Home addition cost in Ann Arbor, MI
Local estimate from BLS wage data and BEA price levels. Reviewed Nov 4, 2026.
- Typical range (300 sq ft)
- $39,900 – $80,800
- Per sq ft
- $131 – $263
- before permit
- Versus US midpoint
- +5%
- US $57,500
- Rank of 300 metros
- #72
- 1 = most expensive
Ann Arbor homeowners pay roughly $39,900 to $80,800 to build a home addition at 300 sq ft, or $131 to $263 per sq ft (permit not included). Against the US midpoint, Ann Arbor is 5% higher. Carpenters earn a median of $31.33 an hour in the Ann Arbor area, 8% above the US median of $29.12.
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Estimated cost for 300 sq ft in Ann Arbor, MI, standard level
$52,200 to $68,600
About $171 to $223 per sq ft before permits. Labor is about 70% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $14,600 | $19,100 |
| Labor | $36,600 | $47,900 |
| Permits and fees | $960 | $1,550 |
| Total | $52,200 | $68,600 |
Cost breakdown for 300 sq ft in Ann Arbor, MI
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $11,200 | $16,900 | $22,500 | 28% |
| Labor | $28,200 | $42,300 | $56,300 | 70% |
| Permits and fees | $500 | $1,250 | $2,000 | 2% |
| Total | $39,900 | $60,400 | $80,800 | 100% |
Where the Ann Arbor price comes from
Labor is 70% of the midpoint bill here, against 67% nationally. The mix of trades behind this job is carpenters (50%), cement masons and concrete finishers (10%), electricians (10%), plumbers, pipefitters and steamfitters (10%), drywall and ceiling tile installers (10%), roofers (10%). We weight each trade's local median wage by that share and compare it with the national median. In Ann Arbor the blended ratio comes out at 1.10.
On the materials line, the BEA goods price index for the Ann Arbor metro is 93.7 (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 (100.9) and land at $500 to $2,000.
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 Ann Arbor. The wage table below marks each row.
Planning more than one job in Ann Arbor?
Because every project leans on different trades, Ann Arbor's wage level does not move all prices equally. Against the US midpoint, roof replacement runs +4% and kitchen remodel −3%.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Kitchen remodel | 120 sq ft | $18,000 – $30,700 | −3% |
| Bathroom remodel | 45 sq ft | $4,800 – $23,700 | +2% |
| Detached garage | 576 sq ft | $29,400 – $59,100 | +2% |
| Roof replacement | 2,000 sq ft of roof | $6,500 – $13,000 | +4% |
How Ann Arbor compares
Of the five closest metros, 4 are cheaper than Ann Arbor. Toledo is the lowest at about $58,100 (midpoint, 300 sq ft), 50 miles away.
| Area | Range | Midpoint | vs. here |
|---|---|---|---|
| Ann Arbor, MIthis page | $39,900 – $80,800 | $60,400 | |
| Detroit, MI45 miles | $41,300 – $83,600 | $62,400 | +3% |
| Toledo, OH50 miles | $38,400 – $77,700 | $58,100 | −4% |
| Lansing, MI50 miles | $39,200 – $79,400 | $59,300 | −2% |
| Flint, MI55 miles | $39,500 – $79,900 | $59,700 | −1% |
| Saginaw, MI75 miles | $39,000 – $78,800 | $58,900 | −2% |
| Michigan (statewide) | $39,200 – $79,400 | $59,300 | −2% |
| United States | $38,000 – $77,000 | $57,500 | −5% |
Across 300 US metros, Ann Arbor comes in at #72 from the top. The priciest is Honolulu, HI at $79,600; the cheapest is Brownsville, TX at $44,300 (midpoints, 300 sq ft). Statewide, Ann Arbor is 2% above the Michigan figure.
