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🪵 Deck / Porch permit in Washington

An attached or freestanding outdoor platform, usually wood or composite, elevated above grade or at grade level. Here is the Washington-specific rule: who issues it, typical fees, timeline, go / no-go, and the official source to verify.

Deck / Porch permit in Washington

The Washington rule for a deck / porch, with fee range, timeline, go / no-go, and the official source.

State

Washington

Project

🪵 Deck / Porch

Exact permit fees are set by the local building department. WikEst shows the published or code-based range where one exists, linked to its official source — verify the final amount at the source before budgeting.

🪵 Deck / Porch permit fee in Washington

ConditionalGenerally allowedcity authority

Permit fee range

Valuation-based; fee set by the issuing city.

Typical timeline

Simple decks may be Subject-to-Field-Inspection; standard review 4–8 weeks.

Setback

Per zoning; in Seattle decks >36 in above grade count toward lot coverage.

Exempt if

Freestanding decks ≤30 in above grade and ≤200 sq ft are commonly exempt.

Exempt criteria: Freestanding deck ≤30 in above adjacent grade and ≤200 sq ft generally exempt from a building permit (IRC R105.2; Seattle Tip 202; Spokane ≤30 in).

Attached decks and decks over 30 in above grade always require a permit.

Official sources: Seattle SDCI — Common Projects (Decks) · City of Spokane — Residential Building Review

Representative cities for Washington: Seattle, Spokane.

All 20 project fee ranges in Washington

Official-source ranges where published; “By local jurisdiction” means no flat fee is published and the amount is set case by case.

Project	Permit?	Authority	Fee range	Go / no-go
🏠 Accessory Dwelling Unit (ADU)	yes	city	Valuation-based; Seattle SDCI issue fees scale with project value (no flat state fee).	allowed
🪵 Deck / Porch	conditional	city	Valuation-based; fee set by the issuing city.	allowed
🧱 Fence / Wall	conditional	city	Often no building-permit fee when under the height threshold; zoning rules still apply.	allowed
🛖 Shed / Outbuilding	conditional	city	Valuation-based when a permit is required; many small sheds are exempt.	allowed
🪜 Basement Finish	yes	city	Valuation-based; includes trade permits (electrical, plumbing).	allowed
🚗 Garage / Carport	yes	city	Valuation-based; includes trade permits.	allowed
☀️ Rooftop Solar PV	yes	city	Building + electrical permits; Seattle combined fees typically a few hundred dollars.	allowed
🌡️ HVAC Replacement	yes	city	Mechanical (trade) permit; fee set by city.	allowed
🍳 Kitchen Remodel	conditional	city	Valuation-based when structural/plumbing/electrical work is included.	allowed
🛁 Bathroom Remodel	conditional	city	Valuation-based when plumbing is relocated.	allowed
🏗️ Room Addition	yes	city	Valuation-based; includes trade permits.	allowed
🪟 Window / Door Replacement	conditional	city	Usually no fee for in-kind swap; permit needed if opening is enlarged.	allowed
🏘️ Roof Replacement	conditional	city	Often Subject-to-Field-Inspection or exempt for same-footprint re-roof.	allowed
🅿️ Driveway / Parking Pad	conditional	city	Building permit often not required; curb-cut/right-of-way work is separate.	allowed
🏊 Swimming Pool / Spa	yes	city	Valuation-based; includes barrier/fencing review.	allowed
🧱 Retaining Wall	conditional	city	Valuation-based when over the height threshold.	allowed
💥 Demolition / Teardown	yes	city	Demolition permit fee set by the city; verify locally.	allowed
🚰 Septic System	yes	county	Onsite sewage permit fee set by the local health jurisdiction; verify locally.	allowed
🔌 EV Charger	conditional	city	Electrical permit fee set by the city; verify locally.	allowed
⚡ Standby Generator	yes	city	Electrical (and often mechanical/gas) permit fee set by the city; verify locally.	allowed

Washington rule at a glance

Needs permit

conditional

Issuing authority

city

Typical fee

Valuation-based; fee set by the issuing city.

