Grafton County, NH Shrink-Swell Risk

Grafton County's SSURGO shrink-swell reading

Low

In Grafton County, NH, 98.5% of the surveyed soil carries a "Low" shrink-swell rating, 0.81% linear extensibility on average. Among the 3,144 counties on this site, that's the clean result: little shrink-swell movement, standard construction the likely outcome.

Before you rely on this for one address

Grafton County's reading is an average across the whole county, not a promise about any one lot inside it. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Grafton County will actually do.

Budgeting for Grafton County, NH

Grafton 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.

How Grafton County, NH compares

Among the 3,085 rated counties on this site, Grafton County, NH ranks 2,978 most-constrained nationally, and 8 of 10 within New Hampshire. The county spans 1,709 square miles, home to 93,045 people.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Clatsop County, OR and Wilkinson County, GA 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 New Hampshire

Every county in New Hampshire is on this site, including Merrimack County, NH and Coos County, NH. The full underlying dataset is downloadable directly, one row per county.