Other Michigan metros
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Detroit, MI | 1,904,530 jobs | $41,300 – $83,600 | $62,400 | +3% |
| Grand Rapids, MI | 598,260 jobs | $37,400 – $75,700 | $56,500 | −6% |
| Lansing, MI | 217,180 jobs | $39,200 – $79,400 | $59,300 | −2% |
| Flint, MI | 135,040 jobs | $39,500 – $79,900 | $59,700 | −1% |
| Kalamazoo, MI | 121,790 jobs | $38,500 – $77,900 | $58,200 | −4% |
| Saginaw, MI | 80,000 jobs | $39,000 – $78,800 | $58,900 | −2% |
Cities with a workforce like Ann Arbor's
Big cities and small ones price differently, so here is Ann Arbor against the 4 metros with the closest total employment.
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Deltona, FL | 219,740 jobs | $32,200 – $65,500 | $48,900 | −19% |
| Lansing, MI | 217,180 jobs | $39,200 – $79,400 | $59,300 | −2% |
| Springfield, MO | 223,030 jobs | $34,700 – $70,200 | $52,400 | −13% |
| Santa Rosa, CA | 205,260 jobs | $45,100 – $91,300 | $68,200 | +13% |
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 Ann Arbor is 1.10 times the national level.
For carpenters (47-2031, weighted 50%) the local median is $31.33 an hour, which is 8% above the national $29.12. The middle half of them earn between $26.61 and $36.52 an hour. BLS counts 640 of them working in the area, 29.1 for every 10,000 jobs (US: 43.1), so the local bench is thinner than average.
For cement masons and concrete finishers (47-2051, weighted 10%) the local median is $28.67 an hour, which is 5% above the national $27.41. The middle half of them earn between $23.09 and $34.95 an hour. BLS counts 160 of them working in the area, 7.3 for every 10,000 jobs (US: 13.3), so the local bench is thinner than average.
Electricians (47-2111), 10% of the weighting: a median of $39.16 an hour, 29% above the US median of $30.38. The middle half of them earn between $29.29 and $50.13 an hour. About 610 work in the metro. That is 27.8 per 10,000 jobs, compared with 48.7 nationally, so expect fewer local crews to bid.
For plumbers, pipefitters and steamfitters (47-2152, weighted 10%) the local median is $37.60 an hour, which is 23% above the national $30.67. The middle half of them earn between $27.89 and $49.17 an hour. BLS counts 420 of them working in the area, 19.1 for every 10,000 jobs (US: 30.0), so the local bench is thinner than average.
Drywall and ceiling tile installers (47-2081) carry 10% of the labor weighting. BLS does not publish this trade for the Ann Arbor metro, so we used the Michigan statewide median: $28.10 an hour against $28.33 for the US. The middle half of them earn between $22.82 and $34.00 an hour.
For roofers (47-2181, weighted 10%) the local median is $29.68 an hour, which is 11% above the national $26.65. The middle half of them earn between $22.75 and $44.17 an hour. BLS counts 80 of them working in the area, 3.6 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 ($36.52 an hour) instead of the median, the labor line grows by about $3,400. At the 25th percentile ($26.61) it shrinks by about $3,100. The total moves by 5.6% or 5.1%, so wages alone rarely explain a quote that is far outside our range.
For context on the local economy, BLS counts 219,730 jobs in the Ann Arbor area. That makes it the 110th largest of the 300 metros we cover, with 0.14% of US employment.
| Trade | Weight | 25th pct | Median | 75th pct | US median | Ratio | Level used |
|---|---|---|---|---|---|---|---|
| Carpenters (47-2031) | 50% | $26.61 | $31.33 | $36.52 | $29.12 | 1.08 | metro |
| Cement masons and concrete finishers (47-2051) | 10% | $23.09 | $28.67 | $34.95 | $27.41 | 1.05 | metro |
| Electricians (47-2111) | 10% | $29.29 | $39.16 | $50.13 | $30.38 | 1.29 | metro |
| Plumbers, pipefitters and steamfitters (47-2152) | 10% | $27.89 | $37.60 | $49.17 | $30.67 | 1.23 | metro |
| Drywall and ceiling tile installers (47-2081) | 10% | $22.82 | $28.10 | $34.00 | $28.33 | 0.99 | state |
| Roofers (47-2181) | 10% | $22.75 | $29.68 | $44.17 | $26.65 | 1.11 | metro |
| Blended | 100% | 1.10 | |||||
Pick a size, pick a tier: home addition pricing in Ann Arbor
Three bands are cut from the same cited range and localized for Ann Arbor 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
$39,900 to $56,300
Bump-out or simple room without plumbing
Standard
$52,200 to $68,600
Standard room addition with HVAC and electrical
Premium
$64,500 to $80,800
Large addition with bath or kitchen and a new foundation
| Size | Basic | Standard | Premium |
|---|---|---|---|
| bump-out (100 sq ft) | $13,600 – $19,500 | $18,000 – $23,900 | $22,400 – $28,300 |
| 20x20 room (400 sq ft) | $53,100 – $74,700 | $69,300 – $90,900 | $85,500 – $107,000 |
| large suite (600 sq ft) | $79,300 – $111,500 | $103,500 – $135,500 | $127,500 – $159,500 |
Specs and site conditions that change a Ann Arbor bid
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).
