Deck remodeling, Greater Seattle Area
Deck Remodeling Tips to Upgrade Your Outdoor Space
Remodeling an existing deck costs $15,000+ to resurface a sound frame and $25,000+ to rebuild a rotted one in the Greater Seattle area. Check the posts, joists, ledger and footings first, because the frame decides the job. Then upgrade the railing, stairs or lighting, or add a roof cover from $20,000+.
The code rules below are Seattle's, and other cities set their own. Book a Consultation and we open up a few boards before we price your deck.
What should you check before remodeling an existing deck?
Check the structure before you pick boards or a stain color. Gray, cupped boards and a railing that moves when you lean on it are the signs on top. Rot in the posts, joists and ledger is the part you cannot see from above. On our Deck Builder Across the Greater Seattle Area page we say it plainly: "We look under the boards at the framing, ledger and footings before we price."
The ledger is where the deck meets the house. The 2021 Seattle Residential Code, Section R507.8 (PDF page 45), says the attachment "shall not be accomplished by the use of toenails or nails subject to withdrawal." It adds: "Where positive connection to the primary building structure cannot be verified during inspection, decks shall be self-supporting." Section R507.9.1.1 (PDF page 45) says "Deck ledgers shall not be supported on stone or masonry veneer." Section R507.2.4 (PDF page 29) requires flashing of corrosion-resistant metal or an approved nonmetallic material.
On a Mercer Island deck in 2022, the deck looked tired from above. Opening it up showed rotted posts, joists, rim and rail boards, so staining or new boards alone would not have fixed it. That rebuild cost about $35,000.
Should you repair, resurface or rebuild your deck?
The framing decides it. When the joists, posts and ledger are sound, keep the frame and replace or refinish the surface. When they have rotted, a rebuild is the safe choice. Our Basic resurface includes frame inspection and repairs up to 10%, as listed on our deck price table. Rot found in the house rim or ledger, and siding repair at the ledger, are priced on their own line.
A refinish is the smallest job. On a Bellevue view deck in 2021 the boards and the white lattice railing stayed. The gray surface was cleaned first, then every board was stained a deep red-brown. That refinish cost about $15,000.
| Frame condition | Job | What changes | Starts at | Time on site |
|---|---|---|---|---|
| Sound frame, tired surface | Refinish | Boards cleaned, sanded and stained; loose rail parts and hardware replaced | $15,000+ | 1 to 2 weeks |
| Sound frame, worn boards | Resurface | New boards and stair treads on the kept frame | $15,000+ | 1 to 2 weeks |
| Rotted posts, joists or ledger, one level | Rebuild | Old deck removed; new footings, framing, decking and railing | $25,000+ | 2 to 4 weeks |
| Rotted frame on a raised or multi level deck | Replace with a new elevated deck | Engineered posts, beams and footings; ledger flashing at the house | $45,000+ | 4 to 8 weeks |
| Any sound deck | Roof cover | Solid roof over the deck | $20,000+ | 1 to 3 weeks |
Source: Deck Builder Across the Greater Seattle Area, deck prices and scope by type, October 2026. Basic tier starting prices. Time on site is after permits.
Does a deck remodel need a permit in Seattle?
A like-for-like repair usually does not. A rebuild of a raised deck does. The 2021 Seattle Residential Code, Section R105.1 (PDF page 6), requires a permit before "erecting, constructing, enlarging, altering, repairing, moving, improving, removing, changing the occupancy of, or demolishing" a structure, unless Section R105.2 (PDF page 7) exempts the work.
Three R105.2 items matter for a deck. Item 2 exempts "in-kind or similar replacement of or repair of deteriorated members of a structure", "provided no changes are made to the building envelope". Item 1 exempts minor repairs of $6,000 or less in any six month period, which "shall not include the removal, reduction, alteration or relocation of any loadbearing support." Item 7 exempts "Platforms, walks and driveways not more than 18 inches above grade and not over any basement or story below." Section R105.3 adds that separate electrical and other permits may be required for exempt work.
So replacing rotted boards or framing members in kind fits item 2. Rebuilding a deck that sits more than 18 inches above grade or over a basement or story below, or making such a deck larger, goes through a permit. Seattle permits through SDCI take 4 to 8 weeks, and Eastside cities usually take 2 to 4 weeks.
Which decking material should you choose when you resurface a deck?
Pick the boards by upkeep and budget. The tiers and the composite premium are on our deck price table.
Composite boards can go on a kept frame only when the joists suit them. Section R507.2.2.1 of the 2021 Seattle Residential Code (PDF page 28) requires a label on composite boards that shows the allowable load and the maximum allowable span. Our Mid-Range resurface adds hidden fasteners and joist protection tape on the old joists.
If you keep wood boards, clean before you stain. On the Bellevue deck the gray surface and dark spots came off first, so the stain went on evenly from the walkway to the corner.
How do you upgrade deck railings and stairs?
Replace the railing when it moves or when you want a new look, and rebuild stairs when treads are soft. The guard and stair height rules are in Five Tips Before Installing a New Outdoor Deck. Wood railing is the simplest. Composite and aluminum sit in our Mid-Range tier, and glass or cable in Luxury. A glass railing may need an engineer.
A new cap rail can change how a railing feels without replacing it all. On a Seattle home in 2023 the white railings match the house trim, and a wood-grain cap rail on the stairs gives a warmer handrail to hold. For our remodeling work in the city, see Home Remodeling Contractors in Seattle, WA.
How do you add lighting or a roof cover to an existing deck?
Plan both with the remodel, because the wiring and posts go in before the boards. Our Mid-Range elevated decks include lighting on the stairs, and Luxury decks include built in stair and post lighting. Electrical work beyond deck lighting is priced on its own line.
A solid roof cover over a deck starts at $20,000+ and adds 1 to 3 weeks on site. A cover is a roof, so for the choices that go into one, read Roof Construction: Top 7 Factors to Consider. For heat and winter use under the cover, read How to Create a Winter-Friendly Outdoor Living Space.
How much does it cost to remodel a deck in the Greater Seattle area?
Resurfacing a sound deck starts at $15,000+. A rebuild as a new single level deck starts at $25,000+. A new elevated or multi level deck starts at $45,000+. The table above sets each price against the frame condition.
Starting prices leave out permit fees, rot in the house rim or ledger, siding repair at the ledger, engineering for steep slopes and hot tub support. Our own jobs show the range: about $15,000 for the Bellevue refinish in 2021 and about $35,000 for the Mercer Island rebuild in 2022. Prices have risen since each was completed.
What happens when we remodel your deck?
We measure the deck, check its height above grade, and open up a few boards to see the framing and how the ledger meets the house. Then we price the work in writing, line by line, and file the permit when the job needs one. One project manager runs the repairs, decking, railings and stairs, books each inspection, then walks the finished deck with you.
We remodel decks across King and Snohomish counties, from Seattle and the Eastside north to Snohomish. See Home Remodeling Contractors in Mercer Island, WA for our work on the island.
Frequently Asked Questions
Can I put a hot tub on my existing deck?
Only if the frame is built for it. Hot tub support is not included in our starting prices, so we check the framing and footings and price any added support in writing.
What does a deck remodel cost per square foot?
Square footage is a weak guide. Height, stairs and railing move the price more than size, so use the starting prices by job in the table above.
What warranty comes with a deck remodel?
Every deck we build or remodel carries a 2-year workmanship warranty, which can be extended up to 5 years for an added charge. The decking and railing carry their manufacturer's warranty.
