Deck & Patio Builders in Seattle: Compare Options & Costs for 2026

Should you add a deck, a patio, or both? If you're a Seattle homeowner staring at your backyard trying to figure out the best move, that question matters more here than almost anywhere else. Our rain, our soil, our building codes — they all push the answer in specific directions depending on your lot, your budget, and how you actually want to use the space.

Here's what you need to know before you call a contractor.

For a broader look at deck pricing across different materials and regions, see our complete deck cost guide. Timing your build right can also save thousands — check our guide on the best time to build a deck.

Deck vs Patio: Which Is Right for Your Seattle Home?

The decision isn't just about looks. In Seattle, it's driven by your yard's slope, drainage, and how much maintenance you're willing to handle in a climate that dumps 37+ inches of rain annually.

When a Deck Makes More Sense

• Sloped lots. Huge portions of Seattle — Capitol Hill, Queen Anne, West Seattle — sit on hills. A deck on posts can turn an unusable slope into functional outdoor living space without expensive grading.
• You want elevation. A raised deck off a second-story living area is common in split-level Seattle homes. It gives you views and keeps the living space connected to the outdoors.
• Drainage is poor. If your yard stays soggy from October through May (and let's be honest, it usually does), a deck elevates you above the mud.

When a Patio Makes More Sense

• Flat yards with good drainage. If you've got a level lot in neighborhoods like Ballard, Ravenna, or parts of Greenwood, a ground-level patio can be simpler and cheaper.
• You want low long-term cost. Concrete and pavers don't rot. In Seattle's constant moisture, that's a real advantage.
• Fire pits and heavy furniture. Patios handle weight and open flames without the structural concerns that come with decks.

The Seattle-Specific Factor

Moisture is the enemy of every outdoor surface here, but it attacks decks and patios differently. Decks face mold, algae growth, and wood rot — especially on north-facing sides that never fully dry out. Patios deal with moss buildup, efflorescence on pavers, and cracking if the base wasn't properly compacted. Neither is maintenance-free, but patios generally require less ongoing work in our climate.

Cost Comparison: Deck vs Patio in Seattle

Here's where most homeowners start making real decisions. These are 2026 installed prices for the Seattle metro area, including labor and materials.

Deck Costs (Installed, Per Square Foot)

Patio Costs (Installed, Per Square Foot)

The bottom line: A 300 sq ft patio runs $2,400–$9,000 depending on material. The same size deck costs $7,500–$22,500. That's a significant gap, and it's the main reason patios win on pure budget comparisons.

But budget alone doesn't tell the whole story. If your lot slopes more than a few feet, the grading and retaining walls needed for a patio can erase that cost advantage fast. For more on how deck sizes affect your total investment, check out our guide to 16x20 deck costs for reference pricing at common dimensions.

Combined Deck & Patio Designs

Some of the best outdoor spaces in Seattle use both. This isn't just a design trend — it's practical.

Popular Combinations

• Raised deck stepping down to a paver patio. The deck connects to your main floor; the patio creates a ground-level gathering area below. Works beautifully on Seattle's sloped lots.
• Ground-level deck with adjacent concrete patio. The deck serves as the dining area (softer underfoot, warmer in cool weather), while the patio handles the grill station and fire pit.
• Wraparound deck with a patio courtyard. Common in larger Magnolia and Laurelhurst properties where the backyard has distinct zones.

What This Costs

A combined project for a 200 sq ft deck + 150 sq ft paver patio typically runs $12,000–$22,000 in Seattle, depending on materials and site prep. You'll often save 10–15% by hiring one contractor for both rather than splitting the work.

Use PaperPlan to visualize different decking materials on your own home before committing — it helps when you're trying to see how a composite deck will look next to stone pavers.

Materials for Each: What Works in Seattle's Rain

Seattle's climate isn't extreme — no brutal freezes, no scorching summers. But the constant moisture and mild temperatures create ideal conditions for mold, mildew, and algae. Your material choice needs to account for this.

Best Deck Materials for Seattle

Composite and PVC decking resist moisture best and are the top recommendation for Seattle builds. They won't rot, don't need annual sealing, and most brands now include anti-slip texturing — critical when your deck is wet eight months of the year.

• Composite (Trex, TimberTech, Fiberon): The sweet spot for most Seattle homeowners. Resists moisture, fading, and staining. Expect to pay $45–$80/sq ft installed. Capped composites perform significantly better than uncapped in our humidity.
• PVC (AZEK, TimberTech Advanced PVC): Even more moisture-resistant than composite. Lighter weight, won't absorb water at all. Premium price at $55–$85/sq ft installed, but virtually zero rot risk.
• Cedar: A Pacific Northwest classic, and it does contain natural oils that resist decay. But in Seattle's rain, you're looking at cleaning and sealing every 1–2 years or it grays and develops mold. Beautiful if you commit to the upkeep.
• Pressure-treated wood: The budget option. It'll last, but it demands the most maintenance in our climate. Plan on power washing yearly and restaining every 2–3 years.

If you're weighing composite brands specifically, our breakdown of the best composite decking options in Canada covers brand comparisons that apply to the Pacific Northwest market too.

Best Patio Materials for Seattle

• Concrete pavers are the go-to. They drain well (critical here), individual pavers can be replaced if they crack or shift, and moss can be pressure-washed off without damaging the surface.
• Poured concrete works but can develop surface cracks over time with our wet/dry cycling. Stamped concrete is especially prone to sealer wear in constant rain — budget for resealing every 2–3 years.
• Natural stone (flagstone, bluestone) handles moisture well and looks at home in Seattle's lush, green backyards. The irregular surface can get slippery with moss, so plan for periodic cleaning.
• Porcelain pavers are gaining popularity in Seattle. They're essentially non-porous, so mold and staining are minimal. Higher upfront cost, lower lifetime maintenance.

