Bathroom Remodel Permit in Longview, WA (2026)

Research by DoINeedAPermit Research Team · Updated May 2026

The Short Answer

A full bathroom remodel in Longview requires a permit if you're relocating plumbing fixtures, adding electrical circuits, installing new exhaust venting, converting a tub to shower, or moving walls. Cosmetic-only work (tile, vanity swap in place, faucet replacement) does not need a permit.

Longview enforces the 2015 International Building Code with Washington State amendments, and the City of Longview Building Department operates a permit-tracking portal that requires online submission for most residential work — no over-the-counter same-day permits for bathroom remodels. The permit threshold hinges on whether you're touching fixture locations, electrical capacity, or drainage assembly: if any of those apply, you file. Longview's frost depth varies significantly (12 inches near the Columbia River floodplain, 30+ inches inland toward the Cowlitz), which affects how inspectors evaluate plumbing trap runs and floor penetrations — a detail often missed when homeowners pull permits without understanding local soil conditions. The city also requires proof of septic or sewer connection status before approving any plumbing work, a step that trips up owners who assume their existing system is documented. Plan-review turnaround in Longview typically runs 2–3 weeks for bathroom remodels (faster than metro Seattle), and the city requires GFCI and AFCI protection per NEC 210.12, plus shower waterproofing specification (cement board + liquid membrane or equivalent) before rough-in sign-off.

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

Stop-work orders issued by the Building Department carry $200–$500 fines in Longview, plus you'll be forced to pull a permit retroactively and pay double the standard fee ($400–$1,600 total).
Insurance claims for water damage (common in bathroom remodels involving shower pan work) are routinely denied if the work was unpermitted — a $10,000+ hit that voids your homeowner's coverage.
At sale, unpermitted bathroom work must be disclosed on the Property Condition Disclosure or Seller's Affidavit; many buyers walk away, and appraisers will reduce home value by 5–10% ($15,000–$30,000 on a $300K home).
Lenders and refinance processors flag unpermitted bathroom electrical work as a code violation; FHA loans will not close until the work is brought up to code or bonded ($2,000–$5,000 for a compliance bond).

Longview bathroom remodel permits — the key details

Longview adopts the 2015 International Building Code (IBC) and International Residential Code (IRC), enforced by the City of Longview Building Department. The critical rule for bathroom remodels is straightforward: any work that relocates a fixture, modifies the drainage system, adds new electrical circuits, installs or relocates exhaust venting, or moves structural walls requires a permit. The IRC P2706 governs drainage fittings and trap-arm length — in Longview's variable frost-depth zones, inspectors will verify that trap arms do not exceed 5 feet horizontal run and that floor-penetrating drains are sloped correctly (1/4 inch per foot minimum). If you're replacing a vanity, toilet, or faucet in its original location without touching supply or drain lines, you do not need a permit. The confusion often arises because homeowners conflate 'full bathroom remodel' with 'permit-required bathroom remodel' — the scope determines the answer, not the label.

Electrical work in bathrooms triggers mandatory GFCI and AFCI protection under NEC 210.12 and Washington State amendments. Any outlet within 6 feet of a sink basin or tub must be GFCI-protected; Longview inspectors will reject rough-in plans that lack this protection or misplace outlets. If your remodel adds a new circuit (for heated towel rack, exhaust fan with damper, or additional lighting), the electrical plan must be stamped by a licensed electrician or the permit will be denied. Many homeowners attempt to reclassify bathroom electrical work as 'swap-in-place' to avoid the circuit-plan requirement — this fails inspection. Longview's Building Department has published FAQ guidance (available on their online portal) clarifying that any bathroom electrical work must be shown on a one-line diagram with breaker size, wire gauge, and GFCI/AFCI locations noted.

Shower and tub waterproofing is where Longview inspectors most frequently issue rejection notices. IRC R702.4.2 mandates a complete waterproofing assembly for any new or relocated tub or shower enclosure. Longview inspectors will accept cement board + liquid waterproof membrane, pre-sloped shower pans with membrane, or engineered waterproofing systems — but the specification must appear in writing on your permit application. Many remodelers assume 'standard waterproofing' is obvious; it is not. You must identify the product (e.g., 'Schluter Kerdi system' or 'RedGard liquid membrane over cement board'), include the manufacturer's installation guide in your plan package, and schedule a framing inspection after the membrane is installed but before drywall. Shower valve installation (single-handle diverter or three-way mixing valve) must be pressure-balanced per code; Longview inspectors verify the valve spec on the plan.

