Deck Building Cost in Birmingham, AL (2026)
Updated October 2026 · Birmingham, AL · index 0.90
How much does it cost to build a deck in Birmingham? For a 300 sq ft deck with pressure-treated wood, homeowners in Birmingham, AL pay about $10,100 on average, and most quotes land between $7,000 and $13,200 — $23 to $44 per sq ft. The price covers plans and the permit, footings, a framed and flashed structure, the deck boards, railing, one set of stairs, fascia and cleanup.
The deck building price in Birmingham runs 10% below the U.S. average: construction labor in the Birmingham area runs 15% below the national mean, materials 3% below. The same job averages $11,300 nationally and about $9,800 at the Alabama statewide index.
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Deck building price in Birmingham by decking material
What a 300 sq ft deck costs in Birmingham with each decking material, installed:
| Option | Average · range |
|---|---|
| Pressure-treated woodtreated pine or fir boards, stained and sealed$34 per sq ft | $10,100$7,000 – $13,200 |
| Capped compositehidden fasteners and a picture-frame border$41 per sq ft | $12,200$8,650 – $15,700 |
The least expensive option in Birmingham is pressure-treated wood, at about $10,100; capped composite averages $12,200, 1.2 times as much.
Cost to build a deck in Birmingham by size
With pressure-treated wood, priced for Birmingham, AL:
| Size | Average · range |
|---|---|
| A 200 sq ft deck$36 per sq ft | $7,300$5,000 – $9,600 |
| A 300 sq ft deck$34 per sq ft | $10,100$7,000 – $13,200 |
| A 400 sq ft deck$32 per sq ft | $13,000$9,050 – $16,900 |
Some costs stay the same whatever the size — plans, permit and layout, one set of stairs (4 steps), final inspection and cleanup — so a bigger job costs less per unit: $32 per sq ft for a 400 sq ft deck against $36 for a 200 sq ft deck.
What a deck building in Birmingham includes
Line by line, the $10,100 average for a 300 sq ft deck breaks down like this: 47% labor, 53% materials and equipment.
| Line | Low – high |
|---|---|
| Plans, permit and layout | $330 – $990 |
| Ground prep, fabric and gravel | $200 – $500 |
| Footings below the frost line | $370 – $740 |
| Flashed ledger on the house | $220 – $430 |
| 6x6 posts | $250 – $500 |
| Beams | $220 – $430 |
| Joist framing with hangers | $1,300 – $2,200 |
| Deck boards | $1,200 – $1,800 |
| One set of stairs (4 steps) | $460 – $930 |
| Railing | $1,700 – $2,950 |
| Fascia and skirting | $320 – $770 |
| Final inspection and cleanup | $130 – $330 |
| Stain and seal, two coats | $300 – $700 |
Each line is the price book's U.S. rate for that step, scaled by 0.74 to the installed price published sources give for the whole job (see how these prices are built), times Birmingham's index of 0.90; permit fees are not scaled.
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What affects deck building prices in Birmingham
Labor and materials in Birmingham
Construction wages in the Birmingham metro run 16% below the U.S. mean (BLS, May 2025), and specialty-contractor pay in the city's county moves that up by 2%, to 15% below the national mean. Materials in the area's ZIP codes price 3% below the national average. Together they give Birmingham a construction cost index of 0.90.
Where Birmingham sits in Alabama
Birmingham is the most expensive of the 4 Alabama cities in our index, against a statewide index of 0.87. Montgomery is the least expensive at 0.86.
Against the rest of the country
Of the 306 U.S. cities in JobFlex's index, Birmingham ranks 269th from the most expensive. The job that averages $10,100 here averages $11,300 at the national rate.
Frost depth in Alabama
Deck footings go below the frost line, or they heave by the second spring. The typical code frost depth in Alabama is about 5 in.. Your building department sets the exact figure.
