Home addition cost in Wisconsin
Statewide estimate from BLS wages and BEA prices. Reviewed Nov 4, 2026.
- Statewide range (300 sq ft)
- $39,300 – $79,500
- Per sq ft
- $129 – $259
- before permit
- Versus US midpoint
- +3%
- US $57,500
- Metros covered
- 12
Across Wisconsin, a home addition costs about $39,300 to $79,500 for 300 sq ft. Statewide, that midpoint is 3% above the US figure of $57,500. Carpenters earn a median $29.65 an hour in Wisconsin (US: $29.12).
Inside Wisconsin, the metros we cover range from $55,900 (Wausau) to $67,500 (Oshkosh) at the midpoint. Pick your closest city in the table for a tighter number.
Estimate your home addition cost
Pick a size, a quality level and where you live. Prices update as you type.
Estimated cost for 300 sq ft in Wisconsin (statewide), standard level
$51,400 to $67,500
About $168 to $220 per sq ft before permits. Labor is about 69% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $14,700 | $19,200 |
| Labor | $35,800 | $46,800 |
| Permits and fees | $890 | $1,450 |
| Total | $51,400 | $67,500 |
Cost breakdown for 300 sq ft in Wisconsin
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $11,300 | $17,000 | $22,600 | 29% |
| Labor | $27,500 | $41,300 | $55,000 | 69% |
| Permits and fees | $470 | $1,200 | $1,900 | 2% |
| Total | $39,300 | $59,400 | $79,500 | 100% |
Quality levels and sizes in Wisconsin
The cited range is cut into three overlapping bands (basic, standard and premium) and scaled to statewide Wisconsin wages and prices. The grid prices the same bands at 3 common sizes.
Basic
$39,300 to $55,400
Bump-out or simple room without plumbing
Standard
$51,400 to $67,500
Standard room addition with HVAC and electrical
Premium
$63,500 to $79,500
Large addition with bath or kitchen and a new foundation
| Size | Basic | Standard | Premium |
|---|---|---|---|
| bump-out (100 sq ft) | $13,400 – $19,200 | $17,700 – $23,500 | $22,000 – $27,800 |
| 20x20 room (400 sq ft) | $52,200 – $73,500 | $68,200 – $89,500 | $84,200 – $105,500 |
| large suite (600 sq ft) | $78,100 – $110,000 | $102,000 – $133,500 | $125,500 – $157,000 |
Home addition: what moves the price in Wisconsin
Type of addition
A new room is $125-$250 per sq ft; a bump-out $85-$200; an attic conversion $50-$150; a garage conversion $50-$200 (HomeGuide).
Plumbing and fixtures
Adding a bathroom or kitchen drives the price up the most.
Permits
Construction permits run $500-$2,000, or $5-$21 per $1,000 of project cost (HomeGuide).
Foundation
A foundation, framing, roofing and matching exterior finishes all have to be built before the interior work starts.
Wages behind the Wisconsin number
Statewide wages come from BLS's state-level estimates, which blend big cities with small towns and rural areas. 6 trades drive the labor line for this job, and the weighted ratio against the national wage level is 1.08 for Wisconsin.
For carpenters (47-2031, weighted 50%) the local median is $29.65 an hour, which is in line with the national $29.12. The middle half of them earn between $23.92 and $38.13 an hour. BLS counts 13,880 of them working in the state, 47.2 for every 10,000 jobs (US: 43.1), so the local bench is about average.
For cement masons and concrete finishers (47-2051, weighted 10%) the local median is $30.89 an hour, which is 13% above the national $27.41. The middle half of them earn between $28.40 and $38.29 an hour. BLS counts 4,490 of them working in the state, 15.3 for every 10,000 jobs (US: 13.3), so the local bench is deeper than average.
Electricians (47-2111), 10% of the weighting: a median of $36.80 an hour, 21% above the US median of $30.38. The middle half of them earn between $26.84 and $45.09 an hour. About 14,310 work in the state. That is 48.6 per 10,000 jobs, compared with 48.7 nationally, so the supply of crews looks typical.
For plumbers, pipefitters and steamfitters (47-2152, weighted 10%) the local median is $39.04 an hour, which is 27% above the national $30.67. The middle half of them earn between $29.53 and $49.79 an hour. BLS counts 10,210 of them working in the state, 34.7 for every 10,000 jobs (US: 30.0), so the local bench is deeper than average.
