Home addition cost in Birmingham, AL
Local estimate from BLS wage data and BEA price levels. Reviewed Nov 4, 2026.
- Typical range (300 sq ft)
- $33,700 – $68,200
- Per sq ft
- $111 – $221
- before permit
- Versus US midpoint
- −11%
- US $57,500
- Rank of 300 metros
- #213
- 1 = most expensive
Local price for a home addition in the Birmingham area: $33,700 to $68,200 for 300 sq ft. The low end is a basic job on easy ground; the high end is a premium spec with harder access. The midpoint runs 11% lower than the US figure. Carpenters earn a median of $24.23 an hour in the Birmingham area, 17% below the US median of $29.12.
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Estimated cost for 300 sq ft in Birmingham, AL, standard level
$44,000 to $57,800
About $144 to $188 per sq ft before permits. Labor is about 64% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $15,000 | $19,700 |
| Labor | $28,100 | $36,800 |
| Permits and fees | $870 | $1,400 |
| Total | $44,000 | $57,800 |
Cost breakdown for 300 sq ft in Birmingham, AL
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $11,600 | $17,400 | $23,100 | 34% |
| Labor | $21,600 | $32,400 | $43,300 | 64% |
| Permits and fees | $460 | $1,150 | $1,850 | 2% |
| Total | $33,700 | $50,900 | $68,200 | 100% |
Why Birmingham prices look the way they do
Labor is 64% 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 Birmingham the blended ratio comes out at 0.85.
Materials are scaled with BEA's regional price parity for goods. Birmingham is at 96.4 against 100 for the US, so a materials line of $18,000 nationally becomes $17,400 here (midpoint, 300 sq ft). Permits follow the all-items index of 91.6: $460 to $1,850.
Specs and site conditions that change a Birmingham 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).
The best months for home addition in Birmingham
Climate numbers on this page come from NOAA's 1991-2020 U.S. Climate Normals at the nearest suitable station, Birmingham Ap (5 miles from the city center). They are 30-year averages, so any one year can run hotter, colder or wetter.
For digging, grading and setting material in the ground, the comfortable months in Birmingham are September through June: 10 of 12. Outside them, July and August have an average daytime high of 90°F or more.
Birmingham gets about 57 inches of precipitation in a normal year, including roughly 1 inches of snow. The wettest months are March, April and July (5.7 inches in March). Inside the workable window, September and October are the driest, at 4.0 and 3.3 inches. The station averages about 65 days a year at 90°F or above.
We do not adjust the estimate by month, because we have no reliable published data on seasonal pricing. It is still worth asking contractors whether an off-peak start date changes their bid.
| Month | Avg high °F | Avg low °F | Precip (in) | For this job |
|---|---|---|---|---|
| Jan | 55 | 35 | 5.0 | Workable |
| Feb | 59 | 38 | 5.0 | Workable |
| Mar | 67 | 45 | 5.7 | Workable |
| Apr | 75 | 52 | 5.1 | Workable |
| May | 82 | 61 | 4.9 | Workable |
| Jun | 88 | 69 | 4.8 | Workable |
| Jul | 91 | 72 | 5.4 | Hot |
| Aug | 91 | 71 | 4.3 | Hot |
| Sep | 86 | 65 | 4.0 | Workable |
| Oct | 76 | 54 | 3.3 | Workable |
| Nov | 65 | 43 | 4.2 | Workable |
| Dec | 57 | 38 | 4.9 | Workable |
Planning more than one job in Birmingham?
Jobs that often go together with home addition are priced below at their usual sizes, using the same Birmingham wage and price inputs. Compared with national midpoints, kitchen remodel comes out highest (−6%) and roof replacement lowest (−12%); the gap comes from the trades each job uses.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Kitchen remodel | 120 sq ft | $17,400 – $29,600 | −6% |
| Bathroom remodel | 45 sq ft | $4,300 – $21,200 | −9% |
| Detached garage | 576 sq ft | $26,000 – $52,200 | −10% |
| Roof replacement | 2,000 sq ft of roof | $5,300 – $11,100 | −12% |
Who does the work: Birmingham trade wages
The labor line is built from BLS wage data, one trade at a time. This job draws on 6 trades. We compare each trade's local median with the US median, weight the ratios by how much of the job each trade does, and apply the blend to the national labor cost. For Birmingham the blend is 0.85.
