A practical framework for vetting subcontractors before they enter your bid list — insurance, bonding, safety, financial health, trade fit, and the re-qualification cadence that keeps it current.
Prequalification is the cheapest insurance a GC buys. Filtering vendors before they bid is far less expensive than terminating them mid-project. The numbers are clear.
Reduction in subcontractor performance failures when prequalification gates are enforced before bid invitations are issued.
Average direct cost of replacing a defaulted subcontractor mid-project — before counting schedule delays and bonding-claim impact.
Of project delays are directly attributable to subcontractor performance failures that proper prequalification would have caught.
Insurance is the GC’s firewall against sub-driven liability. Verify coverages, limits, and endorsements before issuing the bid invitation — not after the contract is awarded.
$1M per occurrence / $2M aggregate is the typical floor. High-value or high-risk projects often require $2M / $4M. Verify the policy includes products-completed operations and that your firm is named as additional insured on a primary, non-contributory basis.
Required by state law for any sub with employees. Verify state-specific limits, waiver of subrogation in your favor, and that all workforce categories (including 1099 labor where state allows) are covered. Sole proprietors may carry a state-specific exemption form.
$1M combined single limit minimum, covering owned, hired, and non-owned vehicles. Critical for any sub bringing equipment, deliveries, or crew transport to site. Confirm coverage extends to all vehicles used on your project, not just titled fleet.
Sits above primary GL, auto, and WC. Typical floor is $2M; high-rise, mission-critical, or hot-work-heavy projects often require $5M–$10M. Confirm follow-form structure so umbrella mirrors primary endorsements (especially additional insured status).
Required for design-build subs, MEP firms doing performance specs, and any sub whose scope involves engineering judgment. $1M–$2M is typical. Without it, design errors flow to the GC’s general liability, which excludes professional services.
An insured sub can still default. Bonding is a surety’s underwritten judgment that the sub can finish the job — and its guarantee that someone pays if they don’t. It is verified from different documents, against different thresholds, than any insurance certificate.
For subs over a value threshold (commonly $250K–$500K), require a current letter from the surety confirming single-job and aggregate bonding capacity. Capacity already committed to other work counts against the aggregate — ask what is available, not what is theoretical.
A bond is only as good as the company standing behind it. Confirm the surety carries an A.M. Best rating of A- or better and appears on the Treasury Department’s T-list (Circular 570) for federal work. A strong sub with a weak surety is an unbonded sub in practice.
The performance bond funds completion if the sub defaults; the payment bond keeps their unpaid suppliers and lower-tier subs from liening the project. Premiums typically run 1–3% of contract value and are priced into the bid — a sub who cannot obtain them at that cost is telling you what their surety thinks.
Bond critical-path and long-lead trades even below the dollar threshold — a defaulting drywaller is a change order, a defaulting elevator sub is a schedule event. Where a full bond is disproportionate, a subguard program or retention adjustment covers the same risk at lower cost.
Safety prequalification looks at outcome metrics (EMR, DART, OSHA logs) and program metrics (written program, training, leadership) together. A clean EMR with no underlying program is a lagging indicator that may already be turning.
| Metric | Source | Acceptable | Conditional | Disqualifying |
|---|---|---|---|---|
| Experience Modification Rate (EMR) | NCCI / state rating bureau | ≤ 1.00 | 1.01 – 1.25 | > 1.25 |
| OSHA Recordable (TRIR) 3-yr avg | OSHA 300 logs | < 3.0 | 3.0 – 5.0 | > 5.0 |
| DART rate 3-yr avg | OSHA 300 logs | < 1.5 | 1.5 – 2.5 | > 2.5 |
| Written safety program | Sub submission | Yes, current | Yes, > 2 yrs old | No |
| 10-hour OSHA training rate (workforce) | Training records | ≥ 90% | 70 – 90% | < 70% |
| Serious / willful OSHA citations (3 yrs) | OSHA establishment search | None | One, abated | Multiple or unabated |
Financial qualification protects against mid-project default. Three years of CPA-prepared financials is the standard ask. The four signals below give a fast read on whether the sub can carry the float a project requires.
Pays vendors at or before terms. Below 70 means slow-pay; below 50 indicates active distress with suppliers and likely liquidity strain.
Current assets divided by current liabilities. Below 1.2 signals tight liquidity; below 1.0 means the firm cannot cover the next twelve months from working capital.
Total liabilities divided by equity. Above 4.0 raises questions about over-leverage; spikes year-over-year are an early-warning signal even if absolute level is acceptable.
Three recent projects of similar scope and size. Ask about schedule performance, change-order behavior, safety, and whether the reference would hire them again.
A sub may pass insurance, safety, and financials and still be the wrong choice for a given project. Capability fit checks that the work falls inside the sub’s actual sweet spot — not at the edge of it.
