How to Choose a Crawl Space Contractor

Crawl space work involves the code, a permit, and usually mechanical or electrical equipment. Check the licenses that apply, ask specific questions, and get everything in writing. This page doesn't recommend any company.

A woman and a man in work clothes reading printed plans together inside a house under construction

Check the license

General contractor license. The NC Licensing Board for General Contractors (NCLBGC) says a general contractor must be state-licensed if the total project is valued at $40,000 or more. Look up any license on the Board's official Verify License Search.
Mechanical and electrical work. OSFM says every closed crawl space drying method adds or changes mechanical or electrical equipment. Ask who will do that work and under which license.
The permit lists contractors. Cary requires all contractors' names, addresses and state license numbers on the application and verifies licenses during plan review. Raleigh requires all contractor and subcontractor information in its permit portal. Durham's Renovations checklist says applications without a designated contractor may be rejected. See the Durham page.

Questions to ask

Will you pull the permit? Which inspections will it include, and when?
What did you find? Can I see photos and moisture readings?
Which drying method are you proposing, and why for my house?
Where will water drain: to daylight or to a sump pump?
Will the liner cover walls and piers, and how will you leave the termite inspection gap?
Are you insulating the floor or the walls?
How will gas appliances in the crawl space get outdoor combustion air?
Do you carry liability insurance and workers' compensation? Can I see the certificates? (A question worth asking. This page doesn't state an insurance requirement.)

These follow from NC's closed crawl space rules. See how encapsulation works.

Written estimates

Ask for the scope in writing:

square footage
liner type and thickness
wall and pier coverage
drainage work
the drying method and where its water goes
insulation
the permit
what's excluded

Compare estimates line by line. For what drives the price, see the cost factors guide.

Warranty terms to read

Get any warranty in writing before you sign, and check:

What's covered: materials, labor, the dehumidifier or other equipment, water entry
How long it lasts, and whether it transfers if you sell
What maintenance or service keeps it valid
What voids it, and how to make a claim

Red flags

Suggesting you skip the permit. OSFM says converting to a closed crawl space needs a permit regardless of cost. Raleigh lists citations, fines, required removal of work and insurance problems as risks of unpermitted work.
No license number on a job valued at $40,000 or more, or a number that doesn't show up on the NCLBGC search.
No written scope or estimate.
A plan that skips the basics: water problems, or the mechanical drying the code requires for a closed crawl space.

Keep reading

Raleigh Crawl Space Guide is an independent informational and referral site about crawl spaces in Raleigh, Cary and Durham, NC. It does not perform crawl space work and is not a contractor. It's general information, not professional advice. Confirm code and permit requirements with your local inspections office.

Sources: NCLBGC · NCLBGC Verify License Search · NC OSFM interpretation 106.1 · Town of Cary permit FAQ · City of Raleigh residential permits · Durham Renovations Checklist · NC Residential Code R409 (2018), via Johnston County

Last reviewed: 2026-10-27