Seattle Building Permit Guide for Homeowners: Timeline, Costs and Tips

Navigating Seattle’s building permit process is one of the most common pain points homeowners face. Permit timelines can run 4 to 20+ weeks depending on project type, and the process is more complex than most people expect. This guide explains how Seattle permitting works, what to expect at each stage, and how working with an experienced architect shortens the process.

Seattle Department of Construction and Inspections (SDCI)

All building permits in the City of Seattle are processed through SDCI. Projects in Eastside cities — Kirkland, Bellevue, Redmond — are permitted through their respective city departments. Each jurisdiction has its own review process and timeline.

Types of Seattle Residential Permits

Over-the-Counter (OTC) Permits

Small, straightforward projects meeting pre-approved criteria can receive permits the same day. Examples: replacing windows with same-size openings, like-for-like mechanical replacements, small decks. No architectural drawings required.

Standard Plan Review

Most residential additions and significant remodels go through standard plan review. SDCI assigns the project to a permit specialist who reviews drawings for code compliance. Timeline: 6–10 weeks for initial review. Corrections are common — even well-prepared sets typically receive 1–3 comments requiring response.

Master Use Permit (MUP)

Projects requiring land use review — variances, design review, or SEPA environmental review — must first obtain a MUP before the building permit. MUPs add 3–6 months. Shoreline projects, critical area properties, and projects requiring variances typically need MUPs.

Current Seattle Permit Timelines (2026)

Permit Fees in Seattle

Seattle building permit fees are based on project valuation. A $500,000 addition generates permit fees of approximately $8,000–$14,000. SDCI charges a plan review deposit at application that is applied to the final permit fee at issuance.

How Architecture Firms Speed Up Permitting

An experienced residential architect reduces permitting time by submitting complete, code-compliant drawings that minimize reviewer comments, identifying zoning issues in pre-design, and responding to permit comments quickly with precise corrections. Our design process includes a permitting strategy developed during schematic design.

Eastside Cities: Kirkland, Bellevue, Redmond

If your project is in Kirkland, Bellevue, or Redmond, you permit through those cities. Eastside permit timelines are generally similar to Seattle, though each city has its own land use code. Piper Cole Architects has permitted projects in all Eastside jurisdictions and knows the specific requirements of each.