A custom home builder in Charlotte lost $127,000 when copper wiring and HVAC equipment vanished from an unoccupied home during the framing-to-drywall phase. His builders risk insurance for new home construction did not include a theft endorsement. The claim was denied in full.

This is one of eight common mistakes that residential builders make with builders risk coverage. Each mistake seems minor until a loss exposes the gap. Here is what goes wrong, why it happens, and how to fix it before a claim forces the lesson.

Mistake 1: Undervaluing Materials in Transit

Most residential builders insure the project at its completed value on site. They forget that $80,000 in custom cabinetry, $45,000 in windows, or $30,000 in roofing materials can be destroyed during transit from the supplier to the job site.

Standard builders risk policies include limited transit coverage. The default sublimit is often $25,000. If a flatbed carrying $60,000 in engineered trusses overturns on the highway, you collect $25,000 and absorb the $35,000 difference.

The fix: Request a transit endorsement with a sublimit matching your largest single material delivery. Custom home projects with high-value finishes should carry $75,000-$150,000 in transit coverage. The additional premium is usually $200-$500 per year.

Material Category	Typical Single Delivery Value	Recommended Transit Sublimit
Engineered trusses/beams	$30,000-$80,000	$100,000
Windows and doors	$20,000-$60,000	$75,000
Custom cabinetry	$25,000-$90,000	$100,000
Appliance packages	$15,000-$50,000	$50,000
Roofing materials	$10,000-$35,000	$50,000

Also verify where transit coverage begins. Some policies cover from the supplier's loading dock. Others only trigger once the materials cross onto the project site. The difference matters.

Mistake 2: Leaving Coverage Gaps Between Foundation and Framing Phases

Some builders buy coverage in phases. They insure the site work and foundation phase, then let coverage lapse during the 2-4 week wait for framing crews.

During that gap, the exposed foundation sits unprotected. A heavy rain floods the foundation. Frost heave cracks the footings. A vehicle backs into the forms. None of this is covered because no policy is in force.

The fix: Purchase builders risk from day one of site work through project completion. Never buy phased coverage. The premium difference between a 10-month policy and a 12-month policy is minimal (typically $300-$800 on a residential project). That small savings is not worth the exposure.

Mistake 3: Not Extending Coverage for Construction Delays

Residential projects run late. Weather, material shortages, permit delays, and subcontractor scheduling all push completion dates. A 2024 NAHB survey found that the average custom home takes 12.2 months to build, but 38% of projects exceed 14 months.

If your builders risk policy runs 12 months and your project stretches to 15 months, you have three months of exposure with no coverage. Carriers will not backdate extensions after a loss.

The fix: Build a 90-day cushion into your initial policy term. If you estimate 12 months of construction, buy a 15-month policy. The additional premium is pro-rata (roughly 25% more). If you finish early, some carriers provide a short-rate refund.

Set a calendar reminder 60 days before the policy expiration to request an extension if needed. Most carriers process extensions in 3-5 business days, but you must ask before the policy expires.

Mistake 4: Ignoring Soft Cost Coverage

When a fire or storm delays your project by three months, the hard cost damage is obvious. Less obvious are the soft costs that pile up during the delay:

Construction loan interest: $2,000-$8,000 per month on a typical custom home loan
Extended general conditions (site supervision, portable toilets, dumpsters): $3,000-$6,000 per month
Architect and engineering fees for redesign: $5,000-$15,000
Additional permit fees: $1,000-$3,000
Real estate taxes during the extended build: $500-$2,000 per month
Lost rental income if it is a spec home: varies

On a $1.5 million custom home, a three-month delay can generate $30,000-$60,000 in soft costs that standard builders risk does not cover.

The fix: Add a soft cost endorsement (also called delay in completion coverage). This endorsement typically costs an additional 5-15% on top of the base premium. For a base premium of $3,000, the soft cost add-on runs $150-$450. That is cheap protection against $30,000+ in delay-related expenses.

Set the soft cost sublimit at 10-15% of the total project value to cover a realistic delay scenario.

Mistake 5: Failing to Add a Theft Endorsement in High-Risk Areas

Material theft on residential construction sites hit $1 billion annually across the U.S. according to the National Equipment Register. Copper, HVAC units, appliances, and power tools are the most common targets.

Many standard builders risk forms include theft coverage. Some do not. And even when the base form covers theft, the sublimit may be inadequate.

Unoccupied homes under construction are easy targets. No alarm systems, no occupants, often no fencing. The framing-to-drywall phase is the highest-risk period because expensive mechanical and electrical rough-in materials sit exposed.

The fix: Confirm your policy includes theft of building materials and supplies. Verify the sublimit covers at least $50,000 in materials, or higher if your project involves premium finishes.

Add these site security measures to strengthen your theft prevention (and satisfy carrier requirements):

Lockable job boxes for small tools and materials
Temporary fencing with locked gates
Motion-activated lighting
Trail cameras at entry points
GPS trackers on HVAC units and generators
Requiring suppliers to deliver only when crews are on site

Some carriers offer 5-10% premium discounts for documented theft prevention programs.

Mistake 6: Overlooking Ordinance or Law Coverage

Building codes change. If a partially completed home suffers a loss, the municipality may require compliance with current codes during reconstruction. Those upgraded requirements cost money.

