Deck Permit in Clark County, Washington
By Mario Bailey Last checked 2026-07-19 · 2 official sources
Verified against official sources Confirmed on official pageIt depends
Quick answer
In general decks require permits in unincorporated Clark County and are processed under the ADS (Additional Dwelling or Structure) permit type. Decks are exempt only when they do not exceed 200 square feet, are not more than 30 inches above grade at any point, are not attached to a dwelling, and do not serve a required exit door; decks used for hot tubs or pools are not exempt. Even exempt decks must meet setback requirements and be built to building code standards.
Typical threshold: Exempt only if the deck does not exceed 200 square feet, is not more than 30 inches above grade at any point, is not attached to a dwelling, does not serve a required exit door, and is not used for a hot tub or pool; all other decks require a permit.
Who is pulling this permit?
Apply yourself
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Before you sign, ask the contractor:
- Who pulls the permit, you or me, and is the permit fee included in the bid?
- Which inspections will this job need, and who meets the inspector on site?
- Is your contractor license active in this locality, and under which business name?
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When a permit is usually needed
Most decks except small low freestanding decks and entry landings
What your deck permit must meet in Washington
A residential deck in Washington is built to the 2021 International Residential Code as adopted with state amendments (WAC 51-51, Washington State Residential Code 2021), which among other things raises the deck live load to 60 psf. The prescriptive deck rules cover guards, stairs, footings, and a positive ledger and lateral-load connection.
- Guards are required whenever the deck walking surface is more than 30 inches above the grade or floor below (R312).
- Required deck guards must be at least 36 inches high, with openings sized so a 4-inch diameter sphere cannot pass through (R312).
- Deck stairs (any flight with 4 or more risers) allow a maximum riser height of 7 3/4 inches, require a minimum tread depth of 10 inches, and a minimum stairway width of 36 inches (R311.7).
- Stairs with 4 or more risers need a handrail on at least one side, with the top 34 to 38 inches above the stair nosing (R311.7.8).
- Exterior footings must be placed at least 12 inches below undisturbed ground (R403.1.4); frost-protection depth is not a single statewide number but is set by the local jurisdiction, so confirm frost depth with the local building department (R403.1.4.1).
- The deck ledger must have a positive connection to the band joist using lag screws or bolts spaced per Table R507.9.1.3, not toenails or deck screws, and the band joist must be minimum 2-inch nominal solid-sawn lumber or engineered rim board (R507.9).
- A lateral load connection is required: hold-down tension devices in at least two locations per deck, each with a capacity of not less than 1,500 pounds (R507.9.2).
Based on Washington State Residential Code 2021 (2021 IRC with WA amendments, WAC 51-51): R312, R311.7, R403.1.4, R507.9. Read the code. Local amendments can be stricter; confirm the current requirement with your office before you build.
What deck permit costs in Clark County
Fees are established by county ordinance and calculated automatically during the application process; permit fees cover processing, plan review and inspections.
How Clark County compares in Washington
| Jurisdiction | Permit needed? | Threshold |
|---|---|---|
| Bellevue | It depends | decks where the highest walking surface is 30 inches or less above grade do not require a permit; decks over 30 inches above grade require a permit with plan review |
| Clark Countythis page | It depends | Exempt only if the deck does not exceed 200 square feet, is not more than 30 inches above grade at any point, is not attached to a dwelling, does not serve a required exit door, and is not used for a hot tub or pool; all other decks require a permit. |
| King County | It depends | uncovered decks 30 inches or less above ground do not require a building permit in unincorporated King County; decks over 30 inches above grade require a permit |
| Pierce County | It depends | Decks not more than 30 inches above grade at any point, and not over any story or basement below, are exempt; Pierce County code sets no separate floor area cap for decks; taller decks, or decks over a story or basement, require a building permit. |
| Seattle | It depends | decks more than 18 inches above grade require a permit; decks 18 inches or less above grade and not over a basement do not require a permit |
| Snohomish County | It depends | uncovered decks, deck steps, and uncovered porches for residential buildings exempt if 30 inches or less above adjacent grade at any point, not over a basement or story below, and not part of a required accessible route; covered or taller decks require a permit |
| Tacoma | It depends | freestanding decks not exceeding 200 sq ft and not more than 30 inches above grade are exempt; decks over 200 sq ft, over 30 inches above grade, or attached to the dwelling require a permit |
How to apply in Clark County
A residential deck permit application is a set of construction documents that show what will be built and prove it meets the IRC deck provisions. In practice that means a scaled site plan locating the deck and its setbacks, plus deck plans and structural details covering the footings, posts, beams, joists, ledger, guards, and stairs.
