Bathroom Remodel Permit in Erlanger, KY (2026)

Research by DoINeedAPermit Research Team · Updated May 2026

The Short Answer

A full bathroom remodel in Erlanger requires a permit if you're moving fixtures, adding electrical circuits, installing new exhaust venting, or relocating walls. Surface-only swaps (vanity, faucet, tile) in existing locations are exempt.

Erlanger enforces the Kentucky Building Code (2021 edition), which closely mirrors the IRC, but Erlanger's Building Department is notably thorough on waterproofing documentation for tub and shower enclosures—they require a detailed specification sheet showing your waterproofing assembly (cement board + membrane, schluter, kerdi, or other code-approved system) before they issue a permit. This is stricter than some neighboring Northern Kentucky cities, which may accept more generic descriptions. Erlanger also operates an online permit portal where you can upload PDF plans and track status, though staff often prefer in-person submission for bathroom remodels because the waterproofing detail questions usually require a quick conversation. The city's permit fees run $300–$700 for a typical full bathroom gut (valuation-based, typically 1.5–2% of declared project cost), and plan review takes 2–4 weeks. If you're in a pre-1978 home and disturbing more than 20 square feet of paint, lead-safe work practices apply under federal rules Erlanger enforces at inspection.

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

Stop-work order and $250–$500 fine from Erlanger Building Department; you must pull a permit retroactively and pay double permit fees (~$600–$1,400 total).
Insurance claim denial if a plumbing leak or electrical fault occurs in unpermitted work; your homeowner's policy may refuse to cover water damage or fire.
Resale disclosure requirement: Erlanger deed transfers require disclosure of all unpermitted work; buyers can walk away or demand you remove/permit it before closing.
Lender and refinance blocking: banks performing appraisals or refinances will flag unpermitted bathroom work and may refuse to fund the loan until it's permitted and inspected.

Erlanger full bathroom remodel permits—the key details

Erlanger Building Department enforces the 2021 Kentucky Building Code, which adopts the 2021 IRC with minimal local amendments. The core rule for bathroom permits is simple: if you're changing anything structural, mechanical, electrical, or plumbing—beyond cosmetic surface finishes—you need a permit. This includes relocating a toilet, sink, or shower; adding a new circuit for heated floor or exhaust fan; converting a tub to a shower (which requires a new waterproofing assembly under IRC R702.4.2); venting an exhaust fan to the exterior; or moving any walls. Erlanger's online portal allows you to submit plans electronically, though the Building Department's typical workflow for bathroom remodels includes a brief telephone or walk-in consultation before you file, because the waterproofing detail requirement often surprises contractors. The city's unique angle here is their insistence on a waterproofing specification sheet at plan-review time—not just 'use waterproofing' but the exact product (brand, thickness, installation method) per the manufacturer's requirements. This prevents two-week delays mid-permit-review and is worth doing right the first time.

Plumbing work in a bathroom remodel triggers the toughest code scrutiny in Erlanger. If you're relocating any fixture drain, IRC P2706 limits trap-arm horizontal run to 6 feet (or 3 feet if the drain is indirect, like under a vanity). Erlanger inspectors check this dimension on rough-in, and a trap arm that's too long will fail inspection and require re-routing—an expensive mid-project change. Toilet flange height must be 1 inch above the finished floor per IRC P2805.3; if your new finished flooring is thicker than existing, you'll need a flange extension. Shower and tub drains must slope at 1/4 inch per foot minimum, and Erlanger's inspectors often verify this with a level on rough plumbing. If you're installing a new exhaust fan, IRC M1505 requires it to vent outdoors (not into an attic), and Erlanger does NOT allow duct termination into a soffit or gable vent in climate zone 4A—the duct must exit through the roof or a side wall with a dampered cap. Duct runs longer than 25 feet require oversizing the fan CFM rating, a detail many DIYers miss. Plan-review staff will flag a ductwork diagram that doesn't show the termination location, so submit it clearly on your mechanical plan.

