Home addition cost in Massachusetts
Statewide estimate from BLS wages and BEA prices. Reviewed Nov 4, 2026.
- Statewide range (300 sq ft)
- $44,400 – $89,800
- Per sq ft
- $146 – $292
- before permit
- Versus US midpoint
- +17%
- US $57,500
- Metros covered
- 6
Massachusetts prices for home addition: $44,400 to $89,800 for 300 sq ft, or $146 to $292 per sq ft without the permit. The state midpoint is 17% above the national one. Local wages for carpenters are $36.16 an hour.
Inside Massachusetts, the metros we cover range from $60,700 (Pittsfield) to $68,100 (Worcester) at the midpoint. Pick your closest city in the table for a tighter number.
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Estimated cost for 300 sq ft in Massachusetts (statewide), standard level
$58,000 to $76,200
About $190 to $249 per sq ft before permits. Labor is about 72% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $15,400 | $20,200 |
| Labor | $41,600 | $54,400 |
| Permits and fees | $1,000 | $1,650 |
| Total | $58,000 | $76,200 |
Cost breakdown for 300 sq ft in Massachusetts
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $11,900 | $17,800 | $23,700 | 27% |
| Labor | $32,000 | $48,000 | $64,000 | 72% |
| Permits and fees | $530 | $1,300 | $2,100 | 2% |
| Total | $44,400 | $67,100 | $89,800 | 100% |
Why two Massachusetts 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.
Massachusetts versus the states around it
Massachusetts ranks 5 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. Massachusetts sits at $67,100. The five states closest by workforce center are listed below.
| State | Distance | Range | Midpoint | vs. here |
|---|---|---|---|---|
| New Hampshire | 40 miles away | $38,300 – $77,600 | $58,000 | −14% |
| Rhode Island | 50 miles away | $38,700 – $78,500 | $58,600 | −13% |
| Connecticut | 110 miles away | $40,000 – $81,000 | $60,500 | −10% |
| Maine | 120 miles away | $38,200 – $77,400 | $57,800 | −14% |
| Vermont | 180 miles away | $38,400 – $77,700 | $58,100 | −13% |
Massachusetts metro-by-metro prices
1 of the 6 metros sit above the statewide midpoint of $67,100, and the top-to-bottom gap is 12%. 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 |
|---|---|---|---|
| Worcester, MA | $45,000 – $91,100 | $68,100 | +1% |
| Boston, MA | $44,300 – $89,700 | $67,000 | level |
| Springfield, MA | $44,200 – $89,300 | $66,800 | −1% |
| Barnstable, MA | $42,400 – $85,800 | $64,100 | −4% |
| Amherst, MA | $41,700 – $84,300 | $63,000 | −6% |
| Pittsfield, MA | $40,100 – $81,200 | $60,700 | −10% |
Basic, standard or premium: Massachusetts 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
$44,400 to $62,600
Bump-out or simple room without plumbing
Standard
$58,000 to $76,200
Standard room addition with HVAC and electrical
Premium
$71,700 to $89,800
Large addition with bath or kitchen and a new foundation
| Size | Basic | Standard | Premium |
|---|---|---|---|
| bump-out (100 sq ft) | $15,100 – $21,600 | $20,000 – $26,500 | $24,900 – $31,400 |
| 20x20 room (400 sq ft) | $59,000 – $83,000 | $77,000 – $101,000 | $95,000 – $119,000 |
| large suite (600 sq ft) | $88,200 – $124,000 | $115,000 – $151,000 | $142,000 – $177,500 |
Other Massachusetts jobs that often go with home addition
Each project weights the trades differently, so Massachusetts's wage level does not push every price by the same amount. Compared with the US midpoint, roof replacement is +19% and kitchen remodel +5%.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Kitchen remodel | 120 sq ft | $19,400 – $33,100 | +5% |
| Bathroom remodel | 45 sq ft | $5,550 – $27,400 | +18% |
| Detached garage | 576 sq ft | $32,400 – $65,100 | +12% |
| Roof replacement | 2,000 sq ft of roof | $7,500 – $14,700 | +19% |
Massachusetts seasons and home addition
Weather decides when digging and ground work can happen, and Massachusetts 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.
Boston has the longest comfortable season of the metros we cover in Massachusetts at 8 months (April through November); Pittsfield has the shortest at 7 (April through October). Rainfall runs from 44 inches a year in Boston to 48 inches in Worcester.
