Seattle Building Permits: Timeline, Cost & What Slows You Down
You've got a project mapped out. Maybe it's a kitchen remodel, an addition, or a new ADU in the backyard. What you don't have is any real sense of whether permitting means six weeks or six months. Ask five people and you'll get five different answers, most starting with "it depends." The Seattle building permit process runs on published targets and measured performance data, and we've pulled both straight from SDCI so you can plan against reality instead of a guess.
SDCI's target for simple and medium residential permits (the Full track) is 2 business days to 4 weeks, and 8 to 12 weeks for complex projects. But SDCI's own Construction Permit Performance dashboard shows the total time applicants actually experience runs roughly double the days SDCI spends in active review.
Fees are based on project valuation. As an illustrative example, SDCI's own 2026 fee schedule shows a single-family house permit running about $6,853; a large multifamily project can run well into six figures.
Seattle Building Permit Requirements: Do You Even Need One?
You generally need a permit for anything structural, anything that changes the building envelope (walls, roof, foundation), a use change, grading work, or work on a site in an environmentally critical area (ECA). If your project touches load-bearing framing, moves plumbing or electrical in a way that changes the system, or adds square footage, assume a permit applies.
On the exempt side, SDCI's Do You Need a Permit? page sets real, current thresholds rather than a vague "small" or "minor": minor repairs or alterations costing $6,000 or less in any six-month period don't need one, as long as the work skips load-bearing supports, the building envelope, and anything that reduces egress, light, ventilation, or fire resistance. Detached accessory buildings with a roof area under 120 square feet on a slab foundation, fences under 8 feet, and decks under 18 inches above grade are also exempt. Roof sheathing repair or replacement is exempt too, provided the envelope isn't changing.
One item that's easy to miss when budgeting: electrical, plumbing, and mechanical work each require their own separate trade permit applications, filed and reviewed on their own timeline, not bundled into your construction permit.
Seattle Building Permit Process, in Five Stages
1. Pre-application and the site visit (PASV)
SDCI requires a Pre-Application Site Visit only for specific triggers: new construction, grading, land use/MUP applications, any ground disturbance on an ECA site, or non-ECA projects disturbing more than 750 square feet. SDCI's goal for the PASV report is 5 business days; new construction and MUP applications also get a Preliminary Assessment Report (PAR), an interdepartmental review with SDOT, Seattle Public Utilities, and Seattle City Light, targeted at 10 business days.
2. Booking your intake appointment, and what to have ready
Your Seattle building permit checklist for intake typically includes: a site plan, a complete legal description of the site, structural drawings for any structural scope, energy code compliance documentation, and (for new construction, grading, or ECA sites) a topographic survey and geotechnical report, unless waived. If a Street Improvement Plan applies, a 60-percent-complete version is due to SDOT five days before your SDCI intake date. Submit early and SDCI's Intake Express Lane can move your slot up; miss or fail intake and you're back in the general queue.
3. Plan review and correction cycles
SDCI reviewers check your drawings against code. For new multifamily and commercial construction specifically, SDCI recommends budgeting 4 weeks per correction cycle, with an average of two cycles. Better-prepared sets typically need fewer rounds.
4. Fees, approval and issuance
Roughly 75 percent of your fee is due at intake, with the remaining 25 percent due before SDCI issues the permit.
5. Inspections through to certificate of occupancy
Construction proceeds under scheduled inspections. Single-family projects typically end with a final approved inspection; projects with a use or occupancy change need a certificate of occupancy.
How Long Does It Take to Get a Building Permit in Seattle?
Per SDCI's own Help Center, the Full track (simple projects) targets 2 business days, Full+ (medium complexity, or anything routed to other departments) targets 2 to 4 weeks, and Full Complex, sometimes called Full C, covers most new construction, all MUPs, and larger alterations, targeted at 8 to 12 weeks. Very small projects may qualify for a subject-to-field-inspection (STFI) permit instead, sometimes issued the same day.
Those are the Help Center's track targets. SDCI's separate performance dashboard runs on a different measurement system: day-count goals by project category, plus a 75th percentile figure (the point 3 out of 4 permits beat), and it states plainly that total applicant-experienced time runs roughly double the days in city control. The table below uses this dashboard system, not the track targets above, so the numbers won't match one-to-one; they're measuring the same permit process two different ways. Here's the published goal against current performance, with what that multiplier implies for intake-to-issuance time once you account for correction cycles and response time on your end:
Figures as of [confirm current date with SDCI dashboard before publish]
| Project Category | Goal (City Control) | Current 75th Percentile (City Control) | Roughly What Applicants Experience, Intake to Issuance |
|---|---|---|---|
| Single Family Addition/Alteration | 30 days | 64 days | ~4 months |
| Middle Housing (includes ADUs, duplexes, small-form housing) | 60 days | 117 days | ~7.5 months |
| Pre-Approved DADU Plans | 30 days | 60 days | ~4 months typical (dashboard 75th percentile). SDCI's separate ADU program page states 2 to 6 weeks is achievable on sites without protected trees or ECA issues — that's a best-case figure for a clean site, not a contradiction of the typical-case number to its left. |
| Commercial Addition/Alteration | 30 days | 58 days | ~4 months |
| Large Multifamily (7+ units) | 180 days | 374 days | ~25 months |
This table covers intake to issuance only, not the design and drawing time before you submit, or construction and inspections after issuance.
