Insulation Contractors
Compare 479 insulation contractors across 51 states — averaging 4.9★ from 77,924 verified Google reviews. Pick your state to see local firms with ratings, service areas, and licensing rules. No lead fees.
Insulation contractors install batts, blown-in, spray foam, and rigid insulation to cut energy loss. Costs run $1 to $4 per square foot depending on material, with spray foam the priciest; the payback comes from lower heating and cooling bills and often utility rebates.
Insulation Contractors by State
How to Hire Insulation Contractors in 2026
Ask them to identify the biggest losses first, usually the attic and air sealing, since insulation without air sealing underperforms. Confirm R-values meet or exceed code for your climate zone, and ask about ventilation so you do not trap moisture. For spray foam, confirm proper installation and cure, as poor application causes odor and off-gassing.
Get a written scope with the material, R-value, square footage, and air-sealing work. Ask about available utility and federal energy rebates, which can offset a real share of the cost. A blower-door test before and after quantifies the improvement and confirms the work was done right.
Insulation Contractors FAQs
How much does insulation cost?
Insulation runs about $1 to $4 per square foot installed. Blown-in and batt insulation are at the lower end; closed-cell spray foam is the most expensive at $3 to $7 per board foot. Insulating an attic typically costs $1,500 to $4,000, with whole-home projects running higher.
Do insulation contractors need a license?
Most states do not require a standalone insulation license, though some cover it under a general or specialty contractor license. Spray-foam work benefits from manufacturer-trained installers. Confirm insurance and ask about proper ventilation and moisture control regardless of licensing.
What R-value do I need?
It depends on your climate zone and where the insulation goes. Attics commonly call for R-38 to R-60, and walls R-13 to R-21, per current energy code. A contractor should specify R-values that meet or exceed code for your zone; more is generally better in the attic, the biggest source of loss.
Is spray foam worth the extra cost?
Spray foam costs more but air-seals and insulates in one step, delivering high R-value per inch and strong performance in tricky spots. For attics and rim joists it is often worth it; for open, accessible areas, blown-in or batts may deliver similar results for less. Weigh it against rebates and energy savings.
Directory refreshed April 2026. Listings sourced from public business data; confirm licensing and insurance directly with each firm.