Decks & Patios Contractors in Seattle, Washington
Deck building, patio installation, and outdoor living spaces..
Deck and patio contractors build new outdoor living spaces and replace aging structures using wood, composite decking, pavers, stamped concrete, and natural stone. Pressure-treated lumber is the most affordable decking material, while composite (Trex, TimberTech) offers low maintenance and longer warranties at a higher upfront cost. Decks attached to a house require a building permit and must meet code for ledger board attachment, joist spacing, railing height, and stair dimensions — improperly attached decks are a serious safety hazard. Patios are typically ground-level and may not require permits, but proper base preparation and drainage are critical for longevity.
104
Listed contractors
5
Avg rating (1 rated)
$4k–$20k
Typical cost
Top rated decks & patios contractors in Seattle
What to look for when hiring a decks & patios contractor
- ✓Confirm the estimate specifies the decking material, framing lumber, and fastener system.
- ✓Ask about their approach to ledger board attachment and flashing — the #1 point of deck failure.
- ✓Verify they pull the required building permit for any attached or elevated deck.
- ✓Ask about the warranty on both materials and workmanship.
Decks & Patios contractors in Seattle(60 listed)
How much does decks & patios cost in Seattle?
Pressure-treated wood deck: $15–$25/sq ft. Composite deck: $25–$50/sq ft. Paver patio: $12–$25/sq ft. A typical 300 sq ft deck runs $4,500–$15,000.
Decks & Patios contractors in Seattle — FAQ
How many decks & patios contractors are in Seattle?
EdgeLocal lists 104 licensed decks & patios contractors in Seattle, Washington. All listings are sourced from state licensing registries.
What is the average rating for decks & patios contractors in Seattle?
Decks & Patios contractors in Seattle have an average Google rating of 5 stars across 1 rated contractor on EdgeLocal. Ratings are sourced from Google Business profiles.
Do decks & patios contractors in Seattle need to be licensed?
Yes. Washington requires decks & patios contractors to hold a valid state license. Always verify a contractor's license is current and in good standing before signing any contract or allowing work to begin.
How do I find a reliable decks & patios contractor in Seattle?
Start by verifying the contractor holds a valid Washington license. Check their Google rating and read reviews. Get at least three written estimates. Confirm they carry general liability and workers' compensation insurance. Ask for references from recent Seattle jobs.
General Decks & Patios FAQs
How much does a new deck cost?
A pressure-treated wood deck costs $15–$25 per square foot, making a typical 300 sq ft deck $4,500–$7,500. Composite decking (Trex, TimberTech) costs $25–$50 per sq ft, or $7,500–$15,000 for 300 sq ft. Cedar and redwood fall in between at $20–$35 per sq ft. These prices include framing, decking, railing, stairs, and basic hardware. Elevated decks, complex shapes, and built-in features (benches, planters, lighting) add cost. Permits are required for any attached or elevated deck in most municipalities.
How long does a deck last?
Pressure-treated wood decks last 15–25 years with regular maintenance (staining or sealing every 2–3 years). Cedar and redwood last 15–20 years. Composite decking lasts 25–50 years with minimal maintenance (occasional cleaning). The substructure (joists and beams) typically outlasts the decking surface. The most common point of failure is the ledger board connection to the house — improper flashing here allows water intrusion that rots the rim joist. Composite decking eliminates the staining and sealing maintenance cycle but costs 50–100% more upfront.
Do I need a permit to build a deck?
In most jurisdictions, yes. Attached decks (connected to the house) and elevated decks (more than 30 inches above grade) almost always require a building permit. Freestanding ground-level decks (under 30 inches, not attached to the house) may be exempt in some municipalities, but check your local building department. Permits ensure the deck meets structural code requirements for footings, joist spacing, ledger attachment, railing height, and stair dimensions. Your deck builder should include permit costs in their estimate and manage the permit and inspection process.