What most deck permit applications include:
- A permit application identifying the work, the deck's size (square footage), and whether electrical work such as lights or receptacles is included, submitted for plan review before construction begins (IRC R106).
- A scaled site plan (for example 1/4 inch to 1 foot) showing the new deck's location relative to the house, its overall length and width, and dimensioned distances from the deck to all property lines and other structures so required setbacks can be verified (IRC R106.1.1).
- A deck plan drawn to scale showing overall dimensions and the framing layout: joist size, spacing, span, and species; beam size and span; post size and height; and footing or pier size and depth (IRC R507.4 posts, R507.5 beams, R507.6 joists, R507.3 footings).
- A section or side elevation with connection details showing the ledger attachment to the house band joist with flashing, the fastener or bolt schedule, joist hangers, post-to-beam and post-to-footing connections, and the required lateral load connection (IRC R507.9 ledger connection, R507.9.2 lateral connection, R507.2.4 flashing).
- Footing sizing derived from tributary area, the soil bearing value, and design loads per IRC Table R507.3.1, with footings shown bearing on undisturbed soil at the frost depth required by the jurisdiction (IRC R507.3).
- Details for the guards required where the walking surface is more than 30 inches above grade, and for the stairs and handrails, showing guard height and opening limits, stair riser and tread dimensions, and handrail location (IRC R312 guards, R311.7 stairs and handrails).
- For designs that fall outside the prescriptive R507 tables (for example multi-story or stacked decks, or a ledger attached to a cantilever), engineered and stamped structural plans are submitted in place of the prescriptive details (IRC R507.1 and R301).
General submittal guidance from IRC R106.1.1 (construction documents) and IRC R507 (exterior decks), 2021 IRC. Source. Clark County Community Development, Building Safety sets the exact checklist for Clark County.
Where to apply in Clark County:
Clark County Community Development, Building Safety
- Public Service Center, 1300 Franklin St., Vancouver, WA 98660
- Phone: 564.397.2375
- Email: permitservices@clark.wa.gov
Inspections and closing out your permit
Deck work is inspected in sequence as it is built: the footings before concrete is placed, the framing before the decking boards go down, and a final inspection once the deck is complete. Each stage checks the items that would be hidden or unsafe if missed.
- Footing or pier inspection: after the holes are dug and any forms or reinforcing are set but before concrete is placed, the inspector checks footing depth and diameter, a flat undisturbed bearing surface, and that the holes are free of water (IRC R109.1.1 foundation inspection; R507.3 footings).
- Framing inspection: after the deck is framed but before the decking conceals it, the inspector verifies the ledger attachment and its flashing, the fastener and bolt schedule, joist hangers and metal connectors, post-to-beam and post-to-footing connections, and the lateral load connection; call it before decking is installed (IRC R109.1.4 frame inspection; R507.9 ledger and flashing).
- Final inspection: after the deck is complete and before it is used, the inspector confirms guard height and opening limits (a 4 inch sphere must not pass, 4 3/8 inch at stairs), stair riser and tread dimensions, handrail height and graspability where there are 4 or more risers, stair landings, and required stair lighting (IRC R109.1.6 final inspection; R312 guards, R311.7 stairs and handrails).
Schedule each inspection in advance and pass the final before you use the work or close the permit. Request inspections through the Clark County permit portal or by phone at 564.397.2375.
Inspection sequence from IRC R109 (inspections: R109.1.1 footing before concrete, R109.1.4 frame, R109.1.6 final), 2021 IRC. Source. An open permit left un-inspected can surface later in a title search or home sale.
Your Deck Permit checklist for Clark County
- Confirm the requirement. Sometimes, depending on the project. Typical threshold: Exempt only if the deck does not exceed 200 square feet, is not more than 30 inches above grade at any point, is not attached to a dwelling, does not serve a required exit door, and is not used for a hot tub or pool; all other decks require a permit. Usually needed: Most decks except small low freestanding decks and entry landings.
- Budget the fee. Fees are established by county ordinance and calculated automatically during the application process; permit fees cover processing, plan review and inspections. Official fee schedule.
- Apply. A residential deck permit application is a set of construction documents that show what will be built and prove it meets the IRC deck provisions. In practice that means a scaled site plan locating the deck and its setbacks, plus deck plans and structural details covering the footings, posts, beams, joists, ledger, guards, and stairs. Start at the Clark County permit portal.
- Keep the office details handy. Clark County Community Development, Building Safety. Phone: 564.397.2375. Address: Public Service Center, 1300 Franklin St., Vancouver, WA 98660.