Drywall and ceiling tile installers (47-2081), 10% of the weighting: a median of $28.83 an hour, in line with the US median of $28.33. The middle half of them earn between $23.05 and $33.42 an hour. About 1,140 work in the state. That is 3.9 per 10,000 jobs, compared with 5.3 nationally, so expect fewer local crews to bid.
For roofers (47-2181, weighted 10%) the local median is $28.54 an hour, which is 7% above the national $26.65. The middle half of them earn between $23.01 and $31.41 an hour. BLS counts 2,400 of them working in the state, 8.2 for every 10,000 jobs (US: 8.7), so the local bench is about average.
A crew paid at the 75th percentile for carpenters ($38.13 an hour) would add about $5,550 to the statewide midpoint; one at the 25th percentile ($23.92) would take off about $3,750. Use that as a rough guide to how far a bid can sit from our midpoint on wages alone.
BLS counts 2,941,540 jobs across Wisconsin (May 2025), which is 1.9% of US employment.
| Trade | Weight | 25th pct | Median | 75th pct | US median | Ratio | Level used |
|---|---|---|---|---|---|---|---|
| Carpenters (47-2031) | 50% | $23.92 | $29.65 | $38.13 | $29.12 | 1.02 | state |
| Cement masons and concrete finishers (47-2051) | 10% | $28.40 | $30.89 | $38.29 | $27.41 | 1.13 | state |
| Electricians (47-2111) | 10% | $26.84 | $36.80 | $45.09 | $30.38 | 1.21 | state |
| Plumbers, pipefitters and steamfitters (47-2152) | 10% | $29.53 | $39.04 | $49.79 | $30.67 | 1.27 | state |
| Drywall and ceiling tile installers (47-2081) | 10% | $23.05 | $28.83 | $33.42 | $28.33 | 1.02 | state |
| Roofers (47-2181) | 10% | $23.01 | $28.54 | $31.41 | $26.65 | 1.07 | state |
| Blended | 100% | 1.08 | |||||
How Wisconsin compares with nearby states
Wisconsin ranks 13 of 51 (the 50 states plus DC) for home addition, where 1 is the most expensive. The costliest is Hawaii at $76,300 and the cheapest Arkansas at $48,200, both for 300 sq ft at the midpoint. Wisconsin sits at $59,400. The five states closest by workforce center are listed below.
| State | Distance | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Illinois | 120 miles away | $47,400 – $95,800 | $71,600 | +21% |
| Iowa | 230 miles away | $35,900 – $72,700 | $54,300 | −9% |
| Michigan | 230 miles away | $39,200 – $79,400 | $59,300 | level |
| Minnesota | 260 miles away | $42,200 – $85,400 | $63,800 | +7% |
| Indiana | 260 miles away | $38,500 – $78,000 | $58,300 | −2% |
Which Wisconsin city is cheapest for home addition?
7 of the 12 metros sit above the statewide midpoint of $59,400, and the top-to-bottom gap is 21%. Each row prices the default size with that metro's own BLS wages and BEA price levels, so the gap between rows is real local variation rather than a flat markup.
| Metro | Range (300 sq ft) | Midpoint | vs. state |
|---|---|---|---|
| Oshkosh, WI | $44,700 – $90,300 | $67,500 | +14% |
| Janesville, WI | $43,100 – $87,100 | $65,100 | +9% |
| Milwaukee, WI | $40,500 – $81,900 | $61,200 | +3% |
| Madison, WI | $40,200 – $81,300 | $60,700 | +2% |
| Kenosha, WI | $40,100 – $81,100 | $60,600 | +2% |
| Sheboygan, WI | $40,100 – $81,100 | $60,600 | +2% |
| Appleton, WI | $39,800 – $80,400 | $60,100 | +1% |
| Green Bay, WI | $39,400 – $79,600 | $59,500 | level |
| Racine, WI | $39,200 – $79,300 | $59,300 | level |
| Eau Claire, WI | $38,600 – $78,000 | $58,300 | −2% |
| La Crosse, WI | $38,400 – $77,800 | $58,100 | −2% |
| Wausau, WI | $37,000 – $74,900 | $55,900 | −6% |
If you are planning more than one job in Wisconsin
The table prices neighboring jobs at their usual sizes using statewide Wisconsin wages and prices. Against national midpoints, bathroom remodel comes out highest (+4%) and kitchen remodel lowest (−3%), because each job leans on different trades.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Kitchen remodel | 120 sq ft | $18,000 – $30,700 | −3% |
| Bathroom remodel | 45 sq ft | $4,900 – $24,300 | +4% |
| Detached garage | 576 sq ft | $29,500 – $59,100 | +2% |
| Roof replacement | 2,000 sq ft of roof | $6,400 – $12,800 | +3% |
When Wisconsin weather lets you build
Season matters for home addition. For each Wisconsin metro below we took NOAA's 1991-2020 monthly normals from the nearest suitable station and counted comfortable months for digging and ground work.