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 |
|---|---|---|---|---|
| Boston | 23 | 82 | 44 | 8: April through November |
| Worcester | 17 | 80 | 48 | 8: April through November |
| Springfield | 16 | 85 | 45 | 7: April through October |
| Barnstable | 24 | 81 | 45 | 8: April through November |
| Amherst | 16 | 85 | 45 | 7: April through October |
| Pittsfield | 14 | 79 | 44 | 7: April through October |
Wages behind the Massachusetts number
Massachusetts'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 1.25 times the national level.
Carpenters (47-2031), 50% of the weighting: a median of $36.16 an hour, 24% above the US median of $29.12. The middle half of them earn between $29.21 and $46.88 an hour. About 18,540 work in the state. That is 51.0 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 $30.69 an hour, 12% above the US median of $27.41. The middle half of them earn between $26.87 and $37.60 an hour. About 1,590 work in the state. That is 4.4 per 10,000 jobs, compared with 13.3 nationally, so expect fewer local crews to bid.
For electricians (47-2111, weighted 10%) the local median is $38.18 an hour, which is 26% above the national $30.38. The middle half of them earn between $27.82 and $48.31 an hour. BLS counts 17,810 of them working in the state, 49.0 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 $45.14 an hour, 47% above the US median of $30.67. The middle half of them earn between $29.74 and $52.13 an hour. About 13,460 work in the state. That is 37.0 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 $33.42 an hour, which is 18% above the national $28.33. The middle half of them earn between $29.51 and $38.60 an hour. BLS counts 590 of them working in the state, 1.6 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 $34.98 an hour, 31% above the US median of $26.65. The middle half of them earn between $28.78 and $39.95 an hour. About 1,950 work in the state. That is 5.4 per 10,000 jobs, compared with 8.7 nationally, so expect fewer local crews to bid.
A crew paid at the 75th percentile for carpenters ($46.88 an hour) would add about $7,050 to the statewide midpoint; one at the 25th percentile ($29.21) would take off about $4,550. Use that as a rough guide to how far a bid can sit from our midpoint on wages alone.
BLS counts 3,637,650 jobs across Massachusetts (May 2025), which is 2.3% of US employment.
| Trade | Weight | 25th pct | Median | 75th pct | US median | Ratio | Level used |
|---|---|---|---|---|---|---|---|
| Carpenters (47-2031) | 50% | $29.21 | $36.16 | $46.88 | $29.12 | 1.24 | state |
| Cement masons and concrete finishers (47-2051) | 10% | $26.87 | $30.69 | $37.60 | $27.41 | 1.12 | state |
| Electricians (47-2111) | 10% | $27.82 | $38.18 | $48.31 | $30.38 | 1.26 | state |
| Plumbers, pipefitters and steamfitters (47-2152) | 10% | $29.74 | $45.14 | $52.13 | $30.67 | 1.47 | state |
| Drywall and ceiling tile installers (47-2081) | 10% | $29.51 | $33.42 | $38.60 | $28.33 | 1.18 | state |
| Roofers (47-2181) | 10% | $28.78 | $34.98 | $39.95 | $26.65 | 1.31 | state |
| Blended | 100% | 1.25 | |||||
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Home addition in Massachusetts: your questions
+How much does it cost to build a home addition in Massachusetts?
$44,400 to $89,800 for 300 sq ft, using statewide wages and prices. Metro areas inside Massachusetts can sit above or below that.
+Which city in Massachusetts is cheapest for home addition?
Pittsfield at about $60,700 (midpoint, 300 sq ft). The priciest is Worcester at $68,100.
+Is home addition cheaper in Massachusetts than the US average?
It is 17% more expensive: $67,100 against $57,500 for 300 sq ft at the midpoint.
+What share of the price is labor in Massachusetts?
About 72% ($48,000). Materials are 27%. Statewide labor for this job is weighted 1.25x the national wage level.
+What do carpenters earn in Massachusetts?
The BLS statewide median is $36.16 an hour, against $29.12 for the US. The 25th to 75th percentile range is $29.21 to $46.88.
+Where does Massachusetts rank for home addition costs?
5th most expensive of 51 (the 50 states plus DC) at the midpoint, $67,100 for 300 sq ft. Rank 1 is the costliest.
+What do basic and premium home addition work cost in Massachusetts?
For 300 sq ft, basic work runs $44,400 to $62,600 and premium work $71,700 to $89,800. 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 Massachusetts?
Yes where winters or summers are hard. Of the Massachusetts metros we cover, Boston has the most comfortable months (8 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 Massachusetts
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.