Home addition cost in Madison, WI
Local estimate from BLS wage data and BEA price levels. Reviewed Nov 4, 2026.
- Typical range (300 sq ft)
- $40,200 – $81,300
- Per sq ft
- $132 – $265
- before permit
- Versus US midpoint
- +6%
- US $57,500
- Rank of 300 metros
- #66
- 1 = most expensive
A home addition in Madison, WI usually costs $40,200 to $81,300 for 300 sq ft. That works out to about $132 to $265 per sq ft before permits. Compared with the national midpoint that is $3,250 more. 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
$52,500 to $69,000
About $172 to $225 per sq ft before permits. Labor is about 70% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $14,600 | $19,100 |
| Labor | $37,000 | $48,300 |
| Permits and fees | $920 | $1,500 |
| Total | $52,500 | $69,000 |
Cost breakdown for 300 sq ft in Madison, WI
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $11,300 | $16,900 | $22,500 | 28% |
| Labor | $28,400 | $42,600 | $56,900 | 70% |
| Permits and fees | $490 | $1,200 | $1,950 | 2% |
| Total | $40,200 | $60,700 | $81,300 | 100% |
Why Madison prices look the way they do
The wage side of the estimate leans on carpenters, who do 50% of the hours on a typical job. Their local median is $30.52 an hour. Add the other trades involved and the blended wage index for Madison is 1.11 (US = 1.00), which puts labor at 70% of the total.
Materials are scaled with BEA's regional price parity for goods. Madison is at 93.8 against 100 for the US, so a materials line of $18,000 nationally becomes $16,900 here (midpoint, 300 sq ft). Permits follow the all-items index of 97.3: $490 to $1,950.
Madison: what basic, standard and premium work costs
The cited range is split into basic, standard and premium bands, then scaled to Madison. Bands overlap, because plenty of standard jobs cost as much as a light premium one. Sizes run from bump-out (100 sq ft) to large suite (600 sq ft).
Basic
$40,200 to $56,600
Bump-out or simple room without plumbing
Standard
$52,500 to $69,000
Standard room addition with HVAC and electrical
Premium
$64,900 to $81,300
Large addition with bath or kitchen and a new foundation
| Size | Basic | Standard | Premium |
|---|---|---|---|
| bump-out (100 sq ft) | $13,700 – $19,600 | $18,100 – $24,000 | $22,500 – $28,400 |
| 20x20 room (400 sq ft) | $53,400 – $75,100 | $69,700 – $91,500 | $86,000 – $108,000 |
| large suite (600 sq ft) | $79,800 – $112,000 | $104,000 – $136,500 | $128,500 – $160,500 |
Specs and site conditions that change a Madison bid
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.
What nearby projects cost in Madison
Jobs that often go together with home addition are priced below at their usual sizes, using the same Madison wage and price inputs. Compared with national midpoints, bathroom remodel comes out highest (+7%) and kitchen remodel lowest (−2%); the gap comes from the trades each job uses.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Kitchen remodel | 120 sq ft | $18,100 – $30,900 | −2% |
| Bathroom remodel | 45 sq ft | $5,000 – $24,900 | +7% |
| Detached garage | 576 sq ft | $29,800 – $59,800 | +3% |
| Roof replacement | 2,000 sq ft of roof | $6,500 – $13,000 | +5% |
Madison weather and the home addition calendar
Climate numbers on this page come from NOAA's 1991-2020 U.S. Climate Normals at the nearest suitable station, Madison Dane Rgnl Ap (5 miles from the city center). They are 30-year averages, so any one year can run hotter, colder or wetter.
For digging, grading and setting material in the ground, the comfortable months in Madison are April through October: 7 of 12. Outside them, January, February, March, November and December have an average overnight low at or below freezing (32°F).
In January, February, March, November and December the average low is at or below freezing, which means frozen ground and slower digging, compaction and sod or stone placement. NOAA counts about 147 days a year with a low at or below 32°F at this station.
