Onslow County, NC Shrink-Swell Risk

Onslow County's SSURGO shrink-swell reading

Low

In Onslow County, NC, 96.1% of the surveyed soil carries a "Low" shrink-swell rating, 1.58% linear extensibility on average. That's as favorable a county-level reading as this dataset produces - standard foundation practice, pending one lot's own geotechnical report.

Before you rely on this for one address

Onslow County's reading is an average across the whole county, not a promise about any one lot inside it. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).

Budgeting for Onslow County, NC

Onslow County's soil reading points toward standard foundation practice as the likely outcome, not the exception. 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

Among the 3,085 rated counties on this site, Onslow County, NC ranks 2,399 most-constrained nationally, and 62 of 100 within North Carolina. Onslow County covers 762 square miles and counts 212,954 residents.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Letcher County, KY and Boyle County, KY 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

Elsewhere in North Carolina

Every county in North Carolina is on this site, including Northampton County, NC and Davie County, NC. The full underlying dataset is downloadable directly, one row per county.