Concrete slab cost in Seattle, WA
Local estimate from BLS wage data and BEA price levels. Reviewed Nov 4, 2026.
- Typical range (400 sq ft)
- $2,950 – $6,100
- Per sq ft
- $7.25 – $14
- before permit
- Versus US midpoint
- +18%
- US $3,850
- Rank of 300 metros
- #7
- 1 = most expensive
If you want to pour a concrete slab in Seattle, plan on $2,950 to $6,100 for 400 sq ft, all in. Per sq ft, that is $7.25 to $14 for materials and labor, with the permit on top. The local midpoint runs 18% higher than the national one. Cement masons and concrete finishers earn a median of $38.88 an hour in the Seattle area, 42% above the US median of $27.41.
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Estimated cost for 400 sq ft in Seattle, WA, standard level
$3,900 to $5,150
About $9.30 to $12 per sq ft before permits. Labor is about 49% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $1,750 | $2,400 |
| Labor | $2,000 | $2,400 |
| Permits and fees | $170 | $330 |
| Total | $3,900 | $5,150 |
Cost breakdown for 400 sq ft in Seattle, WA
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $1,250 | $2,100 | $2,900 | 46% |
| Labor | $1,650 | $2,200 | $2,750 | 49% |
| Permits and fees | $55 | $250 | $440 | 6% |
| Total | $2,950 | $4,550 | $6,100 | 100% |
Where the Seattle price comes from
The wage side of the estimate leans on cement masons and concrete finishers, who do 50% of the hours on a typical job. Their local median is $38.88 an hour. Add the other trades involved and the blended wage index for Seattle is 1.38 (US = 1.00), which puts labor at 49% of the total.
On the materials line, the BEA goods price index for the Seattle metro is 104.0 (US = 100). The midpoint materials bill for 400 sq ft comes to $2,100, compared with $2,000 at national prices. Permit and inspection fees are scaled by the broader index (111.1) and land at $55 to $440.
Optional extras in Seattle
Extras are quoted nationally and then scaled to Seattle by the average of the local wage index (1.38) and goods index (1.04), a factor of 1.21. Tick any of them in the estimator above to add them to your total. Treat these as planning figures: an add-on touches different trades than the main job, so the scaling is an approximation.
| Add-on | Local range |
|---|---|
| Add rebar reinforcement | $480 – $1,450 |
| Remove old concrete first | $970 – $2,900 |
What nearby projects cost in Seattle
Because every project leans on different trades, Seattle's wage level does not move all prices equally. Against the US midpoint, concrete driveway runs +27% and detached garage +17%.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Concrete driveway | 600 sq ft | $4,550 – $11,800 | +27% |
| Concrete patio | 300 sq ft | $1,450 – $4,950 | +22% |
| Detached garage | 576 sq ft | $34,000 – $68,200 | +17% |
| Stamped concrete | 400 sq ft | $3,850 – $9,700 | +21% |
| Asphalt driveway | 600 sq ft | $3,750 – $9,450 | +26% |
| Gravel driveway | 1,000 sq ft | $3,100 – $12,600 | +24% |
Seattle labor market for concrete slab
Wages are the part of this estimate that changes most from town to town. 4 trades carry the job here, and each is compared with its US median. The weighted result for Seattle is 1.38 times the national level.
For cement masons and concrete finishers (47-2051, weighted 50%) the local median is $38.88 an hour, which is 42% above the national $27.41. The middle half of them earn between $29.14 and $52.52 an hour. BLS counts 2,140 of them working in the area, 10.3 for every 10,000 jobs (US: 13.3), so the local bench is thinner than average.
Construction laborers (47-2061), 30% of the weighting: a median of $28.72 an hour, 27% above the US median of $22.66. The middle half of them earn between $23.67 and $37.03 an hour. About 13,040 work in the metro. That is 62.5 per 10,000 jobs, compared with 70.5 nationally, so the supply of crews looks typical.
For operating engineers and other construction equipment operators (47-2073, weighted 10%) the local median is $46.04 an hour, which is 60% above the national $28.78. The middle half of them earn between $36.13 and $58.78 an hour. BLS counts 4,860 of them working in the area, 23.3 for every 10,000 jobs (US: 30.7), so the local bench is thinner than average.
For carpenters (47-2031, weighted 10%) the local median is $36.74 an hour, which is 26% above the national $29.12. The middle half of them earn between $30.64 and $47.93 an hour. BLS counts 14,970 of them working in the area, 71.8 for every 10,000 jobs (US: 43.1), so the local bench is deeper than average.
Quotes come from real crews, not medians. If the cement masons and concrete finishers on your job are paid at the 75th percentile ($52.52 an hour) instead of the median, the labor line grows by about $400. At the 25th percentile ($29.14) it shrinks by about $280. The total moves by 8.8% or 6.3%, so wages alone rarely explain a quote that is far outside our range.
