A GC based in Ohio took on a $12 million multifamily project in Fort Lauderdale. The insurance program that worked perfectly on Midwest projects fell apart in Florida. The carrier required a separate named storm deductible of 5% ($600,000), excluded flood entirely, and refused to include wind-borne debris coverage without a $180,000 premium surcharge.

The builders risk vs course of construction requirements in Florida bear almost no resemblance to those in Ohio. Every state imposes different rules, market conditions, and natural hazard exposures that directly affect your builders risk coverage.

This state-by-state guide covers what you need to know before breaking ground in each region.

How State Requirements Differ

No state requires builders risk by statute. But three factors create de facto state-by-state requirements:

Lender mandates vary by local market conditions
Natural hazard exposures force specific endorsements
State insurance regulations affect carrier availability and pricing

The result: a builders risk policy that works in Denver will not work in Miami, and neither will work in San Francisco.

Southeast States: Wind, Flood, and Named Storm Rules

Florida

Florida is the most challenging state for builders risk placement in the U.S. Hurricane exposure drives every underwriting decision.

Key requirements:

Named storm deductible: 2-5% of policy limit (mandatory on most policies)
Wind/hail coverage: Often requires a separate wind-only policy from Citizens Property Insurance if private market declines
Flood: Excluded from standard builders risk; separate NFIP or private flood required in zones A and V
Coverage availability: Only 3-5 carriers actively write builders risk in South Florida
Minimum wind mitigation: Carriers require documentation of tie-down straps, impact-resistant openings, and roof deck attachment

Cost impact: A $5 million wood-frame project in Miami-Dade costs $25,000-$50,000 for builders risk. The same project in Orlando costs $8,000-$15,000. Coastal proximity is the primary rate driver.

Florida Zone	Typical Rate per $100	Named Storm Deductible	Wind Coverage
Miami-Dade / Broward	$0.50-$1.00	5%	Separate policy often needed
Palm Beach / Treasure Coast	$0.40-$0.75	3-5%	Included with surcharge
Central Florida (Orlando)	$0.20-$0.35	2-3%	Included
North Florida (Jacksonville)	$0.18-$0.30	2%	Included
Panhandle	$0.35-$0.60	3-5%	Surcharge

Texas

Texas builders risk requirements split between coastal wind/hail exposure and inland hail-only exposure.

Key requirements:

Wind and hail deductible: 1-5% of policy limit in coastal counties (Galveston, Harris, Nueces)
Texas Windstorm Insurance Association (TWIA): Required for wind coverage in 14 first-tier coastal counties if private market declines
Hail deductible: $10,000-$25,000 inland (Dallas-Fort Worth, San Antonio) where severe hail is common
Flood: Separate policy required in Houston-area flood zones

Cost impact: A $5 million project in Houston costs $12,000-$25,000. The same project in Dallas costs $8,000-$15,000. Austin and San Antonio fall between.

Carolinas and Virginia

Hurricane exposure extends up the Atlantic coast. Since Hurricane Florence (2018) and subsequent storms, carriers tightened requirements in the Carolinas.

Key requirements:

Named storm deductible: 2-3% in coastal counties
Wind coverage: Increasingly sublimited or excluded in Outer Banks and coastal South Carolina
Flood: Required in most barrier island and low-country projects
Coverage availability: Shrinking in coastal Charleston and Wilmington areas

Western States: Earthquake, Wildfire, and Mudslide

California

California presents two distinct builders risk challenges: earthquake in most areas and wildfire in WUI (Wildland-Urban Interface) zones.