Electrical work in a bathroom remodel is heavily regulated under the 2021 NEC (National Electrical Code), which Kentucky adopts. Every bathroom outlet and lighting circuit must be protected by GFCI (ground-fault circuit interrupter) per NEC 210.8(A)—this includes the vanity, shower light, and any adjacent outlets within 6 feet of a sink. Erlanger inspectors verify GFCI protection is either via a GFCI receptacle or a GFCI breaker in the panel, and you must show this on your electrical plan before they issue the permit. If you're adding a heated floor, that circuit must be on a separate 20-amp circuit with its own GFCI breaker, and the floor-heating mat must have a ground-fault sensor per NEC 424.95. Bathrooms in Kentucky also fall under AFCI (arc-fault circuit interrupter) protection if the circuit is an extension of existing 120-volt branch circuits per the 2021 NEC, so any new circuit you add for exhaust fans or lighting should be AFCI-protected. Erlanger's plan review will check that your electrical diagram clearly labels GFCI and AFCI breakers; missing labels or generic 'per code' language causes rejections. Ventilation is a special case: if you're adding a new exhaust fan, the switch and wiring must be on a separate circuit (not shared with lighting), and the fan must run for at least 20 minutes after occupancy per IRC M1505.2—Erlanger inspectors verify this via a timer or humidity sensor on rough-in, so specify which type in your plan.

Waterproofing is the single biggest reason bathroom remodels get flagged or rejected in Erlanger. If you're converting a tub to a shower or installing a new shower enclosure, IRC R702.4.2 mandates a continuous water-resistive barrier (membrane or waterproof board) on the substrate, typically mounted on studs before tile. The code accepts several assembly types: cement board (1/2 inch) plus a sheet membrane (Kerdi, RedGard, Noble Seal, etc.), pre-made waterproof backer board (Schlüter, Durable, Hardibacker Durock Cement Board), or liquid-applied membranes over green board. Erlanger does NOT accept unprotected drywall or greenboard alone behind tile in a shower—this is a code violation and a frequent inspection failure. The waterproofing must extend 6 inches above the rim of a tub and the full height of a shower enclosure, and any shelf or recessed niche in the shower must be waterproofed on all sides. Submit a detail drawing on your plan showing the waterproofing assembly at a section view (e.g., 'Section A-A: Shower Wall'), including stud framing, membrane, substrate, and tile. Label the exact product names and thicknesses (e.g., 'Kerdi-Board 10mm waterproof substrate + Kerdi waterproofing membrane per Schlüter-Systems installation manual'). Erlanger staff will contact you if the detail is missing or generic; having it pre-submitted saves a 1–2 week delay.

Erlanger's permit process for bathroom remodels typically follows this timeline: submit plans online or in-person (24-hour turnaround for completeness check), plan review (2–4 weeks depending on backlog), issue permit, rough plumbing inspection (must be done before you close walls), rough electrical inspection (same), framing/drywall inspection (optional if no walls are moved), final inspection (after tile and fixtures are installed). If you're doing this as an owner-builder (allowed in Kentucky for owner-occupied homes), you'll be on site for all inspections; if you hire a licensed contractor, they coordinate with inspectors. Erlanger inspectors often request site visits if waterproofing details on the plan seem incomplete, so budget an extra week if you need to clarify. Permit fees are calculated on declared project valuation: a typical $15,000 bathroom remodel pays $225–$400 in permit fees (1.5–2% of valuation). The fee includes plan review, one set of inspections, and permit issuance. If you fail an inspection and have to re-inspect, there's usually a $50–$75 re-inspection fee. Erlanger does not offer expedited review for residential bathroom remodels, so plan for the full 2–4 week cycle.

Three Erlanger bathroom remodel (full) scenarios

Scenario A

Vanity and tile swap in existing bathroom (same plumbing locations, no wall moves) — Erlanger home built 1995

You're replacing an old vanity with a new one in the same location, re-tiling the walls (removing old tile, patching drywall, installing new tile), and swapping the faucet. The toilet stays in place, the shower pan and tub are untouched, and you're not moving any drains or vents. This is surface-only work and does NOT require a permit under Erlanger code. You can pull permits for other parts of your home remodel (kitchen, for example) and do this bathroom cosmetic work without separate permitting. However, if your home was built before 1978 and you're disturbing more than 20 square feet of paint (e.g., scraping old tile adhesive and paint), you must follow lead-safe practices—use wet methods, contain dust, and dispose of lead-bearing debris as hazardous waste. Erlanger doesn't issue a separate lead permit, but the Environmental Protection Agency rules apply and your contractor must be EPA-certified if you hire one. The vanity swap itself (plumbing connections for supply lines and drain) is cosmetic replacement and no inspection is required. Cost: vanity ($400–$1,500), faucet ($150–$600), tile ($800–$2,000), labor ($1,500–$3,000); total project $3,000–$7,000, zero permit fees.