Typical timeline

Simple decks may be Subject-to-Field-Inspection; standard review 4–8 weeks.

Setback

Per zoning; in Seattle decks >36 in above grade count toward lot coverage.

Exempt if

Freestanding decks ≤30 in above grade and ≤200 sq ft are commonly exempt.

Attached decks and decks over 30 in above grade always require a permit.

Official sources for this rule: Seattle SDCI — Common Projects (Decks) · City of Spokane — Residential Building Review

Frequently asked questions

Does a deck / porch need a permit in Washington?

In Washington, a deck / porch is conditional / size-dependent. Issuance is at the city level. Confirm the exact threshold with the local building department using the sources on this page.

Who issues the deck / porch permit in Washington?

Washington permits for this project are handled at the city level — usually the city or county building department. Use the county permit authority lookup to find the exact office for your property.

How much does a deck / porch permit cost in Washington?

Fees are set locally in Washington and are not a single statewide number. Open the official authority link on this page for the current schedule.

What exemptions apply to a deck / porch in Washington?

A common threshold: Freestanding decks ≤30 in above grade and ≤200 sq ft are commonly exempt.. Freestanding deck ≤30 in above adjacent grade and ≤200 sq ft generally exempt from a building permit (IRC R105.2; Seattle Tip 202; Spokane ≤30 in). City or county amendments may apply — verify locally.

🗺️ All projects in Washington

The full Washington permit guide across 20 home projects.

📊 Deck / Porch in every state

Compare the deck / porch rule across all U.S. states.

