Subcontractor prequalification: what GCs check

Prequalification is the gate before the gate. Long before a bid package goes out, a general contractor decides which trades are even allowed to submit a number. That decision rests on prequalification: a structured review of whether a subcontractor can carry the financial, safety, and operational load of the work without putting the project at risk. Get prequalified and you make the bid list. Fail it and your number never gets opened, no matter how sharp the price.

Why do GCs prequalify subcontractors at all?

A GC carries the schedule, the prime contract, and most of the risk. When a sub fails mid-project, the GC eats the consequences: the demobilization, the replacement premium, the schedule slip, and often a default claim against the surety. Prequalification is how a GC prices that risk down before it ever shows up on a job. It is not a credit check for its own sake. It is a read on whether this trade partner can finish what they start at the volume the project demands.

The review usually produces one of three outcomes: a pass, a conditional pass with a single-job ceiling, or a decline. None of it is personal. A sub can be excellent in the field and still fail prequal because the balance sheet is thin or the bonding capacity is already tapped out on other work. The point of the exercise is not to grade character. It is to forecast whether this firm can absorb a tough month, a slow payment cycle, or a labor crunch and still show up Monday.

What financial capacity do GCs check?

Financial capacity is the first screen because money problems sink more subs than bad workmanship. GCs look at three things.

Bonding capacity comes from the surety. A surety will state a single-job limit and an aggregate program limit. If a sub carries a 2,000,000 USD single-job limit and a 6,000,000 USD aggregate limit, and they already have 4,500,000 USD of bonded work in progress, only 1,500,000 USD of aggregate room remains even though the single-job number looks larger. The GC checks remaining capacity, not headline capacity. A sub who bids a 1,800,000 USD scope against 1,500,000 USD of remaining room cannot bond the job, and that ends the conversation.

Credit and the financial statement come next. A reviewed or audited statement carries far more weight than an internal printout. The GC reads working capital, which is current assets minus current liabilities, and the current ratio, which is current assets divided by current liabilities. A current ratio under 1.0 means short-term obligations exceed short-term assets, which is a flag that the firm may struggle to fund payroll and material buys before progress payments land.

Single-job and aggregate exposure also apply outside of bonding. Many GCs set an internal rule that no single sub should hold more than a set share of the GC's awarded volume, so that one trade failure cannot cascade across the portfolio.

How does safety record factor in?

Safety is both a moral line and a financial line item. The headline number is the Experience Modification Rate, the EMR. An EMR of 1.0 is the industry baseline. Below 1.0 means fewer losses than expected for the trade and payroll size; above 1.0 means more. Many owners and GCs set a hard cutoff, commonly 1.0 and sometimes as loose as 1.25, above which a sub cannot be invited regardless of price.

Alongside EMR, GCs pull OSHA history: the recordable incident rate, the DART rate (Days Away, Restricted, or Transferred), and any citations from the last three to five years. A clean record paired with a written safety program, a designated safety officer, and documented training reads very differently from a sub with two willful citations and nothing on paper. On larger or owner-sensitive projects, a high EMR is not a deduction. It is a disqualifier.

What experience and references matter?

A GC wants proof the sub has done this specific scope, at this size, in this region. A drywall sub who has only run 5,000 SF tenant fit-outs is a different risk on a 90,000 SF core-and-shell tower, even if the trade is nominally the same. Means, methods, and crew size do not scale automatically.

Strong references are recent, relevant, and reachable. Three to five completed projects of comparable scope, with owner or GC contacts who will actually return a call, beat a long list of stale jobs from a decade ago. GCs ask references plain questions: did they finish on time, did they staff the job, how did they handle change orders, would you hire them again. One lukewarm reference can undo an otherwise clean file.

How do backlog and capacity get evaluated?

Backlog is current committed work, and it is where good subs quietly take themselves out of the running. A sub can have a clean balance sheet and a strong safety record and still be the wrong pick because they are already carrying more than they can staff. The GC wants to know committed contract value, how much crew is available, and whether the new scope fits the calendar without stretching the workforce thin.

