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Attic Insulation Upgrade Cost in New Hampshire (2026)

Attic insulation upgrades in New Hampshire typically run $1,900–$7,200 for a 1,500 sq ft attic upgrade R-30 to R-49 blown cellulose, with blown cellulose loose-fill the dominant residential retrofit material at the IECC R-49 attic minimum. New Hampshire's combination of 7,100 annual heating degree days, -25°F winter low temperatures across interior climate zones 5A-6A, and 48-inch frost depth drives heating-dominant insulation upgrades statewide — and New Hampshire's high concentration of pre-1900 wood-frame housing stock in Manchester, Concord, Nashua, and Portsmouth requires combination air-sealing + dense-pack cellulose wall cavity + blown-cellulose attic upgrades on the majority of urban New Hampshire insulation retrofit scope, with knob-and-tube wiring removal additionally required on the majority of pre-1950 retrofits.

State New Hampshire
Cities Covered 3
Typical 1,500 sq ft attic upgrade R-30 to R-49 blown cellulose $1,900 – $7,200
BLS insulation worker wage $21.42/hr

New Hampshire energy code & climate-load drivers

  • IECC climate zone: 5A-6A
  • Required attic R-value: R-49 (IECC 2021 prescriptive minimum)
  • Required wall R-value: R-20 (above-grade wood-frame)
  • Adopted energy code basis: IECC 2018 — prior cycle, R-49 attic + R-20 wall, advisory air-sealing
  • Stretch code available: No — IECC base code only
  • Annual heating + cooling load: 7,100 HDD / 500 CDD
  • Vapor barrier requirement: Warm-side vapor retarder required (typical IECC zones 5+)
  • Dominant attic insulation material: Blown cellulose loose-fill — dominant in heating-dominant Northeast and Upper Midwest
  • IRA HOMES + HEER rebate status: Planning — IRA implementation plan filed with DOE, rebates pending state legislature

New Hampshire licensing, rebates & permits

  • License status: No statewide trade license
  • License board: No statewide insulation license; New Hampshire Saves administers utility-funded weatherization rebates (official site)
  • Permit: permit required for attic insulation retrofit per New Hampshire State Energy Code (RSA 155-D)

How attic insulation upgrade costs vary in New Hampshire

State-specific code or insurance rule: New Hampshire RSA 155-D imposes the New Hampshire State Energy Code statewide — New Hampshire operates under IECC 2018 with mandatory blower-door testing on every new residential construction, and NHSaves administers the utility-funded New Hampshire Home Performance with ENERGY STAR program through Eversource, Liberty Utilities, NH Electric Co-op, and Unitil providing residential insulation rebates that are the planned base layer for IRA HOMES + HEER funding pending New Hampshire Department of Energy IRA implementation in 2026.

Cities in New Hampshire

Compare attic insulation upgrade pricing for 3 cities across New Hampshire.

Concord, NH

Compare local attic insulation upgrade pricing in Concord.

Manchester, NH

Compare local attic insulation upgrade pricing in Manchester.

Nashua, NH

Compare local attic insulation upgrade pricing in Nashua.

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Pricing ranges reflect New Hampshire market labor (BLS OEWS insulation worker (floor/ceiling/wall) mean $21.42/hr) and Woogoro regional cost modeling. For the most localized estimate, see your nearest city page above.