Home addition cost in Maine
Statewide estimate from BLS wages and BEA prices. Reviewed Nov 4, 2026.
- Statewide range (300 sq ft)
- $38,200 – $77,400
- Per sq ft
- $126 – $252
- before permit
- Versus US midpoint
- +1%
- US $57,500
- Metros covered
- 2
Across Maine, a home addition costs about $38,200 to $77,400 for 300 sq ft. Statewide, that midpoint is 1% above the US figure of $57,500. Carpenters earn a median $29.88 an hour in Maine (US: $29.12).
Inside Maine, the metros we cover range from $54,400 (Bangor) to $58,900 (Portland) at the midpoint.
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Estimated cost for 300 sq ft in Maine (statewide), standard level
$50,000 to $65,700
About $164 to $214 per sq ft before permits. Labor is about 68% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $15,200 | $19,800 |
| Labor | $33,900 | $44,300 |
| Permits and fees | $920 | $1,500 |
| Total | $50,000 | $65,700 |
Cost breakdown for 300 sq ft in Maine
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $11,700 | $17,500 | $23,300 | 30% |
| Labor | $26,100 | $39,100 | $52,200 | 68% |
| Permits and fees | $490 | $1,200 | $1,950 | 2% |
| Total | $38,200 | $57,800 | $77,400 | 100% |
Basic, standard or premium: Maine prices
Bands overlap on purpose, since a good standard job can cost as much as a light premium one. Below are the three bands for the default size, then a grid from bump-out (100 sq ft) to large suite (600 sq ft).
Basic
$38,200 to $53,900
Bump-out or simple room without plumbing
Standard
$50,000 to $65,700
Standard room addition with HVAC and electrical
Premium
$61,700 to $77,400
Large addition with bath or kitchen and a new foundation
| Size | Basic | Standard | Premium |
|---|---|---|---|
| bump-out (100 sq ft) | $13,100 – $18,700 | $17,300 – $22,900 | $21,500 – $27,100 |
| 20x20 room (400 sq ft) | $50,800 – $71,500 | $66,300 – $87,000 | $81,900 – $102,500 |
| large suite (600 sq ft) | $76,000 – $106,500 | $99,000 – $130,000 | $122,000 – $153,000 |
Weather windows across Maine
Weather decides when digging and ground work can happen, and Maine is not uniform. The table uses NOAA's 1991-2020 climate normals from the weather station nearest each metro we cover, and counts the months that are neither cold nor hot enough to complicate the job.
Portland has the longest comfortable season of the metros we cover in Maine at 7 months (April through October); Bangor has the shortest at 6 (May through October). Rainfall runs from 42 inches a year in Bangor to 48 inches in Portland.
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 |
|---|---|---|---|---|
| Portland | 16 | 80 | 48 | 7: April through October |
| Bangor | 9 | 80 | 42 | 6: May through October |
Which Maine city is cheapest for home addition?
1 of the 2 metros sit above the statewide midpoint of $57,800, and the top-to-bottom gap is 8%. 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 |
|---|---|---|---|
| Portland, ME | $38,900 – $78,800 | $58,900 | +2% |
| Bangor, ME | $35,900 – $72,900 | $54,400 | −6% |
Other Maine jobs that often go with home addition
Each project weights the trades differently, so Maine's wage level does not push every price by the same amount. Compared with the US midpoint, bathroom remodel is +5% and roof replacement −6%.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Kitchen remodel | 120 sq ft | $18,400 – $31,300 | −1% |
| Bathroom remodel | 45 sq ft | $4,900 – $24,400 | +5% |
| Detached garage | 576 sq ft | $28,800 – $57,700 | −1% |
| Roof replacement | 2,000 sq ft of roof | $5,700 – $11,800 | −6% |
Maine versus the states around it
Maine ranks 23 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. Maine sits at $57,800. The five states closest by workforce center are listed below.
| State | Distance | Range | Midpoint | vs. here |
|---|---|---|---|---|
| New Hampshire | 110 miles away | $38,300 – $77,600 | $58,000 | level |
| Massachusetts | 120 miles away | $44,400 – $89,800 | $67,100 | +16% |
| Vermont | 150 miles away | $38,400 – $77,700 | $58,100 | level |
| Rhode Island | 170 miles away | $38,700 – $78,500 | $58,600 | +1% |
| Connecticut | 220 miles away | $40,000 – $81,000 | $60,500 | +5% |
Wages behind the Maine number
Maine's labor line is priced from 6 trades, each compared with its US median wage. After weighting by each trade's share of the work, the state comes out at 1.02 times the national level.