No permit required (cosmetic/surface work) | Lead-safe practices required if pre-1978 (EPA 40 CFR Part 745) | P-trap must connect to existing drain stub (no new venting) | Total project $3,000–$7,000 | Zero permit fees

Scenario B

Tub-to-shower conversion with relocated drain — Erlanger 1960s ranch, moving toilet 6 feet

You're gutting the bathroom, converting a clawfoot tub to a walk-in shower, relocating the toilet to a new plumbing wall, and adding a new vanity on the opposite wall. The drain line for the shower must be re-routed because the new shower footprint is 3 feet away from the old tub location. The toilet drain also needs a new trap and vent stack (or a revent loop to the existing stack). This is a multi-system permit: plumbing, mechanical (exhaust fan), and electrical (GFCI outlets, new lighting circuit). Plan review will focus on three things: (1) the trap-arm distance on the relocated toilet drain (must not exceed 6 feet horizontal), (2) the waterproofing specification for the new shower enclosure (submit a detail sheet showing cement board + membrane, e.g., Kerdi-Board + Kerdi membrane per Schlüter or RedGard on 1/2-inch cement board), and (3) the shower vent termination through the roof or wall (not into soffit, per Erlanger's strict interpretation of M1505 in climate zone 4A). You'll also need to verify soil stability: Erlanger sits on karst limestone with clay layers, so new plumbing penetrations may hit subsurface voids—the inspector may request a soil report if the new drain location is near a basement wall. Permit fee is ~$400–$600 (based on ~$20,000 valuation). Rough plumbing inspection (trap slopes, trap arm distance, vent termination), rough electrical (GFCI breaker, light switch circuit), and waterproofing inspection before drywall are required. Timeline: 3–5 weeks from permit issue to final inspection.

Permit required (fixture relocation, tub-to-shower conversion, new drain) | Waterproofing assembly spec sheet required (cement board + membrane) | Trap-arm max 6 ft horizontal run | Shower vent must terminate through roof/wall (no soffit) | Rough plumbing + electrical + waterproofing inspections | Permit fee $400–$600 | Total project $15,000–$25,000

Scenario C

Small bathroom addition with new full bath (toilet, sink, shower) — Erlanger home, adding 80 sq ft

You're building an addition to your Erlanger home and adding a brand-new half-bath (or full bath with shower). This is NOT a remodel—it's new construction, so it triggers a different permit pathway. You'll need a building permit for the addition structure (framing, foundation, roof), a plumbing permit for the new rough-in (supply lines, drain, vent), and an electrical permit for the new circuits and GFCI outlets. The Building Department will also require site plan review because Erlanger's zoning overlays may restrict additions in certain neighborhoods (setback distances, lot coverage, impervious-surface limits). The new bathroom must meet all current code for waterproofing, GFCI protection, exhaust fan venting, and drain slopes—exactly like a remodel, but on new construction. However, new construction also requires structural framing inspection, electrical rough-in inspection, plumbing rough-in inspection, insulation inspection, drywall inspection, and final inspection. This is typically a 6–12 week process depending on Erlanger's building permit backlog. Because you're adding square footage to your home, local property tax will increase after the addition is permitted and completed. The permit fee for a new bathroom addition is usually higher ($800–$1,500) because the building permit component includes site review and multiple inspections. If the addition requires new water/sewer service lines or impacts the existing septic system (if on septic), Erlanger may require a professional engineer to design the plumbing system and a soil assessment. Karst limestone substrate in Erlanger can pose drainage challenges, so a drain-field expansion or new septic system may be necessary—this adds cost and timeline. Owner-builders are allowed for owner-occupied homes in Kentucky, but Erlanger inspectors often request licensed plumber and electrician sign-offs for additions due to code complexity.

Building permit + plumbing permit + electrical permit (multi-permit addition) | Site plan review required (setback, lot coverage, zoning compliance) | New construction code (not remodel exemptions) | Structural framing + plumbing + electrical + final inspections (6+ inspections) | Permit fees $800–$1,500 total | Property tax increase post-permit | Total project $20,000–$40,000

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Waterproofing assemblies: what Erlanger inspectors demand

Erlanger's Building Department is explicit in enforcing IRC R702.4.2 (shower and tub water-resistive barriers). The code requires a continuous membrane or waterproof substrate on the stud framing before any tile is installed. The three assemblies that pass Erlanger inspection are: (1) cement board (1/2-inch minimum) plus a sheet waterproofing membrane (RedGard, Kerdi, Aqua Defense, Noble Seal—any brand rated for continuous water immersion); (2) pre-made waterproof backer board (Schlüter-KERDI-BOARD, Durock Cement Board + membrane, Hardibacker + membrane); or (3) liquid-applied waterproofing membrane over gypsum board (rare, but allowed if product data sheet shows continuous water coverage and the substrate is appropriately rated). Erlanger does NOT accept unprotected drywall, greenboard alone, or partial waterproofing (e.g., waterproofing only the tub surround but not the shower wall). The membrane must extend 6 inches above the rim of a tub and the full height of a shower enclosure, including 6 inches beyond the threshold on the bathroom floor.

