Deck Building Cost in Philadelphia, PA
A 16×20 ft deck in Philadelphia costs $7,900 (pressure-treated) to $17,000 (composite) — 13% above the national average.
Philadelphia — PT Wood Deck (16×20)
$7,900
$25/sqft installed
Composite (Trex)
$17,000
$53/sqft; low-maintenance
vs National Average
13% above
Philadelphia labor market
Deck Cost in Philadelphia by Material — 2026 (16×20 ft, 320 sqft)
| Material | Total Cost | Per Sqft | Lifespan |
|---|---|---|---|
| Pressure-treated wood | $7,900 | $25/sqft | 15–20 yrs |
| Cedar / Redwood | $11,900 | $37/sqft | 20–30 yrs |
| Composite (Trex, Fiberon) | $17,000 | $53/sqft | 25–30 yrs |
| PVC / capped composite | $19,300 | $60/sqft | 30–50 yrs |
Includes framing, decking, 1 set of stairs, basic railing, and permit. Second story or rooftop decks add 25–50%. Philadelphia labor rates are 13% above the national average.
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Deck builder quotes vary $2,000–$5,000 in Philadelphia for the same project. Get 3 bids from licensed contractors.
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FAQs — Deck Cost in Philadelphia
How much does a deck cost in Philadelphia?
A standard 16×20 ft deck (320 sqft) in Philadelphia, PA costs $7,900 for pressure-treated wood, $11,900 for cedar, and $17,000 for composite (Trex) — 13% above the national average of $8,500. Per-sqft rates: PT wood $25/sqft, composite $53/sqft. Costs include framing, decking boards, stairs, and basic railings.
Is composite or wood decking better in Philadelphia?
In Philadelphia's humid climate, composite decking (Trex, Fiberon) is strongly recommended. It won't rot, warp, or grow mildew — major problems for wood in humidity. While composite costs $9,100 more upfront, it requires no annual sealing/staining and lasts 25–30 years with minimal maintenance.
Do I need a permit to build a deck in Philadelphia?
Yes — most deck projects in Philadelphia require a building permit if the deck is attached to the house, over 30 inches off the ground, or over 200 sqft. Permits cost $175–$450 in Philadelphia and require structural drawings and a post-installation inspection. A licensed PA contractor will handle permits as part of the project. Unpermitted decks must be disclosed at sale and may need to be removed or permitted retroactively.
How much does a 12×12 deck cost in Philadelphia?
A 12×12 ft deck (144 sqft) in Philadelphia, PA costs: PT wood $4300–$5100, cedar $6500–$7700, composite $9400–$11100. Smaller decks have higher per-sqft costs since fixed costs (footings, framing, stairs) spread over fewer square feet. A 12×12 is popular for smaller yards and costs approximately 55–65% of a 16×20.
What is the ROI on a deck in Philadelphia?
A wood deck in Philadelphia recoups approximately 65–75% of cost at resale according to Remodeling Magazine's Cost vs. Value report. A $7,900 PT wood deck adds $5500–$5900 to your home's value. Composite decks often recoup a similar dollar amount to wood but at a higher cost, so the percentage ROI is lower. In Philadelphia's market, outdoor living spaces are increasingly valued — a well-built deck is one of the top outdoor ROI projects.