Carpenters (47-2031), 50% of the weighting: a median of $29.88 an hour, in line with the US median of $29.12. The middle half of them earn between $25.46 and $35.00 an hour. About 5,170 work in the state. That is 80.7 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 $26.77 an hour, in line with the US median of $27.41. The middle half of them earn between $21.69 and $30.04 an hour. About 730 work in the state. That is 11.4 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 $36.24 an hour, which is 19% above the national $30.38. The middle half of them earn between $30.25 and $40.57 an hour. BLS counts 3,780 of them working in the state, 59.0 for every 10,000 jobs (US: 48.7), so the local bench is deeper than average.
Plumbers, pipefitters and steamfitters (47-2152), 10% of the weighting: a median of $30.77 an hour, in line with the US median of $30.67. The middle half of them earn between $29.47 and $36.41 an hour. About 2,710 work in the state. That is 42.3 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 $28.89 an hour, which is in line with the national $28.33. The middle half of them earn between $25.17 and $30.98 an hour. BLS counts 150 of them working in the state, 2.3 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 $24.10 an hour, 10% below the US median of $26.65. The middle half of them earn between $22.63 and $28.40 an hour. About 610 work in the state. That is 9.5 per 10,000 jobs, compared with 8.7 nationally, so the supply of crews looks typical.
A crew paid at the 75th percentile for carpenters ($35.00 an hour) would add about $3,350 to the statewide midpoint; one at the 25th percentile ($25.46) would take off about $2,900. Use that as a rough guide to how far a bid can sit from our midpoint on wages alone.
BLS counts 640,610 jobs across Maine (May 2025), which is 0.4% of US employment.
| Trade | Weight | 25th pct | Median | 75th pct | US median | Ratio | Level used |
|---|---|---|---|---|---|---|---|
| Carpenters (47-2031) | 50% | $25.46 | $29.88 | $35.00 | $29.12 | 1.03 | state |
| Cement masons and concrete finishers (47-2051) | 10% | $21.69 | $26.77 | $30.04 | $27.41 | 0.98 | state |
| Electricians (47-2111) | 10% | $30.25 | $36.24 | $40.57 | $30.38 | 1.19 | state |
| Plumbers, pipefitters and steamfitters (47-2152) | 10% | $29.47 | $30.77 | $36.41 | $30.67 | 1.00 | state |
| Drywall and ceiling tile installers (47-2081) | 10% | $25.17 | $28.89 | $30.98 | $28.33 | 1.02 | state |
| Roofers (47-2181) | 10% | $22.63 | $24.10 | $28.40 | $26.65 | 0.90 | state |
| Blended | 100% | 1.02 | |||||
Why two Maine quotes can differ
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.
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Home addition in Maine: your questions
+How much does it cost to build a home addition in Maine?
$38,200 to $77,400 for 300 sq ft, using statewide wages and prices. Metro areas inside Maine can sit above or below that.
+Which city in Maine is cheapest for home addition?
Bangor at about $54,400 (midpoint, 300 sq ft). The priciest is Portland at $58,900.
+Is home addition cheaper in Maine than the US average?
It is 1% more expensive: $57,800 against $57,500 for 300 sq ft at the midpoint.
+What share of the price is labor in Maine?
About 68% ($39,100). Materials are 30%. Statewide labor for this job is weighted 1.02x the national wage level.
+What do carpenters earn in Maine?
The BLS statewide median is $29.88 an hour, against $29.12 for the US. The 25th to 75th percentile range is $25.46 to $35.00.
+Where does Maine rank for home addition costs?
23rd most expensive of 51 (the 50 states plus DC) at the midpoint, $57,800 for 300 sq ft. Rank 1 is the costliest.
+What do basic and premium home addition work cost in Maine?
For 300 sq ft, basic work runs $38,200 to $53,900 and premium work $61,700 to $77,400. 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 Maine?
Yes where winters or summers are hard. Of the Maine metros we cover, Portland 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 Maine
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.