By Rose Granados · Licensed Insurance Agent · Granados Insurance Agency
On the Texas coast, the wind coverage inland homeowners take for granted often lives in a separate policy with its own rules, eligibility requirements, and paperwork. Here's how the whole system works — the designated territory, TWIA, the WPI-8 certificate, and the private alternatives — from a licensed agency in first-tier coastal Brazoria County.
On the Texas coast, wind and hail coverage often lives in its own policy — and getting it has rules. In the designated territory — the 14 first-tier coastal counties plus parts of Harris County east of Highway 146 — insurers commonly exclude wind from homeowners policies ("ex-wind"), and the coverage is written separately through TWIA or a private wind insurer. TWIA eligibility requires three things: a property in the territory, a declination from at least one authorized insurer, and a windstorm certificate of compliance (WPI-8) for structures built or altered since 1988. Windstorm deductibles typically run as a percentage of your dwelling limit — so a 2% deductible on a $400,000 home is about $8,000 out of pocket. If you're coastal, the practical move is knowing which policy carries your wind, whether your certificates are in order, and what your deductible is in real dollars.
Ask an inland Texas homeowner about their wind coverage and they'll shrug — it's in the homeowners policy, like everywhere else. Ask a coastal homeowner and you'll hear about a second policy, an eligibility process, a certificate with a form number, and a deductible calculated in percentages. Same state, completely different system.
We're a licensed Texas agency in first-tier coastal Brazoria County, which means this system is our daily work. This guide explains the whole structure: where the designated windstorm territory actually runs, why coastal homeowners policies exclude wind, how TWIA works and what it takes to qualify, what the WPI-8 certificate is and why it can make or break your coverage, how percentage deductibles really add up, and where private windstorm insurance fits. Rules and availability change, so treat this as the current landscape and confirm the specifics for your address.
How Does Windstorm Insurance Work on the Texas Coast?
The short answer: in the designated coastal territory, wind and hail are commonly carved out of homeowners policies and written separately.
The system runs on geography. Texas designates a coastal windstorm territory — the 14 first-tier coastal counties (including Brazoria and Galveston locally) plus portions of Harris County east of State Highway 146. Inside that territory, insurers commonly exclude wind and hail from standard homeowners policies. The result is what the industry calls an "ex-wind" policy: your homeowners coverage handles fire, theft, liability, and non-flood water damage, while wind and hail live in a separate policy entirely.
That separate wind coverage comes from one of two places: the Texas Windstorm Insurance Association (TWIA) — the state's residual-market insurer of last resort, operating under Texas Insurance Code Chapter 2210 — or a private insurer still willing to write wind at your address. Our coastal home insurance guide shows how this fits into the full three-policy picture with flood.
Are You in the Designated Windstorm Territory?
The short answer: if you're in one of the 14 first-tier coastal counties, or in Harris County east of Highway 146, yes.
The designated area, per TWIA, covers these fourteen counties: Aransas, Brazoria, Calhoun, Cameron, Chambers, Galveston, Jefferson, Kenedy, Kleberg, Matagorda, Nueces, Refugio, San Patricio, and Willacy — plus the parts of Harris County east of Highway 146.
Two local implications worth spelling out. First, the boundary is a county line, not a distance from the beach — a Pearland or Alvin home in Brazoria County is in the territory even though it's a long drive from open Gulf water, while a Houston home twenty minutes north sits outside it. Second, being in the territory doesn't automatically mean your policy excludes wind. Some insurers still include wind for some coastal properties. The only way to know which situation you're in is to read your declarations page — which is exactly the check many coastal homeowners have never done.
Pull up your homeowners declarations page and look for a windstorm or wind/hail exclusion endorsement. If it's there, your homeowners policy will pay nothing for wind damage — and you need to be able to point to the separate policy that does. If you can't find one, that's not an inconvenience to sort out later; it's a gap, and hurricane season is the wrong time to discover it.
How Does TWIA Coverage Work — and Who Qualifies?
The short answer: TWIA writes wind and hail only, as a last resort, with three eligibility requirements.
TWIA exists because the private market retreated from coastal wind risk decades ago; the Legislature created the association in 1971 to guarantee coastal Texans could still buy wind coverage. It is deliberately a market of last resort — built to be the backstop, not the first stop. Per TWIA, eligibility requires:
- Location in the designated territory. The 14 first-tier counties or eligible parts of Harris County east of Highway 146.
- A declination. You must have been denied wind and hail coverage by at least one authorized insurer actively writing in the designated area. This is the requirement people don't expect — you have to try the regular market first.
- A windstorm certificate of compliance. Structures constructed, altered, remodeled, enlarged, or repaired on or after January 1, 1988 generally must be certified as built to the applicable windstorm building code — with limited exceptions.
