Attic insulation cost in St. Louis, MO
Local estimate from BLS wage data and BEA price levels. Reviewed Nov 4, 2026.
- Typical range (1,000 sq ft)
- $1,100 – $4,300
- Per sq ft
- $1.10 – $4.30
- before permit
- Versus US midpoint
- +8%
- US $2,500
- Rank of 300 metros
- #28
- 1 = most expensive
If you want to insulate an attic in St. Louis, plan on $1,100 to $4,300 for 1,000 sq ft, all in. Per sq ft, that is $1.10 to $4.30 for materials and labor, with the permit on top. The local midpoint runs 8% higher than the national one. Insulation workers, floor, ceiling and wall earn a median of $28.39 an hour in the St. Louis area, 20% above the US median of $23.62.
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Estimated cost for 1,000 sq ft in St. Louis, MO, standard level
$2,050 to $3,350
About $2.05 to $3.35 per sq ft before permits. Labor is about 41% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $1,150 | $2,050 |
| Labor | $910 | $1,300 |
| Permits and fees | $0 | $0 |
| Total | $2,050 | $3,350 |
Cost breakdown for 1,000 sq ft in St. Louis, MO
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $500 | $1,600 | $2,700 | 59% |
| Labor | $620 | $1,100 | $1,600 | 41% |
| Permits and fees | $0 | $0 | $0 | 0% |
| Total | $1,100 | $2,700 | $4,300 | 100% |
Where the St. Louis price comes from
Labor is 41% 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 St. Louis the blended ratio comes out at 1.24.
On the materials line, the BEA goods price index for the St. Louis metro is 100.0 (US = 100). The midpoint materials bill for 1,000 sq ft comes to $1,600, compared with $1,600 at national prices. Permit and inspection fees are scaled by the broader index (95.1) and land at $0 to $0.
St. Louis against nearby metros and the rest of Missouri
Same job, same size (1,000 sq ft), priced for the nearest metros. St. Louis is the priciest of the group. Columbia is the cheapest at $2,400.
| Area | Range | Midpoint | vs. here |
|---|---|---|---|
| St. Louis, MOthis page | $1,100 – $4,300 | $2,700 | |
| Springfield, IL85 miles | $1,050 – $4,000 | $2,500 | −7% |
| Jefferson City, MO95 miles | $1,050 – $4,050 | $2,550 | −6% |
| Columbia, MO120 miles | $970 – $3,850 | $2,400 | −12% |
| Bloomington, IL145 miles | $1,050 – $4,000 | $2,500 | −8% |
| Peoria, IL150 miles | $1,050 – $4,000 | $2,500 | −7% |
| Missouri (statewide) | $1,050 – $4,100 | $2,600 | −5% |
| United States | $1,000 – $4,000 | $2,500 | −8% |
Across 300 US metros, St. Louis comes in at #28 from the top. The priciest is San Francisco, CA at $3,150; the cheapest is Morgantown, WV at $2,250 (midpoints, 1,000 sq ft). Statewide, St. Louis is 5% above the Missouri figure.
Other Missouri metros
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Kansas City, MO | 1,096,110 jobs | $1,050 – $4,000 | $2,550 | −7% |
| Springfield, MO | 223,030 jobs | $960 – $3,800 | $2,400 | −12% |
| Columbia, MO | 107,680 jobs | $970 – $3,850 | $2,400 | −12% |
| Joplin, MO | 87,190 jobs | $1,050 – $4,000 | $2,500 | −7% |
| Jefferson City, MO | 80,220 jobs | $1,050 – $4,050 | $2,550 | −6% |
Cities with a workforce like St. Louis's
Big cities and small ones price differently, so here is St. Louis against the 4 metros with the closest total employment.
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Baltimore, MD | 1,356,680 jobs | $1,150 – $4,350 | $2,750 | +1% |
| Austin, TX | 1,293,690 jobs | $960 – $3,800 | $2,400 | −12% |
| Charlotte, NC | 1,358,370 jobs | $940 – $3,800 | $2,350 | −13% |
| Portland, OR | 1,208,410 jobs | $1,150 – $4,450 | $2,800 | +3% |
Specs and site conditions that change a St. Louis bid
Type of insulation
Blown-in is $0.90-$2.40 per sq ft and loose-fill is $1.00-$2.50 installed; spray foam costs more (HomeGuide).
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.
St. Louis labor market for attic insulation
Wages are the part of this estimate that changes most from town to town. 2 trades carry the job here, and each is compared with its US median. The weighted result for St. Louis is 1.24 times the national level.
Insulation workers, floor, ceiling and wall (47-2131), 80% of the weighting: a median of $28.39 an hour, 20% above the US median of $23.62. The middle half of them earn between $24.04 and $43.45 an hour. About 520 work in the metro. That is 3.9 per 10,000 jobs, compared with 2.9 nationally, which suggests plenty of local crews to bid.
