Whether you’re buying, selling, or investing in Seattle real estate, permits matter for different reasons depending on which side of the deal you’re on. Here’s what I tell each type of client, plus how unpermitted work factors into it.

For Buyers: What to Check Before You Close

If a listing shows an addition, converted basement, or anything beyond cosmetic work, ask for the permit history before you’re too far into the transaction to walk away easily. An unpermitted addition you inherit becomes your problem the day you close, not the seller’s.

For Sellers: What You’re Required to Disclose

Washington’s seller disclosure form asks directly about known defects and unpermitted work. Sellers who don’t disclose and get caught later can face real legal exposure, well after the sale has closed, so honesty here protects you more than it costs you.

For Investors: Why This Affects Your Numbers

If you’re flipping or holding a rental, unpermitted work you add yourself can come back to bite you at resale, or worse, during a tenant dispute if something fails inspection later. Building permit costs into your renovation budget from day one is cheaper than discovering the gap when you go to sell.

What Typically Requires a Permit

Structural changes
Electrical or plumbing upgrades
Additions and remodels
Roofing and siding replacements

The Short Version of the Process

Submit an application to SDCI or King County with project details and plans, pay the application fee, go through plan review, get the permit, schedule inspections at key stages (foundation, framing, rough-ins), and receive final approval once everything checks out.

What Happens If You Skip It

Legal Penalties: Fines and possible corrective orders from the city or county
Reduced Property Value: Appraisers often can’t count unpermitted square footage
Insurance Issues: Claims tied to unpermitted work can be denied
Safety Concerns: Work that skipped inspection may not actually meet code

How PNW Home Offer Can Help

Whichever side of this you’re on, if unpermitted work is complicating a sale, I buy houses in Seattle and King County as-is. No permits to pull, no corrections to make first, no waiting on inspections. I factor the condition into a fair cash offer.

Applying for the Permit Itself

Once you know a permit is needed, the application generally requires detailed plans or blueprints of the work, a description of project scope, and the application fee upfront. SDCI reviews larger or more complex projects more thoroughly, so a straightforward electrical upgrade moves faster than a full addition. Building that timeline into your plans, whether you’re renovating to sell, renovating to hold, or just fixing something that broke, saves a lot of frustration later.

How Long Permit Review Actually Takes

Simple permits, like a water heater swap or a like-for-like electrical panel replacement, can sometimes get same-day or next-day approval over the counter. Anything more involved, a bathroom remodel, a finished basement, an addition, typically goes through standard plan review, which has run anywhere from a few weeks to two or three months at SDCI depending on current workload and how complete the submitted plans are. Projects that need review from multiple departments, like structural and electrical together, tend to sit longer since each department reviews independently before the permit is issued. If plans get kicked back with corrections, and first submissions often do, add another few weeks for the resubmission cycle.

There is an expedited review option in Seattle for an extra fee, which can cut weeks off the wait if a project is time-sensitive, and some smaller jurisdictions in King County move faster than the city simply because they have a smaller backlog. If permit timing is the bottleneck on getting a house sale-ready, it’s worth calling the permitting office directly and asking what their current turnaround actually is, since published estimates don’t always reflect what’s happening that particular month. That single phone call has saved sellers weeks of guessing.

Call (206) 900-8173 or send us a message if you’d like to talk through your specific situation.