Home addition cost in Green Bay, WI
Local estimate from BLS wage data and BEA price levels. Reviewed Nov 4, 2026.
- Typical range (300 sq ft)
- $39,400 – $79,600
- Per sq ft
- $130 – $259
- before permit
- Versus US midpoint
- +3%
- US $57,500
- Rank of 300 metros
- #83
- 1 = most expensive
Green Bay homeowners pay roughly $39,400 to $79,600 to build a home addition at 300 sq ft, or $130 to $259 per sq ft (permit not included). Against the US midpoint, Green Bay is 3% higher. Carpenters earn a median of $29.00 an hour in the Green Bay area, 0% below the US median of $29.12.
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Estimated cost for 300 sq ft in Green Bay, WI, standard level
$51,400 to $67,600
About $169 to $220 per sq ft before permits. Labor is about 70% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $14,600 | $19,100 |
| Labor | $35,900 | $47,000 |
| Permits and fees | $880 | $1,450 |
| Total | $51,400 | $67,600 |
Cost breakdown for 300 sq ft in Green Bay, WI
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $11,300 | $16,900 | $22,500 | 28% |
| Labor | $27,600 | $41,500 | $55,300 | 70% |
| Permits and fees | $470 | $1,150 | $1,850 | 2% |
| Total | $39,400 | $59,500 | $79,600 | 100% |
Where the Green Bay price comes from
We price the labor side from BLS wage data for 6 trades: carpenters at 50%, cement masons and concrete finishers at 10%, electricians at 10%, plumbers, pipefitters and steamfitters at 10%, drywall and ceiling tile installers at 10%, roofers at 10%. Weighted together, Green Bay wages are 1.08 times the national level. Labor makes up about 70% of the midpoint estimate (67% at national prices).
On the materials line, the BEA goods price index for the Green Bay metro is 93.8 (US = 100). The midpoint materials bill for 300 sq ft comes to $16,900, compared with $18,000 at national prices. Permit and inspection fees are scaled by the broader index (93.1) and land at $470 to $1,850.
Data note: 10% of the labor weighting for this project uses a statewide median because BLS has no published metro figure for that trade in Green Bay. The wage table below marks each row.
How Green Bay 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 $54,400 to $67,500 across Green Bay and its five closest metros.
| Area | Range | Midpoint | vs. here |
|---|---|---|---|
| Green Bay, WIthis page | $39,400 – $79,600 | $59,500 | |
| Appleton, WI20 miles | $39,800 – $80,400 | $60,100 | +1% |
| Oshkosh, WI45 miles | $44,700 – $90,300 | $67,500 | +13% |
| Sheboygan, WI50 miles | $40,100 – $81,100 | $60,600 | +2% |
| Wausau, WI90 miles | $37,000 – $74,900 | $55,900 | −6% |
| Muskegon, MI105 miles | $35,900 – $72,800 | $54,400 | −9% |
| Wisconsin (statewide) | $39,300 – $79,500 | $59,400 | level |
| United States | $38,000 – $77,000 | $57,500 | −3% |
Across 300 US metros, Green Bay comes in at #83 from the top. The priciest is Honolulu, HI at $79,600; the cheapest is Brownsville, TX at $44,300 (midpoints, 300 sq ft). Statewide, Green Bay is 0% above the Wisconsin figure.
Other Wisconsin metros
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Milwaukee, WI | 820,780 jobs | $40,500 – $81,900 | $61,200 | +3% |
| Madison, WI | 408,070 jobs | $40,200 – $81,300 | $60,700 | +2% |
| Appleton, WI | 124,230 jobs | $39,800 – $80,400 | $60,100 | +1% |
| Oshkosh, WI | 93,750 jobs | $44,700 – $90,300 | $67,500 | +13% |
| Eau Claire, WI | 86,060 jobs | $38,600 – $78,000 | $58,300 | −2% |
| La Crosse, WI | 84,380 jobs | $38,400 – $77,800 | $58,100 | −2% |
Cities with a workforce like Green Bay's
Big cities and small ones price differently, so here is Green Bay against the 4 metros with the closest total employment.