The deck code in Alabama
There is no statewide code; decks follow the International Residential Code as the cities and counties of Alabama adopt it (Mobile County: 2024 IRC since July 2026; Birmingham: 2021 IRC; the state-level code on record is the 2015 IRC with Alabama changes). Guards are required at 36 in. where the deck is more than 30 in. up, and stair risers can be up to 7.75 in.
What decks are built of in Alabama
Most used on decks in Alabama, Kentucky, Mississippi and Tennessee: treated pine, then capped composite, then cedar.
Sales tax in Alabama
Alabama's base state sales tax is 4%, and cities and counties can add their own. How it applies to a home-improvement contract varies, so ask whether a quote includes it. Prices on this page are before tax.
What a Birmingham contractor will ask before quoting
- Reuse the frame or rebuild?
- Height, railing style and stairs
- Board brand and color
Deck building cost in other Alabama cities
A 300 sq ft deck with pressure-treated wood averages $10,100 in Birmingham; $10,000 in Huntsville, $9,900 in Mobile, $9,650 in Montgomery.
| City | Average · range |
|---|---|
| Huntsville, AL1% less | $10,000$6,900 – $13,100 |
| Mobile, AL2% less | $9,900$6,850 – $13,000 |
| Montgomery, AL4% less | $9,650$6,700 – $12,700 |
deck building price in Birmingham: questions
How much does it cost to build a deck in Birmingham, AL?
About $10,100 for a 300 sq ft deck with pressure-treated wood, and most Birmingham quotes fall between $7,000 and $13,200. That is 10% below the U.S. average, where the same job averages $11,300.
What is the deck price per square foot in Birmingham?
$23 to $44 per sq ft, about $34 on average with pressure-treated wood. Smaller jobs cost more per unit, because the fixed costs are spread over less.
How much is a 400 sq ft deck in Birmingham?
$9,050 to $16,900, about $13,000 on average, with pressure-treated wood — $32 per sq ft.
Do you need a permit for deck building in Birmingham?
Yes — a new deck needs a permit nearly everywhere, Birmingham included. In Alabama, decks follow the International Residential Code as the cities and counties of Alabama adopt it (Mobile County: 2024 IRC since July 2026; Birmingham: 2021 IRC; the state-level code on record is the 2015 IRC with Alabama changes). The prices on this page carry $330–$990 for plans, permit and layout.
Does the price include sales tax in Alabama?
No. The prices here are before tax; Alabama's base state rate is 4%, plus any local rate.
What decking do people choose in Alabama?
Most used on decks in Alabama, Kentucky, Mississippi and Tennessee: treated pine, then capped composite, then cedar.
Other home projects in Birmingham
Deck building cost in Alabama
How these prices are built
Every price on this page comes from JobFlex's contractor price book: what a homeowner pays a licensed contractor for each step of the job, as a U.S. national average per unit, with the contractor's overhead and profit included and sales tax left out. The deck building is priced step by step, then multiplied by Birmingham's construction cost index of 0.90.
Where the price book's steps for an option add up to more than 20% over the installed price a published source gives for the whole job, every step but a permit fee is scaled down to the middle of that range: pressure-treated wood × 0.74 (HomeGuide 2026: $25–$50 per sq ft); capped composite × 0.80 (Ergeon 2026: $30–$60 per sq ft).
The index weighs local construction wages (BLS Occupational Employment and Wage Statistics, May 2025) at 60% and the area's material prices (Craftsman ZIP-area factors) at 40%. Published indices for Birmingham, each on its own base: RSMeans residential 0.89, HUD 0.88, Craftsman 1.06. Treat any city figure as about ±5%; a contractor's quote for your house is the number to plan with.
Contractors in Birmingham build quotes like these with JobFlex's Deck Studio.
- HomeGuide 2026: pressure-treated deck $25-$50/sqft installed, labor $15-$30/sqft
- Ergeon 2026: composite deck $30-$60/sqft installed
- HomeGuide 2026: composite railing $25-$60/lf, aluminum $50-$200/lf installed