Deck Building Cost in Phoenix, AZ (2026)
Updated October 2026 · Phoenix, AZ · index 0.97
How much does it cost to build a deck in Phoenix? For a 300 sq ft deck with pressure-treated wood, homeowners in Phoenix, AZ pay about $10,900 on average, and most quotes land between $7,550 and $14,300 — $25 to $48 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 Phoenix runs 3% below the U.S. average: construction labor in the Phoenix area runs 6% below the national mean, materials 1% above. The same job averages $11,300 nationally and about $10,800 at the Arizona statewide index.
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Deck building price in Phoenix by decking material
What a 300 sq ft deck costs in Phoenix with each decking material, installed:
| Option | Average · range |
|---|---|
| Pressure-treated woodtreated pine or fir boards, stained and sealed$36 per sq ft | $10,900$7,550 – $14,300 |
| Capped compositehidden fasteners and a picture-frame border$44 per sq ft | $13,100$9,300 – $16,900 |
The least expensive option in Phoenix is pressure-treated wood, at about $10,900; capped composite averages $13,100, 1.2 times as much.
Cost to build a deck in Phoenix by size
With pressure-treated wood, priced for Phoenix, AZ:
| Size | Average · range |
|---|---|
| A 200 sq ft deck$39 per sq ft | $7,850$5,350 – $10,300 |
| A 300 sq ft deck$36 per sq ft | $10,900$7,550 – $14,300 |
| A 400 sq ft deck$35 per sq ft | $14,000$9,750 – $18,200 |
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: $35 per sq ft for a 400 sq ft deck against $39 for a 200 sq ft deck.
What a deck building in Phoenix includes
Line by line, the $10,900 average for a 300 sq ft deck breaks down like this: 47% labor, 53% materials and equipment.
| Line | Low – high |
|---|---|
| Plans, permit and layout | $360 – $1,050 |
| Ground prep, fabric and gravel | $210 – $540 |
| Footings below the frost line | $400 – $800 |
| Flashed ledger on the house | $240 – $470 |
| 6x6 posts | $270 – $540 |
| Beams | $240 – $470 |
| Joist framing with hangers | $1,400 – $2,350 |
| Deck boards | $1,300 – $1,950 |
| One set of stairs (4 steps) | $500 – $1,000 |
| Railing | $1,850 – $3,200 |
| Fascia and skirting | $350 – $830 |
| Final inspection and cleanup | $140 – $360 |
| Stain and seal, two coats | $320 – $750 |
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 Phoenix's index of 0.97; permit fees are not scaled.
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What affects deck building prices in Phoenix
Labor and materials in Phoenix
Construction wages in the Phoenix area run 6% below the U.S. mean (BLS, May 2025), and materials in its ZIP codes price 1% above the national average. Together they give Phoenix a construction cost index of 0.97.
Where Phoenix sits in Arizona
Phoenix ties for the most expensive of the 5 Arizona cities in our index, against a statewide index of 0.96. Tucson is the least expensive at 0.91.
Against the rest of the country
Of the 306 U.S. cities in JobFlex's index, Phoenix ranks 188th from the most expensive. The job that averages $10,900 here averages $11,300 at the national rate.
Frost depth in Arizona
Deck footings go below the frost line, or they heave by the second spring. The typical code frost depth in Arizona is about 6 in.. Your building department sets the exact figure.
The deck code in Arizona
There is no statewide code; decks follow the International Residential Code as the cities and counties of Arizona adopt it (Phoenix: 2024 IRC since August 2025; Pima County: 2024 IRC since 2026; unincorporated Maricopa County: 2018 IRC). 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 Arizona
Most used on decks in the Mountain states: capped composite, then treated hem-fir or fir 2x6, then cedar.
Sales tax in Arizona
Arizona's base state sales tax is 5.6%, and cities and counties can add their own. Arizona also taxes installation labor on real property, so ask whether a quote includes tax on the whole job. Prices on this page are before tax.
What a Phoenix contractor will ask before quoting
- Reuse the frame or rebuild?
- Height, railing style and stairs
- Board brand and color
Deck building cost in other Arizona cities
A 300 sq ft deck with pressure-treated wood averages $10,900 in Phoenix; $10,900 in Scottsdale, $10,900 in Mesa, $10,200 in Tucson.
| City | Average · range |
|---|---|
| Scottsdale, AZsame as Phoenix | $10,900$7,550 – $14,300 |
| Mesa, AZsame as Phoenix | $10,900$7,550 – $14,300 |
| Tucson, AZ6% less | $10,200$7,100 – $13,400 |
| Flagstaff, AZ3% less | $10,600$7,300 – $13,800 |
deck building price in Phoenix: questions
How much does it cost to build a deck in Phoenix, AZ?
About $10,900 for a 300 sq ft deck with pressure-treated wood, and most Phoenix quotes fall between $7,550 and $14,300. That is 3% below the U.S. average, where the same job averages $11,300.
What is the deck price per square foot in Phoenix?
$25 to $48 per sq ft, about $36 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 Phoenix?
$9,750 to $18,200, about $14,000 on average, with pressure-treated wood — $35 per sq ft.
Do you need a permit for deck building in Phoenix?
Yes — a new deck needs a permit nearly everywhere, Phoenix included. In Arizona, decks follow the International Residential Code as the cities and counties of Arizona adopt it (Phoenix: 2024 IRC since August 2025; Pima County: 2024 IRC since 2026; unincorporated Maricopa County: 2018 IRC). The prices on this page carry $360–$1,050 for plans, permit and layout.
Does the price include sales tax in Arizona?
No. The prices here are before tax; Arizona's base state rate is 5.6%, plus any local rate. Arizona taxes installation labor too.
What decking do people choose in Arizona?
Most used on decks in the Mountain states: capped composite, then treated hem-fir or fir 2x6, then cedar.
Other home projects in Phoenix
Deck building cost in Arizona
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 Phoenix's construction cost index of 0.97.
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 Phoenix, each on its own base: RSMeans residential 0.91, HUD 0.92, Craftsman 1.05. Treat any city figure as about ±5%; a contractor's quote for your house is the number to plan with.
Contractors in Phoenix 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