Home addition cost in Mobile, AL
Local estimate from BLS wage data and BEA price levels. Reviewed Nov 4, 2026.
- Typical range (300 sq ft)
- $33,300 – $67,500
- Per sq ft
- $110 – $219
- before permit
- Versus US midpoint
- −12%
- US $57,500
- Rank of 300 metros
- #226
- 1 = most expensive
Local price for a home addition in the Mobile area: $33,300 to $67,500 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 12% lower than the US figure. Carpenters earn a median of $23.34 an hour in the Mobile area, 20% below the US median of $29.12.
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Estimated cost for 300 sq ft in Mobile, AL, standard level
$43,500 to $57,200
About $142 to $186 per sq ft before permits. Labor is about 63% of the bill.
| Part | Low | High |
|---|---|---|
| Materials | $15,000 | $19,700 |
| Labor | $27,700 | $36,200 |
| Permits and fees | $840 | $1,350 |
| Total | $43,500 | $57,200 |
Cost breakdown for 300 sq ft in Mobile, AL
| Part of the job | Low | Midpoint | High | Share |
|---|---|---|---|---|
| Materials | $11,600 | $17,400 | $23,100 | 34% |
| Labor | $21,300 | $31,900 | $42,600 | 63% |
| Permits and fees | $440 | $1,100 | $1,750 | 2% |
| Total | $33,300 | $50,400 | $67,500 | 100% |
Where the Mobile price comes from
The wage side of the estimate leans on carpenters, who do 50% of the hours on a typical job. Their local median is $23.34 an hour. Add the other trades involved and the blended wage index for Mobile is 0.83 (US = 1.00), which puts labor at 63% of the total.
Materials are scaled with BEA's regional price parity for goods. Mobile 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 88.1: $440 to $1,750.
Data note: 10% of the labor weighting for this project uses a statewide median because BLS has no published metro figure for that trade in Mobile. The wage table below marks each row.
Is Mobile cheap or dear? The local comparison
Of the five closest metros, all are cheaper than Mobile. Hattiesburg is the lowest at about $48,000 (midpoint, 300 sq ft), 70 miles away.
| Area | Range | Midpoint | vs. here |
|---|---|---|---|
| Mobile, ALthis page | $33,300 – $67,500 | $50,400 | |
| Daphne, AL25 miles | $32,400 – $65,800 | $49,100 | −2% |
| Gulfport, MS50 miles | $32,800 – $66,600 | $49,700 | −1% |
| Pensacola, FL60 miles | $32,400 – $65,800 | $49,100 | −2% |
| Hattiesburg, MS70 miles | $31,700 – $64,300 | $48,000 | −5% |
| Slidell, LA105 miles | $33,000 – $66,900 | $50,000 | −1% |
| Alabama (statewide) | $32,900 – $66,800 | $49,800 | −1% |
| United States | $38,000 – $77,000 | $57,500 | +14% |
Out of the 300 metros we cover, Mobile ranks #226 for the cost of this job (#1 is the most expensive). Statewide, Mobile is 1% above the Alabama figure.
Elsewhere in Alabama
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Birmingham, AL | 520,290 jobs | $33,700 – $68,200 | $50,900 | +1% |
| Huntsville, AL | 266,650 jobs | $33,200 – $67,300 | $50,200 | level |
| Montgomery, AL | 165,550 jobs | $32,500 – $65,800 | $49,200 | −2% |
| Tuscaloosa, AL | 108,460 jobs | $33,100 – $67,100 | $50,100 | level |
| Daphne, AL | 87,120 jobs | $32,400 – $65,800 | $49,100 | −2% |
| Auburn, AL | 72,710 jobs | $32,400 – $65,800 | $49,100 | −3% |
Metros of a similar size
Big cities and small ones price differently, so here is Mobile against the 4 metros with the closest total employment.
| Metro | Size | Range | Midpoint | vs. here |
|---|---|---|---|---|
| Naples, FL | 173,880 jobs | $34,000 – $69,000 | $51,500 | +2% |
| Visalia, CA | 171,140 jobs | $39,000 – $79,000 | $59,000 | +17% |
| Green Bay, WI | 174,550 jobs | $39,400 – $79,600 | $59,500 | +18% |
| Port St. Lucie, FL | 170,820 jobs | $33,100 – $67,300 | $50,200 | level |
Who does the work: Mobile 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 Mobile the blend is 0.83.
Carpenters (47-2031), 50% of the weighting: a median of $23.34 an hour, 20% below the US median of $29.12. The middle half of them earn between $20.96 and $27.51 an hour. About 630 work in the metro. That is 36.5 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 $21.80 an hour, 20% below the US median of $27.41. The middle half of them earn between $18.09 and $27.10 an hour. About 230 work in the metro. That is 13.3 per 10,000 jobs, compared with 13.3 nationally, so the supply of crews looks typical.
For electricians (47-2111, weighted 10%) the local median is $29.68 an hour, which is in line with the national $30.38. The middle half of them earn between $23.42 and $31.44 an hour. BLS counts 1,360 of them working in the area, 78.8 for every 10,000 jobs (US: 48.7), so the local bench is deeper than average.
Plumbers, pipefitters and steamfitters (47-2152), 10% of the weighting: a median of $28.56 an hour, 7% below the US median of $30.67. The middle half of them earn between $23.41 and $31.62 an hour. About 960 work in the metro. That is 55.6 per 10,000 jobs, compared with 30.0 nationally, which suggests plenty of local crews to bid.
Drywall and ceiling tile installers (47-2081) carry 10% of the labor weighting. BLS does not publish this trade for the Mobile metro, so we used the Alabama statewide median: $23.08 an hour against $28.33 for the US. The middle half of them earn between $20.04 and $24.75 an hour.