The honest signal here is staffing math, not promises. If a sub runs four crews and all four are committed through the project's framing window, a verbal assurance that they will "find the people" is worth very little in a tight labor market. Experienced GCs weigh backlog against the schedule's critical path and ask for a manpower-loading plan when the scope is large.

What about licensing and insurance?

Licensing and insurance are pass or fail, with no partial credit. The sub must hold the correct state and local trade licenses for the scope and jurisdiction. Insurance has to meet the prime contract's requirements: general liability limits, auto, workers' compensation, and often umbrella coverage, with the GC and owner named as additional insured and the correct endorsements attached. A certificate that is expired, short on limits, or missing the waiver of subrogation will stall an award until it is corrected. This is the most avoidable reason a prequal stalls, and it stalls more often than it should.

What does a prequal scorecard look like?

Many GCs reduce all of this to a weighted scorecard so the decision is consistent across trades and reviewers. Here is an illustrative scorecard (illustrative weights and scores, US market, not a published standard):

• Financial capacity: weight 30 percent, score 80 of 100, weighted points 0.30 x 80 = 24.0
• Safety (EMR, OSHA): weight 25 percent, score 90 of 100, weighted points 0.25 x 90 = 22.5
• Relevant experience: weight 20 percent, score 70 of 100, weighted points 0.20 x 70 = 14.0
• Backlog and capacity: weight 15 percent, score 60 of 100, weighted points 0.15 x 60 = 9.0
• Licensing and insurance: weight 10 percent, score 100 of 100, weighted points 0.10 x 100 = 10.0

Worked example 1, the total. Add the weighted points: 24.0 + 22.5 + 14.0 + 9.0 + 10.0 = 79.5 out of 100. If this GC sets the invite threshold at 75 and a conditional band at 65 to 74, a 79.5 clears the bar and the sub goes on the bid list.

Worked example 2, the backlog swing. Take the same sub but drop the backlog score from 60 to 30 because two big jobs landed last week. The backlog line falls from 0.15 x 60 = 9.0 points to 0.15 x 30 = 4.5 points, a loss of 4.5 points. The new total is 79.5 minus 4.5 = 75.0. That is still a pass, but it sits right on the threshold, so the GC will likely attach a single-job cap or ask for a manpower plan before committing. The same firm, one week apart, moves from comfortable to conditional purely on capacity.

How should a subcontractor prepare a strong prequal package?

Treat the package as a deliverable, not a form. Submit a reviewed or audited financial statement, a current surety letter stating single-job and aggregate limits, an insurance certificate that already matches typical prime requirements, an EMR letter from the carrier, an OSHA 300 log summary, a written safety program, and a project list with reachable references in the same scope and size band. Keep it current. A surety letter dated fourteen months ago invites doubt, and a stale insurance certificate signals a firm that does not stay on top of its paperwork.

A strong package does more than pass. It moves a sub up the invite list. When a GC has room for three electrical bidders and seven firms want in, the cleanest prequal files get the call. And because prequalification controls who bids, it indirectly shapes bid leveling later: a tighter, prequalified field produces more comparable numbers and fewer outliers to reconcile when the bids come in.

This is also where estimating accuracy on the GC side compounds the advantage. Tools like Ruh read the drawings, run the takeoff, and price the scope against the contractor's own price book, then hand a structured basis to the estimator, who reviews and signs off. None of that replaces prequalification judgment, but it lets the GC model each sub's coverage and pricing fit faster and invite the right trade partners with more confidence.

Prequalification rewards the sub who runs the business like a business: clean books, a real safety program, honest backlog, and references who pick up the phone. The field crews win the work in the end, but the office gets you to the bid list. Build the package once, keep it current, refresh the financials and the surety letter on a calendar, and you will spend a lot less time wondering why your number never got opened.