Deck / Porch in other states

State	Permit?	Authority	Typical fee	Timeline	Go / No-Go	Key notes
California	Conditional	city	Set by the city — typically a flat fee plus a valuation-based fee. Verify with the city building department.	Same-day Over-the-Counter for low decks (SF); 2–4 weeks elsewhere.	Generally allowed	Attached decks and any deck over 30 in above grade need a permit. SF issues Over-the-Counter permits for decks less than 10 ft above grade that meet setbacks. Exempt: Decks over 30 in (760 mm) above grade require a permit; lower decks are often exempt.
Texas	Conditional	city	Set by the city — typically a flat plus valuation-based fee. Verify with the city building department.	1–4 weeks.	Generally allowed	Attached decks or decks over 30 in above grade require a building permit. Exempt: Decks ≤30 in above grade are exempt (Houston IBC 105.2; Dallas same).
Florida	Conditional	city	Set by the city — typically a flat plus valuation-based fee. Verify with the city building department.	1–4 weeks.	Generally allowed	Attached or raised decks need a building permit. Exempt: Decks >30 in above grade or attached require a permit (FBC R105).
New York	Conditional	city	Set by the city — typically a flat plus valuation-based fee. Verify with the city building department.	1–4 weeks (NYC files through DOB NOW).	Generally allowed	Attached or raised decks need a permit; NYC requires a DOB filing. Exempt: Decks >30 in above grade require a permit (RCNYS R105).
Pennsylvania	Permit required	city	Municipal permit fee; Philadelphia EZ Permit available for eligible decks.	Philadelphia EZ Permits reviewed while you wait; standard permits ~15 business days.	Generally allowed	Attached decks and any deck more than 30 in above grade need a permit. Philadelphia offers an EZ Permit for residential decks up to 216 sq ft.
Illinois	Permit required	city	Chicago fees via online calculator; other municipalities set their own.	—	Generally allowed	Decks and porches require a permit (Chicago requires permits for decks/porches). Chicago offers an Express Permit for eligible deck work; most other IL towns follow IRC R105.
Ohio	Permit required	city	Columbus minimum permit fee $125; total scales with valuation.	Residential permits ~10 business days (Columbus BZS).	Generally allowed	Decks require a permit (Columbus lists deck/ramp permits). Attached decks and any deck more than 30 in above grade always require one.
Georgia	Permit required	city	Atlanta minimum permit cost $150 plus $25 technology fee; total scales with construction cost.	—	Generally allowed	Deck/patio additions require a permit (Atlanta lists deck/patio addition). Attached decks and decks over 30 in above grade always require one.
North Carolina	Permit required	city	Valuation-based building permit fee; Raleigh uses its Development Fee Guide / calculator. No flat statewide figure.	Plan review commonly 1–3 weeks; Mecklenburg targets ~7 business days for 1–2 family decks.	Generally allowed	Charlotte (Mecklenburg) and Raleigh both require a building permit for any deck/porch regardless of size or height. Footings must reach 12 in below grade; guards required at 30 in+. Exempt: State IRC R105.2 exempts only freestanding decks ≤200 sq ft, ≤30 in above grade, not serving egress — but Charlotte and Raleigh require a permit for ALL decks.
Michigan	Conditional	city	Valuation-based building permit; verify with the city.	Typically 5–15 business days; Detroit ~5 days.	Generally allowed	Footings must extend below the frost line — 42 in in the Detroit/Grand Rapids area. Guards required at 30 in+ above grade. Verify setback and lot coverage with the city. Exempt: State R105.2 exempts decks ≤200 sq ft, ≤30 in above grade, not attached, not within 36 in of the dwelling, and not serving egress.
New Jersey	Permit required	city	Construction permit based on valuation; plan review fee applies. Verify with the city.	Plan review commonly up to 20 business days; simple permits may be issued sooner.	Generally allowed	New decks require a UCC construction permit and zoning approval; plans by a NJ-licensed design professional are typically required. Newark footings are ~36 in. Repairs to existing decks are exempt if non-structural. Exempt: Newark requires a permit for attached or detached decks over 30 in high; Jersey City requires a permit for any new deck.
Virginia	Permit required	city	Building permit based on valuation plus a 2% state levy; verify with the city.	Virginia Beach initial online review targets 3 business days; typical issuance 10–15 business days.	Generally allowed	A building permit is required for new decks (Virginia Beach requires it for every deck, no size/height exemption). Inspections: footing, framing, final. Footings ~18 in in coastal Virginia. Exempt: Prince William: decks with floor ≥16.5 in above grade require a permit. Virginia Beach requires a permit for ALL decks regardless of size/height.
