Residential roofers eyeing their first $1M commercial project often discover that their current insurance program is fundamentally inadequate. The general contractor's contract requirements read like a foreign language — CG 20 10, primary and non-contributory, waiver of subrogation, $5M umbrella minimum. This is the insurance gap that stops otherwise capable contractors from winning commercial work, and closing it requires planning that starts months before bid day.
Typical Insurance Requirements in a $1M+ Commercial Contract
Commercial general contractors and property owners have standardized insurance requirements that reflect their risk transfer strategy. As a roofing subcontractor, you must meet every line item or you won't get on the job.
A typical $1M commercial roofing subcontract requires:
- Commercial General Liability: $1M per occurrence / $2M general aggregate, with completed operations coverage included
- Automobile Liability: $1M combined single limit
- Workers Compensation: Statutory limits with $1M employers liability
- Umbrella/Excess Liability: $2M-$5M (varies by GC and project size)
- Additional Insured status for the GC, owner, and sometimes the architect
- Primary and Non-Contributory endorsement
- Waiver of Subrogation on GL and Workers Comp
- Per-Project Aggregate endorsement (sometimes)
These aren't negotiable. The GC's risk manager will reject your COI if any element is missing, and you'll lose the bid to a competitor who was already prepared.
General Liability Limits and Additional Insured Requirements
Your residential GL policy at $1M/$2M limits might meet the minimum, but the endorsement requirements are where residential policies typically fall short.
Additional Insured Endorsements: CG 20 10 and CG 20 37
Commercial contracts require you to add the GC and owner as additional insureds on your GL policy. The standard endorsements are ISO forms CG 20 10 (additional insured — owners, lessees, or contractors, scheduled or blanket, for ongoing operations) and CG 20 37 (additional insured for completed operations). Together, these extend your GL coverage to protect the GC and owner for claims arising from your work — both during the project and after completion.
Many residential GL policies either don't offer these endorsements or use non-standard "additional insured" language that sophisticated GCs will reject. Your policy needs to provide ISO-equivalent additional insured coverage, or you need to switch to a commercial contractor program that does.
Primary and Non-Contributory
This endorsement (ISO CG 20 01 or equivalent blanket language) ensures your policy pays first before the additional insured's own policy contributes. Without it, the GC's carrier could demand your carrier share defense costs proportionally — which the GC's contract prohibits. This endorsement is standard on commercial contractor GL programs but often absent from residential-focused policies.
Per-Project Aggregate
Standard GL policies have a single $2M general aggregate that applies across all your projects for the policy year. A per-project aggregate endorsement gives each project its own $2M aggregate, ensuring that claims on another project don't erode available limits for this one. Larger GCs and owners increasingly require this, especially on projects over $1M.
Workers Comp, Umbrella, and Professional Requirements
Workers Compensation
Workers compensation at statutory limits is non-negotiable for commercial work. Beyond the base coverage, commercial contracts require:
- Employers Liability limits of $1M/$1M/$1M (each accident / disease-policy limit / disease-each employee)
- Waiver of Subrogation endorsement in favor of the GC and owner
- All States coverage if you might work across state lines
If you're currently using a PEO or employee leasing arrangement for workers comp, verify that the PEO's policy will provide the required endorsements. Many cannot, which forces you to obtain a standalone workers comp policy for commercial work.
Umbrella/Excess Liability
This is where the premium increase hits hardest. Residential roofers often carry $1M umbrella policies or none at all. Commercial contracts at the $1M level typically require $2M-$5M umbrella limits. The umbrella must follow form over your GL, auto, and employers liability, and must extend additional insured status to the same parties as the underlying GL.
Umbrella pricing for roofing contractors typically runs $3,000-$8,000 per million depending on your revenue, loss history, and the specific operations. Moving from no umbrella to a $3M umbrella might add $12,000-$20,000 to your annual insurance costs.
Professional Liability
On design-build commercial roofing projects or when you're providing system specifications, some contracts require professional liability (errors and omissions) coverage. This covers claims arising from your design recommendations — specifying the wrong membrane system, inadequate drainage design, or incorrect R-value calculations. Limits of $1M are typical, with annual premiums of $3,000-$8,000 for roofing-specific E&O.
Builders Risk and Installation Floater Requirements
Builders Risk
On new construction, the GC or owner typically procures the builders risk policy covering the structure during construction. As a sub, you're generally included as an insured on that policy. However, some contracts require you to carry your own builders risk for your scope of work, or to provide an installation floater covering your materials and installed work until project acceptance.
Installation Floater
An installation floater covers your materials — membrane, insulation, metal panels, fasteners — from your warehouse through installation until the project is accepted. On a $1M roofing sub, your materials might represent $400,000-$600,000 in value. If a storm destroys installed-but-not-accepted roofing materials, who pays to replace them? Without an installation floater, you bear that loss. Coverage typically costs 0.5%-1.5% of the covered value annually.
Understanding the Gap
The critical question is: what happens to your installed work before the GC accepts it? If the builders risk policy has a sublimit for roofing materials, or if it excludes work by subs until a certain milestone, your installation floater fills that gap. Read the GC's builders risk certificate carefully to understand what's actually covered.
Timeline for Getting These Coverages in Place
This is where contractors get burned. You cannot get commercial insurance program changes done in 48 hours. Plan ahead.
90 Days Before Bidding
Contact a commercial roofing insurance specialist and explain your plans. They'll need your current loss runs, financial statements, project history, and the target contract requirements. Starting early gives you time to shop markets and obtain competitive pricing.
60 Days Before Bidding
Your agent should have quotes from commercial contractor markets. Review the proposed policy forms to ensure they'll satisfy contract requirements. Confirm that additional insured endorsements, waiver of subrogation, and primary/non-contributory language are all available.
30 Days Before Bidding
Bind the new coverage so you can submit a compliant COI with your bid. Some GCs require proof of insurance at bid submission, not just at contract signing. Having your program in place demonstrates readiness and professionalism.
Why Waiting Kills Deals
If you win a bid and then scramble to get insurance in place, you'll face rush fees, limited market options, and potential gaps. Worse, if you can't get the required coverage at all, you'll have to decline the contract — damaging your reputation with the GC and potentially facing bid bond forfeiture on public projects.
What It Actually Costs to Step Up
The premium increase from a basic residential insurance program to a commercial-ready program varies by state and contractor profile, but here are realistic ranges:
- GL premium increase: 20%-50% more than residential-only rating, primarily due to commercial classifications carrying higher rates ($15-$40+ per $1,000 of receipts vs. $8-$20 for residential)
- Umbrella addition ($2M-$3M): $8,000-$20,000 annually for a roofing contractor
- Workers comp adjustment: Minimal change in base rate, but commercial work at heights may trigger higher classification codes
- Installation floater: $2,000-$6,000 annually depending on values
- Auto increase: Minimal if you already carry $1M CSL
Total additional annual premium for a commercial-ready program: $15,000-$40,000 beyond your current residential program. On a $1M contract with typical roofing margins of 15%-25%, insurance costs represent 1.5%-4% of the contract value — a line item that should be built into your bid.
Planning the Insurance Upgrade Before Pursuing Commercial Work
The contractors who successfully transition into commercial work treat insurance as a pre-qualification requirement, not an afterthought. They engage specialist agents months before their first commercial bid, understand the cost implications, and build those costs into their pricing model. The investment in a commercial-grade insurance program pays for itself on the first project and positions you for growth into larger contracts with more demanding requirements. Start the conversation with a roofing-focused commercial insurance agent today, and you'll be bid-ready when the right opportunity arrives.