it is the only way to have five bidders on the day it matters.
- Grow subs deliberately. A promising company awarded a $40,000 scope this year, performing well, becomes a $200,000 bidder in two years. GCs that only award to companies already large enough compete for the same handful of subs as everyone else.
- Be the general contractor subs want to work for. Paying on time, running clean sites, providing accurate schedules and answering RFIs quickly are competitive advantages in a tight subcontractor market — the best subs choose their GCs, not the other way around.
- Keep a bench per trade. Three approved names minimum, including one who is hungry and one who is expensive but reliable. The expensive reliable one is what you use when the schedule cannot slip.
Prequalification does not end at award
A subcontractor's financial and staffing position changes during a project, and the warning signs appear weeks before the failure. Four of them are reliable and cost nothing to watch:
Manpower below what was promised, for two consecutive weeks. The single most predictive signal there is. It usually means crews have been moved to another job — often one where the sub is being paid faster.
Requests to change payment terms or ask for early payment. Occasionally routine; frequently the first visible symptom of a cash problem that will become your schedule problem.
Supplier calls to the GC. When a supplier calls asking about payment on your project, the situation is already advanced — this is the moment for joint checks, not for reassurance.
Turnover of the foreman. Losing the person who knows your job resets productivity and is frequently a sign of internal trouble at the sub.
The correct response to any of these is early and unglamorous: a direct conversation, a written record, a recovery plan with dates, and — where the exposure justifies it — protective measures like joint checks. Waiting for the sub to raise the problem is the most common and most expensive choice a GC makes, because by then the options that were cheap have expired.
Six mistakes in subcontractor prequalification
- Checking price and skill only. Neither predicts the failures that actually hurt: capacity, cash and coverage.
- Collecting certificates without tracking expiry. A lapse discovered during a claim is the same as having no coverage.
- Calling owner references instead of GC references. Owners see the finished product; GCs saw the schedule.
- Treating approval as binary. Most subs are right for some scopes and wrong for others.
- Applying the process only to new subs. A long-standing sub can be overcommitted or financially strained this year and fine last year.
- Letting bid day override the process. The low number that skips prequalification is the one most likely to be low for a reason.
Five numbers to track
Five metrics tell you whether the process is working. Percentage of subcontract value awarded to prequalified subs, which measures compliance rather than intention. Subcontractor failures per year, defined as any sub replaced or requiring intervention, with the cost attached. Insurance certificate lapses caught before expiry, the leading indicator of an administrative gap. Average number of qualified bidders per trade, since a thin bidder list is a pricing problem waiting to happen. And schedule impact days attributable to subcontractor performance — the number that converts this discipline from paperwork into the reason the last three projects finished on time.
Find out where your subcontractor risk actually sits
Send us your trade list with the number of approved bidders in each, your subcontract values and any failures from the last two years. We will show which trades are single points of failure, what those failures cost you and where a threshold-based prequalification process would have caught them.
Frequently asked questions
What does subcontractor prequalification check?
Five things, and only one of them is skill. Financial capacity: whether the company can fund payroll and materials for the duration and size of your scope, indicated by years in business, largest project completed, banking or bonding references and whether they are asking for terms that suggest a cash squeeze. Capacity and backlog, since a capable sub who is already overcommitted is a schedule risk regardless of ability — asking what else they are running, with what crews and who the foreman would be produces more than any form. Insurance and licensing, with coverage types and limits appropriate to the scope, current certificates, additional insured endorsements where required and the licensing the jurisdiction demands. Safety record, including written program, training and incident history. And performance history from GC references rather than owner references.
How can a small general contractor prequalify without slowing bid week?
With a threshold and a one-page process. Set a dollar value above which no subcontract is awarded without a completed form and two reference calls, and use judgment below it — that single rule captures most of the benefit while keeping small awards fast. The form captures entity details, licensing, insurance carrier and limits, years in business, largest project completed, current backlog and three GC references. Certificates are checked against the contract with expiry dates tracked so lapses are caught before they matter. Two reference calls are made by the same person every time using the same three questions. And approval is tiered rather than binary: approved up to a certain value, approved with conditions, or not approved — because most subcontractors are not simply good or bad, they are appropriate for a certain size of work.
What reference questions actually produce useful answers?
Three, because the usual questions invite politeness. What did they do when something went wrong — every project has a problem, and the answer describes behavior under pressure, which is what you are actually buying. How was their manpower relative to what they promised — overcommitment is the most common subcontractor failure and the least likely to be volunteered. And would you use them again on a tight schedule, where the hesitation before the answer carries as much information as the answer itself. A fourth question works with peers who trust you: who else should I be talking to for this trade in this market, which frequently produces the name of a better subcontractor than the one you called about. Reference calls should go to general contractors rather than owners, since owners saw the finished product and GCs saw the schedule.
What can a GC do when a subcontractor is promising but risky?
Award with conditions rather than declining outright. Four adjustments are common and reasonable. Scope limits, awarding a portion rather than the whole, particularly with a new subcontractor. Payment structure, using more frequent payments for a sub with thin working capital, which reduces the risk of a stall and costs the GC nothing but administrative effort. Joint checks to suppliers where material cost is significant and the financial position is uncertain, which protects against the sub being paid while the supplier is not — the way liens appear on the owner's property. And bonding requirements for scopes where the exposure justifies the cost, understanding that the cost lands in the price. These are not punishments: they are how a GC says yes to a promising subcontractor without accepting the full risk of an unknown one.
What are the warning signs that a subcontractor is about to fail?
Four, and all of them appear weeks before the failure. Manpower below what was promised for two consecutive weeks, which is the single most predictive signal and usually means crews were moved to a job where the sub is being paid faster. Requests to change payment terms or for early payment, which are occasionally routine and frequently the first visible symptom of a cash problem that is about to become your schedule problem. Supplier calls to the GC asking about payment on your project, which means the situation is already advanced and is the moment for joint checks rather than reassurance. And turnover of the foreman, which resets productivity and often signals internal trouble. The correct response to any of them is early and unglamorous: a direct conversation, a written record and a recovery plan with dates.