Arizona	Conditional	city	Valuation-based; Phoenix base building-permit fee is $150.	Over-the-counter or 1–3 weeks depending on complexity.	Generally allowed	Attached decks with a structural ledger connection should be verified with the building department. Exempt: Decks ≤30 in above grade (and not over a basement) are exempt.
Massachusetts	Conditional	city	Valuation-based; each city sets its own schedule.	Worcester: ~3–4 weeks; Boston: short-form fast, long-form several weeks.	Generally allowed	A licensed Construction Supervisor (CSL) is required unless the owner does the work on an owner-occupied home. Exempt: Decks ≤200 sq ft, ≤30 in above grade, not attached, not serving a required exit are exempt.
Tennessee	Conditional	city	Valuation-based; set by the issuing city/county.	Memphis OCCE ~5–10 business days for standard decks.	Generally allowed	Footing depth follows local frost line (shallow in Memphis, ~12 in Middle TN). Exempt: Decks ≤200 sq ft, ≤30 in above grade, not attached, not serving a required exit are exempt.
Indiana	Conditional	city	Set by the local building department.	—	Generally allowed	Attached decks and any deck over 30 in above grade need a permit. Indianapolis requires a structural permit for deck work. Exempt: Decks more than 30 in above grade generally require a building permit under the Indiana Residential Code (IRC R105.2).
Missouri	Conditional	city	Permit fees set locally by each municipality — verify with the city building department.	Varies by municipality — over-the-counter/simple permits often same-day to ~2 weeks.	Generally allowed	Kansas City adopted the 2018 IRC (effective 2020); St. Louis enforces the I-Codes locally. Exact thresholds follow local amendments — verify with your city. Exempt: Freestanding decks low to grade and not attached are generally exempt under the locally adopted IRC R105.2; attached decks and decks over 30 in require a permit.
Maryland	Conditional	city	Set by the city.	—	Generally allowed	Attached decks and decks over 30 in above grade need a permit. Annapolis publishes deck construction requirements. Exempt: Decks over 30 in above grade generally require a building permit under the IRC (adopted in MD as MBPS).
Wisconsin	Conditional	city	Permit fees set by each municipality — verify with the local building inspection department.	Varies by municipality — over-the-counter/simple permits often same-day to ~2 weeks.	Generally allowed	Milwaukee and Madison require a permit for decks attached to the dwelling or over 30 in above grade; footings are inspected for frost depth. Exempt: Freestanding decks low to grade and not attached are generally exempt under the UDC; attached decks and decks over 30 in require a permit.
Alaska	Conditional	city	Valuation-based; set by the municipality.	Anchorage initial plan review ~1–3 days; full review longer for complex decks.	Generally allowed	Frost-depth footings are required for every deck — Fairbanks frost depth commonly reaches 60+ in and Anchorage ~40–60 in. Footing inspections occur before concrete is poured. Exempt: Anchorage requires a permit for decks more than 30 in above grade and within 3 ft of grade.
Alabama	Conditional	city	Valuation-based; set by the issuing city.	Birmingham residential plan review typically 5–10 business days.	Generally allowed	Birmingham adopts the IBC/IRC with Alabama amendments. Deck footings commonly bottom out at the ~12 in frost depth, but expansive Black Belt clay in central Birmingham often requires deeper footings and a geotechnical report. Exempt: Decks ≤30 in above adjacent grade are typically exempt (IRC R105.2).
Arkansas	Conditional	city	Valuation-based; Little Rock minimum building-permit fee $50 (work over $5,000 or requiring inspection).	Little Rock residential plan review typically 5–15 business days.	Generally allowed	Ledger-board attachment is a key inspection point; Arkansas frost line is a mild 12–18 in. Exempt: Decks >30 in above grade or >200 sq ft require a permit (IRC + local); ground-level decks below both are generally exempt.
Colorado	Conditional	city	Valuation-based; set by the issuing city/county.	—	Generally allowed	Some cities also require a permit for any deck attached to the house because of the structural connection. Mountain/WUI communities may require fire-resistant decking. Exempt: Most Colorado cities require a permit for decks >30 in above grade or >200 sq ft; ground-level decks below both are generally exempt. Denver and Colorado Springs follow IRC thresholds.
Connecticut	Conditional	city	Valuation-based; set by the city/town.	—	Generally allowed	Ledger-board attachment is a key inspection point. Exempt: Decks >30 in above grade require a permit (IRC R105.2); attached or higher decks require a permit.
Delaware	Conditional	county	Valuation-based; set by the county or city.	—	Generally allowed	Ledger-board attachment is a key inspection point. Exempt: Decks >30 in above grade require a permit (IRC); attached or higher decks require a permit (Kent County follows the 2018 IRC).
