Do you serve my area?

We work within 50 miles of Seattle. That covers most of the Eastside, South King County, and Snohomish County.

Are you licensed and insured?

Yes. Fully licensed in Washington state and insured on every job.

How long does a typical deck build take?

Most residential decks take 3 to 7 days depending on size and complexity.

What materials do you work with?

Cedar, composite, pressure treated, ipe hardwood, and more.

Do I need a permit for a new deck?

Usually yes, depending on size and height. We handle the permit process for you.

How much does a new deck cost?

Most residential decks run between $15,000 and $50,000 depending on size, material, and scope.

Do you offer any kind of warranty?

Yes. We stand behind our work with a craftsmanship warranty on every project.

What makes Mill Decking different from other contractors?

We're a family business. The people who quote your job are the same people who build it. We've built 200+ decks across the PNW.

Project Details

Multi-level deck build with composite surface

A homeowner in Bellevue came to us wanting a multi-level outdoor space that could handle the grade change between their back door and the yard. We designed and built a two-tier composite deck system. Upper entertaining level off the main floor, lower patio level at grade. Aluminum railing throughout and a stair run connecting both levels. Full permit pulled and passed first inspection.

Client

David M.

Type

Residential

Duration

7 Days

Year

2025

Property type

Two-story craftsman home on sloped lot

Location

Bellevue, WA

Services

Multi-level deck design, composite installation, aluminum railing, stair system, permit management

Materials

TimberTech composite decking, powder-coated aluminum baluster railing, pressure-treated substructure, galvanized hardware

What we did

A two-tier system built around the natural grade of the lot.

Design and planning

Assessed the grade change and designed a two-level layout to work with it, not against it
Engineered footing placement for both levels independently
Pulled full permit and coordinated inspection before breaking ground

Build

Set footings and framed both deck levels with pressure-treated substructure
Installed TimberTech composite decking with hidden fastener system throughout
Built stair run connecting upper and lower levels with matching composite treads
Installed powder-coated aluminum baluster railing on all open sides
Final inspection passed first visit

Challenges we faced

Grade change and two independent structural systems on the same project.

Lower level footing depth required adjustment after discovering ledge rock at 18 inches
Stair run angle required a mid-span landing to meet code at the grade transition
Coordinating two-level framing on a sloped site required precise level checks throughout

Why this project stands out

A build that turned a difficult grade into the best feature of the backyard.

Two fully independent structural levels connected as one cohesive system
Hidden fastener composite throughout — clean surface, no visible screws
Full permit pulled, inspected, and passed without a single callback

Final result

A functional, beautiful two-tier outdoor space that the homeowner uses every week and has already referred us twice for.

David M.

Bellevue homeowner

"I didn't think the grade was workable. They designed around it and built something I didn't expect was possible. The whole thing passed inspection without a hitch."

Project Images