Gwinnett County, GA Shrink-Swell Risk

What Gwinnett County, GA's soil means for a foundation

Low

USDA's SSURGO data puts Gwinnett County, GA's soil at "Low" shrink-swell potential, an area-weighted linear extensibility of 1.69% across 91.9% of the county's surveyed land. That's the easiest starting point on this site's scale - a standard foundation is the reasonable default here, though any one lot can still differ.

This is a county figure, not a lot figure

USDA's survey covers the whole of Gwinnett County, GA at once, not any single address. A site-specific soil report, usually $1,000-$5,000, is what an engineer would actually pull before designing a foundation on a lot in Gwinnett County.

Report cost vs. repair cost

With Gwinnett County, GA rating "Low", a geotechnical report is still worthwhile before a build, just less urgent than in a high-risk county. A geotechnical report runs $1,000-$5,000, typically around $2,700. Foundation repair, if a specific lot turns out to differ from the county average, runs $5,000-$15,000.

Where this sits nationally

Nationally, Gwinnett County, GA is the 2,286-most-constrained of 3,085 rated counties for shrink-swell soil. Within Georgia alone it ranks 46 of 159. The county spans 431 square miles, home to 1,003,869 people.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Martin County, KY and Tallahatchie County, MS are worth a look for comparison.

How this reading is built, and its real limits · Moisture management: the cheap fix that works on any soil

More of Georgia

Every county in Georgia is on this site, including Fayette County, GA and Elbert County, GA. The full underlying dataset is downloadable directly, one row per county.