What Size Deck Can I Build Without a Permit?

Building a deck can be a great addition to your home, offering outdoor space for relaxation, entertainment, and increasing property value. But before getting started, it’s important to understand local building codes and permitting requirements in Washington, particularly in Tacoma and the surrounding areas.

Washington State Deck Permit Requirements

In Washington, the law provides some flexibility when it comes to building certain types of smaller decks without needing a permit. According to the state’s building code, you can build a detached platform deck without a permit, as long as it meets the following criteria:

Height Restrictions: The deck must be no more than 30 inches above grade (ground level). This is measured from the lowest point of the deck to the ground. If the height exceeds 30 inches at any point, a permit will be required.

Size Restrictions: A freestanding deck greater than 200 square feet will require a permit.

Location: The deck cannot be built over any basement, story, or other structure. In other words, it must be freestanding and not attached to a home or other building.

Use and Safety: While small, detached decks may not require permits, they still need to be built safely, adhering to the general building standards to ensure stability and prevent accidents.

Why These Rules Matter

These regulations are in place for safety reasons. Decks higher than 30 inches pose a greater fall risk, so they require permits to ensure they are structurally sound and meet building codes. If you’re building a larger or attached deck, it’s essential to go through the permitting process to avoid fines and ensure your deck is safe for use.

Planning Your Deck Without a Permit

If you’re planning to build a simple, detached deck that’s low to the ground, you can enjoy the benefit of skipping the permit process. However, keep in mind that even if a permit isn’t required, consulting a professional deck builder is still a wise choice. Factors such as proper materials, structural integrity, and placement are essential to the longevity and safety of your deck.

When a Permit Is Required

If your deck is attached to your house, exceeds the 30-inch height limit, or is built over a basement or story, you’ll need to get a permit from your local building authority. In Tacoma, the Planning and Development Services department oversees deck permits, and working with them ensures your project follows local zoning and safety codes.

—

Building a deck without a permit is possible in Tacoma if it’s detached, not more than 30 inches above ground, and not built over a basement or story. However, for any deck that exceeds these limits or is attached to your home, permits are necessary. At Northwest Decks, we specialize in building custom decks that comply with all local codes, ensuring safety and quality. Reach out to us if you’re planning a project, and we can help you navigate the permit process or build a beautiful, code-compliant deck.