When contractors ask "what insurance do I need?", the honest answer is: it depends on who's asking. California contractors face three separate and overlapping sets of insurance requirements — what state law mandates, what the CSLB requires to maintain your license, and what individual GCs and project owners require in their subcontracts. Understanding all three prevents the frustrating experience of showing up to a job site only to have your certificate rejected because it's missing an endorsement.
The Three Layers of Requirements
Think of contractor insurance requirements in California as three concentric circles:
- State legal requirements: What California law mandates for all contractors, regardless of what contracts say.
- CSLB license requirements: What the Contractors State License Board requires to issue and maintain your contractor's license.
- Contract requirements: What individual GCs, project owners, and public agencies require in subcontracts and permit applications.
You must comply with all three simultaneously. Meeting only the legal minimums will not satisfy most GC contracts. And meeting a GC's requirements does not necessarily mean your CSLB license is in good standing. Let's go through each layer.
Layer 1: California State Legal Requirements
Under California law, contractors are required to maintain:
Workers Compensation (CA Labor Code Section 3700)
Mandatory for any contractor with one or more employees. There is no threshold — the first employee triggers the requirement. Sole proprietors with no employees may file an exemption with the CSLB. See our complete guide to California workers comp requirements for contractors for full details on class codes, rates, and penalties.
Commercial Auto Liability
California law (Vehicle Code 16020) requires all registered vehicles to carry minimum liability limits. For vehicles used in business, a personal auto policy often excludes business use — meaning a commercial auto policy is required to actually provide coverage during work-related driving. The minimum required by law ($15,000/$30,000) is far below what GC contracts typically require ($1,000,000 CSL).
No General Liability Mandate Under State Law
California does not have a state law requiring contractors to carry general liability insurance. However, this doesn't mean you can operate without it — GC contracts, permit requirements, and simple business risk make GL effectively mandatory for anyone doing commercial work.
Layer 2: CSLB Requirements
The Contractors State License Board (CSLB) has its own set of requirements that must be met to obtain and maintain an active contractor's license:
Contractor License Bond — $25,000 (B&P Code 7071.6)
Every CSLB licensee must maintain a $25,000 surety bond at all times. If the bond lapses, the license is automatically suspended. As of January 1, 2023, the bond amount increased from $15,000 to $25,000. See our complete CSLB license bond guide for details.
Workers Comp or Exemption (B&P Code 7125)
The CSLB requires every licensee to either (a) maintain active workers comp coverage, or (b) file a Workers' Compensation Exemption Certificate (CSLB Form 3067) declaring that they have no employees. When you apply for or renew your CSLB license, you must certify compliance with this requirement. Filing a false exemption is a misdemeanor.
Home Improvement Requirements
Contractors doing home improvement work (defined broadly under B&P Code 7151) must comply with additional requirements including written contract requirements, a $1,000 or 10% deposit limit for jobs over $500, and mandatory inclusion of specific contract language about lien rights. While not strictly an insurance requirement, home improvement contractors also face additional bond exposure through the Home Improvement Salesperson (HIS) bond for their sales staff.
Layer 3: Contract Requirements from GCs and Project Owners
This is where most of the day-to-day complexity lives. When you sign a subcontract with a GC, or a direct contract with a property owner or public agency, the contract typically specifies detailed insurance requirements that often exceed state minimums significantly.
Typical Private Commercial Subcontract Requirements
A standard California subcontract on a commercial project typically requires:
- General Liability: $1,000,000 per occurrence / $2,000,000 aggregate minimum; higher-value projects may require $2M/$4M
- Products/Completed Operations: Often specified separately as $2,000,000 aggregate
- Commercial Auto: $1,000,000 combined single limit (CSL)
- Workers Comp: Statutory limits / Employers Liability at $1,000,000 per occurrence
- Umbrella/Excess: Increasingly common at $2,000,000 – $5,000,000 on larger projects
Common Endorsements and Special Requirements
Beyond the coverage types and limits, subcontracts almost universally require specific policy endorsements:
Additional Insured Status
The additional insured requirement is the one that generates the most questions and certificate rejections. When you add someone as an additional insured on your GL policy, you are giving them direct rights under your policy — the ability to make claims directly against your insurer for losses arising from your operations.