Carpenters (47-2031), 50% of the weighting: a median of $24.23 an hour, 17% below the US median of $29.12. The middle half of them earn between $22.00 and $28.95 an hour. About 1,660 work in the metro. That is 31.9 per 10,000 jobs, compared with 43.1 nationally, so expect fewer local crews to bid.
Cement masons and concrete finishers (47-2051), 10% of the weighting: a median of $22.30 an hour, 19% below the US median of $27.41. The middle half of them earn between $18.48 and $27.61 an hour. About 440 work in the metro. That is 8.5 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 $27.23 an hour, which is 10% below the national $30.38. The middle half of them earn between $22.84 and $30.69 an hour. BLS counts 2,780 of them working in the area, 53.4 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 $28.89 an hour, 6% below the US median of $30.67. The middle half of them earn between $23.67 and $30.98 an hour. About 1,840 work in the metro. That is 35.4 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 $23.44 an hour, which is 17% below the national $28.33. The middle half of them earn between $22.20 and $24.75 an hour. BLS counts 270 of them working in the area, 5.2 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 $22.41 an hour, 16% below the US median of $26.65. The middle half of them earn between $20.90 and $27.09 an hour. About 260 work in the metro. That is 5.0 per 10,000 jobs, compared with 8.7 nationally, so expect fewer local crews to bid.
A quick sensitivity check: moving the lead trade (carpenters) from the median to the 75th percentile wage adds about $3,100 to the midpoint estimate; the 25th percentile takes off about $1,450. That is a swing of roughly 2.9% to 6.1% of the total, which is useful for judging whether a bid reflects wages or something else, such as scope or margin.
Birmingham has 520,290 jobs in total (BLS, May 2025), ranking 50th by size among the 300 metros on this site.
| Trade | Weight | 25th pct | Median | 75th pct | US median | Ratio | Level used |
|---|---|---|---|---|---|---|---|
| Carpenters (47-2031) | 50% | $22.00 | $24.23 | $28.95 | $29.12 | 0.83 | metro |
| Cement masons and concrete finishers (47-2051) | 10% | $18.48 | $22.30 | $27.61 | $27.41 | 0.81 | metro |
| Electricians (47-2111) | 10% | $22.84 | $27.23 | $30.69 | $30.38 | 0.90 | metro |
| Plumbers, pipefitters and steamfitters (47-2152) | 10% | $23.67 | $28.89 | $30.98 | $30.67 | 0.94 | metro |
| Drywall and ceiling tile installers (47-2081) | 10% | $22.20 | $23.44 | $24.75 | $28.33 | 0.83 | metro |
| Roofers (47-2181) | 10% | $20.90 | $22.41 | $27.09 | $26.65 | 0.84 | metro |
| Blended | 100% | 0.85 | |||||
Cost by quality level and size in Birmingham
The cited range is split into basic, standard and premium bands, then scaled to Birmingham. Bands overlap, because plenty of standard jobs cost as much as a light premium one. Sizes run from bump-out (100 sq ft) to large suite (600 sq ft).
Basic
$33,700 to $47,500
Bump-out or simple room without plumbing
Standard
$44,000 to $57,800
Standard room addition with HVAC and electrical
Premium
$54,400 to $68,200
Large addition with bath or kitchen and a new foundation
| Size | Basic | Standard | Premium |
|---|---|---|---|
| bump-out (100 sq ft) | $11,500 – $16,500 | $15,300 – $20,200 | $19,000 – $24,000 |
| 20x20 room (400 sq ft) | $44,700 – $63,000 | $58,400 – $76,700 | $72,100 – $90,300 |
| large suite (600 sq ft) | $66,800 – $93,900 | $87,200 – $114,500 | $107,500 – $134,500 |
Birmingham against nearby metros and the rest of Alabama
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 $49,100 to $51,400 across Birmingham and its five closest metros.
