What Is the 25% Rule for Roofing, and Does It Apply in Texas?

What the 25% Rule Actually Says

Florida Building Code sections R908.1.1 (residential) and 706.1.1 (commercial) say that if more than 25 percent of a roof section is repaired, replaced or recovered within any 12-month period, the entire roof section must be brought up to the current code. The purpose is hurricane resilience: Florida does not want a roof that is half old, half new, with the old half still attached by 1980s nailing standards.

In practice, Florida homeowners and adjusters use it in insurance disputes. If a storm damages more than a quarter of a slope, the rule can turn a repair estimate into a replacement, and Florida courts have ruled both ways on who pays for the code-upgrade portion. None of that case law applies in Texas.

Why It Does Not Apply in Texas

Texas has no statewide building code for single-family homes. Each city adopts its own, and most Houston-area cities, including Houston, Katy and Conroe, use a version of the International Residential Code. Unincorporated Harris, Fort Bend and Montgomery County do not enforce a residential building code for re-roofing at all, outside floodplain rules.

The IRC does not contain a 25 percent threshold. Blogs that describe a "Texas 25% rule" are usually either copying Florida articles or describing an insurer's internal matching practice, which is a policy matter, not a code.

What Houston's Code Does Require on a Roof

Under the International Residential Code as adopted in the Houston area, three rules affect almost every repair or replacement:

• Replacement means a full tear-off. IRC R908.3 requires removal of existing roof coverings down to the deck when a roof is replaced. An overlay is a "roof recover," a different and more limited thing.
• No recover over two layers. IRC R908.3.1.1 prohibits installing a new roof covering where the existing roof already has two or more layers. If your roof has two layers, the next job is a tear-off regardless of how small the leak is.
• Permits inside city limits. The City of Houston requires a residential re-roof permit (form CE-1109, $147.38 in 2026) with an inspection; the City of Katy and the City of Conroe require permits as well. Unincorporated county addresses do not, outside a mapped floodplain.

What Actually Decides Repair vs. Replacement in Texas

With no 25 percent threshold, the decision comes down to the condition of the roof and, on a claim, the policy. A repair is the right answer when the damage is confined to one area, the surrounding shingles still hold granules and flex without cracking, and the roof has at least several years of realistic life left. A replacement is right when leaks keep appearing in new places, granule loss shows across whole slopes, or hail has bruised the mat across several slopes.

On an insurance claim, the question becomes whether the damaged slopes can be repaired with matching materials. Most Texas policies do not contain a matching clause, so an insurer can pay to repair one slope even if the new shingles will not match. Some policies and some carriers do consider "reasonable match," and a supplement with photos of the discontinued product can change the outcome. This is where documentation, not a code rule, wins or loses the claim.

The Texas Rules That Do Matter for Your Claim

If you are filing a hail or wind claim in the Houston area, these are the rules that actually shape the result:

• Reporting window. Most Texas policies now require hail and wind damage to be reported within one year of the storm date, not the date you found a leak.
• Actual cash value. Many carriers move roofs past 10 to 15 years to depreciated coverage, and some use a roof payment schedule that pays as little as 40 percent at 20 years.
• Cosmetic exclusions. Hail dents that do not affect the roof's function can be excluded; bruised shingle mats are functional damage and covered.
• Deductibles. Texas deductibles are usually 1 to 2 percent of dwelling coverage, and it is illegal for a contractor to waive or pay them (HB 2102, 2019).
• Class 4 discounts. Most Texas carriers discount the wind and hail portion of the premium for UL 2218 Class 4 impact-resistant shingles.

HOA and Township Rules Are the Other "Code"

In the northwest Houston suburbs, the rule most likely to affect a partial repair is not a building code but an architectural standard. Most Cypress, Katy and Spring HOAs require approval of shingle color and product, and a repair with non-matching shingles can be flagged. The Woodlands Township requires a covenant permit for any change of roofing color or material, even on part of a roof. When a matching product has been discontinued, that can push a large repair toward a replacement for appearance reasons, not code reasons.

Frequently Asked Questions