Do I need a building permit for bathroom remodel in Wilsonville, OR?

Most bathroom remodel projects in Wilsonville require a building permit. Use the 60-second project quiz on this page for an exact answer based on your address and project scope, plus the local fee, timeline, and forms.

How much does a bathroom remodel permit cost in Wilsonville, OR?

Bathroom Remodel permit fees in Wilsonville typically run $100-$800 for residential projects, depending on valuation and trade subpermits. The project quiz on this page returns a fee estimate specific to your project.

How long does bathroom remodel permit review take in Wilsonville, OR?

Plan review in Wilsonville typically clears in 2-4 weeks for standard bathroom remodel projects. Use the project quiz on this page for the exact review window for your address.

Bathroom Remodel Permit in Wilsonville, OR (2026)

Research by DoINeedAPermit Research Team · Updated May 2026

The Short Answer

If you're moving any plumbing fixture, adding new electrical circuits, installing a new exhaust fan duct, converting a tub to shower, or moving walls, you need a permit from the City of Wilsonville Building Department. Surface-only work — tile, vanity swap-in-place, faucet replacement — does not require one.

Wilsonville sits in a wet Willamette Valley climate (zone 4C) where bathroom waterproofing assembly specification is unusually strict in plan review: the city's building official will flag any tub or shower remodel that doesn't explicitly show a certified waterproofing system (cement board + membrane per IRC R702.4.2) in writing before rough framing inspection. Many homeowners in neighboring towns think they can describe 'standard shower waterproofing' verbally to the inspector; Wilsonville requires it documented on the permit set. Additionally, Wilsonville's 12-inch frost depth in the valley floor means any relocated drain line must account for frost-protected vent routing — a detail that kills many DIY plan submissions. The city has recently moved to online permit intake via its municipal portal, but final electrical and plumbing sign-offs still require in-person inspection scheduling. Owner-builders are allowed on owner-occupied single-family homes, but you'll need a builder's license number on file if you're hiring any subcontractors for plumbing or electrical work, even if you're pulling the permit yourself.

What happens if you skip the permit (and you needed one)

Stop-work orders from Wilsonville code enforcement carry a $300–$500 fine plus mandatory permit re-pull at double the original fee if discovered during sale disclosure or neighbor complaint.
Insurance claim denial: insurers routinely deny water-damage claims (mold, rot, subflooring failure) on unpermitted bathroom work; documented cases in Clackamas County run $15,000–$45,000 in denied repairs.
Resale/title disclosure: Oregon Residential Property Condition Disclosure (PCD) requires seller disclosure of unpermitted work; buyers can rescind or demand remediation at your cost ($5,000–$20,000 if walls/fixtures need removal and re-inspection).
Lender lockout: refinance or home-equity lenders will order a title search and appraisal; unpermitted bathroom work kills the deal or forces removal before closing.

Wilsonville bathroom remodel permits — the key details

The City of Wilsonville Building Department enforces Oregon Residential Energy Code (OREC), which incorporates the 2020 International Residential Code (IRC) by reference, with local amendments. The threshold for triggering a full bathroom remodel permit is any of the following: moving a toilet, tub, shower, or vanity sink from its current location; adding a new electrical circuit (including GFCI-protected circuits per IRC E3902); installing a new exhaust fan with ductwork; converting a bathtub to a shower or vice versa (because this changes the waterproofing assembly); or removing or relocating any interior wall. What trips up many homeowners is that Wilsonville's building official interprets 'relocating a sink' to include moving a vanity more than 12 inches from its original rough-in location — if you're staying in the exact same spot, you may be exempt, but if you're shifting the layout, you're in permit territory. The city also enforces a strict reading of IRC M1505 (exhaust fan ventilation): every bathroom must exhaust to outdoors via ducted exhaust fan; you cannot recirculate moist air back into the home. This is especially important in the wet Willamette Valley zone, where humidity and mold risk are high.

Waterproofing assembly specification is the single most common rejection point in Wilsonville bathroom plan reviews. The code requires that any tub or shower enclosure include a Type A waterproofing membrane (per ASTM E96, typically liquid or sheet-applied over cement board or gypsum backer board) tested and labeled for wet-area use. What the city's plan reviewers will not accept is a vague statement like 'standard waterproofing' — you must name the product, cite its ASTM certification, and show on the framing plan exactly where it will be installed (e.g., 'Schluter KERDI membrane over Hardiebacker board, 6 inches up stud framing, sealed at all penetrations'). Many homeowners learn this lesson the hard way: they submit a permit, get a rejection notice citing 'waterproofing assembly not specified per IRC R702.4.2,' and must pay for a plan revision. If you're hiring a contractor, this is their job; if you're DIY-ing, download a sample waterproofing specification sheet from the manufacturer before you file.