Hawaii	Conditional	county	Valuation-based; set by the county building department.	Plan review for permitted decks; over-the-counter for simple low platforms where exempt.	Generally allowed	All structural lumber above ground must be preservative-treated for Formosan termite resistance per Hawaii’s amended code; wind-load design (105–170 mph gusts by location) applies. Verify with the county building department. Exempt: Platforms, walks, and driveways not more than 30 in above grade and not over a basement are exempt.
Iowa	Conditional	city	Valuation-based; set by the issuing city.	Over-the-counter to a few weeks depending on complexity.	Generally allowed	Attached decks and any deck above 30 in require a permit and footings below the local frost line (36-42 in across Iowa). Exempt: Freestanding decks 30 in or less above adjacent grade are typically exempt.
Idaho	Conditional	city	Valuation-based; set by the issuing city.	Over-the-counter or plan review depending on complexity.	Generally allowed	Attached decks with a structural ledger connection should be verified with the building department; mountain areas require local snow-load design. Exempt: Decks ≤30 in above grade (not serving as an exit) are exempt under the Idaho Residential Code.
Kansas	Conditional	city	Valuation-based; set by the issuing city.	Wichita 5-10 business days typical.	Generally allowed	Footings must extend below the local frost line (24-36 in across Kansas). Exempt: Overland Park requires a permit for all new/replacement decks; Wichita requires a permit for decks over 30 in above grade.
Kentucky	Conditional	city	Valuation-based; set by the issuing city.	Lexington simple decks can be approved same-day if filed before 4 p.m.	Generally allowed	Attached decks and any deck above 30 in require a permit; footings below the local frost line (about 24 in in Lexington). Exempt: Freestanding decks 30 in or less above grade are typically exempt under the KRC (2015 IRC).
Louisiana	Conditional	city	Valuation-based; set by the issuing parish/city.	NOLA residential renovation permits 2-5 business days.	Generally allowed	Attached or elevated decks require a permit and wind/hurricane detailing. Exempt: NOLA exempts uncovered decks <=200 sq ft and <=30 in high, not attached, not serving as an exit.
Maine	Conditional	city	Valuation-based; set by the issuing municipality (no statewide flat fee).	1–4 weeks for plan review; simple exempt work is over-the-counter.	Generally allowed	Maine uses a 200 sq ft deck exemption (higher than the base IRC 120 sq ft). Footings must reach the local frost depth (commonly 48–60 in). Attached decks need a permit even if small — confirm with the Code Enforcement Officer. Exempt: Freestanding decks ≤200 sq ft and ≤30 in above grade are exempt.
Minnesota	Conditional	city	Permit fees set by the municipality; verify locally.	Varies by municipality — simple decks often same-day to a few weeks.	Generally allowed	Minnesota has deep frost depths (roughly 42 in across the Twin Cities) — deck footings must extend below the local frost line. Verify with Minneapolis Development Review or Saint Paul DSI. Exempt: Freestanding decks low to grade and not attached are generally exempt; attached decks and decks over 30 in above grade require a permit.
Mississippi	Conditional	city	Where enforced, fees follow the local schedule (e.g., Jackson scales with valuation). Verify locally.	Varies by jurisdiction.	Generally allowed	If your jurisdiction does not enforce a building code, no structural permit is required. The six coastal counties must enforce coastal wind/flood provisions. Exempt: Where a code is enforced (e.g., Jackson adopts the 2018 IRC), a freestanding deck not over 30 in above grade and under ~200 sq ft is typically exempt.
Montana	Conditional	city	Where enforced, fees follow the local schedule; verify locally.	Where enforced, simple decks often over-the-counter to a few weeks.	Generally allowed	In certified cities a permit is required for elevated or attached decks. In non-certified areas, single-family homes are exempt from the state building permit. State trade permits still apply. Exempt: Freestanding decks not over 30 in above grade are typically exempt (2021 IRC R105.2). Billings requires a permit for decks over 30 in above grade.
North Dakota	Conditional	city	—	—	Generally allowed	Footings must extend below ND frost depth (commonly 48–60 in depending on region). Ledger flashing and guardrail details are reviewed. Check with your local building department. Exempt: State code (IRC R105.2) exempts decks ≤200 sq ft, ≤30 in above grade, not attached, not serving the exit door.
Nebraska	Conditional	city	Permit fees set by the municipality; verify locally.	Varies by municipality — simple decks often same-day to a few weeks.	Generally allowed	Nebraska adopts the 2018 IRC (R313 sprinklers and chapters 25-33 mechanical/plumbing replaced by state codes). Deep frost depths (about 42 in in Omaha/Lincoln) set footing requirements. Verify locally. Exempt: Freestanding decks low to grade and not attached are generally exempt; Omaha permits decks over 30 sq ft or more than 30 in above grade, and Lincoln requires a permit for all decks.
