Hurricane & Windstorm Insurance Requirements for Texas Apartment Buildings

How Texas Windstorm Insurance Works: Coastal vs. Inland

Texas has a unique dual-market system for windstorm coverage that confuses many multifamily investors, especially those buying their first coastal property.

Coastal Texas: The TWIA Territory

In the 14 first-tier coastal counties and designated portions of Harris County, most admitted (standard) insurance carriers exclude wind and hail from commercial property policies. This is because catastrophe modeling shows these areas face unacceptable hurricane risk for standard pricing.

Property owners in these areas must obtain windstorm coverage separately, typically through:

1. TWIA (Texas Windstorm Insurance Association) — the state-created insurer of last resort
2. Private surplus lines carriers — non-admitted carriers willing to write coastal wind at higher premiums
3. Hybrid arrangements — standard policy for all perils except wind, plus a separate wind policy

TWIA-Eligible Counties (First-Tier Coastal)

Source: Texas Department of Insurance, TWIA designated catastrophe area map (28 Tex. Admin. Code §5.4001)

Inland Texas: Wind Included, But Watch the Deductible

For multifamily properties outside the coastal zone (Dallas-Fort Worth, Austin, San Antonio, El Paso, Lubbock, etc.), wind and hail coverage is typically included in the standard commercial property policy. However, there are important differences from how most owners expect it to work:

• Separate wind/hail deductible: Instead of the standard $5,000–$25,000 per-occurrence deductible, wind/hail claims carry a percentage-based deductible — typically 1–2% of the building's insured value
• Example: A $5 million building with a 2% wind/hail deductible means $100,000 out-of-pocket before coverage pays
• Cosmetic damage exclusions: Many policies now exclude "cosmetic" hail damage to metal roofs/siding — only functional damage is covered

Understanding TWIA: The Texas Windstorm Insurance Association

What TWIA Covers

• Wind and hail damage to the building structure
• Contents coverage (optional, for common area furnishings and equipment)
• Loss of use / rental income (up to the policy limit)

What TWIA Does NOT Cover

• Flood damage — requires separate NFIP or private flood policy
• Storm surge — classified as flood, not wind
• Fire, theft, liability — covered under your separate commercial property policy
• Gradual deterioration — pre-existing damage or deferred maintenance

TWIA Premium Costs for Multifamily Buildings

Source: TWIA rate schedules filed with TDI. Actual premiums vary based on construction type, age, WPI-8 compliance, and loss history.

TWIA Maximum Coverage Limits

TWIA has statutory maximum coverage limits that affect larger multifamily portfolios:

• Per-structure limit: $4.4 million for commercial buildings (as of 2026)
• Properties valued above this limit need excess windstorm coverage from a surplus lines carrier
• TWIA's total exposure cap is approximately $100 billion across all policyholders — during an extreme hurricane season, assessments may be levied on other Texas insurance policies to cover shortfalls

The WPI-8 Certificate: Your Windstorm Inspection Requirement

To qualify for TWIA coverage, buildings must have a WPI-8 certificate (Windstorm Inspection Certificate) issued by a TDI-certified inspector. This certificate confirms the property meets Texas windstorm building code standards.

What the WPI-8 Inspection Covers

• Roof-to-wall connections: Hurricane straps, clips, or tie-downs
• Roof covering: Type, age, and installation quality
• Wall construction: Structural integrity and bracing
• Opening protection: Windows, doors, and garage openings
• Foundation connections: Anchor bolts and sill plate attachments

WPI-8 Costs and Timeline

• Inspection cost: $500–$2,000 for multifamily buildings (varies by size)
• Timeline: Schedule 2–4 weeks in advance; results typically within 1 week
• Renewals: Required when significant modifications are made; otherwise the certificate generally remains valid
• Failed inspections: Inspector will identify required repairs; re-inspection after corrections

Deductible Structures You Need to Understand

Types of Wind-Related Deductibles

Deductible Example: $5 Million Apartment Building

• AOP deductible: $10,000 (flat)
• Wind/hail deductible: 2% = $100,000
• Named storm deductible: 5% = $250,000

This means a hail storm causing $80,000 in damage would be entirely out-of-pocket under the 2% wind deductible. A hurricane causing $500,000 in damage would mean $250,000 out-of-pocket under the 5% named storm deductible.

Post-Hurricane Season: What Multifamily Owners Must Do

Immediate Post-Storm Actions (First 72 Hours)

1. Document everything: Photos and videos of all damage with timestamps
2. Emergency repairs only: Tarp roofs, board windows, pump water — but don't start permanent repairs
3. Notify your carrier immediately: Most policies require notice "as soon as practicable" — ideally within 24–48 hours
4. Protect tenants: Relocate if necessary; loss-of-rental-income coverage should apply
5. Separate wind vs. water damage: Take photos showing the source of each type of damage

Claims Filing Requirements

• TWIA claims deadline: File within one year of the storm event for supplemental claims
• Proof of loss: Sworn statement required, typically within 91 days of the loss
• Independent adjuster: TWIA sends their own adjuster, but you can (and should) hire a public adjuster to represent your interests
• Appraisal process: If you dispute TWIA's damage estimate, Texas law allows you to invoke an appraisal process

Renewal Season Preparation

Texas commercial property insurance renewal season for coastal properties is typically April–June, ahead of hurricane season (June 1). Steps to take:

• Review coverage limits: Ensure insured values reflect current replacement costs (construction costs have risen 30–40% since 2020)
• Update WPI-8: If you've made improvements, get a new inspection to document wind-mitigation upgrades
• Shop the market: TWIA rates are filed, but private surplus lines pricing varies significantly between carriers
• Consider higher deductibles: Moving from 2% to 5% named storm deductible can save 15–25% on wind premium
• Bundle strategically: Some carriers offer all-perils coverage (including wind) at competitive rates for well-maintained buildings

Wind Mitigation: Reduce Your Premium and Protect Your Building

Investing in wind-mitigation features can reduce windstorm premiums by 10–30% and dramatically reduce actual storm damage:

Source: IBHS FORTIFIED Commercial standards; FEMA P-804 Wind Retrofit Guide for Residential Buildings; TDI wind-mitigation credit schedules

Flood Insurance: The Coverage Gap That Burns Coastal Owners

Windstorm insurance does NOT cover flooding — even flooding caused by a hurricane. Texas multifamily owners in coastal areas need both:

• NFIP (National Flood Insurance Program): Maximum $500,000 per building (often insufficient for multifamily)
• Private excess flood: Covers amounts above NFIP limits; essential for buildings valued above $500,000
• Contents coverage: NFIP commercial contents limit is $500,000; private excess available

According to FEMA, 40% of flood claims come from properties outside high-risk flood zones. Even if your property isn't in a Special Flood Hazard Area, flood insurance is a wise investment for any coastal Texas multifamily building.