Hiring an excavation contractor in New Hampshire
Gradeline lists 509 excavating and site work contractors in New Hampshire across 10 counties. This guide covers the New Hampshire rules that affect a dig: frost depth and 811 notice through Dig Safe New Hampshire.
What to know before you hire in New Hampshire
4.7★
Know what a good rating looks like here
New Hampshire contractors average 4.7 stars on Google. Shortlist crews at 4.5 or better with a solid review count (110 qualify), and treat anything under 4.0 as a red flag.
48 in
Footings go below the frost line
Frost reaches about 48 inches in New Hampshire. Any bid for footings, foundations, or buried lines should dig at least that deep. If the depth is not written in the quote, ask.
2 days
Utilities get marked before digging
New Hampshire law requires 2 business days notice to 811 (Dig Safe New Hampshire) before any digging. Ask whether your contractor files the request, and plan the start date around the wait.
38%
Most listed contractors have no website
Only 38% of listed New Hampshire contractors run their own site. Judge them on reviews, photos, and years in business rather than web polish, and get at least three written quotes.
Get quotes from New Hampshire contractors in one request.
Get free quotesArea-specific FAQ
How far in advance do I need to call before digging in New Hampshire?
At least 2 working days. Dig Safe New Hampshire takes locate requests statewide and has underground utilities marked before any excavation. Hitting an unmarked gas or power line can injure the crew and lead to costly repairs.
How deep do footings need to be in New Hampshire?
In New Hampshire, footings typically need to extend below the frost line, which is around 48 inches here. A local contractor will confirm the code requirement for your site.
When is the best time of year to dig in New Hampshire?
The frost line in New Hampshire is around 48 inches, so the ground freezes hard in winter. Most digging happens from spring through fall, once the thaw dries sites out.
