Composite deck cost in Madison, WI
Local estimate from BLS wage data and BEA price levels. Reviewed Nov 4, 2026.
- Typical range (300 sq ft)
- $12,300 – $24,700
- Per sq ft
- $41 – $82
- before permit
- Versus US midpoint
- +2%
- US $18,100
- Rank of 300 metros
- #72
- 1 = most expensive
If you want to build a composite deck in Madison, plan on $12,300 to $24,700 for 300 sq ft, all in. Per sq ft, that is $41 to $82 for materials and labor, with the permit on top. The local midpoint lands close to the national one. Carpenters earn a median of $30.52 an hour in the Madison area, 5% above the US median of $29.12.
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Estimated cost for 300 sq ft in Madison, WI, standard level
$16,000 to $21,000
About $53 to $69.50 per sq ft before permits. Labor is about 63% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $5,850 | $7,650 |
| Labor | $10,100 | $13,200 |
| Permits and fees | $80 | $120 |
| Total | $16,000 | $21,000 |
Cost breakdown for 300 sq ft in Madison, WI
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $4,500 | $6,750 | $9,000 | 36% |
| Labor | $7,800 | $11,700 | $15,600 | 63% |
| Permits and fees | $50 | $95 | $150 | 1% |
| Total | $12,300 | $18,500 | $24,700 | 100% |
What is behind the Madison number
Labor is 63% of the midpoint bill here, against 60% nationally. The mix of trades behind this job is carpenters (80%), construction laborers (20%). We weight each trade's local median wage by that share and compare it with the national median. In Madison the blended ratio comes out at 1.08.
On the materials line, the BEA goods price index for the Madison metro is 93.8 (US = 100). The midpoint materials bill for 300 sq ft comes to $6,750, compared with $7,200 at national prices. Permit and inspection fees are scaled by the broader index (97.3) and land at $50 to $150.
Why two Madison quotes can differ
Board grade
Composite materials run $16-$32 per sq ft and the installed price is $40-$80 per sq ft, including the substructure (HomeGuide).
Labor
Labor for composite is $24-$48 per sq ft, higher than wood because the boards need extra parts and more careful assembly.
Drainage
Ground-level decks over poorly draining yards may need $1,000-$4,000 of drainage work first.
Add-ons priced for Madison
Extras are quoted nationally and then scaled to Madison by the average of the local wage index (1.08) and goods index (0.94), a factor of 1.01. 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 a deck railing (approx. 0.3 ft per sq ft) | $1,800 – $5,450 |
Madison: what basic, standard and premium work costs
Three bands are cut from the same cited range and localized for Madison 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 4 common sizes.
Basic
$12,300 to $17,300
Entry-level composite boards, low deck, simple shape
Standard
$16,000 to $21,000
Mid-grade capped boards with railing and stairs
Premium
$19,800 to $24,700
Premium capped or PVC boards, multi-level, hidden fasteners
| Size | Basic | Standard | Premium |
|---|---|---|---|
| 10x12 (120 sq ft) | $4,950 – $6,950 | $6,450 – $8,450 | $7,950 – $9,950 |
| 12x12 (144 sq ft) | $5,950 – $8,350 | $7,750 – $10,100 | $9,550 – $11,900 |
| 16x20 (320 sq ft) | $13,100 – $18,400 | $17,100 – $22,400 | $21,100 – $26,300 |
| 20x20 (400 sq ft) | $16,400 – $23,000 | $21,400 – $28,000 | $26,300 – $32,900 |
Planning more than one job in Madison?
