A bad sub does not just cost you money, they cost you schedule, reputation, and sleep. Prequalification is your first line of defense, and it is far cheaper than the back charges and liens that follow a bad hire.
Subcontractor prequalification is the process of evaluating a subcontractor's ability to perform work before inviting them to bid. It is not paperwork for paperwork's sake, it is about avoiding the sub who underbids by 20%, shows up with an inexperienced crew, falls behind schedule, and files a lien when you back charge them for deficient work. A structured prequalification catches that sub before they ever set foot on your project.
On commercial work, prequalification is usually done annually for the active sub pool, and again for any new sub requesting to bid. The output is a tiered list: approved, approved with conditions, or not approved. That list drives who gets invited to bid and who does not.
The 3 C's of Subcontractor Evaluation
Capacity: Can they physically do the work? Do they have the workforce, equipment, and bandwidth given their current project load? A sub running five projects simultaneously may not staff yours properly. Ask for their current backlog, their committed work over the next six months, and the size of their typical crew. A $5 million sub stretched across five jobs is not the same as a $5 million sub with one job.
Capital: Can they finance the work? Construction subs typically carry 45 to 60 days of payroll and material costs before receiving payment. Do they have the financial resources to carry that float? Check bonding capacity, it is a useful proxy for financial health because sureties underwrite it. A sub with no bonding capacity is not necessarily a bad sub, but they are a sub you will be financing more closely.
Character: Will they do what they say? References, litigation history, safety record, and payment history tell you whether they deliver on promises. One conversation with a sub's last three GCs tells you more than any questionnaire. Ask the references directly: would you hire them again, did they finish on time, were there any liens, and how did they handle change orders.
The Prequalification Checklist
A complete prequalification collects the same documents from every sub so you can compare them on a level field. The checklist below is the minimum most commercial GCs require before a new sub is approved to bid.
- Business profile: Legal name, entity type, EIN, years in business, license numbers, and states where licensed.
- Financial statements: Two years of reviewed or audited financials, plus current bank and trade references. A sub who will not share financials is a sub who cannot carry your float.
- Bonding capacity: Single and aggregate bonding limits, surety name, and bond agent contact. Confirm the surety will write bonds for your project size.
- Insurance certificates: General liability, workers comp, auto, and umbrella limits. Confirm the GC is named as additional insured and that the policy covers the project duration.
- Safety record: Three years of OSHA logs, your EMR, and any serious citations. A sub with a poor safety record drives your experience modifier and your risk.
- Litigation and lien history: Disclose any pending or settled lawsuits and any liens filed in the last five years. Patterns matter more than single events.
- References: Three GC references for similar work and similar project size in the last 24 months. Call all three.
- Project backlog: Current committed work, expected start and end dates, and remaining capacity for the next six months.
Red Flags That Should Stop a Prequalification
Some signals disqualify a sub immediately. A sub whose financials show declining revenue and negative working capital for two straight years is a liquidity risk. A sub whose license has lapsed or is suspended in your state cannot legally contract. A sub with an EMR above 1.5 is dragging your insurance and your safety culture. A sub who cannot produce three references for comparable work probably has not done comparable work.
Other signals are warnings rather than disqualifiers, but they demand a closer look. Rapid growth beyond a sub's historical capacity often outpaces their management systems. A recent change in ownership or key personnel can reset a sub's reliability. A single large project dominating their backlog concentrates their risk, if that job goes sideways, yours gets deprioritized. Use the prequalification to ask the questions, then use your judgment.
Annual Review and Field Feedback
Prequalification is not a one time exercise. Revisit your approved list annually with updated financials, refreshed insurance certificates, and current bonding letters. More importantly, fold field feedback back into the file. A sub who passed prequalification but delivered late, over budget, or with quality issues on your last job should be downgraded or removed before the next bid cycle.
Keep a simple performance scorecard per sub: on time, on budget, quality of work, safety, and paperwork. A sub who scores well gets more work and better terms. A sub who scores poorly gets one warning, then comes off the list. The prequalification process only works if you act on what it tells you.