Deck Permits on the Eastside Explained
A deck permit is a check, before you build, that the three parts that cause deck failures are right: the footings, the connection to the house and the guards. Eastside cities and Seattle follow the residential code Washington adopts statewide, with local additions for trees, slopes, shorelines and lot coverage. This guide explains when a permit is needed, what the city reviews, what you submit and how the process runs.
When a deck needs a permit
The common triggers across the cities we work in:
- Any part of the deck surface more than 30 inches above the grade beneath it.
- Any roof, solid or clear, attached or freestanding.
- A hot tub on the deck.
- In some cities, any deck attached to the house regardless of height.
- Any work in a critical area, shoreline zone or protected tree zone, even if the deck itself is exempt.
Low, freestanding decks under the height limit, small open pergolas and ground-level patios often need no building permit, though large new hard surfaces can trigger stormwater review. The Deck Permit Checker applies these rules by city.
What the city reviews
Footings.
Size, depth below the frost line, and spacing for the loads the posts carry.
Ledger.
How the deck attaches to the house: fastener type and spacing, flashing, and whether the house rim can carry the load. Ledger failures are the leading cause of deck collapses, and reviewers look closely here.
Lateral resistance.
On elevated decks, connections that keep the deck from pulling away from the house or racking sideways.
Framing.
Joist and beam sizes and spans for the deck's loads.
Guards and stairs.
Guard height, opening size and post strength; stair rise, run, handrails and landings.
Roofs.
Snow and wind loads, post and beam sizes, and the connection to the house or to footings.
Site.
Setbacks from property lines, lot coverage, impervious surface, trees, slopes, shoreline.
What goes in the submittal
- Site plan with property lines, the house, the deck footprint and distances to lines.
- Framing plan showing joists, beams, posts and footings with sizes and spacing.
- Elevation or section showing heights, guards and stairs.
- Ledger and footing details.
- Roof framing for covered structures.
- Engineering for elevated decks on slopes, large roofs or unusual spans, where required.
- Tree, critical area or shoreline documents if the site triggers them.
Most cities accept submittals online through their permit portals.
How review runs
The city checks completeness at intake, then routes the plans to a building reviewer and, where relevant, to planning, critical areas or tree reviewers. Comments come back as a correction letter; revised drawings answer them. When approved, the permit is issued and posted on site.
Simple elevated decks with complete drawings often move through in a few weeks. Covered structures, hillside decks needing geotechnical review, and shoreline or tree reviews take longer, sometimes several months.
Inspections
Typical deck inspections: footings before concrete is poured, framing before decking covers it, and a final inspection after railings and stairs are complete. Covered structures may add a roof framing inspection. A failed inspection is corrected and rescheduled.
HOAs are separate
A homeowners' association can have its own rules on materials, colors, heights and placement. HOA approval does not replace a city permit, and a city permit does not override HOA covenants. Many Eastside projects need both, and running them in parallel saves time.
Why the permit is worth it
A permit costs a small fraction of a deck and buys an independent check of the structure. It also creates a record. When the house is sold, buyers' inspectors and lenders ask about elevated decks, and an unpermitted one can turn into a repair demand or a price reduction. Insurers may ask too, after a claim.
What it costs
Permit fees for decks vary by city and valuation, typically a few hundred to a couple of thousand dollars for residential decks, more for large covered structures. The Deck Cost Calculator includes a permit range for your city.
We prepare and submit the permit with every project that needs one.