Electrical requirements in a full bathroom remodel are non-negotiable and must be shown on your electrical plan. All outlets within 6 feet of a sink, bathtub, or shower must be GFCI-protected (Ground Fault Circuit Interrupter) per IRC E3902.1. Additionally, any new or modified circuit serving lights or exhaust fans must be AFCI-protected (Arc Fault Circuit Interrupter) if it's a 15- or 20-amp general lighting circuit. The city will not issue a permit until your electrical plan clearly identifies which circuits are GFCI-protected and which are AFCI-protected; a handwritten note on a generic electrical diagram is not sufficient. If you're not adding new circuits (e.g., just replacing an in-place toilet or vanity), you typically don't need electrical review. But if you're adding a heated towel rack, ventilation fan, or in-floor heating, you're adding a circuit, and you must file.

Plumbing trap and vent requirements are strict in Wilsonville, especially for relocated drain lines. When you move a toilet, sink, or shower, the new drain line must comply with IRC P2706 (minimum trap arm length: the horizontal pipe from the fixture to the vent cannot exceed 1.5 times the fixture drain diameter, typically 2.5 feet for a toilet or tub). The city's plumbing inspector will check this in the rough plumbing inspection; if your trap arm is too long, you'll be ordered to relocate the fixture closer to the vent stack or install a separate vent loop, adding cost and complexity. Wilsonville's 12-inch frost depth (in the Willamette Valley) means any new vent termination through the roof must be insulated or heated-trace-taped if it's in an unheated attic or exterior wall. This detail is often overlooked in DIY plans and generates change orders. The city also requires that all water-supply lines be protected from freezing, even interior supply lines, if they run near exterior walls in zones 5B (east of the valley) — a detail that varies by neighborhood.

Inspection sequence and timeline for a full bathroom remodel in Wilsonville typically runs 3–5 weeks from permit issuance to final sign-off, assuming no rejections. The standard sequence is: plan review (1–2 weeks); rough plumbing inspection (must be called before drywall goes up); rough electrical inspection (GFCI/AFCI circuits and exhaust fan wiring); optional framing inspection (the city often skips this if it's a remodel of existing walls, not new construction); drywall inspection (often combined with rough); and final inspection (after tile, trim, fixtures are installed, and ventilation fan is operational). Each inspection requires a 24-hour advance call to the city's inspection hotline or online portal. Wilsonville's building department is lean, and inspectors may have travel time from other projects; plan for a 2–3 day wait between your call and the scheduled inspection. Owner-builders can pull permits, but if you hire any trades (plumber, electrician, HVAC), they must provide proof of licensure to the city before work begins. Oregon requires that plumbers and electricians carry an active license; contractors who work unlicensed face fines and liens, and the city will stop work if discovered.

Three Wilsonville bathroom remodel (full) scenarios

Scenario A

Tile and vanity refresh: same-location vanity swap, new tile on existing walls, in-place toilet replacement — Wilsonville residential

You're replacing the vanity with a new one in the same spot, re-tiling the walls over existing drywall (not moving any pipes or tub), and swapping out the toilet for a new low-flow model. This is surface-only work and does not require a permit under Wilsonville code. The toilet replacement does not trigger a permit because you're not moving the drain or water supply lines — you're unscrewing the old one and bolting the new one to the existing flange. Same logic applies to the vanity: if the new vanity's drain and supply rough-ins line up with the existing wall plumbing, no permit. Tile work over existing drywall (no wall removal, no new waterproofing membrane required) is cosmetic and exempt. However, if the new vanity's sink drain or supply is more than 12 inches away from the old vanity's rough-in location, you've crossed into 'relocation' territory and now need a permit. Before you buy the vanity, measure the rough-in locations on your current vanity and confirm the new one matches; if it doesn't, you're looking at a permit ($250–$400 depending on plan complexity), a 2–3 week review, and a rough plumbing inspection. For a true surface-only refresh, no permits, no inspections, no fees — just make sure you're not moving any pipes or walls.

