Walnut CreekDeck Builders
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Decks for Walnut Creek, Lafayette, Orinda & Danville homes.

Deck Builders in Walnut Creek, CA

New decks run about $30–$60+ per square foot nationally, and composite decking about $15–$32+ per square foot installed (Angi), with Bay Area projects typically higher. In Walnut Creek, only small, low, detached decks skip the permit.

  • Hillside, multi-level and second-story decks
  • Composite, redwood, cedar and fire-rated decking
  • Replacing 1970s–80s redwood decks
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Elevated deck on a hillside lotSide elevation of a hillside home with a deck cantilevering over a falling slope: a ledger at the house, tall braced posts on stepped footings set into the hill, open space under the deck, and oak-covered ridges with a tall peak in the distance. Ledger at the house Tall posts + bracing Footings set into slope Open space below: keep it clear Schematic, not to scale

Start with four details

A local deck builder will call to talk through size, height and materials.

No obligation. Your details go only to a local pro who can quote your project. Privacy

The builder may ask for photos of the area or the old deck when they call.

What are you planning?

Six kinds of deck projects

Pick the one closest to yours. Each page covers what's involved, what drives the price and what to ask a builder.

New deck

Ground-level to raised decks attached to the house, sized for how you'll use it.

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Replace an old deck

Tear out a tired redwood deck, or resurface it if the framing is sound.

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Composite & Trex-style

Capped composite boards, hidden fasteners, cable or aluminum rails.

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Deck repair

Soft boards, wobbly railings, rotted posts, leaking ledgers.

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Hillside & second-story

Tall posts, slope footings and engineering for Lamorinda lots.

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Fire-resistant decking

What California's ember rules require, and what's still pending.

Read more →

Cost

What a deck costs here

Angi puts the national average deck at $8,320, with most projects between $4,339 and $12,652+, or $30–$60+ per square foot (Angi, 2026 data). Walnut Creek-area decks are often larger, taller and on slopes, and Bay Area labor costs more, so quotes here commonly land above the national middle.

DeckAreaAt $30–$60+/sq ft
12 × 12 ft144 sq ft$4,320–$8,640+
14 × 20 ft280 sq ft$8,400–$16,800+
20 × 20 ft400 sq ft$12,000–$24,000+

National per-square-foot range applied to common sizes. Real quotes can land below or above.

Full deck cost guide: materials, height, stairs, demolition and resale →

Permits in two lines

Walnut Creek exempts only decks of 200 sq ft or less, no more than 30 in above grade, not attached to the house and not serving the required exit door (City of Walnut Creek). Attached or raised decks need a permit.

Deck permits by city →

Fire-zone note

Parts of Orinda, Moraga, Lafayette, Danville and Clayton are mapped Very High fire hazard. Deck surfaces within 10 ft of a new home there must meet California's wildfire tests. The statewide Zone 0 rules are not in force.

What applies and what's pending →

Materials

Decking materials, end-on

What the boards are made of decides the upkeep, the look, the heat underfoot and, near the house in a fire zone, whether it meets code.

Redwood

Warm red-brown, naturally decay-resistant heartwood, the classic East Bay deck. Price swings widely by grade.

Materials $5–$35+ /sq ft

Western red cedar

Lighter and softer than redwood, with similar natural resistance. Needs regular sealing to hold color.

Materials $3–$7+ /sq ft

Pressure-treated

The usual framing lumber under any deck. As decking it is the budget choice and needs stain or sealer.

Materials $2–$5+ /sq ft

Capped composite

Wood-plastic core with a protective shell. Low upkeep, grooved edges for hidden fasteners, gets warm in sun.

Materials $12–$22+ /sq ft

Fire-rated options

Decking that meets California's ember and flame tests: listed boards, fire-retardant-treated wood or noncombustible surfaces.

Materials Varies by product

Board-only material prices per square foot from Angi's deck cost guide (national). Labor, framing, railings and permits are extra.

Composite vs wood, side by side →

Elevated deck on a hillside lotSide elevation of a hillside home with a deck cantilevering over a falling slope: a ledger at the house, tall braced posts on stepped footings set into the hill, open space under the deck, and oak-covered ridges with a tall peak in the distance. Ledger at the house Tall posts + bracing Footings set into slope Open space below: keep it clear Schematic, not to scale

Hillside lots

Built for the slope

Lamorinda and the Walnut Creek hills put many decks on falling ground. That means taller posts with bracing, footings stepped into the hill, sometimes an engineer's design, and stairs down to the yard. It also leaves open space under the deck that needs to stay clear of stored firewood and debris.

Hillside and second-story decks →

Service area

Walnut Creek and the towns around it

Walnut Creek, plus Lafayette, Orinda and Moraga along Highway 24, and Danville, Alamo, Blackhawk and Diablo down I-680. Pleasant Hill, Concord and Clayton are close by.

  • LafayetteHillside lots, County inspections, protected oaks
  • OrindaVery High fire areas, MOFD rules, steep wooded lots
  • Danville1980s redwood decks, Blackhawk and Diablo HOA review
  • All service areasMoraga, Alamo, Pleasant Hill, Concord, Clayton

Check any contractor

Before you sign, look up the license at the CSLB license check. Deck work is usually done under a B (general building) or C-5 (framing and rough carpentry) license. Ask for proof of workers' compensation if they have employees, and keep the down payment to $1,000 or 10% of the contract, whichever is less.

How to choose a deck builder →

Common questions

How much does a 20×20 deck cost?
A 20×20 deck is 400 square feet. At Angi's national range of $30–$60+ per square foot, that's roughly $12,000–$24,000+ before Bay Area labor rates, stairs, railings, height and permits. Composite, a second story or a steep lot push it higher. See the deck cost guide for 12×12 and 14×20 examples.
Can I build a deck without a permit in California?
Sometimes, but rarely for a real backyard deck. Walnut Creek exempts decks that are 200 square feet or less, no more than 30 inches above grade at any point, not attached to the house and not serving the required exit door. Most attached or raised decks need a permit. Other cities and the County set their own rules; see deck permits.
How do I choose a deck contractor?
Check the license at the CSLB (a B general or C-5 framing contractor is typical), get at least two itemized bids that name the footing plan, framing lumber, ledger flashing, decking product, railing system and permit, and keep the down payment within California's limit of $1,000 or 10%, whichever is less. The builder checklist has the full list.
Do decks near the house have to be fire-rated?
For new homes in a fire hazard severity zone, the walking surface of any deck within 10 feet of the building must meet California's wildfire tests or be an approved material. Whether that reaches a replacement deck on an older home depends on your city's rules. The statewide "Zone 0" rules were adopted in August 2026 and then withdrawn from review, so they are not in force. Details on the fire-resistant decking page.
Composite or wood?
Composite costs more up front and needs less upkeep. Wood (redwood, cedar or pressure-treated) is cheaper to install and easy to repair, but needs regular sealing. The composite vs wood guide compares cost, upkeep, heat, fire behavior and resale.

Talk to a Walnut Creek-area deck builder

Share the size, height and what you have now. A local builder can walk the site and price it.

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