Key requirements:

Earthquake: Excluded from standard builders risk. Separate earthquake endorsement adds 50-200% to premium depending on seismic zone and construction type
Wildfire: Projects in CAL FIRE Very High Fire Hazard Severity Zones face sublimits, percentage deductibles (2-5%), or complete exclusion
Brush clearance: Carriers require 100-foot defensible space documentation
FAIR Plan: California's insurer of last resort may be the only option in high-wildfire zones
Mudslide/debris flow: Excluded from standard policies; separate endorsement needed in hillside areas

Cost impact:

California Zone	Base Rate per $100	Earthquake Add-On	Wildfire Add-On
Coastal urban (LA, SF)	$0.20-$0.35	+$0.25-$0.60	N/A (urban)
WUI zones (foothills)	$0.30-$0.50	+$0.25-$0.60	+$0.20-$0.50
Central Valley	$0.15-$0.25	+$0.15-$0.30	Low risk
San Diego	$0.20-$0.35	+$0.20-$0.45	+$0.15-$0.35

A $10 million project in the LA foothills with both earthquake and wildfire endorsements can cost $80,000-$140,000 for builders risk alone.

Washington and Oregon

Key requirements:

Earthquake: The Cascadia Subduction Zone creates significant seismic exposure. Earthquake endorsements cost 25-75% of base premium
Wildfire: Eastern Washington and Oregon face growing wildfire risk. Carriers now applying wildfire exclusion zones similar to California
Volcanic activity: Mount Rainier lahar zones in Washington may face specific exclusions
Flood: Required in floodplain areas along the Columbia River and Puget Sound

Colorado

Key requirements:

Wildfire: Front Range and mountain communities face strict wildfire underwriting
Hail: Eastern Colorado is the highest-frequency hail zone in the U.S. Hail deductibles of 2-5% are standard
Wind: Straight-line wind events (not hurricanes) cause significant losses. Wind deductibles increasingly separate from all-other-perils deductible

Midwest and Plains States: Tornado, Hail, and Wind

Oklahoma, Kansas, Nebraska

Key requirements:

Wind and hail: Separate deductibles of 1-3% are standard across Tornado Alley
Tornado coverage: Included in standard builders risk but deductibles are steep
Flood: Required near major rivers and in areas with poor drainage

Cost impact: These states offer moderate builders risk rates ($0.15-$0.30 per $100) but the wind/hail deductibles create significant out-of-pocket exposure. A 2% hail deductible on a $5 million project means $100,000 before insurance responds.

Illinois, Indiana, Ohio, Michigan

Key requirements:

Relatively favorable builders risk market
Standard deductibles (flat dollar, not percentage-based)
Flood coverage required near Great Lakes and river systems
Wind/hail deductibles: Flat $5,000-$25,000 (not percentage)

These states offer the most competitive builders risk rates and broadest carrier availability in the country.

Midwest State	Typical Rate per $100	Special Requirements
Ohio	$0.12-$0.22	Flood near Lake Erie/rivers
Indiana	$0.12-$0.22	Minimal special requirements
Illinois	$0.14-$0.25	Chicago wind requirements
Michigan	$0.13-$0.23	Flood near Great Lakes

Northeast States: Aging Infrastructure and Winter Risks

New York

Key requirements:

New York City projects face strict carrier underwriting for scaffolding collapse and adjacent property exposure
Facade work requires specific endorsements for sidewalk shed and scaffolding
High-rise projects (over 10 stories) have limited carrier availability
Wind: Percentage deductibles becoming common on Long Island and coastal areas

New England (MA, CT, RI, ME, NH, VT)

Key requirements:

Nor'easter exposure: Named storm or wind deductibles in coastal areas
Winter damage: Ice dam and weight of snow coverage important for projects under construction during winter months
Flood: Coastal New England faces increasing flood zone designations