Roofers (47-2181), 10% of the weighting: a median of $21.90 an hour, 18% below the US median of $26.65. The middle half of them earn between $18.90 and $22.23 an hour. About 120 work in the metro. That is 7.0 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 $2,750 to the midpoint estimate; the 25th percentile takes off about $1,550. That is a swing of roughly 3.1% to 5.4% of the total, which is useful for judging whether a bid reflects wages or something else, such as scope or margin.
Mobile has 172,550 jobs in total (BLS, May 2025), ranking 135th 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% | $20.96 | $23.34 | $27.51 | $29.12 | 0.80 | metro |
| Cement masons and concrete finishers (47-2051) | 10% | $18.09 | $21.80 | $27.10 | $27.41 | 0.80 | metro |
| Electricians (47-2111) | 10% | $23.42 | $29.68 | $31.44 | $30.38 | 0.98 | metro |
| Plumbers, pipefitters and steamfitters (47-2152) | 10% | $23.41 | $28.56 | $31.62 | $30.67 | 0.93 | metro |
| Drywall and ceiling tile installers (47-2081) | 10% | $20.04 | $23.08 | $24.75 | $28.33 | 0.81 | state |
| Roofers (47-2181) | 10% | $18.90 | $21.90 | $22.23 | $26.65 | 0.82 | metro |
| Blended | 100% | 0.83 | |||||
Related projects, priced for Mobile
Jobs that often go together with home addition are priced below at their usual sizes, using the same Mobile wage and price inputs. Compared with national midpoints, kitchen remodel comes out highest (−6%) and roof replacement lowest (−13%); 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 | $4,250 – $21,200 | −9% |
| Detached garage | 576 sq ft | $25,800 – $51,700 | −11% |
| Roof replacement | 2,000 sq ft of roof | $5,200 – $11,000 | −13% |
Why two Mobile quotes can differ
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).
Cost by quality level and size in Mobile
The cited range is split into basic, standard and premium bands, then scaled to Mobile. 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
$33,300 to $47,000
Bump-out or simple room without plumbing
Standard
$43,500 to $57,200
Standard room addition with HVAC and electrical
Premium
$53,800 to $67,500
Large addition with bath or kitchen and a new foundation
| Size | Basic | Standard | Premium |
|---|---|---|---|
| bump-out (100 sq ft) | $11,400 – $16,300 | $15,100 – $20,000 | $18,800 – $23,700 |
| 20x20 room (400 sq ft) | $44,200 – $62,300 | $57,800 – $75,800 | $71,300 – $89,400 |
| large suite (600 sq ft) | $66,100 – $93,000 | $86,300 – $113,000 | $106,500 – $133,000 |
The best months for home addition in Mobile
Climate numbers on this page come from NOAA's 1991-2020 U.S. Climate Normals at the nearest suitable station, Mobile Dwtn 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 Mobile are September through May: 9 of 12. Outside them, June, July and August have an average daytime high of 90°F or more.
Mobile gets about 61 inches of precipitation in a normal year. The wettest months are June, July and August (7.1 inches in August). Inside the workable window, February and October are the driest, at 3.8 and 3.8 inches. The station averages about 73 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 | 62 | 43 | 5.2 | Workable |
| Feb | 66 | 46 | 3.8 | Workable |
| Mar | 72 | 52 | 5.1 | Workable |
| Apr | 78 | 59 | 4.9 | Workable |
| May | 85 | 66 | 4.4 | Workable |
| Jun | 90 | 73 | 5.8 | Hot |
| Jul | 92 | 75 | 6.6 | Hot |
| Aug | 92 | 75 | 7.1 | Hot |
| Sep | 89 | 72 | 4.5 | Workable |
| Oct | 81 | 61 | 3.8 | Workable |
| Nov | 72 | 50 | 4.1 | Workable |
| Dec | 64 | 45 | 5.3 | Workable |
Get 3 local quotes
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Home addition in Mobile: your questions
+How much does it cost to build a home addition in Mobile?
For 300 sq ft, expect $33,300 to $67,500 in the Mobile area. A standard-spec job lands at $43,500 to $57,200. Small jobs usually cost more per sq ft and large ones less.
+What is the price per sq ft for home addition in Mobile?
About $110 to $219 per sq ft for materials and labor, plus $440 to $1,750 for the permit if one is needed. The US range is $125 to $250.
+Is home addition cheaper in Mobile or Daphne?
Daphne is 25 miles away. The midpoint for 300 sq ft there is $49,100, which is 2% less than Mobile ($50,400). Wage and materials indexes both feed that gap.
+How much of the bill is labor in Mobile?
About 63% at the midpoint, or $31,900 out of $50,400. Materials are 34% and permits 2%. Nationally, labor is 67%.
+What would 20x20 room (400 sq ft) cost in Mobile?
$44,200 to $89,400. Pick a different size in the estimator above to get your own number.
+Does home addition need a permit in Mobile?
Often, but rules are set by your city or county building office, so call before you hire. Budget $440 to $1,750 for fees in the Mobile area (our national range of $500 to $2,000 scaled by the local price level).
+Is Mobile expensive for home addition compared with the rest of Alabama?
Mobile is 1% 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 Mobile?
The BLS median is $23.34 an hour in the Mobile area, compared with $29.12 nationally. The 25th to 75th percentile range is $20.96 to $27.51.
+What do basic and premium home addition work cost in Mobile?
For 300 sq ft, basic work runs $33,300 to $47,000 and premium work $53,800 to $67,500. 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 Mobile?
Based on NOAA 1991-2020 normals, the comfortable months for this kind of work are September through May. February 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 Mobile
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.