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, September and October are the driest, at 3.4 and 2.8 inches. The station averages about 9 days a year at 90°F or above.
We do not adjust the estimate by month, because we have no reliable published data on seasonal pricing. It is still worth asking contractors whether an off-peak start date changes their bid.
| 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 | Cold |
| Dec | 32 | 18 | 1.6 | Cold |
What local crews earn in Madison
The labor line is built from BLS wage data, one trade at a time. This job draws on 6 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 Madison the blend is 1.11.
Carpenters (47-2031), 50% of the weighting: a median of $30.52 an hour, 5% above the US median of $29.12. The middle half of them earn between $25.71 and $39.68 an hour. About 2,320 work in the metro. That is 56.9 per 10,000 jobs, compared with 43.1 nationally, which suggests plenty of local crews to bid.
Cement masons and concrete finishers (47-2051), 10% of the weighting: a median of $31.69 an hour, 16% above the US median of $27.41. The middle half of them earn between $29.38 and $38.76 an hour. About 570 work in the metro. That is 14.0 per 10,000 jobs, compared with 13.3 nationally, so the supply of crews looks typical.
For electricians (47-2111, weighted 10%) the local median is $37.71 an hour, which is 24% above the national $30.38. The middle half of them earn between $27.92 and $48.32 an hour. BLS counts 1,760 of them working in the area, 43.1 for every 10,000 jobs (US: 48.7), so the local bench is about average.
Plumbers, pipefitters and steamfitters (47-2152), 10% of the weighting: a median of $40.94 an hour, 33% above the US median of $30.67. The middle half of them earn between $29.54 and $51.62 an hour. About 1,590 work in the metro. That is 39.0 per 10,000 jobs, compared with 30.0 nationally, which suggests plenty of local crews to bid.
For drywall and ceiling tile installers (47-2081, weighted 10%) the local median is $30.53 an hour, which is 8% above the national $28.33. The middle half of them earn between $28.76 and $37.65 an hour. BLS counts 170 of them working in the area, 4.2 for every 10,000 jobs (US: 5.3), so the local bench is thinner than average.
Roofers (47-2181), 10% of the weighting: a median of $29.24 an hour, 10% above the US median of $26.65. The middle half of them earn between $23.70 and $33.39 an hour. About 270 work in the metro. That is 6.6 per 10,000 jobs, compared with 8.7 nationally, so expect fewer local crews to bid.
A quick sensitivity check: moving the lead trade (carpenters) from the median to the 75th percentile wage adds about $6,000 to the midpoint estimate; the 25th percentile takes off about $3,150. That is a swing of roughly 5.2% to 9.9% of the total, which is useful for judging whether a bid reflects wages or something else, such as scope or margin.
Madison has 408,070 jobs in total (BLS, May 2025), ranking 61st by size among the 300 metros on this site.
| Trade | Weight | 25th pct | Median | 75th pct | US median | Ratio | Level used |
|---|---|---|---|---|---|---|---|
| Carpenters (47-2031) | 50% | $25.71 | $30.52 | $39.68 | $29.12 | 1.05 | metro |
| Cement masons and concrete finishers (47-2051) | 10% | $29.38 | $31.69 | $38.76 | $27.41 | 1.16 | metro |
| Electricians (47-2111) | 10% | $27.92 | $37.71 | $48.32 | $30.38 | 1.24 | metro |
| Plumbers, pipefitters and steamfitters (47-2152) | 10% | $29.54 | $40.94 | $51.62 | $30.67 | 1.33 | metro |
| Drywall and ceiling tile installers (47-2081) | 10% | $28.76 | $30.53 | $37.65 | $28.33 | 1.08 | metro |
| Roofers (47-2181) | 10% | $23.70 | $29.24 | $33.39 | $26.65 | 1.10 | metro |
| Blended | 100% | 1.11 | |||||
How Madison compares
Same job, same size (300 sq ft), priced for the nearest metros. Oshkosh is the priciest of the group at $67,500. Dubuque is the cheapest at $55,000.