Construction laborers (47-2061), 20% of the weighting: a median of $31.01 an hour, 37% above the US median of $22.66. The middle half of them earn between $23.00 and $39.22 an hour. About 8,670 work in the metro. That is 64.6 per 10,000 jobs, compared with 70.5 nationally, so the supply of crews looks typical.
Quotes come from real crews, not medians. If the insulation workers, floor, ceiling and wall on your job are paid at the 75th percentile ($43.45 an hour) instead of the median, the labor line grows by about $460. At the 25th percentile ($24.04) it shrinks by about $130. The total moves by 16.9% or 4.9%, so wages alone rarely explain a quote that is far outside our range.
For context on the local economy, BLS counts 1,341,320 jobs in the St. Louis area. That makes it the 23rd largest of the 300 metros we cover, with 0.86% of US employment.
| Trade | Weight | 25th pct | Median | 75th pct | US median | Ratio | Level used |
|---|---|---|---|---|---|---|---|
| Insulation workers, floor, ceiling and wall (47-2131) | 80% | $24.04 | $28.39 | $43.45 | $23.62 | 1.20 | metro |
| Construction laborers (47-2061) | 20% | $23.00 | $31.01 | $39.22 | $22.66 | 1.37 | metro |
| Blended | 100% | 1.24 | |||||
Related projects, priced for St. Louis
Because every project leans on different trades, St. Louis's wage level does not move all prices equally. Against the US midpoint, vinyl siding runs +11% and window replacement +3%.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Roof replacement | 2,000 sq ft of roof | $6,550 – $13,200 | +6% |
| Metal roof | 2,000 sq ft of roof | $10,900 – $34,000 | +5% |
| Vinyl siding | 2,100 sq ft of wall | $9,350 – $28,000 | +11% |
| Window replacement | 10 windows | $4,700 – $15,400 | +3% |
| Gutters | 160 linear ft | $1,400 – $4,400 | +6% |
St. Louis: what basic, standard and premium work costs
Three bands are cut from the same cited range and localized for St. Louis wages and prices. They overlap on purpose: a good standard job and a modest premium job can cost the same. The grid below prices the same bands at 3 common sizes.
Basic
$1,100 to $2,400
Blown-in fiberglass or cellulose to code R-value
Standard
$2,050 to $3,350
Higher R-value with air sealing around fixtures
Premium
$3,050 to $4,300
Spray foam or heavy air sealing, hard-to-reach attic
| Size | Basic | Standard | Premium |
|---|---|---|---|
| small attic (600 sq ft) | $670 – $1,450 | $1,250 – $2,000 | $1,800 – $2,600 |
| average attic (1,000 sq ft) | $1,100 – $2,400 | $2,050 – $3,350 | $3,050 – $4,300 |
| large attic (1,800 sq ft) | $2,000 – $4,300 | $3,750 – $6,050 | $5,450 – $7,750 |
Get 3 local quotes
Tell us about the job and we will try to connect you with up to three local contractors for written quotes. It is free and you are under no obligation to hire. Your estimate of $2,050 to $3,350 for St. Louis, MO is attached.
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Attic insulation in St. Louis: your questions
+How much does it cost to insulate an attic in St. Louis?
For 1,000 sq ft, expect $1,100 to $4,300 in the St. Louis area. A standard-spec job lands at $2,050 to $3,350. Small jobs usually cost more per sq ft and large ones less.
+What is the price per sq ft for attic insulation in St. Louis?
About $1.10 to $4.30 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 St. Louis or Springfield?
Springfield is 85 miles away. The midpoint for 1,000 sq ft there is $2,500, which is 7% less than St. Louis ($2,700). Wage and materials indexes both feed that gap.
+How much of the bill is labor in St. Louis?
About 41% at the midpoint, or $1,100 out of $2,700. Materials are 59% and permits 0%. Nationally, labor is 36%.
+What would average attic (1,000 sq ft) cost in St. Louis?
$1,100 to $4,300. Pick a different size in the estimator above to get your own number.
+Does attic insulation need a permit in St. Louis?
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 St. Louis area (our national range of $0 to $0 scaled by the local price level).
+Is St. Louis expensive for attic insulation compared with the rest of Missouri?
St. Louis is 5% above the Missouri statewide estimate ($2,600 at the midpoint). We cover 6 metros in Missouri; see the state page to compare them.
+What do insulation workers, floor, ceiling and wall earn in St. Louis?
The BLS median is $28.39 an hour in the St. Louis area, compared with $23.62 nationally. The 25th to 75th percentile range is $24.04 to $43.45.
+What do basic and premium attic insulation work cost in St. Louis?
For 1,000 sq ft, basic work runs $1,100 to $2,400 and premium work $3,050 to $4,300. 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 St. Louis
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.