Most GC contracts require two separate additional insured endorsements:
- Ongoing Operations: Covers the GC/owner for claims arising from your active work on the project
- Completed Operations: Covers the GC/owner for claims that arise after your work is finished (construction defect claims, water damage, etc.) — often must be maintained for 2–10 years post-project
On ISO forms, the most common additional insured endorsements are CG 20 10 (ongoing ops) and CG 20 37 (completed ops). When a GC's contract requires "additional insured on a per-project basis," they usually want both.
Primary and Non-Contributory (P&NC)
Without a primary and non-contributory endorsement, if both you and the GC have GL coverage and a claim arises from your work, the two carriers may share the claim proportionally. The GC doesn't want their policy touched — their rates and loss history matter to them. Primary and non-contributory language means your policy pays first, and the GC's policy does not contribute regardless of what it says.
This endorsement should be evidenced on your certificate of insurance. Without it, even if your carrier would informally treat the claim as primary, the GC's contract requirement is not technically satisfied.
Waiver of Subrogation
Subrogation is the right of your insurance carrier to "step into your shoes" and sue a third party who contributed to a loss. If your carrier pays a claim, they may want to recover that payment from the GC or owner if their negligence contributed to the loss.
A waiver of subrogation endorsement in favor of the GC/owner prevents your carrier from doing this. GCs require it because they don't want to be sued by your insurance company even after a claim is resolved.
Certificate of Insurance (COI) tip: When you request a certificate from your broker, provide them with the actual subcontract insurance exhibit — not just a verbal description. The specific additional insured form numbers, wording for P&NC, and exact policy limit requirements matter. A certificate issued without the correct endorsements will be rejected, and you'll lose time on rebidding or project start.
City and County Permit Requirements
Beyond state law and contract requirements, many California cities and counties require proof of insurance before issuing building permits. This varies significantly by jurisdiction:
- Los Angeles: Requires proof of general liability and workers comp (or exemption) before issuing contractor permits
- San Diego: Requires current GL and WC certificates for contractor license applications and renewals
- San Francisco: Has specific minimum GL requirements for permitted work
- Most other CA cities: Vary — check local requirements before applying for permits
The limit requirements at the permit level are often lower than what GC contracts require — but you still need to have the policy in place to get the certificate, so it rarely matters in practice.
Public Works Requirements
Public works projects in California carry additional requirements beyond private commercial work:
- Prevailing wage: Public works over $25,000 ($15,000 for maintenance) require prevailing wage payment — which affects your workers comp class code rates since prevailing wage rates are higher
- Certified payroll: Weekly certified payroll reports must be submitted
- DIR registration: All contractors and subcontractors must be registered with the California Department of Industrial Relations (DIR) to work on public projects — costs $450/year
- Higher GL limits: Public agencies often require $2M/$4M GL, $2M auto, and substantial umbrella limits
Why "Licensed and Insured" Matters for Marketing
Homeowners who hire unlicensed contractors take on significant personal risk. Under California law, an unlicensed contractor cannot enforce a contract in court — which effectively means a homeowner can legally refuse to pay them. More importantly, when a homeowner hires an unlicensed contractor, the homeowner may be treated as the employer of that contractor's workers — creating potential liability for their workers comp obligations.
This is why "licensed and insured" is genuinely meaningful marketing language, not just a cliche. A licensed, bonded, and insured contractor provides documented protection that an unlicensed competitor cannot. Leverage this in your marketing — your CSLB license number and insurance coverage protect your customers as much as they protect you.
How to Read a Subcontract Insurance Exhibit
When you receive a subcontract with an insurance exhibit (often called Exhibit B or similar), here's how to evaluate it quickly:
- Check the limits: Compare GL, auto, WC/EL, and umbrella requirements against your current policy limits.
- Check for additional insured requirements: Note who needs to be named (GC, owner, project lender, architect?) and whether ongoing and/or completed operations are specified.
- Check for P&NC: Look for "primary and non-contributory" language.
- Check for waiver of subrogation: Often phrased as "Subcontractor shall cause its insurer to waive all rights of subrogation…"
- Check for notice requirements: Many contracts require 30-day notice of cancellation — standard policies provide 10 days for non-payment, 30 days for other cancellation. Make sure your policy matches.
- Send the exhibit to your broker: Don't try to verify compliance yourself. Send us the exhibit and we'll confirm whether your current policies satisfy it and obtain any missing endorsements.
We respond to certificate requests and endorsement needs same-day for active clients. If you're bidding a new project and need to verify your policy satisfies a subcontract, call us at (858) 367-0782 or email the exhibit and we'll turn it around quickly.