Home addition cost in Manchester, NH
Local estimate from BLS wage data and BEA price levels. Reviewed Nov 4, 2026.
- Typical range (300 sq ft)
- $38,400 – $77,800
- Per sq ft
- $126 – $252
- before permit
- Versus US midpoint
- +1%
- US $57,500
- Rank of 300 metros
- #107
- 1 = most expensive
If you want to build a home addition in Manchester, plan on $38,400 to $77,800 for 300 sq ft, all in. Per sq ft, that is $126 to $252 for materials and labor, with the permit on top. The local midpoint lands close to the national one. Carpenters earn a median of $29.47 an hour in the Manchester area, 1% above the US median of $29.12.
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Estimated cost for 300 sq ft in Manchester, NH, standard level
$50,200 to $66,000
About $164 to $215 per sq ft before permits. Labor is about 67% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $15,200 | $19,900 |
| Labor | $34,000 | $44,400 |
| Permits and fees | $1,000 | $1,650 |
| Total | $50,200 | $66,000 |
Cost breakdown for 300 sq ft in Manchester, NH
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $11,700 | $17,600 | $23,400 | 30% |
| Labor | $26,100 | $39,200 | $52,300 | 67% |
| Permits and fees | $530 | $1,300 | $2,100 | 2% |
| Total | $38,400 | $58,100 | $77,800 | 100% |
Where the Manchester 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, Manchester wages are 1.02 times the national level. Labor makes up about 67% of the midpoint estimate (67% at national prices).
On the materials line, the BEA goods price index for the Manchester metro is 97.7 (US = 100). The midpoint materials bill for 300 sq ft comes to $17,600, compared with $18,000 at national prices. Permit and inspection fees are scaled by the broader index (105.7) and land at $530 to $2,100.
Manchester labor market for home addition
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 Manchester is 1.02 times the national level.
For carpenters (47-2031, weighted 50%) the local median is $29.47 an hour, which is in line with the national $29.12. The middle half of them earn between $23.91 and $35.02 an hour. BLS counts 820 of them working in the area, 41.1 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 $27.38 an hour, which is in line with the national $27.41. The middle half of them earn between $22.98 and $29.00 an hour. BLS counts 80 of them working in the area, 4.0 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 $30.81 an hour, in line with the US median of $30.38. The middle half of them earn between $22.83 and $38.66 an hour. About 970 work in the metro. That is 48.6 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 $32.54 an hour, which is 6% above the national $30.67. The middle half of them earn between $24.16 and $36.93 an hour. BLS counts 660 of them working in the area, 33.1 for every 10,000 jobs (US: 30.0), so the local bench is about average.
Drywall and ceiling tile installers (47-2081), 10% of the weighting: a median of $30.45 an hour, 7% above the US median of $28.33. The middle half of them earn between $27.99 and $34.63 an hour. About 160 work in the metro. That is 8.0 per 10,000 jobs, compared with 5.3 nationally, which suggests plenty of local crews to bid.
For roofers (47-2181, weighted 10%) the local median is $27.68 an hour, which is 4% above the national $26.65. The middle half of them earn between $22.89 and $32.09 an hour. BLS counts 110 of them working in the area, 5.5 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 ($35.02 an hour) instead of the median, the labor line grows by about $3,650. At the 25th percentile ($23.91) it shrinks by about $3,650. The total moves by 6.3% or 6.3%, so wages alone rarely explain a quote that is far outside our range.
For context on the local economy, BLS counts 199,560 jobs in the Manchester-Nashua area. That makes it the 115th largest of the 300 metros we cover, with 0.13% of US employment.
| Trade | Weight | 25th pct | Median | 75th pct | US median | Ratio | Level used |
|---|---|---|---|---|---|---|---|
| Carpenters (47-2031) | 50% | $23.91 | $29.47 | $35.02 | $29.12 | 1.01 | metro |
| Cement masons and concrete finishers (47-2051) | 10% | $22.98 | $27.38 | $29.00 | $27.41 | 1.00 | metro |
| Electricians (47-2111) | 10% | $22.83 | $30.81 | $38.66 | $30.38 | 1.01 | metro |
| Plumbers, pipefitters and steamfitters (47-2152) | 10% | $24.16 | $32.54 | $36.93 | $30.67 | 1.06 | metro |
| Drywall and ceiling tile installers (47-2081) | 10% | $27.99 | $30.45 | $34.63 | $28.33 | 1.07 | metro |
| Roofers (47-2181) | 10% | $22.89 | $27.68 | $32.09 | $26.65 | 1.04 | metro |
| Blended | 100% | 1.02 | |||||
Related projects, priced for Manchester
Because every project leans on different trades, Manchester's wage level does not move all prices equally. Against the US midpoint, roof replacement runs +1% and kitchen remodel −1%.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Kitchen remodel | 120 sq ft | $18,300 – $31,100 | −1% |
| Bathroom remodel | 45 sq ft | $4,650 – $23,100 | −1% |
| Detached garage | 576 sq ft | $28,800 – $57,800 | −1% |
| Roof replacement | 2,000 sq ft of roof | $6,200 – $12,700 | +1% |
Is Manchester cheap or dear? The local comparison
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 $58,100 to $68,100 across Manchester and its five closest metros.
| Area | Range | Midpoint | vs. here |
|---|---|---|---|
| Manchester, NHthis page | $38,400 – $77,800 | $58,100 | |
| Worcester, MA45 miles | $45,000 – $91,100 | $68,100 | +17% |
| Boston, MA45 miles | $44,300 – $89,700 | $67,000 | +15% |
| Amherst, MA60 miles | $41,700 – $84,300 | $63,000 | +8% |
| Springfield, MA70 miles | $44,200 – $89,300 | $66,800 | +15% |
| Portland, ME85 miles | $38,900 – $78,800 | $58,900 | +1% |
| New Hampshire (statewide) | $38,300 – $77,600 | $58,000 | level |
| United States | $38,000 – $77,000 | $57,500 | −1% |
Across 300 US metros, Manchester comes in at #107 from the top. The priciest is Honolulu, HI at $79,600; the cheapest is Brownsville, TX at $44,300 (midpoints, 300 sq ft). Statewide, Manchester is 0% above the New Hampshire figure.