When you submit your permit plan to Erlanger, include a detail section drawing at 1:4 or 1:8 scale showing the waterproofing assembly cross-section. Label the studs, waterproofing membrane (with product name and thickness), substrate, and tile layer. For example: '2x4 studs, 16 inches on center, Kerdi-Board 10mm waterproof substrate adhered to studs per Schlüter-Systems installation manual, Kerdi waterproofing membrane seams sealed with Kerdi-Fix adhesive, 1/4-inch tile with modified thin-set mortar.' Include a reference to the manufacturer's installation guide on the plan. Erlanger staff may contact you for clarification if the detail is vague or incomplete, which delays permit review by 1–2 weeks. Having the exact assembly pre-approved avoids this delay.

Erlanger inspectors perform a waterproofing inspection before drywall or tile is installed. The inspector verifies that the membrane is properly installed, seams are sealed, and the assembly extends to the required heights. If you've used a cement-board-plus-membrane assembly, the inspector checks that the cement board is fastened per the fastener schedule (usually 1.5-inch corrosion-resistant nails or screws every 8 inches on studs and blocking), and the membrane is adhered without gaps or wrinkles. If the inspection fails (e.g., sealed seams are found or the membrane height is short of code), you must remediate and re-inspect before proceeding. This can add 1–2 weeks to the schedule, so quality control during installation is critical. Some Erlanger inspectors request photographs of the waterproofing before the final inspection, so take site photos during rough-in and keep them in a file.

Plumbing fixture relocation in Erlanger: drain and vent rules

Relocating a plumbing fixture (toilet, sink, shower) in an Erlanger bathroom remodel is the most common permit trigger because it requires new drain and vent piping. The ICC/IRC plumbing code (which Kentucky and Erlanger adopt) has strict rules on drain slopes, trap arms, and vent termination, and Erlanger inspectors enforce these rules precisely because failures lead to sewer backups and water damage. The most frequently violated rule is trap-arm length: IRC P2706.1 limits the horizontal distance from a fixture trap to the vent stack (or where the vent rises vertically from a vertical drain) to 6 feet. If your relocated toilet drain runs 8 feet horizontally to the vent, the trap will siphon and fail inspection. Erlanger inspectors measure this distance on rough plumbing and reject oversized trap arms. The fix requires re-routing the drain or installing a secondary vent (revent loop), both costly mid-project changes. To avoid this, have your plumber calculate and show trap-arm distances on the plumbing plan before you submit for permit.

Drain slope is another frequent failure point in Erlanger inspections. All gravity drains in a bathroom (toilet, sink, shower) must slope toward the main stack at a minimum of 1/4 inch per foot (rise of 1 inch for every 4 feet of horizontal run). Too shallow a slope causes water to pool in the drain line; too steep (more than 3/4 inch per foot) causes solids to separate from water and clog. Erlanger inspectors use a level or slope gauge on the rough drain line to verify compliance. If the slope is incorrect, the line must be re-routed before closing walls. For shower drains specifically, the drain pan must slope toward the drain opening at 1/4 inch per foot minimum, and the floor framing must be set to accommodate this slope—this is a design consideration that must be shown on your framing plan or plumbing plan.

Vent stack placement and termination is Erlanger's final plumbing checkpoint. Every fixture drain must be vented (either via a main vent stack or a revent loop) to prevent trap seal loss. The vent must terminate above the roof (or through a gable wall) at least 12 inches above the highest roof line and at least 10 feet from any window, door, or air intake per IRC P3103. In climate zone 4A, Erlanger specifically disallows vent termination into soffit vents, gable vents, or attic spaces because snow and ice can clog the vent opening and trap water in the drain. Your plumbing plan must show the vent route from the fixture trap to the termination point, with the termination location labeled clearly (e.g., 'Roof vent cap at east roof slope, 2 feet above peak'). If the vent route is unclear or terminates in a disallowed location, the permit will be rejected or delayed. Have your plumber mark the vent location on the roof in person with the inspector before finalizing the rough-in.