Scenario B

Partial reconfiguration: vanity moved 18 inches, new exhaust fan duct installed, existing tub stays in place — Wilsonville 1970s ranch, Willamette Valley zone

You're moving the vanity to a new wall location (18 inches from the current rough-in), which means relocating both the sink drain and water supply lines. This triggers a permit. You're also adding a new exhaust fan with ductwork routed through the roof, which is a second permit trigger. The existing tub stays in place, so you're not changing the waterproofing assembly, which saves you from a full shower/tub remodel spec. Here's what you'll file: a permit application ($275–$350 valuation-based), plumbing plan showing the new vanity drain line with trap arm length confirmed under 2.5 feet, electrical plan showing the exhaust fan circuit as GFCI-protected, and vent termination detail showing the duct routed to outdoors and insulated where it passes through the unheated attic (Wilsonville's 12-inch frost depth in the valley means you must address freeze protection). Plan review runs 2 weeks; the building official will likely ask for clarification on trap arm length and vent insulation. Once approved, you'll schedule rough plumbing and rough electrical inspections (1 week apart), then final after the fan is operational. Total timeline: 4–5 weeks. Cost: permit ($275–$350), plumbing rough ($400–$600), electrical rough ($200–$300), duct and fan materials ($300–$800), labor to relocate vanity drain ($800–$1,500), and final inspections (included in rough). Total project cost $2,500–$4,500, with permit and inspections accounting for roughly 20% of the spend.

Permit required (fixture relocation + exhaust fan) | Vanity drain trap arm length verified (under 2.5 ft required) | Exhaust duct insulated in attic (12-inch frost depth zone) | Rough plumbing and electrical inspections | Waterproofing assembly unchanged (existing tub retained) | Total project $2,500–$4,500 | Permit and inspections $875–$1,250

Scenario C

Full gut: tub-to-shower conversion, three fixtures relocated, new electrical subpanel circuit, accent wall removed — Wilsonville historic neighborhood (if applicable overlay exists)

This is a full bathroom remodel. You're converting an existing bathtub to a walk-in shower (waterproofing assembly change), moving the toilet to a new wall location, relocating the vanity sink 3 feet over, and adding a heated towel rack (new electrical circuit). You're also removing a non-load-bearing accent wall to open up the layout. This is the most complex permit scenario and will require a full set of plans: architectural framing plan (showing wall removal and new layout), plumbing plan (fixture locations, drain sizes, trap arm lengths, vent routing), electrical plan (GFCI and AFCI circuits for new towel rack and exhaust fan), and a detailed waterproofing specification for the new shower. The waterproofing spec is critical: Wilsonville will reject your permit if you don't specify the exact membrane product, thickness, and installation sequence. A typical spec reads: 'New shower enclosure: 1.5-inch cement backer board over 2x4 studs, Schluter KERDI waterproof membrane (0.6 mm thickness) applied to all surfaces 6 inches above highest water line, sealed at all edges and penetrations per manufacturer instructions; finished with ceramic tile and Schluter KERDI-BAND at all corners.' Without this level of detail, plan on a rejection and a 1–2 week revision cycle. Cost: permit ($450–$600 depending on valuation), plan prep if you hire a designer ($400–$800), plumbing rough ($600–$900), electrical rough ($300–$500), framing inspection (if the city requires it, typically included), drywall (if wall is moved), shower waterproofing materials ($800–$1,500), tile and finish ($2,000–$4,000), labor ($4,000–$8,000). Total project cost $8,000–$16,000, timeline 5–7 weeks. If your home is in a historic district (Wilsonville has a limited number of historic overlays), you may need a historic preservation review before the building permit is issued, adding 2–3 weeks to the process.

Permit required (full fixture relocation + wall removal + tub-to-shower conversion) | Waterproofing specification must be detailed and product-specific | New electrical circuit for heated towel rack (GFCI + AFCI review) | Rough plumbing, electrical, framing, and final inspections | Potential historic overlay review (if applicable, adds 2–3 weeks) | Total project $8,000–$16,000 | Permit and inspections $1,200–$2,000

Every project is different.

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City of Wilsonville Building Department
Contact city hall, Wilsonville, OR
Phone: Search 'Wilsonville OR building permit phone' to confirm
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Disclaimer: This guide is based on research conducted in May 2026 using publicly available sources. Always verify current bathroom remodel (full) permit requirements with the City of Wilsonville Building Department before starting your project.

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