Attic insulation cost in Charleston, SC
Local estimate from BLS wage data and BEA price levels. Reviewed Nov 4, 2026.
- Typical range (1,000 sq ft)
- $900 – $3,700
- Per sq ft
- $0.90 – $3.70
- before permit
- Versus US midpoint
- −8%
- US $2,500
- Rank of 300 metros
- #285
- 1 = most expensive
Local price for attic insulation in the Charleston area: $900 to $3,700 for 1,000 sq ft. The low end is a basic job on easy ground; the high end is a premium spec with harder access. The midpoint runs 8% lower than the US figure. Insulation workers, floor, ceiling and wall earn a median of $19.29 an hour in the Charleston area, 18% below the US median of $23.62.
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Estimated cost for 1,000 sq ft in Charleston, SC, standard level
$1,750 to $2,850
About $1.75 to $2.85 per sq ft before permits. Labor is about 33% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $1,100 | $1,950 |
| Labor | $620 | $890 |
| Permits and fees | $0 | $0 |
| Total | $1,750 | $2,850 |
Cost breakdown for 1,000 sq ft in Charleston, SC
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $480 | $1,550 | $2,600 | 67% |
| Labor | $420 | $750 | $1,100 | 33% |
| Permits and fees | $0 | $0 | $0 | 0% |
| Total | $900 | $2,300 | $3,700 | 100% |
Where the Charleston price comes from
Labor is 33% of the midpoint bill here, against 36% nationally. The mix of trades behind this job is insulation workers, floor, ceiling and wall (80%), construction laborers (20%). We weight each trade's local median wage by that share and compare it with the national median. In Charleston the blended ratio comes out at 0.84.
Materials are scaled with BEA's regional price parity for goods. Charleston is at 96.3 against 100 for the US, so a materials line of $1,600 nationally becomes $1,550 here (midpoint, 1,000 sq ft). Permits follow the all-items index of 101.0: $0 to $0.
Attic insulation: what moves the price in Charleston
Job size
Small attics start around $500 and large ones go up to $6,000 (HomeGuide).
Air sealing and fixture damming
Sealing gaps and damming around recessed lights are part of what moves the price within a type.
Removing old insulation
Old, wet or pest-damaged insulation has to come out first, at extra cost.
Planning more than one job in Charleston?
Jobs that often go together with attic insulation are priced below at their usual sizes, using the same Charleston wage and price inputs. Compared with national midpoints, gutters comes out highest (−5%) and roof replacement lowest (−9%); the gap comes from the trades each job uses.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Roof replacement | 2,000 sq ft of roof | $5,500 – $11,400 | −9% |
| Metal roof | 2,000 sq ft of roof | $9,200 – $30,200 | −8% |
| Vinyl siding | 2,100 sq ft of wall | $7,700 – $23,100 | −8% |
| Window replacement | 10 windows | $4,200 – $14,100 | −6% |
| Gutters | 160 linear ft | $1,200 – $4,000 | −5% |
How Charleston compares
Same job, same size (1,000 sq ft), priced for the nearest metros. Columbia is the priciest of the group at $2,450.
| Area | Range | Midpoint | vs. here |
|---|---|---|---|
| Charleston, SCthis page | $900 – $3,700 | $2,300 | |
| Hilton Head, SC65 miles | $960 – $3,850 | $2,400 | +5% |
| Florence, SC80 miles | $960 – $3,850 | $2,400 | +5% |
| Myrtle Beach, SC85 miles | $950 – $3,800 | $2,400 | +4% |
| Columbia, SC95 miles | $990 – $3,900 | $2,450 | +7% |
| Savannah, GA95 miles | $920 – $3,750 | $2,350 | +1% |
| South Carolina (statewide) | $960 – $3,850 | $2,400 | +4% |
| United States | $1,000 – $4,000 | $2,500 | +9% |
Out of the 300 metros we cover, Charleston ranks #285 for the cost of this job (#1 is the most expensive). Statewide, Charleston is 4% below the South Carolina figure.
Elsewhere in South Carolina
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Greenville, SC | 434,900 jobs | $960 – $3,850 | $2,400 | +5% |
| Columbia, SC | 394,200 jobs | $990 – $3,900 | $2,450 | +7% |
| Spartanburg, SC | 165,150 jobs | $950 – $3,850 | $2,400 | +4% |
| Myrtle Beach, SC | 146,260 jobs | $950 – $3,800 | $2,400 | +4% |
| Florence, SC | 89,060 jobs | $960 – $3,850 | $2,400 | +5% |
| Hilton Head, SC | 81,920 jobs | $960 – $3,850 | $2,400 | +5% |
Metros of a similar size
Big cities and small ones price differently, so here is Charleston against the 4 metros with the closest total employment.
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Columbia, SC | 394,200 jobs | $990 – $3,900 | $2,450 | +7% |
| Boise, ID | 391,790 jobs | $920 – $3,750 | $2,350 | +1% |
| Des Moines, IA | 404,130 jobs | $1,150 – $4,300 | $2,700 | +19% |
| Tucson, AZ | 389,630 jobs | $920 – $3,750 | $2,350 | +1% |
Charleston: what basic, standard and premium work costs
The cited range is split into basic, standard and premium bands, then scaled to Charleston. Bands overlap, because plenty of standard jobs cost as much as a light premium one. Sizes run from small attic (600 sq ft) to large attic (1,800 sq ft).