Example: You build a custom home to 2022 energy codes. A fire destroys the framing. The 2025 code now requires R-49 attic insulation instead of R-38, upgraded electrical panel capacity, and enhanced moisture barriers. The code-mandated upgrades add $18,000 to the reconstruction cost. Standard builders risk pays to rebuild to the original specifications only.

The fix: Add an ordinance or law endorsement. This covers the increased cost of construction required by building code changes that took effect after you started the original project. The endorsement typically adds 3-8% to the premium and carries a sublimit of 10-25% of the policy limit.

Mistake 7: Not Requiring a Waiver of Subrogation

Your framing subcontractor accidentally starts a fire that burns the partially framed house. The builders risk carrier pays $200,000 to rebuild. Then the carrier sues your framing sub to recover the $200,000.

Now your sub faces financial ruin. Your relationship with a key trade partner is destroyed. And your next project may struggle to find a framing crew willing to work for you.

The fix: Require a waiver of subrogation endorsement on every builders risk policy. This endorsement prevents the carrier from suing any named insured or other party the policyholder has agreed to hold harmless.

AIA A201 Section 11.3.7 requires the owner and contractor to waive all rights of subrogation against each other and their subcontractors. If your contract includes this language, make sure the builders risk policy matches with a formal waiver endorsement.

The waiver typically costs nothing or adds only 1-3% to the premium. It is the cheapest endorsement that prevents the most damage to your subcontractor relationships.

Mistake 8: Treating the Certificate of Insurance as Proof of Adequate Coverage

You collect a certificate showing builders risk coverage on your project. You file it and move on. But the certificate tells you almost nothing about what the policy actually covers.

A certificate of insurance cannot:

Expand or alter coverage
Guarantee specific endorsements are in force
Confirm you are actually named on the policy
Override policy exclusions or conditions

The fix: Request copies of the actual policy documents:

Declarations page showing named insureds, limits, deductibles, and policy period
Policy form identifying whether it is named perils or all-risk
Endorsement schedule listing every endorsement attached to the policy
Waiver of subrogation endorsement confirming it is in force

Review these documents before construction starts. Flag any gaps to the policy purchaser (owner or GC, depending on the contract) and get confirmation in writing that corrections will be made.

Tracking certificates and policies across multiple homes and subdivisions requires a system. SubcontractorAudit's COI tracking stores policy documents alongside certificates and alerts you when coverage gaps exist.

Cost of Each Mistake: A Summary

Mistake	Typical Uninsured Loss	Fix Cost (Annual Premium Add-On)
Undervaluing transit coverage	$25,000-$100,000	$200-$500
Phase coverage gaps	$10,000-$250,000	$300-$800
No delay extension	Full project exposure	Pro-rata premium for extra months
No soft cost coverage	$30,000-$60,000	$150-$450
No theft endorsement	$15,000-$80,000	Included or $100-$300
No ordinance/law coverage	$10,000-$50,000	$100-$250
No waiver of subrogation	$50,000-$500,000+	$0-$100
Relying on certificate alone	Varies widely	$0 (just review documents)

The total cost to fix all eight mistakes: roughly $850-$2,400 per year on a typical custom home project. The total uninsured exposure from ignoring them: $140,000 to $1 million or more.

FAQs

Does builders risk insurance cover a spec home after it is completed but before it sells? Standard builders risk ends when the home is completed or occupied, whichever comes first. If you finish a spec home and it sits vacant for four months while listed for sale, you need a vacant building endorsement or a transition to a standard property/dwelling policy. Some carriers offer a 30-90 day completed operations extension, but you must request it before the builders risk expires.

Should I buy builders risk for each home in a subdivision or use one policy for the entire development? A master builders risk policy covering the entire subdivision is more cost-effective than individual per-home policies. The master policy uses a per-location limit and an aggregate limit. You report each new home as it starts and remove it as it completes. Savings typically run 20-30% compared to individual policies. This also simplifies your administrative tracking significantly.

What is the minimum value project that justifies builders risk insurance? Any project where the cost to rebuild would cause financial hardship justifies builders risk. Even a $50,000 renovation should have coverage if the homeowner's existing property policy excludes construction work. Most carriers set minimum premiums between $750 and $1,500, which is reasonable insurance for any project over $100,000.

How do I handle builders risk when the homeowner wants to purchase the policy? This is common on custom homes where the homeowner hires the GC. Let the homeowner's insurance agent place the policy, but provide them with the coverage checklist from this article. Request named insured status for your company and all subcontractors. Review the policy before construction starts. If the homeowner's agent is unfamiliar with builders risk, recommend a broker who specializes in construction insurance.

Does builders risk cover landscaping and hardscaping installed during construction? Most policies exclude landscaping (sod, trees, plants) but cover hardscaping (retaining walls, concrete patios, driveways) that is considered part of the structure. If your project includes significant landscaping ($20,000+), ask about a landscape endorsement. This endorsement carries a sublimit (typically $25,000-$50,000) and covers established landscaping destroyed by covered perils during the construction period.

What happens if I discover water damage weeks after it occurred? Builders risk covers direct physical loss, but timely discovery matters. Most policies require you to report losses promptly after discovery. If you discover water damage during a routine site visit, report it immediately. The key question is when the damage occurred versus when you discovered it. If a slow leak caused damage over several weeks, coverage may still apply from the date the damage began, not the discovery date. Document the discovery timeline thoroughly.