A subcontractor’s bad weld starts a fire six months later. The finished interior burns. The base builders risk policy excludes defective workmanship, the owner did not add LEG 3, and the carrier denies the loss. That is the kind of mistake endorsements exist to prevent.
A builders risk policy’s standard form covers core perils. Most projects need additional endorsements to address specific risks. The most-requested add-ons are LEG 3 (defective work), soft costs, delay in opening, hot work, ordinance or law, theft of materials off-site, earth movement, and flood. The right combination depends on project type, location, and lender requirements.
BuildersRiskNerd shops builders risk for residential and commercial projects in all 50 states, through admitted and non-admitted carriers. We see which endorsements get quoted, declined, and required by underwriters every week. BuildersRiskNerd is a brand of ContractorNerd Insurance Services, LLC, a licensed insurance producer (CA License #6015566). For the broader explainer, see our complete guide to builders risk insurance.
Where the base form falls short
The base policy is conservative on purpose. ISO form CP 00 20 (and the carrier proprietary forms modeled after it) covers fire, lightning, theft, vandalism, wind, hail, falling objects, accidental water discharge, and explosion. That is roughly the floor.
The base form leaves out the exposures that show up most often on real projects. Defective workmanship sits outside the form. So does earth movement. So does flood. Soft costs and lost rents are categories of financial loss the carrier prices separately, by endorsement, when you ask for them.
The exclusions are not carrier overreach. They reflect what the underwriter cannot price without specific information. A flood loss in a coastal Florida ZIP looks nothing like a flood loss in inland Pennsylvania, so flood gets quoted as its own coverage. Earthquake gets the same treatment in California. Defective workmanship is a contractor-quality question, so LEG clauses sit on top of the base form rather than inside it.
Endorsements close the gap between what the base form covers and what your specific project needs. Skip the wrong one and the lender bounces the certificate. Skip a different wrong one and a fire claim pays for the structure but not for six months of construction-loan interest you still owe the bank.
This page walks the eight most-requested endorsements, the ones specific to renovation work, the ones high-value projects need, and how the BuildersRiskNerd quote flow handles them.
The eight endorsements GCs request most
Premium impact at a glance:
| Endorsement | Typical premium impact |
| LEG 3 | 5-15% on commercial |
| Soft costs | 5-10% |
| Delay in opening | 5-15% |
| Hot work | 1-3% |
| Ordinance or law | 3-8% |
| Theft of materials off-site | 2-5% |
| Earth movement | 25-50% in high zones |
| Flood | $1,000-$50,000+ depending on zone |
LEG 3 (defective workmanship coverage)
LEG 3 is a London Engineering Group clause that addresses defective design, materials, or workmanship. There are three LEG clauses in common use. LEG 1 is the narrowest and excludes nearly all consequential damage. LEG 2 sits in the middle. LEG 3 is the broadest. It covers damage to the otherwise sound parts of the project caused by defective work, and excludes only the cost to redo the defective work itself.
The need is simple. A subcontractor welds a steel connection wrong, a fire starts months later, and finished interior work burns. With LEG 3, the carrier pays for the burned interior and excludes only the cost to redo the bad weld. Without it, the entire loss can be denied as flowing from defective work.
Premium impact runs 5 to 15 percent on top of the base premium for commercial projects. Less common on residential. Lenders on multifamily and mixed-use commercial regularly require LEG 3 in their insurance schedules. Add it on any commercial build, any project with three or more trades stacking on each other, and any custom home where design risk is real.
Soft costs endorsement
Soft costs covers financial expenses you incur when a covered loss extends construction past the planned completion date. Common categories: construction-loan interest, property taxes during the delay, additional architect or engineering fees, advertising, permit and license extensions, and added insurance premium for the extended term.
A fire delays a multifamily project by six months. The building gets rebuilt under base coverage. The owner still owes six months of extra loan interest, six months of property tax, and the architect’s bill for redesign. Soft costs coverage pays those line items. Without it, that money comes out of pocket.