Milwaukee has the longest comfortable season of the metros we cover in Wisconsin at 7 months (April through October); Wausau has the shortest at 6 (May through October). Rainfall runs from 32 inches a year in Green Bay to 37 inches in La Crosse.
We do not adjust prices by month, because we have no reliable published data on seasonal pricing. Timing is still worth raising when you collect bids.
| Metro | Jan avg low °F | Jul avg high °F | Precip (in/yr) | Comfortable months |
|---|---|---|---|---|
| Milwaukee | 14 | 83 | 34 | 7: April through October |
| Madison | 12 | 82 | 37 | 7: April through October |
| Green Bay | 11 | 81 | 32 | 7: April through October |
| Appleton | 10 | 82 | 33 | 7: April through October |
| Oshkosh | 10 | 82 | 33 | 7: April through October |
| Eau Claire | 6 | 83 | 33 | 7: April through October |
| La Crosse | 8 | 80 | 37 | 7: April through October |
| Racine | 16 | 81 | 32 | 7: April through October |
| Kenosha | 16 | 84 | 32 | 7: April through October |
| Janesville | 12 | 83 | 37 | 7: April through October |
| Wausau | 7 | 80 | 34 | 6: May through October |
| Sheboygan | 15 | 82 | 35 | 7: April through October |
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 $51,400 to $67,500 for Wisconsin is attached.
A detailed PDF report of this estimate, $9
Multi-page report for Wisconsin: 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.
Home addition in Wisconsin: your questions
+How much does it cost to build a home addition in Wisconsin?
$39,300 to $79,500 for 300 sq ft, using statewide wages and prices. Metro areas inside Wisconsin can sit above or below that.
+Which city in Wisconsin is cheapest for home addition?
Wausau at about $55,900 (midpoint, 300 sq ft). The priciest is Oshkosh at $67,500.
+Is home addition cheaper in Wisconsin than the US average?
It is 3% more expensive: $59,400 against $57,500 for 300 sq ft at the midpoint.
+What share of the price is labor in Wisconsin?
About 69% ($41,300). Materials are 29%. Statewide labor for this job is weighted 1.08x the national wage level.
+What do carpenters earn in Wisconsin?
The BLS statewide median is $29.65 an hour, against $29.12 for the US. The 25th to 75th percentile range is $23.92 to $38.13.
+Where does Wisconsin rank for home addition costs?
13th most expensive of 51 (the 50 states plus DC) at the midpoint, $59,400 for 300 sq ft. Rank 1 is the costliest.
+What do basic and premium home addition work cost in Wisconsin?
For 300 sq ft, basic work runs $39,300 to $55,400 and premium work $63,500 to $79,500. Basic means: bump-out or simple room without plumbing. Premium means: large addition with bath or kitchen and a new foundation.
+Does the season matter for home addition in Wisconsin?
Yes where winters or summers are hard. Of the Wisconsin metros we cover, Milwaukee has the most comfortable months (7 of 12) based on NOAA 1991-2020 normals. Our prices do not change by month, so ask contractors whether they charge more or less in busy and slow seasons.
Home addition by city in Wisconsin
- Oshkosh, WI$67,500 midpoint
- Janesville, WI$65,100 midpoint
- Milwaukee, WI$61,200 midpoint
- Madison, WI$60,700 midpoint
- Kenosha, WI$60,600 midpoint
- Sheboygan, WI$60,600 midpoint
- Appleton, WI$60,100 midpoint
- Green Bay, WI$59,500 midpoint
- Racine, WI$59,300 midpoint
- Eau Claire, WI$58,300 midpoint
- La Crosse, WI$58,100 midpoint
- Wausau, WI$55,900 midpoint
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 Home Addition Cost? (2026) (accessed November 4, 2026)
- Cost to Renovate: Renovation Labor Report 2026: Where the Money Goes (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
Note on derived figures: Materials = 32% of the installed price, from Cost to Renovate's mid-range 'Structural' category split (56% labor, 32% materials, 11% permits and design). It is a category average rather than an addition-specific figure.