Drainage and Substructure: Don't Skip This

In Seattle, what's under your patio matters as much as what's on top. Any reputable local contractor will insist on:

• 6–8 inches of compacted gravel base for pavers
• Proper slope (minimum 1% grade away from your foundation)
• French drain or channel drain integration if your yard sits low

For decks, make sure your builder addresses airflow underneath the structure. Enclosed deck undersides trap moisture in Seattle's climate and accelerate rot on joists and beams. Adequate ventilation or a below-deck drainage system is worth the investment.

Finding a Contractor Who Does Both

Here's a Seattle-specific reality: many deck builders don't do hardscaping (patios), and many hardscapers don't build decks. If you want a combined project, you need to find the right fit.

What to Look For

• A general contractor or outdoor living specialist who subcontracts both trades, or a company that genuinely employs both skill sets in-house.
• Experience with Seattle's soil conditions. Our clay-heavy soil shifts with moisture. Contractors unfamiliar with this underestimate foundation requirements.
• Licensed, bonded, and insured in Washington State. Verify their contractor license through the Washington Department of Labor & Industries (L&I). This isn't optional — it's state law.

Questions to Ask

1. "Do you build both the deck and patio, or will you sub out one part?" (Neither answer is wrong, but you want to know.)
2. "How do you handle drainage between the deck and patio areas?"
3. "Can you show me a Seattle project where you've built a combined deck and patio?"
4. "What's your typical lead time for a summer build?" (In Seattle, dry season bookings fill fast — booking in winter for a June–September build is standard.)

The Timing Factor

June through September is prime building season in Seattle. Rain delays during the rest of the year can stretch a two-week project into four or five weeks. Most experienced Seattle contractors won't pour concrete or set pavers in steady rain — the results suffer.

Book your contractor by January or February if you want a summer build slot. By March, the best crews are often fully scheduled through fall. For insight into how renovation timelines work in practice, our backyard renovation timeline guide breaks down what to expect at each phase.

Permits: Deck vs Patio Requirements in Seattle

This is where decks and patios diverge sharply from a regulatory standpoint.

Deck Permits in Seattle

In Seattle, deck permits are typically required for structures over 200 sq ft or more than 30 inches above grade. You'll need to work with Seattle's Department of Construction & Inspections (SDCI).

Expect to provide:

• Site plan showing the deck's location relative to property lines and your house
• Structural drawings including footing details, beam spans, and joist spacing
• Footing depth at or below the frost line — 12–24 inches in Seattle

Permit fees vary but generally run $150–$500+ depending on project scope. Turnaround time is typically 4–8 weeks for residential deck permits, though expedited review is sometimes available.

Important: Attached decks (bolted to your house) face stricter requirements than freestanding structures. If you're considering that route, our article on attached vs freestanding deck permits explains the key differences. And if you're wondering about the risks of skipping the permit process, read our piece on building a deck without a permit — the consequences apply broadly.

Patio Permits in Seattle

Ground-level patios typically do not require a building permit in Seattle, provided they:

• Are at or near grade level (not elevated)
• Don't include roofed structures (pergolas, covered patios may need permits)
• Don't alter drainage in a way that affects neighboring properties
• Comply with lot coverage limits in your zoning district

Covered patios and any structure with a roof will likely need a permit. If you're adding electrical (for lighting, outlets, or a hot tub), you'll need a separate electrical permit regardless.

Setback Requirements

Both decks and patios must respect Seattle's setback requirements — typically 5 feet from side property lines and 25 feet from the rear in most residential zones, though this varies by zoning. Check your specific lot through Seattle's GIS portal or call SDCI before finalizing your design.

Frequently Asked Questions

How much does it cost to build a deck and patio in Seattle?

A combined deck and patio project in Seattle typically costs $12,000–$30,000+ depending on size, materials, and site conditions. A basic 300 sq ft pressure-treated deck runs $7,500–$13,500, while a 200 sq ft paver patio adds $3,000–$6,000. Composite decking with natural stone pavers on a sloped lot can push total costs above $35,000. Get at least three quotes — pricing varies significantly between contractors in the Seattle market.

What's the best decking material for Seattle's rainy climate?

Composite and PVC decking are the best performers in Seattle's wet climate. They resist mold, algae, and rot without annual sealing or staining. Capped composite boards (Trex Transcend, TimberTech PRO, Fiberon Sanctuary) outperform uncapped versions by preventing moisture absorption at the edges. Cedar is a solid natural option if you're committed to cleaning and sealing every 1–2 years. For a deeper dive into low-maintenance decking options, we've compared the top brands side by side.

Do I need a permit for a patio in Seattle?

Most ground-level patios in Seattle do not require a building permit. However, you will need a permit if your patio includes a roof or cover, involves significant grading, or triggers electrical work. Decks are different — any deck over 200 sq ft or more than 30 inches above grade requires a permit from Seattle's Department of Construction & Inspections. When in doubt, call SDCI at (206) 684-8600 before you start.

When is the best time to build a deck or patio in Seattle?

June through September offers the driest conditions and the most predictable construction schedule. But here's the catch: every contractor in the region knows this, and so does every homeowner. The best builders book up months in advance. Start getting quotes in January or February and sign your contract by March to lock in a summer build slot. Some concrete and paver work can happen in late spring or early fall, but framing and finishing work is best done during the dry months.

Can one contractor build both my deck and patio?

Yes, but you need to find the right one. Look for outdoor living specialists or general contractors who handle both structural deck building and hardscaping. Some firms subcontract one trade — that's fine as long as they manage the project and coordinate drainage, grading, and transitions between the two surfaces. Ask to see completed projects that include both elements, and confirm all workers carry proper Washington State contractor licensing through the Department of Labor & Industries.