Premium impact is usually 5 to 10 percent of base, with a sub-limit you select at quoting (often $50K, $100K, or $250K depending on project size). On a $500K residential remodel, a $50K soft costs sub-limit typically adds $200 to $500 in premium. Add it on any project with construction financing, any commercial build with leases or sale contracts in place, and any project where professional fees are a meaningful share of total cost.
Delay in opening (lost rents)
This is the income side of the same problem soft costs solves on the expense side. Delay in opening, sometimes called rental income coverage, pays the actual lost business income or rental income when a covered loss pushes the project past its scheduled completion or opening date.
A 40-unit apartment build was scheduled to start collecting rent April 1. A windstorm in February pushed completion to August. The endorsement pays the projected April-through-July rent that was lost during the delay, less any rent actually collected once units came online.
Premium impact runs 5 to 15 percent of base, with the limit set at projected gross rent or business income for the delay period (often a 6 or 12 month indemnity period). Commercial only. Only the named insured with the actual income exposure can collect. Add it on multifamily, retail, office, hotel, or any income-producing project where a delay translates directly into lost cash flow.
Hot work endorsement
Hot work means welding, cutting, soldering, brazing, torching, or grinding. The endorsement clarifies that fire and consequential damage from these operations is covered, often with a reduced or waived deductible specifically for hot work claims.
Hot work causes a disproportionate share of construction fire losses. Roof torch-down on a flat-roof commercial project is the classic scenario. NFPA 51B is the industry standard for hot work safety, and most carriers reference it directly in their endorsement requirements. Some base policies carry hot work sub-limits or higher hot work deductibles, which can leave the contractor short on a fire claim that started with a torch.
Premium impact is small, typically 1 to 3 percent. The carrier will usually require hot work safety controls in exchange: written permits, dedicated fire watch for at least 30 minutes after work stops, fire extinguishers staged within reach, no torch-down within a defined distance of combustibles. Add it on any roofing project, any HVAC or mechanical-heavy build, any steel-frame structure, and most commercial work.
Ordinance or law
Ordinance or law has three sub-coverages. Coverage A pays for the loss of value of the undamaged portion of the structure when code forces you to demolish it. Coverage B pays demolition costs of the undamaged portion. Coverage C pays the increased cost of construction to bring the rebuild up to current code.
The need shows up after partial losses on existing structures. A fire damages 40 percent of an older building. The building department requires the rebuild to comply with current seismic, sprinkler, electrical, or accessibility code. The base policy pays to rebuild what burned. Ordinance or law pays the code-driven extras, including the cost to tear down undamaged portions the code says cannot be left standing.
Premium impact runs 3 to 8 percent depending on the sub-limits selected. Three sub-coverages, three limit elections. Add it on any renovation project, any addition tying into an existing structure, and any project in a jurisdiction with frequent code updates. Most California cities, all of Florida coastal, and most of the I-95 corridor see enough code change to make this a default.
Theft of materials off-site
Base builders risk policies cover theft only at the named project location, and only after materials are delivered. The off-site theft endorsement extends coverage to the contractor yard, the truck, and any temporary storage location.
Most carriers rank theft in the top three loss categories on builders risk. Custom millwork, mechanical equipment, copper, and appliances are the favorite targets. The endorsement carries sub-limits for in-transit and at-storage exposure, set separately from the project-site limit.
Premium impact runs 2 to 5 percent depending on the off-site sub-limit and storage location requirements. A locked yard with cameras gets better terms than open-air staging. Add it on any project with long-lead custom materials, any project in a high-theft market, and any build that requires off-site staging because the site cannot accept full deliveries.
Earth movement and earthquake
Standard builders risk excludes earth movement entirely. The exclusion picks up earthquake, landslide, mudslide, sinkhole, and subsidence. Coverage is added back by endorsement, often as a Difference in Conditions (DIC) layer rather than an inline endorsement, especially for high-zone projects.