Exhaust ventilation is mandatory for bathrooms without operable windows. IRC M1505 requires a minimum 50 cubic feet per minute (CFM) exhaust fan ducted to the outside (not into the attic or soffit). Longview's code includes the Washington State amendment requiring duct insulation in unconditioned spaces to prevent condensation. Many homeowners install a fan 'vented to the attic' — this will fail inspection and must be corrected. Your permit application must include duct diameter, run length, damper type, and termination location (roof or wall). If ductwork exceeds 25 feet, CFM demand increases; the inspector will verify your fan is sized correctly. Condensation damage from improper venting is a common post-remodel complaint, and Longview inspectors are vigilant about this.

The permit process in Longview begins with online submission via the city's permit portal (accessible from the Longview Community Development Services website). You'll upload a site plan, floor plan showing new fixture locations, electrical diagram (if applicable), and plumbing isometric or rough-in sketch. Plan review typically takes 2–3 weeks; if there are deficiencies (waterproofing spec missing, trap arm exceeds 5 feet, GFCI placement wrong), the city issues a request for information (RFI) and you resubmit. Once approved, you receive a permit number and can schedule rough-plumbing, rough-electrical, and framing inspections. Longview does not require a final mechanical inspection if the bathroom is interior-only; the final inspection is visual (fixture installation, outlet cover plates, caulking, tile, etc.). Total timeline from submission to final sign-off ranges from 4–8 weeks, depending on resubmittal cycles. Permit fees are typically $200–$500 for a standard full bathroom remodel (calculated as a percentage of project valuation, roughly 1.5–2% of estimated cost).

Three Longview bathroom remodel (full) scenarios

Scenario A

Moving shower to opposite wall in master bath — Mint Hill neighborhood, 1985 home, new waterproofing assembly required

You're moving the shower from the north wall to the south wall in a 1985 ranch home in Mint Hill (west Longview, 12-inch frost depth). This relocation requires new supply lines, drain reconfiguration, and a complete waterproofing assembly on the new wall. The old shower drain must be capped and abandoned per code. You'll file a full bathroom remodel permit with a plumbing rough-in isometric showing the new trap-arm run (maximum 5 feet, sloped 1/4 inch per foot), the new supply risers (1/2-inch copper or PEX), and the shower valve specification (Moen Positemp or equivalent, pressure-balanced, pressure-relief valve rated for your water pressure). Your permit application must include a written waterproofing plan: cement board substrate + Redgard liquid membrane, with the Redgard technical sheet attached. The city will also require proof that your home is connected to the Longview municipal sewer (not a septic tank, which would have different requirements). Rough-plumbing inspection comes first (24 hours notice); the inspector verifies the trap arm, supply line sizes, and valve location. Once approved, you can rough-frame and apply waterproofing membrane. The waterproofed wall must be signed off before drywall goes up (second inspection). Final sign-off happens after tile, fixtures, and grout are installed. Total permit fee: $350–$450 (2% of estimated $20,000–$25,000 project cost). Timeline: 5–7 weeks from submission to final approval.

Scenario B

Converting soaking tub to walk-in shower with integrated bench — downtown historic district, 1972 vintage bath, asbestos risk

Your 1972 downtown Longview bathroom has a deep soaking tub in the corner; you want to remove it and install a sleek walk-in shower with a built-in bench and frameless glass enclosure. Because you're changing the fixture type and creating a new waterproofing assembly (the tub sits on concrete; the new shower pan requires a sloped subfloor), this is a permit-required project. However, there's a layer of complexity: your 1972 home likely contains asbestos in the floor tile, wall insulation, or plaster. Washington State requires asbestos inspection and notification before any demolition. You must hire a licensed asbestos surveyor (~$300–$500) to test before your permit can be issued; if asbestos is found, a licensed abatement contractor must remove it (adds $2,000–$5,000). Your permit application will include the asbestos survey results (or negative report) and the abatement plan if needed. The waterproofing plan for the new shower must be detailed: pre-sloped pan (e.g., Wedi or Schluter Shower Pan) or site-built pan with sloped mortar bed + membrane. Benchmark height for drain placement is critical — the inspector will verify slope. The integrated bench requires framing and waterproofing at the junction. The downtown historic district (if your address qualifies) may require a Historic Landmarks Commission review; check your address against the historic-district map before submitting. Electrical work is likely minimal unless you're adding a heated bench seat (requires new circuit). Total permit fee: $300–$600 (accounting for asbestos review complexity). Timeline: 3–4 weeks baseline, plus asbestos work (1–2 weeks if removal is needed).