Because every project leans on different trades, Madison's wage level does not move all prices equally. Against the US midpoint, paver patio runs +12% and wood deck level.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Wood deck | 300 sq ft | $7,550 – $15,200 | level |
| Concrete patio | 300 sq ft | $1,300 – $4,300 | +7% |
| Paver patio | 300 sq ft | $3,350 – $6,100 | +12% |
| Gutters | 160 linear ft | $1,350 – $4,300 | +3% |
How Madison compares
Contractors rarely work more than an hour or two from home, so the neighboring metros set a rough ceiling and floor for your quotes. Midpoints for 300 sq ft range from $17,600 to $21,200 across Madison and its five closest metros.
| Area | Range | Midpoint | vs. here |
|---|---|---|---|
| Madison, WIthis page | $12,300 – $24,700 | $18,500 | |
| Janesville, WI40 miles | $13,400 – $26,900 | $20,200 | +9% |
| Rockford, IL60 miles | $13,200 – $26,500 | $19,900 | +7% |
| Dubuque, IA80 miles | $11,700 – $23,500 | $17,600 | −5% |
| Oshkosh, WI85 miles | $14,100 – $28,300 | $21,200 | +15% |
| La Crosse, WI85 miles | $12,000 – $24,000 | $18,000 | −3% |
| Wisconsin (statewide) | $12,200 – $24,400 | $18,300 | −1% |
| United States | $12,100 – $24,200 | $18,100 | −2% |
Across 300 US metros, Madison comes in at #72 from the top. The priciest is Honolulu, HI at $25,200; the cheapest is Brownsville, TX at $13,500 (midpoints, 300 sq ft). Statewide, Madison is 1% above the Wisconsin figure.
Other Wisconsin metros
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Milwaukee, WI | 820,780 jobs | $12,400 – $24,800 | $18,600 | level |
| Green Bay, WI | 174,550 jobs | $12,000 – $24,000 | $18,000 | −3% |
| Appleton, WI | 124,230 jobs | $12,300 – $24,600 | $18,500 | level |
| Oshkosh, WI | 93,750 jobs | $14,100 – $28,300 | $21,200 | +15% |
| Eau Claire, WI | 86,060 jobs | $11,900 – $23,900 | $17,900 | −3% |
| La Crosse, WI | 84,380 jobs | $12,000 – $24,000 | $18,000 | −3% |
Cities with a workforce like Madison's
Big cities and small ones price differently, so here is Madison against the 4 metros with the closest total employment.
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Baton Rouge, LA | 409,690 jobs | $11,000 – $22,100 | $16,500 | −11% |
| Albuquerque, NM | 404,700 jobs | $11,600 – $23,300 | $17,400 | −6% |
| Knoxville, TN | 424,600 jobs | $10,900 – $21,800 | $16,300 | −12% |
| Bridgeport, CT | 404,180 jobs | $12,500 – $25,100 | $18,800 | +2% |
Madison labor market for composite deck
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 Madison is 1.08 times the national level.
For carpenters (47-2031, weighted 80%) the local median is $30.52 an hour, which is 5% above the national $29.12. The middle half of them earn between $25.71 and $39.68 an hour. BLS counts 2,320 of them working in the area, 56.9 for every 10,000 jobs (US: 43.1), so the local bench is deeper than average.
Construction laborers (47-2061), 20% of the weighting: a median of $27.40 an hour, 21% above the US median of $22.66. The middle half of them earn between $22.70 and $31.94 an hour. About 2,370 work in the metro. That is 58.1 per 10,000 jobs, compared with 70.5 nationally, so expect fewer local crews to bid.
Quotes come from real crews, not medians. If the carpenters on your job are paid at the 75th percentile ($39.68 an hour) instead of the median, the labor line grows by about $2,700. At the 25th percentile ($25.71) it shrinks by about $1,450. The total moves by 14.7% or 7.7%, so wages alone rarely explain a quote that is far outside our range.
For context on the local economy, BLS counts 408,070 jobs in the Madison area. That makes it the 61st largest of the 300 metros we cover, with 0.26% of US employment.
| Trade | Weight | 25th pct | Median | 75th pct | US median | Ratio | Level used |
|---|---|---|---|---|---|---|---|
| Carpenters (47-2031) | 80% | $25.71 | $30.52 | $39.68 | $29.12 | 1.05 | metro |
| Construction laborers (47-2061) | 20% | $22.70 | $27.40 | $31.94 | $22.66 | 1.21 | metro |
| Blended | 100% | 1.08 | |||||
Climate in Madison: timing your composite deck job
We use NOAA's 1991-2020 climate normals for Madison Dane Rgnl Ap (5 miles from the city center). These are 30-year monthly averages, not forecasts.
