Insulation cost guides
Home insulation — attic insulation and spray foam, sized to your climate. Pick any project for a city-specific 2026 cost estimate.
- Attic InsulationInsulating an attic to cut heating and cooling loss — blown-in, batt or spray foam.National range$1,500 – $6,000
- Spray Foam InsulationSpray foam insulation (open- or closed-cell) for high R-value and air sealing.National range$1,500 – $6,000
Often paired with Insulation
Cheapest time for insulation work
Fall is when everyone rushes to insulate before winter hits, making it the busiest and priciest season. Spring and summer see far less demand — and utility rebate budgets are often still full that early in the year.
Insulation cost questions
How much do insulation projects cost?
Insulation costs span $1,500–$6,000 nationally in 2026, depending heavily on project and location. Attic Insulation sits at the low end, Spray Foam Insulation at the high end — pick a project below to see your city's number.
What affects insulation costs the most?
Three factors drive most of the variation: local labor rates, your climate zone and permit fees. Each estimate here accounts for all three, rather than relying on a single national average.
When is the cheapest time for insulation work?
The best window is spring and summer, when demand drops and installers discount — typically 5–10% off peak pricing. Avoid the pre-winter fall rush.