Manchester is the only New Hampshire metro we cover, so the statewide page is the only in-state comparison. It uses statewide wages, which include rural areas.
Cities with a workforce like Manchester's
Big cities and small ones price differently, so here is Manchester against the 4 metros with the closest total employment.
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Santa Maria, CA | 200,760 jobs | $42,700 – $86,500 | $64,600 | +11% |
| Savannah, GA | 198,360 jobs | $33,100 – $67,100 | $50,100 | −14% |
| Springfield, MA | 201,240 jobs | $44,200 – $89,300 | $66,800 | +15% |
| Modesto, CA | 195,230 jobs | $43,500 – $87,900 | $65,700 | +13% |
Cost by quality level and size in Manchester
Three bands are cut from the same cited range and localized for Manchester 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
$38,400 to $54,200
Bump-out or simple room without plumbing
Standard
$50,200 to $66,000
Standard room addition with HVAC and electrical
Premium
$62,000 to $77,800
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 – $23,100 | $21,700 – $27,300 |
| 20x20 room (400 sq ft) | $51,000 – $71,800 | $66,600 – $87,400 | $82,200 – $103,000 |
| large suite (600 sq ft) | $76,200 – $107,000 | $99,400 – $130,500 | $122,500 – $153,500 |
Specs and site conditions that change a Manchester 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).
Climate in Manchester: timing your home addition job
We use NOAA's 1991-2020 climate normals for Manchester Ap (5 miles from the city center). These are 30-year monthly averages, not forecasts.
April through November is the stretch where digging, grading and setting material in the ground runs into the fewest weather problems in Manchester (8 of 12 months). January, February, March and December have an average overnight low at or below freezing (32°F).
In January, February, March 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 129 days a year with a low at or below 32°F at this station.
Manchester gets about 40 inches of precipitation in a normal year. The wettest months are June, September and October (4.0 inches in June). Inside the workable window, April and July are the driest, at 3.3 and 3.3 inches. The station averages about 16 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 | 34 | 17 | 2.4 | Cold |
| Feb | 37 | 19 | 2.7 | Cold |
| Mar | 46 | 27 | 3.5 | Cold |
| Apr | 59 | 38 | 3.3 | Workable |
| May | 70 | 48 | 3.4 | Workable |
| Jun | 79 | 58 | 4.0 | Workable |
| Jul | 84 | 64 | 3.3 | Workable |
| Aug | 82 | 62 | 3.4 | Workable |
| Sep | 75 | 54 | 3.7 | Workable |
| Oct | 62 | 42 | 3.9 | Workable |
| Nov | 50 | 33 | 3.5 | Workable |
| Dec | 39 | 24 | 3.3 | 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 $50,200 to $66,000 for Manchester, NH is attached.
A detailed PDF report of this estimate, $9
The report lays out the home addition numbers for Manchester, NH line by line, with the local wage and price inputs, permit and timing notes, a quote comparison sheet and the full method. Save your estimate above, preview page 1 free, and unlock the full report for $9 one-time, or get every report with CostLocal Pro.
Home addition in Manchester: your questions
+How much does it cost to build a home addition in Manchester?
For 300 sq ft, expect $38,400 to $77,800 in the Manchester area. A standard-spec job lands at $50,200 to $66,000. Small jobs usually cost more per sq ft and large ones less.
+What is the price per sq ft for home addition in Manchester?
About $126 to $252 per sq ft for materials and labor, plus $530 to $2,100 for the permit if one is needed. The US range is $125 to $250.
+Is home addition cheaper in Manchester or Worcester?
Worcester is 45 miles away. The midpoint for 300 sq ft there is $68,100, which is 17% more than Manchester ($58,100). Wage and materials indexes both feed that gap.
+How much of the bill is labor in Manchester?
About 67% at the midpoint, or $39,200 out of $58,100. Materials are 30% and permits 2%. Nationally, labor is 67%.
+What would 20x20 room (400 sq ft) cost in Manchester?
$51,000 to $103,000. Pick a different size in the estimator above to get your own number.
+Does home addition need a permit in Manchester?
Often, but rules are set by your city or county building office, so call before you hire. Budget $530 to $2,100 for fees in the Manchester area (our national range of $500 to $2,000 scaled by the local price level).
+Is Manchester expensive for home addition compared with the rest of New Hampshire?
Manchester is 0% above the New Hampshire statewide estimate ($58,000 at the midpoint).
+What do carpenters earn in Manchester?
The BLS median is $29.47 an hour in the Manchester area, compared with $29.12 nationally. The 25th to 75th percentile range is $23.91 to $35.02.
+What do basic and premium home addition work cost in Manchester?
For 300 sq ft, basic work runs $38,400 to $54,200 and premium work $62,000 to $77,800. 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 Manchester?
Based on NOAA 1991-2020 normals, the comfortable months for this kind of work are April through November. April and July 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 Manchester
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.