What contractor insurance costs
Checked 2026-09-04 · 8 min read
§ 1The six lines
“What does contractor insurance cost?” has no single answer because it is not one product. A working programme is six separate purchases, each priced on a different basis, and only one of them is optional for most contractors.
| Line | What it answers | Priced on |
|---|---|---|
| General liability | Third-party injury and property damage | Receipts, payroll, class of work |
| Workers' compensation | Injury to your own people | Payroll ÷ 100 × class rate × e-mod |
| Commercial auto | Vehicles and what they hit | Units, drivers, radius, driving records |
| Tools and equipment | Your own kit | Scheduled value |
| Builders risk | The project under construction | Completed value, term, deductible |
| Surety bond | Your promise to the board or owner | Credit, then capital and capacity |
An umbrella policy sits above several of these when a contract demands limits higher than the underlying policies carry. It is priced off the underlying programme, so it is usually the last piece bought, not the first.
§ 2What drives each one
Each line has one dominant input. Knowing which is which is how you read a quote instead of simply receiving it.
- General liability — class of work. Roofing, excavation and anything structural sit well above interior finish trades.
- Workers’ comp — the e-mod. Same payroll, same codes, and a 0.85 versus a 1.35 e-mod is a different business.
- Commercial auto — driving records. One bad motor vehicle record can outweigh the vehicles themselves.
- Builders risk — completed value and construction type. Frame construction is materially dearer than masonry or steel.
- Bond — personal credit. On a statutory licence bond it is close to the only input that moves.
§ 3Why quotes diverge
Two brokers quoting the same contractor can be a long way apart, and it usually is not margin. Four causes account for nearly all of it.
Compare the inputs, not the totals
- Different class codes. One broker classified you as general remodeling, the other as roofing.
- Different limits. A $1M/$2M and a $2M/$4M are not the same product.
- Different exclusions. The cheaper quote may carve out the very work you do most.
- Admitted versus surplus lines. Different markets, different regulatory protection, different price.
This is where the statutory floors matter as a sanity check. If you licence an LLC in California, a quote whose limit sits below $1,000,000 cumulative cannot satisfy the board no matter how attractive the premium is.
§ 4The levers you control
Three of them are real, and they compound over years rather than at renewal.
- § 1Claim frequency. The e-mod is frequency-weighted. Reporting and closing small claims fast beats arguing about big ones.
- § 2Records. Payroll split by class code, and a certificate on file for every sub. Both are pure premium, recovered at audit.
- § 3Personal credit. The bond line responds to it directly, and it is the one input a contractor can genuinely improve inside a year.
Put numbers on your own case with the GL calculator, workers’ comp calculator and the bond calculator before you take the first quote to market.
Checked against
- CSLB — Bond Requirements (SB 607, effective 2023-01-01)read 2026-09-04
- CSLB — Limited Liability Company (LLC) licencesread 2026-09-04
Not legal advice. Fees, bond amounts and deadlines are set by statute and change without notice — confirm with the board that issues your licence before you file.