All cities with insulation cost data

738 U.S. cities across 50 states · data updated 2026

Insulation cost is fundamentally a target-R-value question by IECC climate zone — Zone 7 (northern Maine, Minnesota, Mountain West) demands R-49+ in attics where Zone 2 (Florida, coastal TX) gets to R-30. Material choice layers on top: blown-in cellulose runs $1.50–$2.50 per square foot at R-30; fiberglass batts run $1–$2; closed-cell spray foam runs $4–$7 with the air-seal benefit baked in. Wall-vs-attic-vs-rim-joist matters a lot — wall retrofit through dense-pack drilling is 2–3x the linear cost of an open attic blow. The IRA 25C tax credit (30% up to $1,200) lands per project, so per-job effective price drops materially. The per-metro pages cover IECC climate zone, dominant install method, target R-value, and the IRA-25C plus state-rebate stack that lands per project.

Related: Insulation Cost Guide · All cities (cross-vertical) · Analyze an insulation quote