- Plan for inspections. Deck work is inspected in sequence as it is built: the footings before concrete is placed, the framing before the decking boards go down, and a final inspection once the deck is complete. Each stage checks the items that would be hidden or unsafe if missed.
Compiled from the official sources on this page. Last checked 2026-07-19.
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Frequently asked questions
- Do you need a deck permit in Clark County?
- In general decks require permits in unincorporated Clark County and are processed under the ADS (Additional Dwelling or Structure) permit type. Decks are exempt only when they do not exceed 200 square feet, are not more than 30 inches above grade at any point, are not attached to a dwelling, and do not serve a required exit door; decks used for hot tubs or pools are not exempt. Even exempt decks must meet setback requirements and be built to building code standards. Exempt only if the deck does not exceed 200 square feet, is not more than 30 inches above grade at any point, is not attached to a dwelling, does not serve a required exit door, and is not used for a hot tub or pool; all other decks require a permit. Always confirm with the office before starting.
- How much does a deck permit cost in Clark County?
- Fees are established by county ordinance and calculated automatically during the application process; permit fees cover processing, plan review and inspections. See the official fee schedule for current amounts.
- Where do you apply for a deck permit in Clark County?
- You can apply through the Clark County permit portal or contact the Clark County Community Development, Building Safety directly. The links are listed on this page.
From the Library
What else needs a permit in Clark County
Every other permit type we have verified for this jurisdiction, with the rule that applies here.
| Project | Permit needed? | Threshold | Typical fee |
|---|---|---|---|
| Electrical Permit | Permit required | Electrical work in Washington requires a permit and inspection, with a few exceptions listed in chapter 296-46B-901 WAC; in unincorporated Clark County electrical permits are issued by state Labor and Industries, not the county. | No county fee; |
| Fence Permit | It depends | Fences seven feet or less in height do not require a permit; fences over 7 feet in height require a Fence/Retaining Wall (FRT) permit. | Fees are established by county ordinance and calculated automatically during the applic... |
| HVAC Permit | Permit required | Mechanical permits cover installation of heating and cooling equipment such as furnaces, heat pumps, A/C units, ductless mini splits and gas piping; for additions and new construction this work is included in the ADS or NHC permit. | Application rev 1.30.23: $94 issuance plus per-appliance fees including furnace or heat... |
| Patio Permit | It depends | Patio and concrete slabs on the ground grade are exempt from permit but may not be built on easements; adding a patio cover or enclosing a covered patio requires a building permit under the ADS permit type. | Fees are established by county ordinance and calculated automatically during the applic... |
| Plumbing Permit | Permit required | A plumbing permit is required for installation of any plumbing fixtures, including water heaters, toilets and sinks. | Application rev 9.2.25: $94 issuance plus per-item fees including plumbing fixture/trap... |
| Pool Permit | It depends | A permit is required for any structure intended for swimming or recreational bathing that contains water over 24 inches deep, including in-ground, aboveground and on-ground pools, hot tubs and spas. | Fees are established by county ordinance and calculated automatically during the applic... |
| Roof Replacement Permit | Permit required | Re-roofing permits are required for all buildings in Clark County; a separate permit may be required if structural work such as replacing roof sheathing is necessary. | County handout rev 7.16.18: residential re-roofing permit $220 plus $94 issuance and $6... |
| Shed Permit | It depends | Sheds over 200 square feet require a building permit; sheds of 200 square feet or less are exempt if they meet setbacks and easements, but any size shed in a mobile home park or multi-family zone requires a permit. | Fees are established by county ordinance and calculated automatically during the applic... |
| Solar Permit | Permit required | Separate SOL permits are required for ground mounted units or panels mounted on existing buildings; in new construction the solar panels are included in the NHC or ADS permit. | Fees for separate SOL permits are based on construction value; |
Deck Permit in other Washington localities
Official sources
- https://clark.wa.gov/community-development/residential-permits
- https://clark.wa.gov/community-development/building-faqs
- https://www.grafton-ma.gov/DocumentCenter/View/17797/2021-IRC-Residential-Deck-Guide
- https://www.spearfish.gov/DocumentCenter/View/5233/Residential-Deck-handout-PDF
- https://www.co.pacific.wa.us/dcd/images/apps-forms/Deck%20Handout-final.pdf
Verified by a person against the sources above on 2026-07-19, not confirmed with Clark County Community Development, Building Safety. Rules change; confirm before you build. How we verify.
Last checked: 2026-07-19Report an error on this page
Compare Deck Permit requirements across Washington localities
Washington rule changes
- Bellevue, WA sets a flat $290 re-roof permit fee (Ordinance 6879)
Ord. 6879 · 2026-07-25