Scenario C

Adding second vanity and new exhaust fan with ductwork in guest bathroom — Riverside area, existing fan vents to attic (must be corrected)

Your guest bathroom in Riverside (east Longview, 30+ inch frost depth, alluvial soil) has one vanity and a 1990s exhaust fan that vents into the attic — a common code violation. You want to add a second vanity (new drain and supply), relocate the existing toilet (new floor flange), and install a new properly-ducted exhaust fan (minimum 50 CFM, insulated ductwork to roof termination). The existing attic-vented fan must be abandoned and capped. This is a multi-trade permit: plumbing (two new drains, one relocated), electrical (new 20-amp circuit for the new fan with GFCI outlet and integral damper switch), and mechanical (exhaust venting). Your permit application includes a floor plan showing the two vanities and toilet locations, a plumbing isometric with the new drain runs (trap arms ≤5 feet, proper slope), an electrical one-line diagram showing the new circuit breaker, wire gauge, and outlet GFCI placement, and an exhaust ductwork diagram showing duct diameter (minimum 6-inch for 50 CFM), insulation type (R-4 or equivalent in unconditioned space), run length, and roof/wall termination. The old attic-vented duct must be clearly marked as abandoned on the plan. Longview inspectors are strict about exhaust-venting compliance — attic moisture damage is a chronic complaint. Your ductwork rough-in must be inspected before drywall; the damper and termination hood must be verified before final. If ductwork exceeds 25 feet or has more than two elbows, CFM demand increases; the inspector will confirm your fan is correctly sized. Electrical rough-in inspection verifies the new circuit and GFCI outlet. Total permit fee: $400–$700 (2% of estimated $25,000–$35,000 project). Timeline: 4–6 weeks from submission to final, assuming no resubmittals.

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Longview's frost-depth variability and plumbing trap-arm rules

Longview straddles two geological zones: the Columbia River floodplain (west, including downtown and Mint Hill) has a frost depth of 12 inches, while inland areas (Riverside, Five Corners) experience 30+ inches of frost. This variation affects how plumbing inspectors evaluate drain runs and floor penetrations. In the 12-inch zone, a trap arm that exits the house through a basement or crawl-space wall may be above the frost line if routed correctly; in the 30+ inch zone, the same routing could freeze and crack. Longview inspectors will ask you to provide a site plan showing frost depth and the location of any floor penetrations or exterior wall penetrations for new drains. IRC P2706 limits trap-arm horizontal run to 5 feet and requires 1/4-inch-per-foot slope; Longview adds the requirement that any trap arm in a frozen zone must be insulated or buried below frost depth. If your remodel includes a floor-mounted toilet or a wall-mounted vanity with a floor drain, the inspector will verify this routing during rough-plumbing inspection. Many homeowners assume 'standard plumbing' handles frost automatically — it does not. You must explicitly address frost-depth routing in your permit application or expect an RFI and resubmittal.

Waterproofing specification failures and how to avoid them in Longview

Longview Building Department's most common bathroom remodel rejection is inadequate or unspecified waterproofing. IRC R702.4.2 requires a complete waterproofing assembly for any new or relocated shower or tub, but the code does not mandate a specific product — it mandates a system. Longview inspectors will accept three broad categories: (1) Pre-sloped shower pan (e.g., Wedi, Schluter, Kerdi), which is prefabricated and installed per manufacturer; (2) Site-built pan with mortar bed and liquid waterproof membrane (Redgard, Aquadefense, or equivalent cement-board substrate); (3) Engineered systems with specific product certifications. The fatal mistake is submitting a permit application that says 'waterproofing as required by code' without specifying which system or product. Longview's plan-review team will issue an RFI asking for clarification — this adds 1–2 weeks to your timeline. To avoid this, include the product name and a one-page technical data sheet (downloaded from the manufacturer's website) in your initial submission. If you're using Redgard on cement board, attach Redgard's installation guide; if you're using a pre-sloped pan, attach the pan manufacturer's specs and the grout/caulk compatibility chart. The inspector will verify during the framing inspection (after waterproofing is applied but before drywall) that the membrane is continuous, seams are sealed, and pen-penetrations (valve escutcheons, towel bars) are flashed correctly. This upfront clarity cuts your review timeline by 1–2 weeks and eliminates rework.

City of Longview Building Department (Community Development Services)
1525 Commerce Avenue, Longview, WA 98632 (check city website for current permit-intake location)
Phone: (360) 442-1411 (main line; ask for Building Department) | https://www.ci.longview.wa.us/biz/building_permits/ (or search 'Longview WA building permit portal')
Monday–Friday, 8:00 AM–5:00 PM (verify hours on city website before visiting)

Common questions

Do I need a permit to replace my bathroom toilet, vanity, and faucet in the same locations?