April through November is the stretch where exterior installation runs into the fewest weather problems in Madison (8 of 12 months). January, February, March and December have an average daytime high under 45°F.
In January, February, March and December the average high stays below 45°F. Sealants, adhesives and some materials, such as vinyl, are harder to install well in the cold, and short daylight cuts the working day.
Madison gets about 37 inches of precipitation in a normal year, including roughly 52 inches of snow. The wettest months are June, July and August (5.3 inches in June). Inside the workable window, October and November are the driest, at 2.8 and 2.2 inches. The station averages about 9 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 | 27 | 12 | 1.5 | Cold |
| Feb | 31 | 15 | 1.5 | Cold |
| Mar | 44 | 25 | 2.3 | Cold |
| Apr | 57 | 36 | 3.8 | Workable |
| May | 69 | 47 | 4.1 | Workable |
| Jun | 79 | 57 | 5.3 | Workable |
| Jul | 82 | 62 | 4.5 | Workable |
| Aug | 80 | 60 | 4.2 | Workable |
| Sep | 73 | 51 | 3.4 | Workable |
| Oct | 60 | 40 | 2.8 | Workable |
| Nov | 45 | 29 | 2.2 | Workable |
| Dec | 32 | 18 | 1.6 | Cold |
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 $16,000 to $21,000 for Madison, WI is attached.
A detailed PDF report of this estimate, $9
Multi-page report for Madison, WI: low, typical and high cost, a line-item breakdown of materials and labor by trade, permit notes, the best months to schedule, a quote comparison sheet, red flags, questions for contractors, checklists and every source. Save your estimate above, preview page 1 free, and unlock the full report for $9 one-time, or get every report with CostLocal Pro.
Composite deck in Madison: your questions
+How much does it cost to build a composite deck in Madison?
For 300 sq ft, expect $12,300 to $24,700 in the Madison area. A standard-spec job lands at $16,000 to $21,000. Small jobs usually cost more per sq ft and large ones less.
+What is the price per sq ft for composite deck in Madison?
About $41 to $82 per sq ft for materials and labor, plus $50 to $150 for the permit if one is needed. The US range is $40 to $80.
+Is composite deck cheaper in Madison or Janesville?
Janesville is 40 miles away. The midpoint for 300 sq ft there is $20,200, which is 9% more than Madison ($18,500). Wage and materials indexes both feed that gap.
+How much of the bill is labor in Madison?
About 63% at the midpoint, or $11,700 out of $18,500. Materials are 36% and permits 1%. Nationally, labor is 60%.
+What would 16x20 (320 sq ft) cost in Madison?
$13,100 to $26,300. Pick a different size in the estimator above to get your own number.
+Does composite deck need a permit in Madison?
Often, but rules are set by your city or county building office, so call before you hire. Budget $50 to $150 for fees in the Madison area (our national range of $50 to $150 scaled by the local price level).
+Is Madison expensive for composite deck compared with the rest of Wisconsin?
Madison is 1% above the Wisconsin statewide estimate ($18,300 at the midpoint). We cover 12 metros in Wisconsin; see the state page to compare them.
+What do carpenters earn in Madison?
The BLS median is $30.52 an hour in the Madison area, compared with $29.12 nationally. The 25th to 75th percentile range is $25.71 to $39.68.
+What do basic and premium composite deck work cost in Madison?
For 300 sq ft, basic work runs $12,300 to $17,300 and premium work $19,800 to $24,700. Basic means: entry-level composite boards, low deck, simple shape. Premium means: premium capped or PVC boards, multi-level, hidden fasteners.
+When is the best time to build a composite deck in Madison?
Based on NOAA 1991-2020 normals, the comfortable months for this kind of work are April through November. October and November 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 a deck railing" add in Madison?
$1,800 to $5,450 for 300 sq ft, from a national range scaled by the local wage and goods indexes.
Composite deck near Madison
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 Composite Decking Cost? (2026) (accessed November 4, 2026)
- HomeGuide: 2026 Building Permit Costs | Fees & Cost Calculator (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