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Attic Insulation Upgrade Cost in Idaho (2026)

Attic insulation upgrades in Idaho typically run $1,700–$5,800 for a 1,500 sq ft attic upgrade R-30 to R-49 blown cellulose, with blown fiberglass loose-fill the dominant residential retrofit material at the IECC R-49 attic minimum. Idaho's combination of 6,400 annual heating degree days, 36-inch frost depth, and high-altitude UV exposure across the Wood River Valley and Boise foothills drives heating-dominant insulation upgrades statewide — R-49 blown-fiberglass attic plus R-20 wall cavity insulation plus continuous polyiso exterior on retrofits is now the dominant Idaho spec, with mountain-elevation Sun Valley and McCall additionally requiring R-60 attic upgrades and triple-pane glazing on every premium ski-town residential retrofit to manage extreme winter heating costs above $400/month.

State Idaho
Cities Covered 8
Typical 1,500 sq ft attic upgrade R-30 to R-49 blown cellulose $1,700 – $5,800
BLS insulation worker wage $19.42/hr

Idaho energy code & climate-load drivers

  • IECC climate zone: 5B-6B
  • 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: 6,400 HDD / 600 CDD
  • Vapor barrier requirement: Warm-side vapor retarder required (typical IECC zones 5+)
  • Dominant attic insulation material: Blown fiberglass loose-fill — dominant in cooling-dominant Sun Belt
  • IRA HOMES + HEER rebate status: Planning — IRA implementation plan filed with DOE, rebates pending state legislature

Idaho licensing, rebates & permits

  • License status: Statewide registration required (no exam)
  • License board: Idaho Division of Occupational and Professional Licenses — Contractor Registration (official site)
  • Permit: permit not typical for attic insulation retrofit on existing residential; Idaho Contractor Registration required statewide

How attic insulation upgrade costs vary in Idaho

State-specific code or insurance rule: Idaho Code §39-4116 created the Idaho Building Code Board with statewide preemption authority over every municipal energy code amendment — Idaho explicitly blocks Boise, Moscow, Sun Valley, and Coeur d'Alene from adopting above-baseline residential energy codes, and Idaho remains on the IECC 2018 cycle pending the Idaho Building Code Board IECC 2024 review, leaving Idaho one of the slowest-adopting Mountain West states for residential energy code updates.

Cities in Idaho

Compare attic insulation upgrade pricing for 8 cities across Idaho.

Boise City, ID

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Caldwell, ID

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Coeur Dalene, ID

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Idaho Falls, ID

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Meridian, ID

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Nampa, ID

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Pocatello, ID

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Twin Falls, ID

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Pricing ranges reflect Idaho market labor (BLS OEWS insulation worker (floor/ceiling/wall) mean $19.42/hr) and Woogoro regional cost modeling. For the most localized estimate, see your nearest city page above.