No permit is required if you're swapping fixtures in-place (toilet, vanity, faucet) without relocating supply lines or drains. This is cosmetic replacement and falls under the exempt threshold. However, if you're moving the toilet to a new floor location or relocating the vanity drain, you'll need a permit. Always verify with Longview Building Department before starting; if in doubt, call (360) 442-1411.

What's the typical permit fee for a full bathroom remodel in Longview?

Permit fees are calculated as a percentage of project valuation (typically 1.5–2%) plus a flat plan-review fee. Expect $200–$600 depending on scope and estimated cost. A $20,000 remodel will be on the higher end; a $10,000 remodel lower. Exact fee depends on your project valuation estimate. Contact the Building Department before submitting for a fee quote.

How long does plan review take for a bathroom remodel permit in Longview?

Standard plan review takes 2–3 weeks in Longview. If the city issues a request for information (RFI — e.g., missing waterproofing spec or trap-arm detail), you resubmit and another 1–2 weeks passes. Most bathroom remodels see one minor RFI; total timeline from submission to approval is 3–5 weeks. Expedited review is not available for residential bathroom work.

My bathroom has asbestos floor tile and I'm remodeling in downtown Longview. Do I need an asbestos survey?

Yes. Any pre-1980 bathroom tile or insulation in Washington State homes may contain asbestos. Before your permit can be issued, you must hire a licensed asbestos surveyor to test (cost: $300–$500). If asbestos is found, a licensed abatement contractor removes it before renovation (cost: $2,000–$5,000). Include the survey results (negative or positive) in your permit application. This is required by Washington State law, not just Longview.

Can I add electrical outlets in my bathroom without a permit if I'm just replacing existing wiring?

If you're replacing outlets in the same location without changing the circuit or adding new outlets, no permit is required. However, if you're adding new outlets or relocating outlets, you must file a permit and have a licensed electrician design the circuit. Longview enforces GFCI/AFCI protection on all bathroom outlets within 6 feet of a sink or tub — inspectors verify this during the electrical rough-in inspection.

My bathroom exhaust fan currently vents into the attic. Will this pass inspection if I keep it as-is during a remodel?

No. Attic venting of bathroom exhaust is a code violation in Washington State and Longview will not approve it. Any bathroom without an operable window must have exhaust ducted to the exterior (roof or wall termination). If your current fan vents to the attic and you're doing a remodel, you must cap the old ductwork and install a new compliant fan with insulated ductwork to an exterior termination. This is mandatory for permit approval and final sign-off.

What happens if I start my bathroom remodel before getting a permit?

If the city discovers unpermitted work, you'll receive a stop-work order (fine: $200–$500) and be required to pull a permit retroactively. You'll pay double the standard permit fee and may face additional fines if work does not meet code. Your homeowner's insurance will not cover water damage from unpermitted bathroom work, and the unpermitted work must be disclosed at sale. Always pull the permit before demolition.

Do I need to hire a licensed electrician for bathroom electrical work in Longview?

If you're adding new circuits or modifying the electrical system, the circuit design must be stamped by a licensed electrician. You may do simple receptacle swaps in-place as an owner, but for permit work involving new circuits (exhaust fan, heated bench, additional lighting), you must engage a licensed contractor. Longview's permit application requires an electrical one-line diagram; the Building Department will not accept hand-drawn sketches for circuit work.

Is owner-builder work allowed for bathroom remodels in Longview?

Yes, owner-builder work is allowed for owner-occupied residential properties in Washington State. You can pull a permit and perform the work yourself as the homeowner. However, you must still pass all inspections and comply with code. Complex trades (electrical, plumbing) are often easier to hire out; the inspector may require licensed contractor sign-offs for these trades regardless. Verify owner-builder rules with the Building Department before starting.

My bathroom is in a historic district in downtown Longview. Do I need extra approvals?

Possibly. Longview's historic districts (check if your address is listed on the city's historic-preservation map) may require a Historic Landmarks Commission (HLC) design review before permits are issued. This review focuses on exterior visibility and historic fabric. Interior bathroom remodels are less likely to trigger HLC review, but exterior venting (new ductwork terminating on the roof or wall) may be scrutinized. Contact the Building Department and provide your address; they'll advise if HLC review is needed. This adds 2–3 weeks to the timeline.

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 Longview Building Department before starting your project.

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