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Reading, PA | 174,670 jobs | $37,300 – $75,500 | $56,400 | −5% |
| Naples, FL | 173,880 jobs | $34,000 – $69,000 | $51,500 | −13% |
| Anchorage, AK | 177,050 jobs | $45,800 – $92,600 | $69,200 | +16% |
| Mobile, AL | 172,550 jobs | $33,300 – $67,500 | $50,400 | −15% |
Cost by quality level and size in Green Bay
Three bands are cut from the same cited range and localized for Green Bay 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
$39,400 to $55,500
Bump-out or simple room without plumbing
Standard
$51,400 to $67,600
Standard room addition with HVAC and electrical
Premium
$63,500 to $79,600
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) | $52,300 – $73,600 | $68,300 – $89,600 | $84,300 – $105,500 |
| large suite (600 sq ft) | $78,200 – $110,000 | $102,000 – $133,500 | $125,500 – $157,500 |
Specs and site conditions that change a Green Bay bid
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.
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).
Local wages behind the labor line
Wages are the part of this estimate that changes most from town to town. 6 trades carry the job here, and each is compared with its US median. The weighted result for Green Bay is 1.08 times the national level.
For carpenters (47-2031, weighted 50%) the local median is $29.00 an hour, which is in line with the national $29.12. The middle half of them earn between $23.46 and $36.01 an hour. BLS counts 860 of them working in the area, 49.3 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 $28.37 and $37.30 an hour. BLS counts 310 of them working in the area, 17.8 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 $37.15 an hour, 22% above the US median of $30.38. The middle half of them earn between $24.79 and $44.59 an hour. About 910 work in the metro. That is 52.1 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 $43.54 an hour, which is 42% above the national $30.67. The middle half of them earn between $30.67 and $49.81 an hour. BLS counts 730 of them working in the area, 41.8 for every 10,000 jobs (US: 30.0), so the local bench is deeper than average.
Drywall and ceiling tile installers (47-2081) carry 10% of the labor weighting. BLS does not publish this trade for the Green Bay metro, so we used the Wisconsin statewide median: $28.83 an hour against $28.33 for the US. The middle half of them earn between $23.05 and $33.42 an hour.
For roofers (47-2181, weighted 10%) the local median is $28.52 an hour, which is 7% above the national $26.65. The middle half of them earn between $23.31 and $35.97 an hour. BLS counts 90 of them working in the area, 5.2 for every 10,000 jobs (US: 8.7), so the local bench is thinner than average.
Quotes come from real crews, not medians. If the carpenters on your job are paid at the 75th percentile ($36.01 an hour) instead of the median, the labor line grows by about $4,600. At the 25th percentile ($23.46) it shrinks by about $3,650. The total moves by 7.7% or 6.1%, so wages alone rarely explain a quote that is far outside our range.
For context on the local economy, BLS counts 174,550 jobs in the Green Bay area. That makes it the 133rd largest of the 300 metros we cover, with 0.11% of US employment.
| Trade | Weight | 25th pct | Median | 75th pct | US median | Ratio | Level used |
|---|---|---|---|---|---|---|---|
| Carpenters (47-2031) | 50% | $23.46 | $29.00 | $36.01 | $29.12 | 1.00 | metro |
| Cement masons and concrete finishers (47-2051) | 10% | $28.37 | $30.89 | $37.30 | $27.41 | 1.13 | metro |
| Electricians (47-2111) | 10% | $24.79 | $37.15 | $44.59 | $30.38 | 1.22 | metro |
| Plumbers, pipefitters and steamfitters (47-2152) | 10% | $30.67 | $43.54 | $49.81 | $30.67 | 1.42 | metro |
| Drywall and ceiling tile installers (47-2081) | 10% | $23.05 | $28.83 | $33.42 | $28.33 | 1.02 | state |
| Roofers (47-2181) | 10% | $23.31 | $28.52 | $35.97 | $26.65 | 1.07 | metro |
| Blended | 100% | 1.08 | |||||
Planning more than one job in Green Bay?
