Permit Required? Required
Typical Fee Range $150–$500 Fees are calculated based on the estimated cost of construction plus a technology fee.
Fee Method Valuation-based
Apply Online Apply at Department of Buildings →

What's Required in Washington

  • Structural plans showing footings, joist spacing, and ledger attachments.
  • Plat of Survey showing the deck footprint and distances to property lines.
  • Deck must not exceed 20% lot occupancy if in certain residential zones.
  • Railing height must be a minimum of 36 inches.
  • Stair geometry must meet DC Building Code (Max rise 8.25", Min tread 9").
  • Post-hole depth must reach the 30-inch frost line.

When a Deck Needs a Permit in Washington

Whether a deck needs a building permit in Washington usually comes down to how high and how big it is. Low, ground-level platforms are often exempt, while raised decks need a permit — many cities draw the line at decks more than about 30 inches above grade (where guardrails and footings come into play), but Washington’s exact threshold is set by the Department of Buildings. Attached decks almost always require a permit because they tie into the house’s structure, and even a freestanding deck usually needs one once it passes the size or height cutoff. Check the requirements above before you build, and note that zoning setbacks from property lines apply regardless.

Do You Need a Permit to Repair or Replace a Deck in Washington

It depends on how much you’re changing. Swapping worn decking boards or railing on the same layout is usually treated as maintenance and often doesn’t require a permit in Washington. But replacing the structural framing (joists, beams, posts, or footings), rebuilding the deck, enlarging it, or changing its height generally does — at that point it’s regulated like new construction. When in doubt, describe the scope to the Department of Buildings before starting; the requirements above outline what Washington expects.

How to Get a Deck Permit in Washington

1

Step 1: Site Plan

Draw a site plan showing the deck dimensions and its relation to the house and lot lines.

2

Step 2: Structural Review

Submit detailed construction drawings for a building code compliance review.

3

Step 3: Online Submission

Upload all documents to the Access DC portal for electronic plan review.

4

Step 4: Permit Issuance

Pay final fees and print your permit to be displayed at the job site.

5

Step 5: Footing & Final Inspections

You must have footings inspected before pouring concrete, followed by a final structural inspection.

Frequently Asked Questions

Only if the window is not a required emergency egress for a bedroom.
A permit is not required for a simple concrete or paver patio on grade, but is required for any raised wood deck.
Residential deck reviews typically take 10-15 business days through the standard online portal.
Usually not — swapping decking boards or railing on the same structure is generally considered maintenance in Washington. Replacing the framing (joists, beams, footings), rebuilding, or enlarging the deck typically does require a permit. Check the scope with the Department of Buildings.