New Hampshire	Conditional	city	—	—	Generally allowed	New Hampshire footings must extend to frost depth (commonly 48 in). Even exempt low decks must meet zoning setbacks. Verify the threshold with your local building department — some towns permit any attached deck. Exempt: Decks ≤30 in above adjacent grade and (in most towns) ≤200 sq ft are exempt from a building permit.
New Mexico	Conditional	city	—	—	Generally allowed	Setbacks and lot-coverage limits still apply. In LEAs like Albuquerque, plan review typically takes 10–15 business days; Santa Fe historic-district properties need additional design review. Exempt: Decks ≤200 sq ft, ≤30 in above grade, not attached to the dwelling, and not serving the required exit door are exempt.
Nevada	Conditional	city	Valuation-based; Reno offers flat-rate EZ permits for simple decks. Clark County fees scale with valuation.	Over-the-counter/EZ for simple decks; plan review for attached or elevated decks.	Generally allowed	Attached decks with a structural ledger connection and any deck above 30 in require a permit and footing inspections (frost depth matters in Washoe County). Exempt: Decks ≤30 in above adjacent grade (not over a basement) are exempt from a building permit per IRC R105.2 / Clark County exemption.
Oklahoma	Permit required	city	Valuation-based; OKC deck permits are commonly a few hundred dollars per the city fee schedule.	OKC: simple decks often approved within 5–10 business days; over-the-counter for some.	Generally allowed	Oklahoma’s tornado-wind design speeds (≈105–135 mph) drive hold-down hardware, post anchorage, and continuous load path; expansive-clay soils require deeper/larger footings. Exempt: IRC R105.2 exempts decks ≤30 in above grade, but OKC requires a permit for any attached deck and for detached elevated decks regardless of size.
Oregon	Conditional	city	Valuation-based; Portland permit fees follow the city building-permit fee schedule.	Over-the-counter for low decks; plan review for elevated decks.	Generally allowed	Oregon’s seismic-active status means deck ledger and connection details are inspected; footnote to local frost/soil conditions. Exempt: Porches/decks ≤30 in above adjacent grade are exempt (statewide). Portland: decks/stairs >30 in above grade require a permit.
Rhode Island	Conditional	city	Rhode Island statewide valuation-based fee formula (Providence minimum permit fee $125).	Over-the-counter for low decks; plan review for elevated decks (Providence ~3 weeks for decks >200 sq ft).	Generally allowed	Coastal/glacial soils and a 42 in frost depth mean deck footings must be inspected for depth. Exempt: Decks ≤30 in above adjacent grade are exempt (RI follows IRC R105.2).
South Carolina	Conditional	city	Valuation-based; Charleston adds an application + zoning-review fee on top of the permit fee.	Plan review ~2–3 weeks (Charleston); footing inspection before concrete.	Generally allowed	Coastal South Carolina design wind speeds reach 130–160 mph (Wind-Borne Debris Regions); hurricane-rated hardware and flood-zone elevation rules often apply. Exempt: S.C. Code § 40-59-265 exempts decks NOT exceeding 200 sq ft AND not more than 30 in above grade at any point.
South Dakota	Conditional	city	Valuation-based; set by the issuing city.	Over-the-counter or 1–3 weeks depending on complexity.	Generally allowed	Sioux Falls footings must extend to the local 42-inch frost depth; verify with the building department before sizing footings. Exempt: Decks ≤30 in above adjacent grade are exempt under IRC R105.2.
Utah	Conditional	city	Valuation-based; set by the city.	Over-the-counter or 1–3 weeks depending on complexity.	Generally allowed	Utah amendments emphasize proper ledger-board attachment, flashing, and lateral-load connections for decks. Exempt: Decks ≤30 in above adjacent grade are exempt under IRC R105.2.
Vermont	Conditional	city	Valuation-based where enforced.	Over-the-counter or 1–3 weeks where enforced.	Generally allowed	Vermont frost depth runs 48–60 in; deck footings must extend below the local frost line. Snow loads 40–70 psf apply. Exempt: Decks ≤30 in above adjacent grade are exempt under IRC R105.2.
West Virginia	Conditional	city	Valuation-based; fees waived for total job cost ≤ $2,500.	Over-the-counter or 1–3 weeks depending on complexity.	Generally allowed	Charleston issues permits for decks; follow the state code footing/frost and guardrail requirements. Exempt: Decks ≤30 in above adjacent grade are exempt under IRC R105.2.
Wyoming	Conditional	city	Valuation-based where enforced.	Over-the-counter or 1–3 weeks depending on complexity.	Generally allowed	Cheyenne footings must address high wind and deep frost; verify with the building department. Exempt: Decks ≤30 in above adjacent grade are exempt under IRC R105.2.

🪵 Deck / Porch permit in Washington