For context on the local economy, BLS counts 2,086,210 jobs in the Seattle-Tacoma-Bellevue area. That makes it the 13th largest of the 300 metros we cover, with 1.34% of US employment.
| Trade | Weight | 25th pct | Median | 75th pct | US median | Ratio | Level used |
|---|---|---|---|---|---|---|---|
| Cement masons and concrete finishers (47-2051) | 50% | $29.14 | $38.88 | $52.52 | $27.41 | 1.42 | metro |
| Construction laborers (47-2061) | 30% | $23.67 | $28.72 | $37.03 | $22.66 | 1.27 | metro |
| Operating engineers and other construction equipment operators (47-2073) | 10% | $36.13 | $46.04 | $58.78 | $28.78 | 1.60 | metro |
| Carpenters (47-2031) | 10% | $30.64 | $36.74 | $47.93 | $29.12 | 1.26 | metro |
| Blended | 100% | 1.38 | |||||
Climate in Seattle: timing your concrete slab job
We use NOAA's 1991-2020 climate normals for Seattle Sand Pt Wsfo (5 miles from the city center). These are 30-year monthly averages, not forecasts.
April through November is the stretch where pouring concrete runs into the fewest weather problems in Seattle (8 of 12 months). January, February, March and December have an average overnight low of 40°F or below.
The 40°F line is a deliberately cautious stand-in. The American Concrete Institute's cold-weather guide (ACI 306R-16) defines cold-weather concreting around an average daily air temperature below 40°F, which is colder than our test of an average overnight low at or below 40°F, so we flag a few extra shoulder months. In cold weather crews may need heated enclosures, insulating blankets or accelerated mixes, and those measures can raise a quote.
Seattle gets about 38 inches of precipitation in a normal year, including roughly 4 inches of snow. The wettest months are January, November and December (5.8 inches in November). Inside the workable window, July and August are the driest, at 0.8 and 1.0 inches. The station averages about 2 days a year at 90°F or above.
Does the season change the price? Probably, but we do not have a sourced seasonal price curve, so the estimator shows a year-round figure and does not adjust by month. When you collect quotes, ask whether scheduling in a slower month gets a better rate.
| Month | Avg high °F | Avg low °F | Precip (in) | For this job |
|---|---|---|---|---|
| Jan | 47 | 37 | 5.1 | Cold |
| Feb | 50 | 37 | 3.5 | Cold |
| Mar | 54 | 39 | 3.9 | Cold |
| Apr | 59 | 43 | 3.0 | Workable |
| May | 65 | 48 | 2.2 | Workable |
| Jun | 70 | 53 | 1.6 | Workable |
| Jul | 77 | 57 | 0.8 | Workable |
| Aug | 77 | 57 | 1.0 | Workable |
| Sep | 71 | 53 | 1.7 | Workable |
| Oct | 61 | 47 | 3.6 | Workable |
| Nov | 52 | 41 | 5.8 | Workable |
| Dec | 47 | 37 | 5.5 | Cold |
Concrete slab: what moves the price in Seattle
Truck and pump access
If the mixer truck can't back up to the forms, someone has to wheelbarrow it in or hire a pump. Pump or line-pump hire is typically billed per day.
Small-job minimums
Many crews have a minimum charge, so a 10x10 pad can cost more per square foot than a 20x20 slab.
Finish
A broom finish is the baseline. Stamped, stained, or exposed-aggregate finishes are priced as add-ons on top of the slab.
Cost by quality level and size in Seattle
Three bands are cut from the same cited range and localized for Seattle 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 5 common sizes.
Basic
$2,950 to $4,200
4-inch broom-finish slab, light mesh, easy truck access
Standard
$3,900 to $5,150
4-5 inch slab with rebar or heavier mesh and standard base prep
Premium
$4,850 to $6,100
6-inch slab, heavy reinforcement, thick base, pump truck or tight access
| Size | Basic | Standard | Premium |
|---|---|---|---|
| 10x10 pad (100 sq ft) | $780 – $1,200 | $1,100 – $1,550 | $1,450 – $1,850 |
| 12x12 (144 sq ft) | $1,100 – $1,650 | $1,500 – $2,050 | $1,950 – $2,500 |
| 20x20 (400 sq ft) | $2,950 – $4,200 | $3,900 – $5,150 | $4,850 – $6,100 |
| 24x24 garage floor (576 sq ft) | $4,250 – $6,000 | $5,550 – $7,300 | $6,850 – $8,600 |
| 30x40 foundation (1,200 sq ft) | $8,750 – $12,200 | $11,400 – $14,800 | $14,000 – $17,400 |
Is Seattle cheap or dear? The local comparison
Same job, same size (400 sq ft), priced for the nearest metros. Seattle is the priciest of the group. Portland is the cheapest at $4,350.