When to schedule home addition in Ann Arbor
We use NOAA's 1991-2020 climate normals for Ann Arbor Muni Ap (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 Ann Arbor (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 150 days a year with a low at or below 32°F at this station.
Ann Arbor gets about 30 inches of precipitation in a normal year. The wettest months are May, June and July (3.6 inches in June). Inside the workable window, August and October are the driest, at 2.7 and 2.2 inches. The station averages about 11 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 | 32 | 15 | 1.7 | Cold |
| Feb | 35 | 16 | 1.5 | Cold |
| Mar | 45 | 25 | 1.9 | Cold |
| Apr | 59 | 35 | 3.0 | Workable |
| May | 70 | 46 | 3.4 | Workable |
| Jun | 79 | 54 | 3.6 | Workable |
| Jul | 84 | 57 | 3.2 | Workable |
| Aug | 81 | 57 | 2.7 | Workable |
| Sep | 74 | 48 | 2.8 | Workable |
| Oct | 62 | 38 | 2.2 | Workable |
| Nov | 48 | 30 | 2.1 | Cold |
| Dec | 36 | 22 | 1.7 | 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 $52,200 to $68,600 for Ann Arbor, MI is attached.
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Home addition in Ann Arbor: your questions
+How much does it cost to build a home addition in Ann Arbor?
For 300 sq ft, expect $39,900 to $80,800 in the Ann Arbor area. A standard-spec job lands at $52,200 to $68,600. Small jobs usually cost more per sq ft and large ones less.
+What is the price per sq ft for home addition in Ann Arbor?
About $131 to $263 per sq ft for materials and labor, plus $500 to $2,000 for the permit if one is needed. The US range is $125 to $250.
+Is home addition cheaper in Ann Arbor or Detroit?
Detroit is 45 miles away. The midpoint for 300 sq ft there is $62,400, which is 3% more than Ann Arbor ($60,400). Wage and materials indexes both feed that gap.
+How much of the bill is labor in Ann Arbor?
About 70% at the midpoint, or $42,300 out of $60,400. Materials are 28% and permits 2%. Nationally, labor is 67%.
+What would 20x20 room (400 sq ft) cost in Ann Arbor?
$53,100 to $107,000. Pick a different size in the estimator above to get your own number.
+Does home addition need a permit in Ann Arbor?
Often, but rules are set by your city or county building office, so call before you hire. Budget $500 to $2,000 for fees in the Ann Arbor area (our national range of $500 to $2,000 scaled by the local price level).
+Is Ann Arbor expensive for home addition compared with the rest of Michigan?
Ann Arbor is 2% above the Michigan statewide estimate ($59,300 at the midpoint). We cover 10 metros in Michigan; see the state page to compare them.
+What do carpenters earn in Ann Arbor?
The BLS median is $31.33 an hour in the Ann Arbor area, compared with $29.12 nationally. The 25th to 75th percentile range is $26.61 to $36.52.
+What do basic and premium home addition work cost in Ann Arbor?
For 300 sq ft, basic work runs $39,900 to $56,300 and premium work $64,500 to $80,800. 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 Ann Arbor?
Based on NOAA 1991-2020 normals, the comfortable months for this kind of work are April through October. August 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 Ann Arbor
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.