Confirm state and trade licenses are current, in good standing, and cover the specific scope. License classes vary by state; a residential license does not cover commercial structural steel even if both are held by the same firm.
Largest project completed should be at least 70% of the new project value. Subs working at the top of their experience curve have higher schedule and quality risk than subs working at 30–70% of their max capacity.
A sub two states away may be capable on paper but expensive to mobilize, slow to respond to RFIs, and difficult to staff when the project hits a crunch. Prefer subs whose home market is the project market or one adjacent to it.
Ask for current backlog and committed work over the project window. Subs running at > 90% of capacity often shift their best crews to their largest customer; you may not be that customer. Capacity at 50–75% is the sweet spot.
For critical-path scopes, name the project manager, superintendent, and foreman in the prequalification package. Personnel changes mid-project are a leading indicator of performance failure. Bind continuity in the contract where possible.
Most prequalification programs fail not at the front gate but at the back — coverage lapses, EMRs creep, financials deteriorate, and nobody catches it until something goes wrong. Continuous re-qualification closes the loop.
Every active sub re-submits the full package once a year. Set the cadence early (Q1 most common) and enforce it. Subs who miss the deadline are removed from the active list until they catch up. Treat the deadline as non-negotiable.
Most COIs renew annually. Track every policy’s expiration date and trigger an automated reminder 30 / 14 / 7 days out. Subs with lapsed coverage cannot work, sign new contracts, or invoice on existing ones until refreshed.
Major safety incidents, lien claims, key personnel departures, M&A events, and significant performance failures all force a re-qualification cycle outside the annual cadence. Tie the trigger criteria to the prequalification questionnaire so re-screening is fast.
Define ahead of time what disqualifies a sub from future work: EMR above threshold, repeated safety failures, missed financial covenants, two consecutive failed projects. Documented exit criteria protect the program from one-off exceptions that erode standards over time.
Trueleveler ships a Vendor Prequalification tracker. Every vendor in your database carries a current assessment, scored against seven weighted criteria, with a portfolio view that answers the only question that matters at bid time: who is actually cleared to bid this package.
Financial stability (20), insurance adequacy (15), bonding capacity (15), safety record / EMR (15), references (15), licensing (10), current capacity (10). Insurance and licensing are gating — fail either and the recommendation is a fail regardless of the total.
The score renormalizes over the criteria you have evidence for, and a separate coverage percentage tells you how much of the package is complete — so a half-finished file reads as low confidence rather than as a low score.
Upload a balance sheet or income statement and the AI extracts the figures and pre-fills a suggested financial-stability rating. It is marked as auto-sourced and never finalizes itself — and because it can never emit a hard fail, a bad extraction cannot silently disqualify a sub.
Insurance pulls from the COI tracker, bonding from the Bonds tracker, licensing from the vendor record. Prequal status shows on the vendor itself, so the bid list and the vendor database stay in step.
Prequalification scores are decision support, not a guarantee. They summarize the criteria and evidence you entered or that were auto-filled from your records — they do not certify a subcontractor’s solvency, safety, or fitness for a specific scope.
Subcontractor prequalification is the systematic vetting process general contractors use to verify a subcontractor’s qualifications before allowing them to bid on a project. It typically covers insurance coverage, bonding capacity, safety record, financial stability, licensing, and relevant project experience. The point of a prequalified bid list is to catch insurance, bonding, licensing, and safety problems before a vendor is invited to bid, rather than after an award has been made.
Standard subcontractor insurance requirements include general liability (typically $1M per occurrence / $2M aggregate minimum), automobile liability, workers’ compensation per state law, umbrella or excess liability ($2M–$10M depending on scope), and professional liability for design-build subs. Verify policy limits, expiration dates, and additional insured endorsements.
An Experience Modification Rate (EMR) of 1.0 is the industry baseline. Below 1.0 indicates better-than-average safety performance; above 1.0 indicates worse. Most GCs require subcontractors to have an EMR of 1.0 or below for project work, with stricter thresholds (0.85 or below) on high-risk projects. EMRs above 1.25 typically disqualify a sub from bidding.
Annual full requalification is standard for all active subcontractors. Insurance certificates should be tracked continuously with automated expiration alerts (most COIs are renewed annually). Trigger-based re-qualification is also recommended after any major event: safety incident, financial distress (lien claim, bankruptcy filing), key personnel departure, or significant performance failure.
A typical prequalification package includes: a completed prequalification questionnaire, certificates of insurance with required limits, a bonding capacity letter from the surety, three years of safety records (EMR letter, OSHA 300 logs, written safety program), three years of financial statements (CPA-prepared preferred), state and trade licenses, three project references with contact details, and a W-9 for tax compliance. That is the same package the annual re-qualification cycle in § 07 re-collects.
Track sub COIs, EMRs, financials, and trade fit in one place. Auto-flag expiring coverage. Build prequalified bid lists in minutes, not days.