Every contractor who uses subs knows the drill: you collect a certificate of insurance when a sub starts, it goes in a folder, and eighteen months later an auditor asks for it — and half the certificates in the folder expired last spring. Sub compliance is unglamorous work, but it directly protects your premium, your policy, and your standing with the GCs above you. Here’s the why and the how.
Why uninsured subs become your problem
At your Workers’ Comp audit. California’s rule of thumb is blunt: if a sub is unlicensed or can’t show their own Workers’ Comp, their people are treated as your employees for the audit period. Their payroll gets added to yours, at their class code rates, and your premium is recalculated accordingly. One uninsured framing sub can erase the entire savings you thought you were getting by subbing the work out.
At your General Liability audit and renewal. GL carriers ask what percentage of your work is subcontracted and whether you collect certificates. Uninsured subcontractor exposure is priced into your policy — poor certificate discipline means higher rates, and in a claim, a sub with no coverage means the injured party comes looking for the next insured party up the chain: you.
In your contracts. The insurance requirements your GC puts on you almost always flow down: you’re required to hold your subs to the same standards. If your sub causes a loss and has no coverage, you can be in breach of your own contract on top of everything else.
What to collect from every sub — before day one
- A current COI showing General Liability (the $1M/$2M standard) and Workers’ Comp with employer’s liability
- Additional insured endorsement naming your company, for ongoing and completed operations — the certificate alone isn’t the coverage
- Waiver of subrogation on GL and Workers’ Comp where your contract requires it
- Their CSLB license number — verify it’s active and matches the trade they’re performing
- A signed subcontract with your insurance requirements spelled out, so there’s no argument later
The phrase “before day one” is doing the heavy lifting. Once a sub is on site and mid-scope, your leverage is gone. Make the paperwork a condition of mobilization, not a follow-up.
The part that falls apart: expirations
Collecting certificates once is easy. The failure mode is time: every sub’s policies renew on a different date, certificates expire quietly, and nobody emails you when a sub lets their Workers’ Comp lapse in February. A folder of PDFs can’t warn you.
The fix is a system with three properties:
- One place for every sub’s documents — not scattered across inboxes and truck cabs
- Expiration dates tracked automatically, with reminders before — not after — a certificate lapses
- Audit-ready output — when the auditor asks, you produce the whole package in minutes, which itself keeps the audit moving in your favor
You can build this with a spreadsheet and calendar reminders if you have the discipline. Our clients get it built in: the Insureaze client portal tracks your subs’ certificates and expiration dates alongside your own policies, so audit season is a download instead of a scramble.
The payoff
Tight sub compliance isn’t just defensive. GCs notice subs-of-subs paperwork handled cleanly, auditors close files faster, and your renewal pricing reflects a contractor who manages risk instead of absorbing everyone else’s. It’s one of the few pieces of insurance admin that pays you back directly.