The need is geographic. California is the obvious one. Most California construction lenders condition the loan on earthquake coverage being in place at first draw. Other meaningful seismic markets include Oregon, Washington, Utah, Alaska, parts of Nevada, the New Madrid zone in Missouri and Tennessee, and Puerto Rico. Lenders in those areas often drive the requirement.
Premium impact is large. High-zone projects can see 25 to 50 percent on top of base premium, with deductibles set at 10 to 20 percent of total insured value rather than a flat dollar amount. Add it whenever the project sits in a meaningful seismic zone or whenever the lender asks. For state-level detail, see builders risk in California.
Flood
Standard builders risk excludes flood. NFIP (National Flood Insurance Program) is the federal flood program, but NFIP is designed for completed structures, not buildings under construction. Most lenders on construction loans require private flood coverage during the build, then a permanent flood policy at completion.
Federal law requires flood insurance on any project with a federally-backed loan inside a FEMA Special Flood Hazard Area (Zones A, AE, V, VE on the flood maps). Lenders often require it outside SFHAs as well, especially within a half-mile of mapped flood. Pull a FEMA flood determination before you quote so the answer is on the table.
Premium impact is highly variable. A non-coastal project just inside an A zone may add $1,000 to $3,000 in premium. A coastal Florida project in a V zone can add $5,000 to $50,000 or more. For state-level detail, see builders risk in Florida.
Renovation-specific endorsements
Renovation work has a distinct endorsement stack because the existing structure changes the underwriting picture.
The existing structure endorsement covers the value of the original building that the renovation ties into. Most renovation policies need this, and most lenders require it. The limit is set at the existing structure’s replacement value before work began. Without it, only the new work is covered, and a fire that takes both leaves the owner exposed on the existing portion.
The debris removal extension matters because base policies usually cap debris removal at 25 percent of the loss amount. On a gut renovation, demolition debris alone can exceed that cap before any actual loss happens. The extension adds a dedicated debris removal limit so the cap stays available for an actual claim.
The vacant building waiver addresses the fact that most existing structures sit empty during renovation. Most carriers restrict or void coverage after 30 to 60 days of vacancy without an occupant. The waiver keeps the policy in force regardless of vacancy for the policy term. On a 9 to 12 month renovation, that decision controls whether the policy actually responds when something happens.
For project-type-specific guidance, start with our renovation builders risk page.
Endorsements for high-value and complex builds
Higher-value projects (custom homes above $1M, commercial above $5M, multifamily above $10M) benefit from a different endorsement stack.
Agreed-value removes the coinsurance penalty. The insured value is agreed up front between insured and carrier, with no dispute at claim time. On custom homes where exact replacement cost is hard to nail down, this avoids a haircut at the worst possible moment.
Replacement cost vs. ACV election sounds technical but it is a one-line decision. Replacement cost is right for nearly every builders risk situation. ACV (actual cash value) subtracts depreciation, which makes no sense on a structure being built new. Confirm replacement cost is selected on the declarations page.
Scheduled limits apply when a single item exceeds the per-item sub-limit in the base form. Custom doors, art-grade glazing, specialty mechanical equipment, and high-end millwork are common candidates. The item gets listed by description and value on a schedule, and the sub-limit goes away for that item.
Extra-expense coverage pays the cost of expediting repairs or temporary substitute facilities to avoid further loss after a covered claim. On commercial work where the project is racing a lease commencement date, this is the endorsement that funds the overtime crew and the rented temporary structure.
For the cost side of this conversation, see how endorsements affect price. For new construction guidance, see builders risk for new construction.
How to add endorsements before you bind
Through the BuildersRiskNerd quote flow, endorsements are selected with the project info. Premium adjusts in real time as you toggle each one on or off, so you can compare the cost of LEG 3 with and without before deciding. The quote summary lists every endorsement that was added, and the certificate of insurance reflects them automatically once the policy binds.
Three of the eight (LEG 3, earthquake, flood) require additional underwriting questions. The system flags those and routes the submission to a human underwriter when needed. Expect a 24 to 72 hour underwriting turn on those, vs. instant binding on the cleaner endorsements.