| Area | Range | Midpoint | vs. here |
|---|---|---|---|
| Birmingham, ALthis page | $33,700 – $68,200 | $50,900 | |
| Tuscaloosa, AL60 miles | $33,100 – $67,100 | $50,100 | −2% |
| Decatur, AL75 miles | $34,000 – $68,800 | $51,400 | +1% |
| Montgomery, AL80 miles | $32,500 – $65,800 | $49,200 | −3% |
| Huntsville, AL90 miles | $33,200 – $67,300 | $50,200 | −1% |
| Auburn, AL100 miles | $32,400 – $65,800 | $49,100 | −4% |
| Alabama (statewide) | $32,900 – $66,800 | $49,800 | −2% |
| United States | $38,000 – $77,000 | $57,500 | +13% |
Out of the 300 metros we cover, Birmingham ranks #213 for the cost of this job (#1 is the most expensive). Statewide, Birmingham is 2% above the Alabama figure.
Elsewhere in Alabama
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Huntsville, AL | 266,650 jobs | $33,200 – $67,300 | $50,200 | −1% |
| Mobile, AL | 172,550 jobs | $33,300 – $67,500 | $50,400 | −1% |
| Montgomery, AL | 165,550 jobs | $32,500 – $65,800 | $49,200 | −3% |
| Tuscaloosa, AL | 108,460 jobs | $33,100 – $67,100 | $50,100 | −2% |
| Daphne, AL | 87,120 jobs | $32,400 – $65,800 | $49,100 | −4% |
| Auburn, AL | 72,710 jobs | $32,400 – $65,800 | $49,100 | −4% |
Metros of a similar size
Big cities and small ones price differently, so here is Birmingham against the 4 metros with the closest total employment.
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Buffalo, NY | 534,550 jobs | $40,200 – $81,300 | $60,700 | +19% |
| Omaha, NE | 498,100 jobs | $34,700 – $70,400 | $52,600 | +3% |
| Grand Rapids, MI | 598,260 jobs | $37,400 – $75,700 | $56,500 | +11% |
| Rochester, NY | 494,280 jobs | $39,200 – $79,400 | $59,300 | +16% |
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Home addition in Birmingham: your questions
+How much does it cost to build a home addition in Birmingham?
For 300 sq ft, expect $33,700 to $68,200 in the Birmingham area. A standard-spec job lands at $44,000 to $57,800. Small jobs usually cost more per sq ft and large ones less.
+What is the price per sq ft for home addition in Birmingham?
About $111 to $221 per sq ft for materials and labor, plus $460 to $1,850 for the permit if one is needed. The US range is $125 to $250.
+Is home addition cheaper in Birmingham or Tuscaloosa?
Tuscaloosa is 60 miles away. The midpoint for 300 sq ft there is $50,100, which is 2% less than Birmingham ($50,900). Wage and materials indexes both feed that gap.
+How much of the bill is labor in Birmingham?
About 64% at the midpoint, or $32,400 out of $50,900. Materials are 34% and permits 2%. Nationally, labor is 67%.
+What would 20x20 room (400 sq ft) cost in Birmingham?
$44,700 to $90,300. Pick a different size in the estimator above to get your own number.
+Does home addition need a permit in Birmingham?
Often, but rules are set by your city or county building office, so call before you hire. Budget $460 to $1,850 for fees in the Birmingham area (our national range of $500 to $2,000 scaled by the local price level).
+Is Birmingham expensive for home addition compared with the rest of Alabama?
Birmingham is 2% above the Alabama statewide estimate ($49,800 at the midpoint). We cover 9 metros in Alabama; see the state page to compare them.
+What do carpenters earn in Birmingham?
The BLS median is $24.23 an hour in the Birmingham area, compared with $29.12 nationally. The 25th to 75th percentile range is $22.00 to $28.95.
+What do basic and premium home addition work cost in Birmingham?
For 300 sq ft, basic work runs $33,700 to $47,500 and premium work $54,400 to $68,200. 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 Birmingham?
Based on NOAA 1991-2020 normals, the comfortable months for this kind of work are September through June. September 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 Birmingham
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.