State-by-State Requirements Summary Table

State	Primary Hazard	Deductible Type	Carrier Availability	Rate Level
Florida	Hurricane/Wind	2-5% named storm	Very limited (coastal)	Very high
Texas	Wind/Hail	1-5% wind/hail	Moderate	High
California	Earthquake/Fire	Varies by peril	Limited (WUI zones)	Very high
Washington	Earthquake	2-5% quake	Moderate	Moderate-High
Colorado	Hail/Wildfire	2-5% hail	Moderate	Moderate
Oklahoma	Tornado/Hail	1-3% wind/hail	Good	Moderate
New York	Wind (coastal)	Flat or 1-2%	Good (except coastal)	Moderate-High
Ohio	None significant	Flat dollar	Excellent	Low
Illinois	Wind	Flat dollar	Excellent	Low-Moderate
North Carolina	Hurricane	2-3% named storm	Limited (coastal)	Moderate-High

How Multi-State GCs Manage Builders Risk

If you build in multiple states, managing different requirements on each project gets complicated. Three strategies work:

Strategy 1: Master program with state-specific endorsements. Your master builders risk program covers all projects nationally. For each project in a CAT-exposed state, you add state-specific endorsements (earthquake in CA, named storm in FL, hail in TX). This keeps one base policy while customizing for local exposures.

Strategy 2: Hybrid approach. Use your master program for standard-risk states and place project-specific policies for high-CAT states. This avoids letting Florida or California exposure drive up rates across your entire portfolio.

Strategy 3: Owner-purchased in high-CAT states. Negotiate contract terms that shift builders risk responsibility to the owner on projects in Florida, California, and coastal Texas. The owner's local broker may have better carrier access in their market.

Whichever strategy you use, tracking certificates of insurance and policy details across multiple states requires a centralized system. Request a demo to see how SubcontractorAudit tracks builders risk compliance by state and project.

FAQs

Do I need to use a state-admitted carrier for builders risk? Not necessarily. Builders risk can be placed with admitted carriers (regulated by the state department of insurance and backed by the state guarantee fund) or with excess and surplus (E&S) carriers (not backed by the guarantee fund). In states like Florida and California where admitted carriers have exited the market, E&S carriers may be your only option. Verify the E&S carrier's financial strength (A.M. Best A- or higher) to compensate for the lack of guarantee fund protection.

What is TWIA and when do I need it in Texas? The Texas Windstorm Insurance Association is a state-created insurer of last resort for wind and hail coverage in 14 first-tier coastal counties and parts of Harris County. You need TWIA when no private carrier will write wind coverage for your project. TWIA coverage requires a WPI-8 certificate confirming your building meets Texas Department of Insurance windstorm building code requirements. Apply for TWIA at least 30 days before you need coverage.

Can I get earthquake coverage on a builders risk policy in California? Yes, but it requires a separate earthquake endorsement or a standalone earthquake policy. The California Earthquake Authority (CEA) does not write builders risk. Earthquake builders risk comes from the private market (domestic carriers and London market). Expect the earthquake endorsement to cost 50-200% of the base builders risk premium depending on seismic zone, construction type, and soil conditions. Steel and concrete structures cost less to insure than wood frame for earthquake.

How do state regulations affect builders risk claims? Each state has different prompt payment statutes, bad faith standards, and coverage interpretation rules. In some states (California, Florida, Texas), the insurance department actively regulates claims handling timelines and mandates specific dispute resolution processes. In others, the policyholder's recourse is limited to litigation. Know your state's claims handling regulations before a loss occurs so you can enforce your rights.

What happens if I start a project in one state and my builders risk carrier does not write in that state? If your current carrier is not licensed (admitted) or eligible (E&S) to write builders risk in the project's state, they cannot issue a policy there. Your broker must find a carrier licensed in that state. This is common when GCs expand into Florida or California for the first time. Start the insurance procurement process early and work with a broker who has national market access.

Are there states where builders risk is easier to obtain? Yes. The Midwest and Mid-Atlantic states (Ohio, Indiana, Michigan, Pennsylvania, Virginia inland) offer the broadest carrier availability, lowest rates, and simplest underwriting requirements. These states have lower catastrophe exposure, which means more carriers compete for the business and rates stay competitive. If you are a GC choosing where to expand, insurance costs are meaningfully lower in these states compared to coastal or western markets.