Mid-policy endorsements (adding coverage after binding) are processed in 24 to 48 hours through the customer portal. Premium is pro-rated. The carrier reissues the certificate with the new coverage, and the lender, GC, and owner all get the updated copy emailed.
If the project has unusual risk (LEG 3 on a complex build, earthquake on a high-zone California job, flood on a coastal Florida site), tell us up front. We’ll route to the carriers in our book that take that exposure cleanly.
Builders risk endorsement FAQ
What does a LEG 3 endorsement cover on builders risk?
LEG 3 covers consequential damage to the sound parts of a project caused by defective design, materials, or workmanship. The cost to redo the defective work itself is excluded. LEG 3 is the broadest of the three London Engineering Group clauses (LEG 1 is narrowest, LEG 2 is middle, LEG 3 is widest). It is most commonly added on commercial projects with multiple trades and on custom homes with significant design risk.
How much does a soft costs endorsement add to builders risk premium?
Soft costs typically adds 5 to 10 percent on top of base premium, with a sub-limit selected at quoting. Common sub-limits are $50K, $100K, and $250K. The endorsement covers extra construction-loan interest, property taxes, additional professional fees, and similar expenses incurred during a delay caused by a covered loss.
Is delay in opening the same as soft costs?
No. Soft costs covers expenses you continue to incur during a covered delay (loan interest, taxes, fees). Delay in opening covers income you fail to earn (lost rents, lost business income). Income-producing projects often need both, since the same delay generates both an expense burden and a revenue gap.
Do I need ordinance or law on a renovation?
Almost always. Code is updated frequently, and a partial loss on an older structure usually triggers a code-compliance requirement on the rebuild. Ordinance or law has three sub-coverages: loss to the undamaged portion forced by code, demolition cost of the undamaged portion, and increased cost of construction to current code. All three sub-limits should be quoted.
Does builders risk cover flood?
Flood needs a separate endorsement or a Difference in Conditions layer. The base form excludes it. NFIP (National Flood Insurance Program) is designed for completed structures and is generally not the right product during construction. Most lenders require private flood during the build phase, especially in FEMA Special Flood Hazard Areas.
How do I know if my project needs earthquake coverage?
Two triggers: lender requirement and seismic exposure. California, Oregon, Washington, Utah, Alaska, the New Madrid zone (parts of Missouri, Tennessee, Arkansas, Illinois, Kentucky), and Puerto Rico all have meaningful exposure. California lenders almost always require it. Outside the highest-zone states, the risk drives the decision rather than a rule, and the deductible (often 10 to 20 percent of TIV) is the key number to evaluate.
Can I add an endorsement after the policy binds?
Yes. Mid-policy endorsements are processed in 24 to 48 hours through the BuildersRiskNerd customer portal. Premium is pro-rated for the remainder of the policy term, and the carrier reissues the certificate showing the new coverage. The lender, GC, and named insured all get the updated certificate emailed automatically.
Get a quote with the right endorsements
Tell us about the project. We’ll come back with quotes from carriers that fit, with LEG 3, soft costs, ordinance or law, flood, earthquake, and the rest priced in or priced separately so you can see the impact of each one.
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This guide was written by the BuildersRiskNerd brokerage team. ContractorNerd Insurance Services, LLC has placed builders risk for residential and commercial projects across all 50 states.
This page is a general guide and not a substitute for the policy itself. Coverage terms, exclusions, sub-limits, and endorsement availability vary by carrier and by state. Refer to the bound policy and the carrier’s endorsement forms for actual coverage. For policy-specific questions, talk to a licensed agent.
BuildersRiskNerd is a brand of ContractorNerd Insurance Services, LLC, a licensed insurance producer (CA License #6015566). All insurance products and services are offered through ContractorNerd Insurance Services, LLC. We’re a broker, not an insurer. Policies are underwritten by admitted and non-admitted carriers.