Pearland, Friendswood and Alvin all sit in a region the Handbook of Texas describes as prone to hurricanes and floods. If your home is in a mapped floodplain, a large foundation repair can involve more than the foundation.
The 50 percent rule, in Pearland's words
After Hurricane Harvey, Pearland's Engineering department sent owners substantial damage letters. The 2018 letter explains the rule: when the cost to repair or restore a building equals or exceeds 50 percent of the building's value, the structure counts as substantially damaged. Pearland used the Brazoria County Appraisal District's value for the structure, compared it with repair estimates, and let owners submit additional contractor quotes for reconsideration.
For a substantially damaged home, the letter says, the lowest floor must be raised to 12 inches above the base flood elevation under the city code.
Why this matters for foundation work
That letter was about storm damage. Cities can also ask for cost figures on repairs in flood zones: Houston's foundation repair permit, for example, asks for a sealed cost estimate or notarized contract and an appraisal when the house is in one. So in a floodplain:
- Keep your written repair quote and any engineer's estimate.
- Know your structure's appraised value.
- Ask the city early whether your repair, combined with any other work, gets near the threshold.
Lessons from local storms
- Alvin: Tropical Storm Claudette stalled over the city in July 1979 and dropped 43 inches of rain in 24 hours, at the time a U.S. record.
- Friendswood: Hurricane Harvey in 2017 devastated the city, and residents have since built homes higher to avoid flooding.
After a flood
Flooding and foundation movement are separate problems that can show up together. If cracks appear or doors start sticking after a flood, record them with dated photos and ask an inspector to look at both the structure and the drainage. Our second opinion page covers independent engineering reports.
Flood rules are specific to your property and the current maps. Ask the city's floodplain administrator before you plan major work.
Sources
- City of Pearland: Substantial damage assessment letter (Engineering, 2018)
- Houston Permitting Center: Foundation repair permit
- Texas State Historical Association, Handbook of Texas: Brazoria County (Diana J. Kleiner)
- Wikipedia: Alvin, Texas
- Wikipedia: Friendswood, Texas
Reviewed October 7, 2026. Rules, prices and contacts change, so check the source before relying on it.
Questions and answers
What is the 50 percent rule in Pearland?
In Pearland's 2018 substantial damage letter, a structure is substantially damaged when repair costs equal or exceed 50 percent of its value, using the Brazoria County Appraisal District's value. Substantially damaged homes must raise the lowest floor 12 inches above base flood elevation.
Does foundation repair count toward flood rules?
Cities look at the cost of work on homes in floodplains. Houston's foundation repair permit asks for a sealed cost estimate or contract and an appraisal in flood zones. Ask Pearland's floodplain staff how they treat your repair.
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