Basic
$900 to $2,000
Blown-in fiberglass or cellulose to code R-value
Standard
$1,750 to $2,850
Higher R-value with air sealing around fixtures
Premium
$2,600 to $3,700
Spray foam or heavy air sealing, hard-to-reach attic
| Size | Basic | Standard | Premium |
|---|---|---|---|
| small attic (600 sq ft) | $540 – $1,200 | $1,050 – $1,700 | $1,550 – $2,200 |
| average attic (1,000 sq ft) | $900 – $2,000 | $1,750 – $2,850 | $2,600 – $3,700 |
| large attic (1,800 sq ft) | $1,600 – $3,650 | $3,150 – $5,150 | $4,650 – $6,650 |
Who does the work: Charleston trade wages
The labor line is built from BLS wage data, one trade at a time. This job draws on 2 trades. We compare each trade's local median with the US median, weight the ratios by how much of the job each trade does, and apply the blend to the national labor cost. For Charleston the blend is 0.84.
For insulation workers, floor, ceiling and wall (47-2131, weighted 80%) the local median is $19.29 an hour, which is 18% below the national $23.62. The middle half of them earn between $14.18 and $22.93 an hour. BLS counts 180 of them working in the area, 4.6 for every 10,000 jobs (US: 2.9), so the local bench is deeper than average.
For construction laborers (47-2061, weighted 20%) the local median is $20.98 an hour, which is 7% below the national $22.66. The middle half of them earn between $18.00 and $24.49 an hour. BLS counts 3,710 of them working in the area, 94.1 for every 10,000 jobs (US: 70.5), so the local bench is deeper than average.
A quick sensitivity check: moving the lead trade (insulation workers, floor, ceiling and wall) from the median to the 75th percentile wage adds about $110 to the midpoint estimate; the 25th percentile takes off about $160. That is a swing of roughly 6.8% to 4.8% of the total, which is useful for judging whether a bid reflects wages or something else, such as scope or margin.
Charleston-North Charleston has 394,170 jobs in total (BLS, May 2025), ranking 66th by size among the 300 metros on this site.
| Trade | Weight | 25th pct | Median | 75th pct | US median | Ratio | Level used |
|---|---|---|---|---|---|---|---|
| Insulation workers, floor, ceiling and wall (47-2131) | 80% | $14.18 | $19.29 | $22.93 | $23.62 | 0.82 | metro |
| Construction laborers (47-2061) | 20% | $18.00 | $20.98 | $24.49 | $22.66 | 0.93 | metro |
| Blended | 100% | 0.84 | |||||
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Attic insulation in Charleston: your questions
+How much does it cost to insulate an attic in Charleston?
For 1,000 sq ft, expect $900 to $3,700 in the Charleston area. A standard-spec job lands at $1,750 to $2,850. Small jobs usually cost more per sq ft and large ones less.
+What is the price per sq ft for attic insulation in Charleston?
About $0.90 to $3.70 per sq ft for materials and labor, plus $0 to $0 for the permit if one is needed. The US range is $1 to $4.
+Is attic insulation cheaper in Charleston or Hilton Head?
Hilton Head is 65 miles away. The midpoint for 1,000 sq ft there is $2,400, which is 5% more than Charleston ($2,300). Wage and materials indexes both feed that gap.
+How much of the bill is labor in Charleston?
About 33% at the midpoint, or $750 out of $2,300. Materials are 67% and permits 0%. Nationally, labor is 36%.
+What would average attic (1,000 sq ft) cost in Charleston?
$900 to $3,700. Pick a different size in the estimator above to get your own number.
+Does attic insulation need a permit in Charleston?
Often, but rules are set by your city or county building office, so call before you hire. Budget $0 to $0 for fees in the Charleston area (our national range of $0 to $0 scaled by the local price level).
+Is Charleston expensive for attic insulation compared with the rest of South Carolina?
Charleston is 4% below the South Carolina statewide estimate ($2,400 at the midpoint). We cover 7 metros in South Carolina; see the state page to compare them.
+What do insulation workers, floor, ceiling and wall earn in Charleston?
The BLS median is $19.29 an hour in the Charleston area, compared with $23.62 nationally. The 25th to 75th percentile range is $14.18 to $22.93.
+What do basic and premium attic insulation work cost in Charleston?
For 1,000 sq ft, basic work runs $900 to $2,000 and premium work $2,600 to $3,700. Basic means: blown-in fiberglass or cellulose to code R-value. Premium means: spray foam or heavy air sealing, hard-to-reach attic.
Attic insulation near Charleston
Where these numbers come from
Base prices are national ranges from the sources below. We scale labor by local BLS wages, materials by BEA goods prices and permits by the BEA all-items price level. Full method on the methodology page.
- HomeGuide: How Much Does Attic Insulation Cost? (2026) (accessed November 4, 2026)
- BLS Occupational Employment and Wage Statistics, May 2025
- BEA Regional Price Parities, 2024
Note on derived figures: Materials = installed price minus HomeGuide's $0.50-$1.30 per sq ft insulation labor, matched low-to-low and high-to-high.