Seattle Building Permit Fees
Fees run off your project's valuation, not square footage. A high-end finish on a small space can cost more to permit than a larger, simpler build, this is the opposite of what most people assume. As covered in Stage 4 above, you'll pay roughly 75 percent at intake and 25 percent before issuance; here's what that split looks like in dollars, using SDCI's own illustrative 2026 examples:
Amounts below are illustrative examples from SDCI's published fee schedule, not quotes — your actual fee depends on your project's specific valuation.
| Project | Project Valuation | 2026 Plan Review + Permit Fee | Due at Intake (75%) | Due at Issuance (25%) |
|---|---|---|---|---|
| 500 sq ft DADU | $93,145 | $3,453 | $2,590 | $863 |
| 1,500 sq ft single-family house with garage | $308,307 | $6,853 | $5,140 | $1,713 |
| 6,000 sq ft, 4-unit townhouse | $1,117,740 | $18,311 | $13,733 | $4,578 |
What those figures don't include: land use or Master Use Permit review, billed separately at $551 per hour in 2026 (nearly double SDCI's general $292 hourly rate), with a minimum review fee due at intake; hourly drainage and geotechnical review, billed at the $292 general rate; a 5 percent technology surcharge applied to fees; and trade permits for electrical, plumbing, and mechanical work, which are separate applications usually pulled by your subcontractors. Washington State also adds a small building code surcharge to every permit under RCW 19.27.085, remitted to the state; the amount adjusts periodically, so confirm the current figure with SDCI at intake.
What Actually Slows You Down (And How to Avoid It)
Environmentally critical areas (ECAs)
Steep slopes, landslide-prone soil, liquefaction zones, shoreline, and wetlands trigger a prerequisite exemption or relief process before your construction permit can move, and they're a genuine PASV trigger on their own regardless of disturbance size. Check the city's GIS parcel data before finalizing the design, not after.
Large multifamily and land use complexity
The gap between the goal and reality is starkest here: large multifamily's 180-day goal versus a 374-day 75th percentile, more than double, is the single biggest number on SDCI's own dashboard. If your project needs a Master Use Permit, that land use review runs at $551 an hour and largely happens before your construction permit is even in the queue.
Correction cycles
As noted in Stage 3, each cycle adds real time, and this is the biggest variable you actually control. On a set we submitted last year, drainage detailing that hadn't been addressed in the original drawings added nearly six weeks to a single correction round, entirely avoidable with a more complete first submittal.
A rejected or missed intake appointment
Miss your slot or fail the completeness screen and you're back in the general appointment queue, which can run weeks to months out depending on demand. SDCI's Intake Express Lane exists specifically to counter this: submit your complete application before your scheduled date and the system typically pulls you into an earlier opening within 2 to 3 weeks, rather than waiting on your original slot.
Quiet additional reviews
Tree, drainage, and energy code reviews each add a separate reviewer to your file. As of [confirm date before publish], SDCI's own dashboard lists Energy/Mechanical review as the citywide bottleneck, with Zoning close behind, since dashboard rankings shift. Any scope touching the building envelope, HVAC, or water heating triggers energy code review; any added or replaced hard surface can trigger drainage review; work near or removing a tree can trigger a tree reviewer.
The one lever you control across all of this is the completeness of your first submission.
How to Check Your Seattle Building Permit Status
Use the Seattle Services Portal to search by address, permit record number, or parcel ID. It shows current status, where the application sits in review, inspection results, and approved documents once issued. It's also useful for checking a property's permit history before buying.
Conclusion
Permitting time in Seattle is bought during preparation, not won during review. A complete first submittal, an early ECA check, and knowing which review track your project falls into will do more for your timeline than anything negotiated once your application is in the queue. If you want a specific read on your permit path, your ECA exposure, and your project's realistic timeline before design begins, that's worth a conversation early. SDCI's rules, fees, and published targets change periodically, so confirm current figures directly with SDCI before finalizing your budget.
Frequently Asked Questions
-
Most SDCI construction, demolition, mechanical, and grading permits are valid for 18 months from the issue date. You can apply for a renewal within the 30 days before expiration, and permits lapsed less than a year can often be reestablished.
-
Unpermitted work can trigger a stop-work order, fines, and a requirement to open up finished walls or floors for retroactive inspection. It also complicates resale, since inspectors and lenders regularly flag unpermitted work, which can delay or derail a sale years late
-
Yes. SDCI allows homeowners to apply for and hold their own permits, and a contractor can be assigned later. For some trade work, owners may do the work themselves only if they own and occupy the property; otherwise a licensed contractor must pull those specific trade permits.
-
Generally yes, though many qualify for the faster subject-to-field-inspection (STFI) process rather than full plan review. Roof sheathing repair is exempt if the building envelope isn't changing. Check SDCI's current threshold before starting.
