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What this covers
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Permits are the part of a deck project homeowners most want to avoid and most regret avoiding. The avoidance is understandable: it adds time, cost and an inspection that can go badly. The regret usually arrives years later, at a moment when nothing can be done about it cheaply.
Washington building code derives from the International Residential Code, adopted at state level and administered by cities and counties. That means the thresholds are broadly consistent across the state and the administration is genuinely local, which is why a definitive answer always comes from the jurisdiction rather than from a guide.
The Three Thresholds
Three factors determine whether a permit applies, and size is the least important of them.
Attachment. A deck attached to a dwelling requires a permit in most jurisdictions, essentially regardless of its size. Attachment means the structure is transferring load into the house, and that puts it squarely inside the building department’s remit.
Height above grade. A freestanding deck low to the ground is frequently exempt. Above a threshold height it is not, because falls become a life-safety issue and guardrails become mandatory.
Area. Most jurisdictions exempt very small freestanding platforms. The exemption is narrower than people assume and it evaporates the moment either of the other two thresholds is crossed.
The pattern is that the exemptions are for genuinely minor ground-level platforms. Anything a person could fall from, and anything bolted to a house, is permitted work.
What Each Inspection Looks At
Deck permits typically involve two inspections, and they happen at moments chosen so that the critical work is still visible.
A footing inspection occurs before concrete is poured. The inspector is checking depth, diameter and bearing, because once concrete is in the ground nobody can verify any of it. Footing depth matters for frost and for bearing on undisturbed soil rather than on backfill.
A framing inspection occurs before decking is installed. This is the substantive one. With the boards off, the inspector can see the ledger connection, the flashing, the joist hangers, the beam-to-post connections and the guardrail attachment. Once decking goes down, all of it is hidden.
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Stage |
What is checked |
Why then |
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Footing |
Depth, diameter, bearing soil |
Invisible after the pour |
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Framing |
Ledger, flashing, hangers, posts, guard attachment |
Invisible after decking |
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Final |
Guardrail height and spacing, stairs, handrail |
Complete assembly |
The ordering is the useful insight. Inspections are scheduled around the moments where verification is still physically possible, which is also why an inspector will require decking to be removed if it went down before the framing inspection happened.
Why Unpermitted Decks Surface at Sale
An unpermitted deck usually causes no trouble at all while the owner lives there. An unpermitted structure appears during a title search, or during the appraisal and disclosure process when the property is sold.
At that point the options are all worse than the original permit would have been.
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Disclose and discount. The buyer takes on the problem and prices it in.
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Retroactively permit. The jurisdiction will usually allow it, but the structure has to be made inspectable, which can mean removing decking or excavating to expose footings.
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Remove it. Occasionally the cheapest of the three.
There is also an insurance dimension. A claim arising from a structure that was never permitted invites questions that a permitted structure does not, and while outcomes vary, the position is straightforwardly worse.
The arithmetic that makes permitting worthwhile is not the fee. It is that a permit converts a permanent unresolved liability into a closed file.
Shoreline Jurisdiction Runs in Parallel
Medina lies on the eastern shore of Lake Washington, and properties on or near a shoreline sit under an additional layer of regulation that a lot of homeowners discover late.
Shoreline jurisdiction is administered separately from building permits. It is a different review, with different criteria, concerned with the water rather than the structure: setbacks from the ordinary high water mark, vegetation and habitat, impervious surface, and in some cases view corridors.
Two practical consequences follow.
The first is timing. Shoreline review typically runs longer than building permit review, and it can run considerably longer if the proposal requires a variance. A project scoped for a spring build needs the shoreline application in well before the building application would have been necessary.
The second is design. Shoreline criteria can change what is buildable, not merely when. A deck footprint that is unremarkable inland may exceed impervious surface limits or intrude on a required buffer near the water, and the time to discover that is at concept rather than after drawings are complete.
For waterfront and near-water properties, deck builders serving Medina work to both sets of requirements at once, and confirming the service area is a sensible first step before drawings begin.
The Sequencing That Avoids a Torn-Open Deck
The single most expensive permitting mistake is not skipping the permit. It is applying for one and then building ahead of the inspections.
The sequence that works is unremarkable and gets compressed under schedule pressure.
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Application and review before any excavation.
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Dig footings, then stop. Call for the footing inspection before pouring.
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Pour, frame, then stop. Call for the framing inspection before any decking goes down.
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Deck, rail, stair, then final.
Each stop is short, and each one exists because the alternative is undoing finished work. Crews under pressure to finish a deck before a weekend will occasionally lay boards while waiting on an inspector, and the cost of that decision is removing them again.
The related point is that inspections are scheduled, not instant. Building an inspection lead time into the program is the difference between a two-day pause and a crew standing idle.
What About Repairs
Repair work sits in a genuinely gray area and the honest answer is that it depends on scope.
Replacing decking boards on sound framing is maintenance almost everywhere. Replacing joists, a beam, posts or the ledger is structural work and generally requires a permit, because the elements being replaced are the ones the inspection exists to verify.
The line most jurisdictions draw is between replacing a surface and replacing structure. A project that began as board replacement and turned into joist replacement when the rot was uncovered has crossed that line, and the moment to make a call is when the rot is found rather than after the new framing is closed in.
What the Permit Actually Costs
Homeowners avoid permits on a cost assumption that is usually wrong, because the fee is the smallest part of the comparison.
|
Item |
Permitted |
Unpermitted |
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Permit fee |
Modest, one-off |
None |
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Schedule impact |
Review plus inspection lead times |
None |
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Independent verification of structure |
Included, free |
None |
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Position at resale |
Closed file |
Disclosure, discount or remediation |
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Insurance position after a claim |
Straightforward |
Open to question |
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Retroactive permitting later |
Not needed |
Excavation or demolition to expose work |
The row that changes most minds is the middle one. A permit buys a qualified third party inspecting the ledger, the flashing, the hangers and the footings, at a moment when they are still visible, and reporting to somebody other than the contractor.
That is genuinely useful oversight on the most consequential details of the build, and no homeowner is in a position to perform it themselves. Framed that way, the fee purchases something rather than merely permitting something.
What the Standard Advice Misses
Most published permit guidance leads with square footage, because a number is easy to write down. Attachment and height trigger permits far more often than area does, and a homeowner who has memorized an area threshold will confidently reach the wrong conclusion about a small deck bolted to the house.
The second omission is that permit requirements are administered locally even where the code is adopted at state level. Two adjacent cities can differ on exemptions, on submittal requirements and on review times. A guide that gives one answer for the state is describing the code rather than the process.
The third is the parallel-jurisdiction problem. Shoreline, critical areas, and homeowner association review can each apply independently of the building permit, and each has its own timeline. A project that treats the building permit as the only approval is a project that will discover the others in sequence rather than in parallel, which is how a spring build becomes an autumn one.
The Summary
Attachment to the house and height above grade trigger a deck permit far more often than area does, and anything bolted to a dwelling is permitted work almost everywhere.
Inspections are timed to the moments when the critical work is still visible: footings before the pour, framing before the decking. Building past either one means undoing finished work.
Unpermitted decks are quiet until the property sells, at which point every available option costs more than the permit would have. And near a shoreline, a second review runs in parallel on its own timeline, with criteria that can change what is buildable rather than only when.
