Decks

Deck Building and Repair in Seattle

Custom deck building, waterproof composite decking, and deck repair for Seattle homes. Extend your outdoor living space with K Single Corp.

Get a Free Estimate Call (206) 659-4349

25+

Years Experience

15,000+

Projects Completed

4.7★

Google Rating

10-Year

Workmanship Warranty

A new deck in Seattle typically costs $5,000 to $25,000 depending on size, materials, and design. K Single Corp builds custom residential decks using composite, waterproof, and traditional wood materials, creating outdoor living spaces designed for year-round enjoyment in the Pacific Northwest.

Waterproof composite decking is the ideal choice for the Pacific Northwest because it handles Seattle’s wet conditions without the constant upkeep that wood demands. Products from Trex, TimberTech, and Fiberon resist moisture, rot, mold, and insect damage without needing annual staining, sealing, or sanding. A composite deck looks great on day one and still looks great a decade later with nothing more than occasional cleaning.

Why Decks

What Sets Us Apart

Waterproof Composite Systems

Trex, TimberTech, and Fiberon decking that resists moisture, rot, mold, and insects. No annual staining or sealing required.

Wood Deck Options

Pressure-treated lumber and cedar decking for homeowners who prefer natural materials and a traditional look.

Permits Handled

We manage all building permits, structural engineering requirements, and city inspections as part of our service.

Year-Round Outdoor Living

Waterproof under-deck systems create dry covered space below upper-level decks, even during Seattle's rainy months.

At a Glance

Typical Cost

$5,000 – $25,000

WA License

KSINGSC842B3

Credentials

Licensed, Bonded, Insured

Service Area

King, Snohomish, Pierce

Warranty

10-year workmanship

Get a Free Estimate

How Much Does Decks Cost?

$5,000 – $25,000

Cost Calculator Get a Quote

Our Decks Process

Consultation and Design

We visit your home, discuss your vision, measure the space, and review material options within your budget.

Permitting

We handle all building permits, structural engineering, and scheduling of required city inspections.

Site Preparation

We clear the area, set footings or posts per engineering specs, and establish a level foundation.

Framing and Decking

Structural framing built to code, followed by surface board installation with consistent spacing and clean lines.

Railing and Finishing

Railing installed to meet code height and spacing requirements. Final city inspection and project walkthrough.

Consultation and Design

We visit your home, discuss your vision, measure the space, and review material options within your budget.

Permitting

We handle all building permits, structural engineering, and scheduling of required city inspections.

Site Preparation

We clear the area, set footings or posts per engineering specs, and establish a level foundation.

Framing and Decking

Structural framing built to code, followed by surface board installation with consistent spacing and clean lines.

Railing and Finishing

Railing installed to meet code height and spacing requirements. Final city inspection and project walkthrough.

4.7 from 171+

What Our Customers Say

Read all reviews

K Single was recommended by another roofing company and we are really glad that we went with them. Out of all the estima...

Timea Tihanyi

Google Review

Isidro and his crew are fantastic. Isidro is prompt to investigate an issue when asked, thorough in his explanation on t...

Cathy Dang

Google Review

I was very impressed with the job they did on my roof and covered patio, they cleaned up every day after working and the...

Rokodad

Google Review

We recently contracted K Single Corp to repair and reconstruct our bedroom level deck. Isidro Amaya was prompt in provid...

Dave Lipps

Google Review

K Single Corp demonstrates professionalism, competence and responsiveness in roof repair services. Isidro and his crew h...

Ronald Ward

Google Review

Love the new front porch, stairs and pavers. From beginning to end K Single Corp did a great job. I will definitely use...

DJ Rock

Google Review

Common Questions

Frequently Asked Questions

How much does a new deck cost in Seattle?

A new deck in Seattle typically costs $15,000 to $45,000 depending on size, material, and complexity. A basic 300 sq ft pressure-treated wood deck starts around $10,000 to $15,000. A 400 sq ft composite deck with railing runs $20,000 to $35,000. Large multi-level or waterproof under-deck systems can exceed $40,000.

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

Composite decking (Trex, TimberTech, or Fiberon) is the best choice for Seattle because it resists moisture, rot, mold, and insect damage without the constant maintenance that wood requires. Waterproof composite systems are ideal for covered upper decks where you want dry space below.

How long does composite decking last?

High-quality composite decking lasts 25 to 50 years with minimal maintenance. Unlike wood, it does not rot, warp, splinter, or require annual staining. Most premium composite products come with 25-year or lifetime manufacturer warranties.

Do I need a permit to build a deck in Seattle?

Yes. Most deck construction in Seattle and surrounding cities requires a building permit, especially for elevated decks, decks attached to the house, and structures over 30 inches above grade. K Single Corp handles all permitting and inspections as part of our service.

How long does it take to build a deck?

A standard residential deck takes 1 to 3 weeks to build, depending on size, design complexity, and weather. Simpler ground-level decks can be completed in a week. Multi-level decks, wrap-around designs, or builds with integrated features like built-in seating or pergolas take longer.

Can you repair my existing deck?

Yes. We repair and restore existing decks, including replacing rotted boards, reinforcing structural framing, installing new railing systems, resurfacing with composite over existing framing, and addressing safety concerns like loose steps and wobbly rails.

What is a waterproof deck system?

A waterproof deck system creates a dry space beneath an upper-level deck. Using a specialized membrane or interlocking deck board system, water is channeled away from the surface and drained through a gutter system below. This lets you use the space under the deck as a covered patio even during rain.

Does a new deck increase home value?

Yes. A well-built deck typically returns 65 to 75 percent of its cost in home value. Composite decks tend to recoup a higher percentage than wood because buyers appreciate the low maintenance. In Seattle, where outdoor living is valued despite the rain, covered and waterproof decks are especially attractive to buyers.

Serving the Greater Seattle Area

Licensed, bonded, and insured across King, Snohomish, and Pierce counties.

Seattle Bellevue Redmond Kirkland Renton Kent Tacoma Burien Issaquah Bothell All Service Areas

Other Services We Offer

From roofing to siding, gutters, decks, and more. K Single Corp handles it all.

Residential Roofing

Complete residential roofing services for Seattle-area homeowners. From full replacements to storm damage repairs, K Single Corp delivers proven results backed by 25+ years of experience.

Commercial Roofing

Reliable commercial roofing for Seattle-area businesses. TPO, PVC, metal, and flat roof systems installed and maintained by K Single Corp's experienced crew.

Roof Installation

Professional new roof installation for Seattle homes and businesses. Every material type, expert crews, and a 10-year workmanship warranty from K Single Corp.

Roof Repair

Fast, reliable roof repair for Seattle homes and businesses. Fix leaks, storm damage, missing shingles, and flashing failures. Emergency service available.

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