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Attic Insulation Upgrade Cost in South Carolina (2026)

Attic insulation upgrades in South Carolina typically run $1,500–$5,400 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-38 attic minimum. South Carolina's combination of 2,700 annual heating degree days, 2,100 cooling degree days, and persistent Atlantic salt-spray on the Lowcountry from Charleston to Hilton Head creates a balanced heating-cooling insulation profile — and South Carolina's hurricane-zone homes additionally require NOA-approved insulation product fastening schedules and continuous Tyvek-wrapped wall cavity barriers on every coastal South Carolina home, with Charleston historic-district insulation retrofits restricted to concealed installation methods preserving original masonry exterior.

State South Carolina
Cities Covered 13
Typical 1,500 sq ft attic upgrade R-30 to R-49 blown cellulose $1,500 – $5,400
BLS insulation worker wage $18.42/hr

South Carolina energy code & climate-load drivers

  • IECC climate zone: 3A-4A
  • Required attic R-value: R-38 (IECC 2021 prescriptive minimum)
  • Required wall R-value: R-13 (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: 2,700 HDD / 2,100 CDD
  • Vapor barrier requirement: No statewide vapor retarder rule — climate zone determines
  • 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

South Carolina licensing, rebates & permits

  • License status: Statewide license required
  • License board: South Carolina Department of Labor, Licensing and Regulation — Residential Specialty (official site)
  • Permit: permit required for attic insulation retrofit per South Carolina Energy Conservation Code; SC LLR residential license required above $5,000 contract

How attic insulation upgrade costs vary in South Carolina

State-specific code or insurance rule: South Carolina Code §6-9-50 makes the South Carolina Building Codes Council the statewide energy code authority — South Carolina adopted IECC 2018 effective 2020 statewide, and the South Carolina Energy Office is the planned IRA HOMES + HEER administrator pending 2026 launch with Duke Energy Progress and Dominion Energy South Carolina residential weatherization programs providing the current statewide rebate channel for residential insulation upgrades.

Cities in South Carolina

Compare attic insulation upgrade pricing for 13 cities across South Carolina.

Charleston, SC

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Columbia, SC

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Florence, SC

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Fort Mill, SC

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Goose Creek, SC

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Greenville, SC

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Hilton Head Island, SC

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Mount Pleasant, SC

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North Charleston, SC

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Rock Hill, SC

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Spartanburg, SC

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Summerville, SC

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Sumter, SC

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Pricing ranges reflect South Carolina market labor (BLS OEWS insulation worker (floor/ceiling/wall) mean $18.42/hr) and Woogoro regional cost modeling. For the most localized estimate, see your nearest city page above.