Before you start planning your new deck, it’s worth answering one question first: does it need a building permit? The answer depends on your deck’s size and height, and on whether you’re in Tacoma, Federal Way, or elsewhere in Pierce or King County, since permit rules are set locally, not statewide. Here’s a straightforward breakdown so you know what to expect before you build.
The General Rule in Washington State
Most Washington jurisdictions follow a version of the International Residential Code, which generally exempts decks that are both under 200 square feet and no more than 30 inches above grade at any point, as long as the deck doesn’t serve as an exit from a required egress door and isn’t attached to a structure with utilities running through it. If your deck is larger than that, attached to the house, or built over 30 inches high, you’ll almost always need a permit. That said, “generally” is doing a lot of work in that sentence, because the exact threshold and paperwork requirements vary by city and county.
Tacoma and Pierce County Deck Permits
Tacoma and unincorporated Pierce County both require a permit for most attached decks, especially anything that ties into the house’s structure or sits above the exempt height threshold. Pierce County has offered fast-track or predesigned permit options for straightforward deck projects in the past, which can speed up approval compared to a fully custom design. Because requirements can shift, it’s worth confirming current thresholds with Tacoma Permits or Pierce County’s Development Center before finalizing your design, or letting your contractor handle that confirmation for you.
Federal Way, Kent, Renton & King County Deck Permits
Federal Way, Kent, Renton, Maple Valley, and other King County cities generally follow the same IRC-based exemption logic, but each jurisdiction issues and reviews its own permits, and some have adopted local amendments. A deck attached to your home, built over a certain height, or located near a property line or critical area (like a steep slope or wetland buffer, which are common in parts of King County) is more likely to need review beyond a basic permit. As in Pierce County, confirming with your specific city’s permit center before construction starts is the safest way to avoid a stop-work order mid-project.
Why It’s Worth Getting a Permit Even When It’s Optional
Even for smaller, technically-exempt decks, there are good reasons to loop in your local building department. An inspected deck is documented as code-compliant, which matters if you ever sell your home, since unpermitted structural work can come up during a home inspection or title search and slow down a sale. Permits also mean an inspector checks the footings, ledger board attachment, and railing height, which are exactly the spots where deck failures tend to happen when they’re skipped.
Deck Permit FAQ
Who is responsible for pulling the permit, me or my contractor?
A licensed contractor can pull the permit on your behalf as part of the project, which is usually simpler than doing it yourself since they’re already familiar with your jurisdiction’s submittal requirements. If you’re acting as your own general contractor, you can typically pull owner permits directly, though you take on more of the compliance responsibility.
What happens if I build a deck without a required permit?
Building without a required permit can result in a stop-work order, fines, and being required to open up finished work for a retroactive inspection. It can also complicate insurance claims and home sales down the road, since unpermitted structural additions often have to be disclosed.
We Handle the Permitting for You
Figuring out exactly which permits apply to your project is one more thing on an already long list when you’re planning a new deck. Elevate Exteriors builds decks throughout Tacoma, Federal Way, and the greater South Sound, and we handle the permitting process as part of every deck building project, including our work in Tacoma and Puyallup. Contact us for a free consultation and we’ll walk you through what your specific project will need.