8 counties mapped. On average, 2% of New Hampshire county soil area is high shrink-swell clay (USDA SSURGO).
Foundation problems get more expensive the longer they wait. Get an assessment and repair quotes from independent local pros.
Get repair quotes →| County | Tier | High-risk % | Moderate % |
|---|---|---|---|
| Cheshire | Low | 4% | 0% |
| Hillsborough | Low | 3% | 0% |
| Carroll | Low | 2% | 0% |
| Sullivan | Low | 2% | 0% |
| Grafton | Low | 1% | 0% |
| Rockingham | Low | 1% | 5% |
| Strafford | Low | 1% | 10% |
| Coos | Low | 0% | 0% |
Risk metrics are computed from USDA SSURGO soil survey data (linear extensibility of soil components, area-weighted by county). Soil varies lot to lot — this is county-scale context, not a substitute for a site-specific geotechnical or structural assessment.