| Area | Range | Midpoint | vs. here |
|---|---|---|---|
| Madison, WIthis page | $40,200 – $81,300 | $60,700 | |
| Janesville, WI40 miles | $43,100 – $87,100 | $65,100 | +7% |
| Rockford, IL60 miles | $43,600 – $88,200 | $65,900 | +9% |
| Dubuque, IA80 miles | $36,400 – $73,600 | $55,000 | −10% |
| Oshkosh, WI85 miles | $44,700 – $90,300 | $67,500 | +11% |
| La Crosse, WI85 miles | $38,400 – $77,800 | $58,100 | −4% |
| Wisconsin (statewide) | $39,300 – $79,500 | $59,400 | −2% |
| United States | $38,000 – $77,000 | $57,500 | −5% |
Out of the 300 metros we cover, Madison ranks #66 for the cost of this job (#1 is the most expensive). Statewide, Madison is 2% above the Wisconsin figure.
Elsewhere in Wisconsin
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Milwaukee, WI | 820,780 jobs | $40,500 – $81,900 | $61,200 | +1% |
| Green Bay, WI | 174,550 jobs | $39,400 – $79,600 | $59,500 | −2% |
| Appleton, WI | 124,230 jobs | $39,800 – $80,400 | $60,100 | −1% |
| Oshkosh, WI | 93,750 jobs | $44,700 – $90,300 | $67,500 | +11% |
| Eau Claire, WI | 86,060 jobs | $38,600 – $78,000 | $58,300 | −4% |
| La Crosse, WI | 84,380 jobs | $38,400 – $77,800 | $58,100 | −4% |
Metros of a similar size
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 | $36,100 – $73,100 | $54,600 | −10% |
| Albuquerque, NM | 404,700 jobs | $36,300 – $73,600 | $55,000 | −10% |
| Knoxville, TN | 424,600 jobs | $33,600 – $68,100 | $50,800 | −16% |
| Bridgeport, CT | 404,180 jobs | $40,900 – $82,900 | $61,900 | +2% |
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Home addition in Madison: your questions
+How much does it cost to build a home addition in Madison?
For 300 sq ft, expect $40,200 to $81,300 in the Madison area. A standard-spec job lands at $52,500 to $69,000. Small jobs usually cost more per sq ft and large ones less.
+What is the price per sq ft for home addition in Madison?
About $132 to $265 per sq ft for materials and labor, plus $490 to $1,950 for the permit if one is needed. The US range is $125 to $250.
+Is home addition cheaper in Madison or Janesville?
Janesville is 40 miles away. The midpoint for 300 sq ft there is $65,100, which is 7% more than Madison ($60,700). Wage and materials indexes both feed that gap.
+How much of the bill is labor in Madison?
About 70% at the midpoint, or $42,600 out of $60,700. Materials are 28% and permits 2%. Nationally, labor is 67%.
+What would 20x20 room (400 sq ft) cost in Madison?
$53,400 to $108,000. Pick a different size in the estimator above to get your own number.
+Does home addition need a permit in Madison?
Often, but rules are set by your city or county building office, so call before you hire. Budget $490 to $1,950 for fees in the Madison area (our national range of $500 to $2,000 scaled by the local price level).
+Is Madison expensive for home addition compared with the rest of Wisconsin?
Madison is 2% above the Wisconsin statewide estimate ($59,400 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 home addition work cost in Madison?
For 300 sq ft, basic work runs $40,200 to $56,600 and premium work $64,900 to $81,300. Basic means: bump-out or simple room without plumbing. Premium means: large addition with bath or kitchen and a new foundation.
+When is the best time to build a home addition in Madison?
Based on NOAA 1991-2020 normals, the comfortable months for this kind of work are April through October. September and October are typically the driest of those months. Local contractors' schedules matter as much as the weather, so book early for the busy months.
Home addition 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 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.