Home addition cost in New Hampshire
Statewide estimate from BLS wages and BEA prices. Reviewed Nov 4, 2026.
- Statewide range (300 sq ft)
- $38,300 – $77,600
- Per sq ft
- $126 – $252
- before permit
- Versus US midpoint
- +1%
- US $57,500
- Metros covered
- 1
New Hampshire prices for home addition: $38,300 to $77,600 for 300 sq ft, or $126 to $252 per sq ft without the permit. The state midpoint is 1% above the national one. Local wages for carpenters are $29.42 an hour.
New Hampshire has one metro in our dataset, Manchester, so the statewide and metro figures are close. The state figure uses BLS statewide wages, which include rural areas.
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Estimated cost for 300 sq ft in New Hampshire (statewide), standard level
$50,100 to $65,800
About $164 to $214 per sq ft before permits. Labor is about 67% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $15,400 | $20,100 |
| Labor | $33,700 | $44,100 |
| Permits and fees | $990 | $1,600 |
| Total | $50,100 | $65,800 |
Cost breakdown for 300 sq ft in New Hampshire
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $11,800 | $17,700 | $23,700 | 31% |
| Labor | $25,900 | $38,900 | $51,900 | 67% |
| Permits and fees | $520 | $1,300 | $2,100 | 2% |
| Total | $38,300 | $58,000 | $77,600 | 100% |
What carpenters and the other trades earn in New Hampshire
New Hampshire'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 $29.42 an hour, in line with the US median of $29.12. The middle half of them earn between $24.12 and $35.46 an hour. About 3,760 work in the state. That is 55.0 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 $26.06 an hour, 5% below the US median of $27.41. The middle half of them earn between $23.26 and $31.63 an hour. About 300 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 $30.21 an hour, which is in line with the national $30.38. The middle half of them earn between $23.28 and $37.68 an hour. BLS counts 3,330 of them working in the state, 48.7 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 $32.12 an hour, 5% above the US median of $30.67. The middle half of them earn between $25.29 and $37.06 an hour. About 1,950 work in the state. That is 28.5 per 10,000 jobs, compared with 30.0 nationally, so the supply of crews looks typical.
For drywall and ceiling tile installers (47-2081, weighted 10%) the local median is $29.79 an hour, which is 5% above the national $28.33. The middle half of them earn between $26.77 and $36.00 an hour. BLS counts 370 of them working in the state, 5.4 for every 10,000 jobs (US: 5.3), so the local bench is about average.
Roofers (47-2181), 10% of the weighting: a median of $28.76 an hour, 8% above the US median of $26.65. The middle half of them earn between $23.40 and $34.80 an hour. About 270 work in the state. That is 4.0 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 ($35.46 an hour) would add about $3,950 to the statewide midpoint; one at the 25th percentile ($24.12) would take off about $3,500. Use that as a rough guide to how far a bid can sit from our midpoint on wages alone.
BLS counts 683,290 jobs across New Hampshire (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% | $24.12 | $29.42 | $35.46 | $29.12 | 1.01 | state |
| Cement masons and concrete finishers (47-2051) | 10% | $23.26 | $26.06 | $31.63 | $27.41 | 0.95 | state |
| Electricians (47-2111) | 10% | $23.28 | $30.21 | $37.68 | $30.38 | 0.99 | state |
| Plumbers, pipefitters and steamfitters (47-2152) | 10% | $25.29 | $32.12 | $37.06 | $30.67 | 1.05 | state |
| Drywall and ceiling tile installers (47-2081) | 10% | $26.77 | $29.79 | $36.00 | $28.33 | 1.05 | state |
| Roofers (47-2181) | 10% | $23.40 | $28.76 | $34.80 | $26.65 | 1.08 | state |
| Blended | 100% | 1.02 | |||||
Why two New Hampshire 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.
New Hampshire metro-by-metro prices
New Hampshire has one metro in our dataset, Manchester, so the statewide and metro figures are close. The state figure uses BLS statewide wages, which include rural areas. 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 |
|---|---|---|---|
| Manchester, NH | $38,400 – $77,800 | $58,100 | level |
When New Hampshire weather lets you build
Weather decides when digging and ground work can happen, and New Hampshire 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.
Manchester has 8 comfortable months (April through November), with about 40 inches of precipitation a year.
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 |
|---|---|---|---|---|
| Manchester | 17 | 84 | 40 | 8: April through November |
Basic, standard or premium: New Hampshire 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
$38,300 to $54,000
Bump-out or simple room without plumbing
Standard
$50,100 to $65,800
Standard room addition with HVAC and electrical
Premium
$61,900 to $77,600
Large addition with bath or kitchen and a new foundation
| Size | Basic | Standard | Premium |
|---|---|---|---|
| bump-out (100 sq ft) | $13,100 – $18,800 | $17,400 – $23,000 | $21,600 – $27,300 |
| 20x20 room (400 sq ft) | $50,900 – $71,700 | $66,500 – $87,200 | $82,000 – $103,000 |
| large suite (600 sq ft) | $76,100 – $107,000 | $99,200 – $130,000 | $122,500 – $153,000 |
If you are planning more than one job in New Hampshire
Each project weights the trades differently, so New Hampshire's wage level does not push every price by the same amount. Compared with the US midpoint, roof replacement is +4% and bathroom remodel −1%.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Kitchen remodel | 120 sq ft | $18,300 – $31,300 | −1% |
| Bathroom remodel | 45 sq ft | $4,650 – $23,100 | −1% |
| Detached garage | 576 sq ft | $29,000 – $58,200 | level |
| Roof replacement | 2,000 sq ft of roof | $6,400 – $13,000 | +4% |
New Hampshire against its neighbors
New Hampshire ranks 22 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. New Hampshire sits at $58,000. The five states closest by workforce center are listed below.
| State | Distance | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Massachusetts | 40 miles away | $44,400 – $89,800 | $67,100 | +16% |
| Rhode Island | 90 miles away | $38,700 – $78,500 | $58,600 | +1% |
| Maine | 110 miles away | $38,200 – $77,400 | $57,800 | level |
| Connecticut | 110 miles away | $40,000 – $81,000 | $60,500 | +4% |
| Vermont | 140 miles away | $38,400 – $77,700 | $58,100 | level |
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Home addition in New Hampshire: your questions
+How much does it cost to build a home addition in New Hampshire?
$38,300 to $77,600 for 300 sq ft, using statewide wages and prices. Metro areas inside New Hampshire can sit above or below that.
+Which city in New Hampshire is cheapest for home addition?
Manchester at about $58,100 (midpoint, 300 sq ft).
+Is home addition cheaper in New Hampshire than the US average?
It is 1% more expensive: $58,000 against $57,500 for 300 sq ft at the midpoint.
+What share of the price is labor in New Hampshire?
About 67% ($38,900). Materials are 31%. Statewide labor for this job is weighted 1.02x the national wage level.
+What do carpenters earn in New Hampshire?
The BLS statewide median is $29.42 an hour, against $29.12 for the US. The 25th to 75th percentile range is $24.12 to $35.46.
+Where does New Hampshire rank for home addition costs?
22nd most expensive of 51 (the 50 states plus DC) at the midpoint, $58,000 for 300 sq ft. Rank 1 is the costliest.
+What do basic and premium home addition work cost in New Hampshire?
For 300 sq ft, basic work runs $38,300 to $54,000 and premium work $61,900 to $77,600. 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 New Hampshire?
Yes where winters or summers are hard. Of the New Hampshire metros we cover, Manchester 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 New Hampshire
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.