Builders risk insurance exists primarily for new construction, but commercial reroofing projects occupy an uncomfortable middle ground. You're not building a new structure, but you're exposing an existing structure to significant risk during the tear-off and replacement process. Whether builders risk applies — and who should purchase it — depends on contract language, project scope, and the gap between the building owner's property policy and the roofing contractor's GL coverage.
When Builders Risk Applies to a Reroof Project
Builders risk isn't automatically required on every commercial reroof. The trigger conditions that make it relevant include:
Scope and value thresholds. Most insurance professionals recommend builders risk when the reroof project value exceeds $250,000-$500,000. Below that threshold, the existing property policy and contractor's coverage typically provide adequate protection. Above it, the gap becomes financially significant.
Open-structure exposure. When a reroof requires full tear-off — particularly on large commercial structures where the deck will be exposed over multiple days or weeks — the building interior is exposed to weather damage. A standard property policy may exclude or limit coverage for damage caused by work being performed on the building. This exposure gap is what builders risk addresses.
Extended project duration. A single-day residential shingle overlay doesn't need builders risk. A 12-week phased TPO replacement on a 200,000 SF warehouse does. Duration correlates with exposure — the longer the building is in a partially-roofed state, the greater the risk of a weather event causing interior damage.
Valuable building contents. If the building houses sensitive equipment, inventory, or operations that would suffer catastrophic loss from water intrusion, builders risk becomes essential regardless of project size. A $150,000 reroof over a $5M data center is a builders risk situation.
Contract requirements. Many commercial property owners and their lenders require builders risk on any roof replacement, regardless of size. This is particularly common with institutional owners, REITs, and government entities.
Who Is Responsible for Purchasing the Policy
This is where most confusion — and most disputes — originate. There's no default legal rule. Responsibility is determined entirely by the contract between the building owner and the roofing contractor.
Owner-purchased (most common on large projects): On projects over $500K, the building owner typically purchases builders risk. This makes sense because:
- The owner has the insurable interest in the existing structure
- The owner's existing property insurer often offers a builders risk endorsement at favorable rates
- The policy can be structured to cover the owner's property (building and contents) as well as the contractor's work and materials
- It avoids coverage disputes between the contractor's policy and the owner's property policy
Contractor-purchased (common on mid-size projects): On projects between $100K-$500K, the contract often requires the roofing contractor to provide builders risk. This shifts the cost and administrative burden to the contractor, who includes it in their bid. The challenge: most roofers don't carry annual builders risk policies and must obtain project-specific coverage, adding 1-3% to project cost.
The contract language matters enormously. Look for these provisions:
- "Contractor shall provide builders risk insurance covering the full value of the work" — contractor buys it
- "Owner shall maintain property insurance including coverage for work in progress" — owner buys it
- "The party responsible for loss to the existing structure during construction..." — this is where waiver of subrogation clauses become critical
If the contract is silent on builders risk, you have a dangerous gap. Both parties assume the other is covering it. Clarify this before signing the contract, not after a storm floods the building through an open deck.
What a Builders Risk Policy Covers on a Reroof
A properly structured builders risk policy for a commercial reroof covers:
- Materials on-site: Roofing materials delivered and staged, including membrane, insulation, fasteners, sheet metal, and adhesives
- Materials in transit: Coverage while materials are being delivered to the jobsite (overlaps with an installation floater)
- Work in progress: The partially-completed new roof system — materials that have been installed but the project isn't complete
- Existing structure damage during construction: Interior water damage from weather events entering through the open roof during tear-off
- Temporary structures: Scaffolding, temporary weather protection, hoisting equipment attached to the building
- Soft costs: Extended project costs if a covered loss delays completion — additional supervision, extended equipment rental, potential liquidated damages
Covered perils typically include fire, windstorm, hail, theft, vandalism, vehicle impact, and weight of ice/snow. Named storm coverage is available but costs significantly more in coastal and hurricane-prone regions.
Common Exclusions That Catch Roofers Off Guard
Builders risk policies on reroofs contain several exclusions that create problems when contractors don't read the fine print:
Faulty workmanship exclusion. If your crew installs membrane incorrectly, and water intrusion damages the building interior, builders risk won't cover the damage. This exclusion applies to defective work product — the policy covers fortuitous events, not contractor errors. This is where your general liability policy and potentially your professional liability coverage become relevant.
Existing conditions exclusion. Damage to the existing structure that predates the project start isn't covered. If the building already had hidden water damage or structural deterioration, builders risk won't pay for it — even if your tear-off reveals it.
Weather protection responsibility. Most policies require the contractor to take reasonable steps to protect the open structure from weather. If weather is forecast and you leave 10,000 SF of open deck unprotected overnight, the carrier may deny a resulting water damage claim as failure to mitigate. Document your weather protection measures daily.
Theft exclusions for unsecured jobsites. Some policies limit or exclude theft coverage unless the jobsite meets minimum security requirements — fencing, locked storage, lighting. Know your policy's security requirements before a $30,000 copper theft occurs.
Mechanical breakdown of equipment. Your crane or hoist breaks down mid-project — that's not a builders risk claim. Equipment breakdown requires separate coverage.
Cost and Duration Considerations
Project-specific vs. annual policies: Most roofing contractors who occasionally need builders risk purchase project-specific policies. These are issued for a defined project term (typically the contract duration plus 30-60 days) and cover only that project. Annual builders risk policies make sense if you consistently have 5+ active projects requiring coverage.
Cost factors:
- Project value: The primary rating factor — typically 1-4% of total project value for a reroof
- Construction type: Non-combustible structures cost less to insure than wood-frame
- Location: Coastal and hail-prone areas cost 2-3x more than low-hazard regions
- Duration: Longer projects cost more due to extended exposure
- Deductible: Typical deductibles range from $5,000-$25,000; higher deductibles reduce premium 15-25%
A $1M commercial TPO reroof in Dallas might carry a builders risk premium of $12,000-$20,000 for a 90-day project term. The same project in Miami could run $25,000-$40,000 due to hurricane exposure.
Clarifying Responsibility Before the Project Starts
The single most important action on builders risk is resolving responsibility before the contract is signed. Add builders risk as a line item in your bid if you're purchasing it — don't bury it in overhead where it gets value-engineered out. If the owner is purchasing it, get the certificate of insurance before mobilizing. Confirm the policy names you as an additional insured and includes a waiver of subrogation in your favor. Never assume the other party has it handled. The time to discover a builders risk gap is during contract negotiation, not when you're staring at $200,000 in water damage to a building interior after a thunderstorm rolled through your open deck at 2 AM.