There's a fourth requirement for certain properties: homes in flood zones V, VE, or V1-30 that were constructed or altered on or after September 1, 2009 and can obtain NFIP coverage must show proof of flood insurance. And the property must be maintained in insurable condition — in good repair, without unrepaired damage.
What does a TWIA policy actually cover? Wind and hail, full stop — for the dwelling, personal property, and certain miscellaneous items including fences, swimming pools, signs, and flagpoles. Everything else stays with your other policies. TWIA also has maximum limits it can write, which matter for higher-value homes; current limits are published at twia.org, and where a home's rebuild cost exceeds them, excess coverage from the private market fills the difference.
What Is the WPI-8 Certificate — and Why Does It Matter So Much?
The short answer: it's proof your structure was built to the coastal windstorm code — and without it, TWIA eligibility gets complicated.
The windstorm certificate of compliance — the WPI-8 — documents that a structure, or specific work on it, was built to the windstorm building code applicable on the coast. The Texas Department of Insurance issues the WPI-8 and WPI-8-E. TWIA issued its own version, the WPI-8-C, for completed improvements between 2017 and 2020 — those certificates remain valid, but since June 1, 2020, TDI issues all new certificates. The requirement generally attaches to anything constructed, altered, remodeled, enlarged, or repaired on or after January 1, 1988.
Notice how broad that language is. It isn't just new homes — it's the roof you replaced, the room you added, the garage you enclosed. Uncertified work on an otherwise certified home can complicate windstorm coverage for the property. The two moments this bites hardest: buying a coastal home (always ask the seller for windstorm certificates before closing) and renovating one (use contractors who understand the certification process and confirm the paperwork before the work starts, not after). We cover the certificate in full detail — how to get one, how to check for one, what to do if work wasn't certified — in our WPI-8 certificate guide.
How Do Coastal Windstorm Deductibles Work?
The short answer: as a percentage of your dwelling limit — which turns into a much bigger dollar figure than most homeowners expect.
Windstorm and hurricane deductibles on the coast are typically percentage deductibles — commonly 1%, 2%, or 5% of your dwelling coverage, with some policies higher. The percentage applies to your coverage limit, not to the size of your claim:
| Dwelling limit | 1% deductible | 2% deductible | 5% deductible |
|---|---|---|---|
| $250,000 | $2,500 | $5,000 | $12,500 |
| $400,000 | $4,000 | $8,000 | $20,000 |
| $500,000 | $5,000 | $10,000 | $25,000 |
Illustrative math only — deductible structures vary by policy and insurer. Calculate yours from your actual declarations page.
Two things make this sting. The deductible grows automatically as your dwelling limit grows — right behavior (insuring to rebuild cost), bigger number. And after a hurricane, your windstorm deductible stacks alongside your separate flood deductible if both policies respond. Our full guide to Texas wind and hail deductibles walks through the math and the choices; our wind vs. flood guide covers what happens when one storm triggers both policies.
What About Private Windstorm Insurance?
The short answer: a real alternative for many coastal homes — sometimes required as the first stop, and sometimes the better fit.
TWIA's declination requirement builds the private market into the process: you can't get to TWIA without asking the private market first. But private wind isn't just a box to check. Depending on your property's age, construction, condition, and location within the territory, a private insurer may genuinely want the risk — and a private policy can differ from TWIA in limits, terms, deductible options, and how it fits with your homeowners policy. Some insurers will even write wind back into a homeowners policy for well-built coastal homes.
The practical takeaway isn't that one market beats the other — it's that the answer is property-specific, and it changes over time as insurer appetite shifts. A home that needed TWIA five years ago may have private options today, and vice versa. That's worth a fresh look at every renewal rather than assuming last year's answer still holds.
How Do You Put Coastal Wind Coverage Together?
The short answer: know which policy carries your wind, verify your certificates, and calculate your deductibles — before the season.
The working checklist for a coastal homeowner:
- Read your declarations page and determine whether wind is included or excluded from your homeowners policy.
- If excluded, locate your windstorm policy — TWIA or private — and confirm it's in force with limits that match your homeowners dwelling limit.
- Verify your windstorm certificates, especially if the home was built or altered since 1988, before you need them.
- Calculate every deductible in dollars — wind, homeowners, and flood.
- Confirm the flood piece. TWIA never covers rising water, and certain V-zone properties must carry flood to keep TWIA eligibility. Our Texas flood insurance guide covers that side.
- Re-check at renewal. Insurer appetite, TWIA limits, and your home's rebuild cost all move.
That's a thirty-minute review with someone who does this daily — and it's precisely the review we offer, free, to coastal homeowners across the Bay Area.
