Deck Builders Near Me in the Bay Area, CA? Build Your Own Deck With an A-DIY Kit

There are deck contractors in every Bay Area county, from San Francisco and the East Bay to the South Bay, Peninsula and North Bay. Good ones stay busy, so compare written quotes and check each license with the California Contractors State License Board. For a ground-level deck, many homeowners skip the wait: A-DIY delivers professionally engineered wood and composite deck kits across the region, and you or a local handyman can assemble one with just a drill.

Contractor pricing varies across the nine counties, but Bay Area labor costs are some of the highest in the country, and permits, access and hillside engineering add more. A-DIY kits cost the same whether you live in Santa Rosa or San Jose: $3,699 for a 6x12 wood kit up to $12,799 for a 16x28 composite kit, with framing, decking, Tuff Block footings and hardware included. Homeowners typically spend 30–50% less than hiring a contractor.

With A-DIY, a 12x12 deck kit is $4,899 in pressure-treated wood or $5,700 in composite. A 12x16 composite kit is $6,600; the closest wood size is 12x18 at $5,969. A 16x20 kit is $7,600 in wood or $10,199 in composite. Framing, decking, footings and hardware are included.

There is no single Bay Area permit office. Inside a city, apply to that city’s building department, such as San Francisco’s Department of Building Inspection, Oakland’s Planning & Building Department or San José’s Planning, Building and Code Enforcement. In unincorporated areas, the county issues permits, for example Santa Clara County Planning and Development, San Mateo County Planning and Building, Contra Costa County Conservation and Development, the Marin County Community Development Agency or Permit Sonoma.

The California Residential Code starting point is a freestanding deck of 200 sq ft or less, no more than 30 inches above grade, that does not serve a required exit door. Cities word this differently, though. San José requires a permit at 200 sq ft or greater and for decks that serve as a door landing, while Belmont exempts decks of 200 sq ft or less. A-DIY’s 12x12 and Compact kits come in under 200 sq ft and assemble 15–17 inches off the ground. Always check with your own city or county.

Many customers use their A-DIY decks for hot tubs and saunas. Applicable configurations are engineered to hold up to 15,000 lbs when properly assembled and supported, but tub weight, placement and wiring vary, so talk to a deck specialist before you order and check local electrical and permit rules.

Frost is rarely the issue here. Soil and slope are. Expansive clay is common in the valleys, and many homes in the hills sit on steep lots. Attached and elevated decks need engineered footings approved by the local building department. A freestanding floating deck, like an A-DIY kit on adjustable Tuff Block footings, needs firm, compacted, nearly level ground. Check it for level after the rainy season.

A lot. Normal yearly rainfall runs from about 13.5 inches in San Jose to about 23 inches in downtown San Francisco and nearly 34 inches in Santa Rosa. Foggy coastal and bayside neighborhoods keep decks damp and salty, so rinse the surface and check hardware each year. Hot inland valleys like Livermore and Concord are harder on wood finishes. Seal pressure-treated wood every one to two years, or choose composite decking, which never needs staining.

Yes, in designated areas. In 2025, CAL FIRE released updated local Fire Hazard Severity Zone maps for about 125 Bay Area and North Coast cities and counties, and local governments are adopting them. In designated zones, California Residential Code Section R337 (the residential version of Building Code Chapter 7A) limits the decking used within 10 feet of a building to approved materials, such as noncombustible, ignition-resistant or fire-retardant-treated products. Check your address at osfm.fire.ca.gov/FHSZ and ask your building department.

Pressure-treated wood kits come in 15 sizes: Standard 12x12, 12x18, 12x20, 12x24, 12x28, 16x16, 16x20, 16x24 and 16x28, plus Compact 6x12, 6x16, 6x20, 8x12, 8x16 and 8x20. Composite kits come in 9 sizes from 12x12 to 16x28 in Amazon Gray or Forest Wood. Custom sizes are available on request.

The dry season, roughly April through October, is easiest almost everywhere in the region. Inland, build in the cooler mornings during summer heat waves. Along the coast, foggy summer mornings often clear by afternoon, and early fall is usually sunny and calm. Order during the winter rains and use the $250 A-DIY Reserve deposit to hold today’s price for the delivery date you choose.

Yes. A-DIY delivers to all nine counties: Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara, Solano and Sonoma. Kits ship by LTL freight with curbside delivery, typically within 10–14 business days. In dense neighborhoods, plan where the freight can be dropped and how you will get it to the backyard. You can pay in full, use the $250 A-DIY Reserve, split the cost into 0% payments over up to 8 months, or build now and pay later with Affirm, Klarna or Shop Pay, subject to approval.