Deck Building Cost in San Francisco, CA
A 16×20 ft deck in San Francisco costs $10,900 (pressure-treated) to $23,300 (composite) — 55% above the national average.
San Francisco — PT Wood Deck (16×20)
$10,900
$34/sqft installed
Composite (Trex)
$23,300
$73/sqft; low-maintenance
vs National Average
55% above
San Francisco labor market
Deck Cost in San Francisco by Material — 2026 (16×20 ft, 320 sqft)
| Material | Total Cost | Per Sqft | Lifespan |
|---|---|---|---|
| Pressure-treated wood | $10,900 | $34/sqft | 15–20 yrs |
| Cedar / Redwood | $16,300 | $51/sqft | 20–30 yrs |
| Composite (Trex, Fiberon) | $23,300 | $73/sqft | 25–30 yrs |
| PVC / capped composite | $26,400 | $83/sqft | 30–50 yrs |
Includes framing, decking, 1 set of stairs, basic railing, and permit. Second story or rooftop decks add 25–50%. San Francisco labor rates are 55% above the national average.
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Deck builder quotes vary $2,000–$5,000 in San Francisco for the same project. Get 3 bids from licensed contractors.
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FAQs — Deck Cost in San Francisco
How much does a deck cost in San Francisco?
A standard 16×20 ft deck (320 sqft) in San Francisco, CA costs $10,900 for pressure-treated wood, $16,300 for cedar, and $23,300 for composite (Trex) — 55% above the national average of $8,500. Per-sqft rates: PT wood $34/sqft, composite $73/sqft. Costs include framing, decking boards, stairs, and basic railings.
Is composite or wood decking better in San Francisco?
In San Francisco's moderate climate, pressure-treated wood ($10,900) is cost-effective if you're willing to seal it every 2–3 years. Composite ($23,300) is the no-maintenance premium choice. Break-even on composite vs. PT wood maintenance savings is typically 10–12 years.
Do I need a permit to build a deck in San Francisco?
Yes — most deck projects in San Francisco require a building permit if the deck is attached to the house, over 30 inches off the ground, or over 200 sqft. Permits cost $225–$625 in San Francisco and require structural drawings and a post-installation inspection. A licensed CA 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 San Francisco?
A 12×12 ft deck (144 sqft) in San Francisco, CA costs: PT wood $6000–$7100, cedar $9000–$10600, composite $12800–$15100. 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 San Francisco?
A wood deck in San Francisco recoups approximately 65–75% of cost at resale according to Remodeling Magazine's Cost vs. Value report. A $10,900 PT wood deck adds $7600–$8200 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 San Francisco's market, outdoor living spaces are increasingly valued — a well-built deck is one of the top outdoor ROI projects.