The Bottom Line on Texas Windstorm Insurance
Here's the whole thing in a few sentences. In the designated coastal territory — the 14 first-tier counties plus Harris County east of Highway 146 — wind and hail are commonly excluded from homeowners policies and written separately, through TWIA or a private wind insurer. TWIA is the last resort by design: you need a property in the territory, a declination from at least one authorized insurer, and a windstorm certificate of compliance for structures built or altered since 1988 — plus proof of flood insurance for certain V-zone properties. TWIA covers wind and hail only, and coastal wind deductibles typically run as a percentage of your dwelling limit, which turns into serious money on paper you should calculate before a storm rather than after.
If you're coastal, the review that matters takes half an hour: which policy carries your wind, whether your certificates are in order, what your deductibles total in real dollars, and whether the private market has an option TWIA can't match this year. We do that review every week from right here in first-tier Brazoria County — free, no obligation, and far better done in the spring than in September.
Frequently Asked Questions
Inland, wind and hail are normally included in your homeowners policy. In the designated coastal territory — the 14 first-tier coastal counties plus parts of Harris County east of Highway 146 — insurers commonly exclude wind and hail from homeowners policies, leaving what's called an ex-wind policy. The wind coverage is then written separately: through the Texas Windstorm Insurance Association (TWIA), the state's insurer of last resort under Texas Insurance Code Chapter 2210, or through a private insurer willing to write wind at your address. A coastal homeowner typically carries an ex-wind homeowners policy plus a separate windstorm policy, each with its own deductible.
Three main requirements. The property must be located in the designated coastal territory — the 14 first-tier counties or eligible parts of Harris County east of Highway 146. The applicant must have been declined wind and hail coverage by at least one authorized insurer actively writing in that area, because TWIA is a market of last resort. And the structure must hold a windstorm certificate of compliance — generally required for structures constructed, altered, remodeled, enlarged, or repaired on or after January 1, 1988. Properties in certain V flood zones built or altered on or after September 1, 2009 must also show proof of flood insurance if NFIP coverage is available.
A WPI-8 is a windstorm certificate of compliance — documentation that a structure, or work done on it, was built to the applicable windstorm building code for the Texas coast. The Texas Department of Insurance issues the WPI-8 and WPI-8-E; TWIA issued its own version, the WPI-8-C, from 2017 to 2020, and those remain valid. Certification is generally required for TWIA eligibility on structures built, altered, remodeled, enlarged, or repaired on or after January 1, 1988 — which means an uncertified addition or renovation can complicate windstorm coverage for the whole property. If you're buying or renovating a coastal home, confirm certification status ahead of time.
Wind and hail — that's the entire scope. A residential TWIA policy can cover the dwelling and personal property, and coverage extends to certain miscellaneous items such as fences, swimming pools, signs, and flagpoles. What TWIA does not cover is everything else: fire, theft, liability, water damage, and flood all remain with your other policies. That's why coastal homeowners typically carry TWIA alongside an ex-wind homeowners policy, and often a separate flood policy as well — three policies, each covering its own slice of the risk.
Coastal windstorm deductibles are typically calculated as a percentage of your dwelling coverage rather than a flat dollar amount — commonly 1%, 2%, or 5%, with some policies higher. The percentage applies to your coverage limit, not your claim size, so a 2% deductible on a $400,000 dwelling limit means roughly $8,000 out of pocket before coverage pays, whether the damage is $15,000 or $150,000. Because it scales with your dwelling limit, the deductible grows as your coverage grows. Calculating the actual dollar figure in advance — for every policy you carry — is one of the most valuable pieces of storm preparation there is.
Get a Free Windstorm Coverage Review
Not sure whether your policy includes wind, whether your certificates are in order, or what your deductible totals in dollars? Our team in first-tier Brazoria County reviews all of it. Free, no obligation.
✓ Last reviewed by the Granados Insurance Agency team on . We refresh our guides quarterly — TWIA rules, territory details, and certification requirements change.
This guide is general information, not coverage or legal advice, and is not a quote. Windstorm eligibility, certificate requirements, TWIA maximum limits, deductible structures, and private-market availability vary by property, address, and insurer and can change; deductible figures shown are illustrative math, not quotes. Nothing here guarantees eligibility, availability, or any particular outcome for your property. Always verify current requirements with TWIA (twia.org) and the Texas Department of Insurance (tdi.texas.gov), and confirm your own coverage with a licensed agent or your insurer.
Written and reviewed by the Granados Insurance Agency team — licensed Texas insurance professionals based at 9639 Scarsdale Blvd, Ste 101, Pearland, TX, inside first-tier coastal Brazoria County. Program details here are drawn from the named sources cited above — the Texas Windstorm Insurance Association, the Texas Department of Insurance, and Texas Insurance Code Chapter 2210 — and reviewed quarterly. Eligibility and availability are address-specific; confirm yours with a licensed agent. TX license #[insert].