Because every project leans on different trades, Green Bay's wage level does not move all prices equally. Against the US midpoint, bathroom remodel runs +5% and kitchen remodel −3%.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Kitchen remodel | 120 sq ft | $18,000 – $30,600 | −3% |
| Bathroom remodel | 45 sq ft | $4,950 – $24,500 | +5% |
| Detached garage | 576 sq ft | $29,200 – $58,600 | +1% |
| Roof replacement | 2,000 sq ft of roof | $6,350 – $12,700 | +3% |
When to schedule home addition in Green Bay
We use NOAA's 1991-2020 climate normals for Green Bay (5 miles from the city center). These are 30-year monthly averages, not forecasts.
April through October is the stretch where digging, grading and setting material in the ground runs into the fewest weather problems in Green Bay (7 of 12 months). 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 152 days a year with a low at or below 32°F at this station.
Green Bay gets about 32 inches of precipitation in a normal year, including roughly 56 inches of snow. The wettest months are June, July and August (4.1 inches in June). Inside the workable window, April and October are the driest, at 3.0 and 2.7 inches. The station averages about 6 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 | 26 | 11 | 1.4 | Cold |
| Feb | 29 | 13 | 1.2 | Cold |
| Mar | 40 | 24 | 2.0 | Cold |
| Apr | 54 | 35 | 3.0 | Workable |
| May | 67 | 46 | 3.4 | Workable |
| Jun | 77 | 56 | 4.1 | Workable |
| Jul | 81 | 60 | 3.6 | Workable |
| Aug | 79 | 58 | 3.4 | Workable |
| Sep | 72 | 50 | 3.2 | Workable |
| Oct | 58 | 40 | 2.7 | Workable |
| Nov | 44 | 29 | 2.0 | Cold |
| Dec | 31 | 18 | 1.8 | Cold |
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Home addition in Green Bay: your questions
+How much does it cost to build a home addition in Green Bay?
For 300 sq ft, expect $39,400 to $79,600 in the Green Bay area. A standard-spec job lands at $51,400 to $67,600. Small jobs usually cost more per sq ft and large ones less.
+What is the price per sq ft for home addition in Green Bay?
About $130 to $259 per sq ft for materials and labor, plus $470 to $1,850 for the permit if one is needed. The US range is $125 to $250.
+Is home addition cheaper in Green Bay or Appleton?
Appleton is 20 miles away. The midpoint for 300 sq ft there is $60,100, which is 1% more than Green Bay ($59,500). Wage and materials indexes both feed that gap.
+How much of the bill is labor in Green Bay?
About 70% at the midpoint, or $41,500 out of $59,500. Materials are 28% and permits 2%. Nationally, labor is 67%.
+What would 20x20 room (400 sq ft) cost in Green Bay?
$52,300 to $105,500. Pick a different size in the estimator above to get your own number.
+Does home addition need a permit in Green Bay?
Often, but rules are set by your city or county building office, so call before you hire. Budget $470 to $1,850 for fees in the Green Bay area (our national range of $500 to $2,000 scaled by the local price level).
+Is Green Bay expensive for home addition compared with the rest of Wisconsin?
Green Bay is 0% 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 Green Bay?
The BLS median is $29.00 an hour in the Green Bay area, compared with $29.12 nationally. The 25th to 75th percentile range is $23.46 to $36.01.
+What do basic and premium home addition work cost in Green Bay?
For 300 sq ft, basic work runs $39,400 to $55,500 and premium work $63,500 to $79,600. 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 Green Bay?
Based on NOAA 1991-2020 normals, the comfortable months for this kind of work are April through October. April 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 Green Bay
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.