Home addition cost in Alabama
Statewide estimate from BLS wages and BEA prices. Reviewed Nov 4, 2026.
- Statewide range (300 sq ft)
- $32,900 – $66,800
- Per sq ft
- $108 – $217
- before permit
- Versus US midpoint
- −13%
- US $57,500
- Metros covered
- 9
What does it cost to build a home addition in Alabama? Plan on $32,900 to $66,800 for 300 sq ft. Wages (0.82x the US blend), materials (price index 96.4) and permit costs (88.8) put the state below the national midpoint by 13%.
Inside Alabama, the metros we cover range from $46,900 (Dothan) to $51,400 (Decatur) 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 Alabama (statewide), standard level
$43,100 to $56,600
About $141 to $184 per sq ft before permits. Labor is about 63% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $15,000 | $19,700 |
| Labor | $27,200 | $35,600 |
| Permits and fees | $840 | $1,400 |
| Total | $43,100 | $56,600 |
Cost breakdown for 300 sq ft in Alabama
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $11,600 | $17,400 | $23,100 | 35% |
| Labor | $20,900 | $31,400 | $41,800 | 63% |
| Permits and fees | $440 | $1,100 | $1,800 | 2% |
| Total | $32,900 | $49,800 | $66,800 | 100% |
Related projects, priced for Alabama
The table prices neighboring jobs at their usual sizes using statewide Alabama wages and prices. Against national midpoints, kitchen remodel comes out highest (−6%) and roof replacement lowest (−13%), because each job leans on different trades.
| Project | Size | Range | vs. US |
|---|---|---|---|
| Kitchen remodel | 120 sq ft | $17,300 – $29,400 | −6% |
| Bathroom remodel | 45 sq ft | $4,250 – $21,000 | −10% |
| Detached garage | 576 sq ft | $25,600 – $51,300 | −12% |
| Roof replacement | 2,000 sq ft of roof | $5,250 – $11,000 | −13% |
Alabama against its neighbors
Alabama ranks 48 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. Alabama sits at $49,800. The five states closest by workforce center are listed below.
| State | Distance | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Georgia | 170 miles away | $34,100 – $69,200 | $51,700 | +4% |
| Mississippi | 180 miles away | $32,500 – $66,000 | $49,300 | −1% |
| Tennessee | 190 miles away | $33,800 – $68,600 | $51,200 | +3% |
| Louisiana | 310 miles away | $33,700 – $68,300 | $51,000 | +2% |
| South Carolina | 350 miles away | $33,500 – $67,900 | $50,700 | +2% |
When Alabama weather lets you build
Season matters for home addition. For each Alabama metro below we took NOAA's 1991-2020 monthly normals from the nearest suitable station and counted comfortable months for digging and ground work.
Daphne has the longest comfortable season of the metros we cover in Alabama at 12 months; Dothan has the shortest at 9 (September through May). Rainfall runs from 49 inches a year in Decatur to 66 inches in Daphne.
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 |
|---|---|---|---|---|
| Birmingham | 35 | 91 | 57 | 10: September through June |
| Huntsville | 33 | 92 | 54 | 10: September through June |
| Mobile | 43 | 92 | 61 | 9: September through May |
| Montgomery | 37 | 94 | 51 | 9: September through May |
| Tuscaloosa | 35 | 92 | 57 | 9: September through May |
| Daphne | 39 | 89 | 66 | 12: all year |
| Auburn | 35 | 89 | 56 | 12: all year |
| Decatur | 32 | 90 | 49 | 9: February through June and September through December |
| Dothan | 40 | 93 | 54 | 9: September through May |
Home addition: what moves the price in Alabama
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.
Quality levels and sizes in Alabama
The cited range is cut into three overlapping bands (basic, standard and premium) and scaled to statewide Alabama wages and prices. The grid prices the same bands at 3 common sizes.
Basic
$32,900 to $46,500
Bump-out or simple room without plumbing
Standard
$43,100 to $56,600
Standard room addition with HVAC and electrical
Premium
$53,200 to $66,800
Large addition with bath or kitchen and a new foundation
| Size | Basic | Standard | Premium |
|---|---|---|---|
| bump-out (100 sq ft) | $11,300 – $16,100 | $14,900 – $19,800 | $18,600 – $23,400 |
| 20x20 room (400 sq ft) | $43,800 – $61,600 | $57,200 – $75,000 | $70,600 – $88,400 |
| large suite (600 sq ft) | $65,400 – $91,900 | $85,300 – $112,000 | $105,000 – $131,500 |
Which Alabama city is cheapest for home addition?
