Insulation Contractors in North Dakota: Attic, Air Sealing & Energy Audits
Find insulation and energy audit contractors in North Dakota. We've gathered 8 contractors from across North Dakota with their phone number, address, hours, and Google rating, so you can compare and reach out for quotes. Listings span West Fargo, Williston, Bismarck, Minot, Grand Forks and Fargo, so there's likely a contractor near you. The contractors below average 4.6 stars on Google. ENERGY STAR estimates that air sealing plus attic and basement insulation cuts total energy costs by about 11%; on North Dakota's average $118 monthly electric bill that is roughly $156 a year on electricity alone, before any gas or oil heating savings.
Before you hire in North Dakota: see where the energy goes
North Dakota at a glance
- 11.5¢
- per kWh, residential
- $118.38
- average monthly bill
- 1,029 kWh
- average monthly use
- $156.26
- a year from air sealing + insulation
#51 most expensive of 51
EIA, 2024 annual avg
EIA, 2024 annual avg
ENERGY STAR: ~11% of total energy costs, applied to the electric bill
8 insulation and energy audit contractors in North Dakota
Spread across North Dakota so there's likely one near you. Enter your ZIP above to sort nearest-first. Details from public Google Business Profiles: verify before hiring.
How to choose an insulation contractor in North Dakota
Audit first, with a blower-door test
A home energy audit (look for BPI or RESNET credentials) uses a blower door and often an infrared camera to find where North Dakota air is actually leaking and which assemblies are thin. The report gives you a prioritized scope, which is what you hand to insulation contractors so every quote prices the same job. Many North Dakota utilities subsidize audits; ask yours before paying full price.
Air seal before you insulate
Insulation slows heat flow; it does not stop air leaks, and air leakage through the attic floor, top plates, recessed lights, and the rim joist is usually the bigger loss. A good quote lists the air sealing it includes (and the material: foam, caulk, rigid covers over can lights), keeps attic ventilation and bath-fan ducts clear, and checks that combustion appliances still draft safely after the house is tightened.
Compare quotes on R-value, material, and coverage
Each quote should state the material (blown cellulose or fiberglass, batts, open- or closed-cell spray foam), the R-value being added and the final target for your DOE climate zone, the square footage, the depth markers used to verify coverage, and whether old insulation is removed. Ask for proof of liability insurance, any general contractor license your state requires, and a written warranty against settling.
What to know before hiring in North Dakota
The largest utilities serving North Dakota homes are Northern States Power Co - Minnesota (82,987 residential customers, 12.1¢/kWh), Montana-Dakota Utilities (79,354 residential customers, 11.7¢/kWh) and Cass County Elec Coop (51,968 residential customers, 12.4¢/kWh). Your utility sets the rate your insulation savings come off, and it is also who an installer files interconnection or service paperwork with, so name it when you ask for quotes.
Check the license before you sign
Insulation itself is not electrical work, but junction boxes, recessed-light covers, and attic fans in the work area are: Electrical contractors in North Dakota are licensed by the North Dakota State Electrical Board. Master, Journeyman and Class B electrician licenses plus electrical contractor licenses.
Look up a licenseBoard siteLinks checked 2026-10-19
Listing data is sourced from public Google Business Profiles and may be out of date. WattSimple is not affiliated with, and does not endorse or recommend, any listed company. Verify licensing and details directly before hiring.
Other energy pros in North Dakota
Frequently asked questions
Plan your insulation project
See how your home compares and where to spend first.
Electricity bill estimatorModel your bill before and after upgrades.
Average electric bill in North DakotaWhat North Dakota homes pay and use each month.
Attic insulation R-value guideTargets by climate zone and how to measure what you have.
How to air seal a houseWhere the leaks are and what closes them.
Get an energy audit firstWhy the audit comes before the heat pump.
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