| Area | Range | Midpoint | vs. here |
|---|---|---|---|
| Seattle, WAthis page | $2,950 – $6,100 | $4,550 | |
| Bremerton, WA40 miles | $2,850 – $5,900 | $4,350 | −4% |
| Olympia, WA60 miles | $2,850 – $5,900 | $4,400 | −3% |
| Yakima, WA90 miles | $2,850 – $5,950 | $4,400 | −3% |
| Bellingham, WA95 miles | $2,900 – $6,000 | $4,450 | −2% |
| Portland, OR135 miles | $2,800 – $5,900 | $4,350 | −4% |
| Washington (statewide) | $2,850 – $5,950 | $4,400 | −2% |
| United States | $2,450 – $5,200 | $3,850 | −16% |
Across 300 US metros, Seattle comes in at #7 from the top. The priciest is Kahului, HI at $5,300; the cheapest is McAllen, TX at $3,200 (midpoints, 400 sq ft). Statewide, Seattle is 3% above the Washington figure.
Other Washington metros
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Spokane, WA | 255,820 jobs | $2,750 – $5,750 | $4,250 | −6% |
| Olympia, WA | 130,300 jobs | $2,850 – $5,900 | $4,400 | −3% |
| Kennewick, WA | 129,490 jobs | $2,850 – $5,900 | $4,350 | −4% |
| Yakima, WA | 97,010 jobs | $2,850 – $5,950 | $4,400 | −3% |
| Bremerton, WA | 93,740 jobs | $2,850 – $5,900 | $4,350 | −4% |
| Bellingham, WA | 91,390 jobs | $2,900 – $6,000 | $4,450 | −2% |
Cities with a workforce like Seattle's
Big cities and small ones price differently, so here is Seattle against the 4 metros with the closest total employment.
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| San Francisco, CA | 2,373,920 jobs | $3,150 – $6,450 | $4,800 | +6% |
| Minneapolis, MN | 1,951,650 jobs | $2,850 – $5,900 | $4,350 | −4% |
| Phoenix, AZ | 2,375,760 jobs | $2,400 – $5,100 | $3,750 | −17% |
| Detroit, MI | 1,904,530 jobs | $2,600 – $5,450 | $4,000 | −11% |
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Concrete slab in Seattle: your questions
+How much does it cost to pour a concrete slab in Seattle?
For 400 sq ft, expect $2,950 to $6,100 in the Seattle area. A standard-spec job lands at $3,900 to $5,150. Small jobs usually cost more per sq ft and large ones less.
+What is the price per sq ft for concrete slab in Seattle?
About $7.25 to $14 per sq ft for materials and labor, plus $55 to $440 for the permit if one is needed. The US range is $6 to $12.
+Is concrete slab cheaper in Seattle or Bremerton?
Bremerton is 40 miles away. The midpoint for 400 sq ft there is $4,350, which is 4% less than Seattle ($4,550). Wage and materials indexes both feed that gap.
+How much of the bill is labor in Seattle?
About 49% at the midpoint, or $2,200 out of $4,550. Materials are 46% and permits 6%. Nationally, labor is 42%.
+What would 20x20 (400 sq ft) cost in Seattle?
$2,950 to $6,100. Pick a different size in the estimator above to get your own number.
+Does concrete slab need a permit in Seattle?
Often, but rules are set by your city or county building office, so call before you hire. Budget $55 to $440 for fees in the Seattle area (our national range of $50 to $400 scaled by the local price level).
+Is Seattle expensive for concrete slab compared with the rest of Washington?
Seattle is 3% above the Washington statewide estimate ($4,400 at the midpoint). We cover 7 metros in Washington; see the state page to compare them.
+What do cement masons and concrete finishers earn in Seattle?
The BLS median is $38.88 an hour in the Seattle area, compared with $27.41 nationally. The 25th to 75th percentile range is $29.14 to $52.52.
+What do basic and premium concrete slab work cost in Seattle?
For 400 sq ft, basic work runs $2,950 to $4,200 and premium work $4,850 to $6,100. Basic means: 4-inch broom-finish slab, light mesh, easy truck access. Premium means: 6-inch slab, heavy reinforcement, thick base, pump truck or tight access.
+When is the best time to pour a concrete slab in Seattle?
Based on NOAA 1991-2020 normals, the comfortable months for this kind of work are April through November. July and August are typically the driest of those months. Local contractors' schedules matter as much as the weather, so book early for the busy months.
+What does "add rebar reinforcement" add in Seattle?
$480 to $1,450 for 400 sq ft, from a national range scaled by the local wage and goods indexes.
Concrete slab near Seattle
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 a Concrete Slab Cost? (2026) (accessed November 4, 2026)
- Estimators.us: Concrete Slab Cost in 2026 | $6-$12/Sq Ft Guide (accessed November 4, 2026)
- HomeGuide: How Much Does a Concrete Patio Cost? (2026) (accessed November 4, 2026)
- HomeGuide: How Much Does a Concrete Driveway Cost? (2026) (accessed November 4, 2026)
- BLS Occupational Employment and Wage Statistics, May 2025
- BEA Regional Price Parities, 2024
- NOAA NCEI U.S. Climate Normals, 1991-2020