5 of the 9 metros sit above the statewide midpoint of $49,800, and the top-to-bottom gap is 9%. 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 |
|---|---|---|---|
| Decatur, AL | $34,000 – $68,800 | $51,400 | +3% |
| Birmingham, AL | $33,700 – $68,200 | $50,900 | +2% |
| Mobile, AL | $33,300 – $67,500 | $50,400 | +1% |
| Huntsville, AL | $33,200 – $67,300 | $50,200 | +1% |
| Tuscaloosa, AL | $33,100 – $67,100 | $50,100 | +1% |
| Montgomery, AL | $32,500 – $65,800 | $49,200 | −1% |
| Daphne, AL | $32,400 – $65,800 | $49,100 | −1% |
| Auburn, AL | $32,400 – $65,800 | $49,100 | −1% |
| Dothan, AL | $31,000 – $62,900 | $46,900 | −6% |
What carpenters and the other trades earn in Alabama
Statewide wages come from BLS's state-level estimates, which blend big cities with small towns and rural areas. 6 trades drive the labor line for this job, and the weighted ratio against the national wage level is 0.82 for Alabama.
For carpenters (47-2031, weighted 50%) the local median is $23.18 an hour, which is 20% below the national $29.12. The middle half of them earn between $19.43 and $27.11 an hour. BLS counts 5,560 of them working in the state, 26.3 for every 10,000 jobs (US: 43.1), so the local bench is thinner than average.
For cement masons and concrete finishers (47-2051, weighted 10%) the local median is $21.50 an hour, which is 22% below the national $27.41. The middle half of them earn between $17.96 and $26.36 an hour. BLS counts 2,110 of them working in the state, 10.0 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 $26.78 an hour, 12% below the US median of $30.38. The middle half of them earn between $22.17 and $30.98 an hour. About 10,900 work in the state. That is 51.6 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 $28.21 an hour, which is 8% below the national $30.67. The middle half of them earn between $22.63 and $31.12 an hour. BLS counts 6,950 of them working in the state, 32.9 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 $23.08 an hour, 19% below the US median of $28.33. The middle half of them earn between $20.04 and $24.75 an hour. About 650 work in the state. That is 3.1 per 10,000 jobs, compared with 5.3 nationally, so expect fewer local crews to bid.
For roofers (47-2181, weighted 10%) the local median is $21.96 an hour, which is 18% below the national $26.65. The middle half of them earn between $20.36 and $25.64 an hour. BLS counts 1,010 of them working in the state, 4.8 for every 10,000 jobs (US: 8.7), so the local bench is thinner than average.
A crew paid at the 75th percentile for carpenters ($27.11 an hour) would add about $2,600 to the statewide midpoint; one at the 25th percentile ($19.43) would take off about $2,450. Use that as a rough guide to how far a bid can sit from our midpoint on wages alone.
BLS counts 2,113,660 jobs across Alabama (May 2025), which is 1.4% of US employment.
| Trade | Weight | 25th pct | Median | 75th pct | US median | Ratio | Level used |
|---|---|---|---|---|---|---|---|
| Carpenters (47-2031) | 50% | $19.43 | $23.18 | $27.11 | $29.12 | 0.80 | state |
| Cement masons and concrete finishers (47-2051) | 10% | $17.96 | $21.50 | $26.36 | $27.41 | 0.78 | state |
| Electricians (47-2111) | 10% | $22.17 | $26.78 | $30.98 | $30.38 | 0.88 | state |
| Plumbers, pipefitters and steamfitters (47-2152) | 10% | $22.63 | $28.21 | $31.12 | $30.67 | 0.92 | state |
| Drywall and ceiling tile installers (47-2081) | 10% | $20.04 | $23.08 | $24.75 | $28.33 | 0.81 | state |
| Roofers (47-2181) | 10% | $20.36 | $21.96 | $25.64 | $26.65 | 0.82 | state |
| Blended | 100% | 0.82 | |||||
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Home addition in Alabama: your questions
+How much does it cost to build a home addition in Alabama?
$32,900 to $66,800 for 300 sq ft, using statewide wages and prices. Metro areas inside Alabama can sit above or below that.
+Which city in Alabama is cheapest for home addition?
Dothan at about $46,900 (midpoint, 300 sq ft). The priciest is Decatur at $51,400.
+Is home addition cheaper in Alabama than the US average?
It is 13% cheaper: $49,800 against $57,500 for 300 sq ft at the midpoint.
+What share of the price is labor in Alabama?
About 63% ($31,400). Materials are 35%. Statewide labor for this job is weighted 0.82x the national wage level.
+What do carpenters earn in Alabama?
The BLS statewide median is $23.18 an hour, against $29.12 for the US. The 25th to 75th percentile range is $19.43 to $27.11.
+Where does Alabama rank for home addition costs?
48th most expensive of 51 (the 50 states plus DC) at the midpoint, $49,800 for 300 sq ft. Rank 1 is the costliest.
+What do basic and premium home addition work cost in Alabama?
For 300 sq ft, basic work runs $32,900 to $46,500 and premium work $53,200 to $66,800. 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 Alabama?
Yes where winters or summers are hard. Of the Alabama metros we cover, Daphne has the most comfortable months (12 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 Alabama
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.