City of Erlanger Building Department
Contact Erlanger City Hall, Erlanger, KY 41018 (verify street address locally)
Phone: Search 'Erlanger KY building permit phone' or call Erlanger City Hall main line | https://www.erlanger.ky.us (check 'Building/Permits' section for online portal)
Monday–Friday, 8:00 AM–5:00 PM (verify with city)

Common questions

Do I need a permit if I'm just replacing my toilet, faucet, and vanity in the same spots?

No. Replacing fixtures in their existing locations is surface-only cosmetic work and does not require a permit in Erlanger. Plumbing connections to existing supply and drain stubs do not trigger permit requirements. However, if your home was built before 1978 and you disturb more than 20 square feet of paint (e.g., scraping old tile adhesive), you must follow EPA lead-safe practices even without a permit.

I'm converting my tub to a shower. Do I really need a permit for that?

Yes. Tub-to-shower conversion requires a permit because it changes the waterproofing assembly (IRC R702.4.2). The new shower enclosure must have a continuous water-resistive barrier (membrane or waterproof substrate) that differs from the existing tub surround. You must submit a waterproofing detail drawing showing the assembly (cement board + membrane, Kerdi-Board, or liquid-applied membrane) before the permit is issued. Plan-review turnaround is 2–4 weeks in Erlanger.

Can I move my toilet to the opposite wall if I redo the plumbing?

Yes, but the new drain and vent piping must meet code. The trap arm (horizontal run from the toilet trap to the vent stack) cannot exceed 6 feet per IRC P2706. If your new location would require an 8-foot trap arm, you'll need a secondary vent (revent loop), which costs extra. Have your plumber verify the trap-arm distance before you submit the permit plan to avoid rejection or costly mid-project changes.

What happens if I install a new exhaust fan without a permit?

You risk a stop-work order and a $250–$500 fine from Erlanger if the unpermitted work is discovered. Exhaust fans require a permit because the ductwork must vent outdoors (not into the attic) per IRC M1505, and Erlanger specifically disallows soffit or gable venting in climate zone 4A due to ice damming risks. If the fan is improperly vented, it can cause moisture damage. You'll also need a GFCI-protected circuit and may owe double permit fees if you have to pull the permit retroactively.

Do I need to hire a licensed plumber or electrician, or can I do the work myself?

Owner-builders are allowed in Kentucky for owner-occupied homes, so you can pull the permit yourself and do some of the work if you're competent. However, Erlanger inspectors often recommend or require licensed plumber and electrician sign-offs for bathroom plumbing and electrical rough-in because code compliance is complex. Hiring licensed trades also protects your homeowner's insurance and resale disclosures. Check with Erlanger Building Department about their specific requirements for owner-builder bathroom work.

How much does a bathroom remodel permit cost in Erlanger?

Permit fees in Erlanger are typically 1.5–2% of the declared project valuation. A $15,000 bathroom remodel pays $225–$300 in permit fees; a $25,000 remodel pays $375–$500. The fee includes plan review, permit issuance, and one set of inspections. If you fail an inspection and need a re-inspection, expect an additional $50–$75 fee. Fees may vary slightly; contact Erlanger Building Department for the current fee schedule.

I'm adding GFCI outlets in my bathroom. Is there a separate electrical permit?

GFCI protection is required on all bathroom outlets and lighting circuits per the National Electrical Code (NEC 210.8). Erlanger does not issue a separate 'GFCI permit,' but electrical work (adding new circuits, installing GFCI breakers, or extending circuits) is covered under the main plumbing/remodel permit. You must show GFCI and AFCI breaker labels on your electrical plan during permit review. If you're only replacing an existing outlet with a GFCI receptacle in-place (no new wiring), no permit is required.

Will I need a lead-safe work permit if my bathroom was built in the 1970s?

No separate lead permit is required in Erlanger. However, if your home was built before 1978 and you disturb more than 20 square feet of paint or lead-bearing materials (per EPA 40 CFR Part 745), you must follow lead-safe practices (wet methods, dust containment, certified disposal). If you hire a contractor, they must be EPA-certified for lead-safe renovation. This applies even if you don't pull a building permit—it's a federal rule that Erlanger enforces at inspection or via EPA complaints.

How long does it take from permit issue to final inspection in Erlanger?

A typical bathroom remodel in Erlanger takes 3–8 weeks from permit issue to final inspection, depending on the complexity and the number of required inspections. Simple cosmetic work (not permitted) is done in days. A full gut with fixture relocation, electrical, and waterproofing usually requires rough plumbing, rough electrical, waterproofing, and final inspections—typically 4–6 weeks of actual work with 1–2 weeks between inspections for remediation if needed. Plan-review time (2–4 weeks before the permit is issued) is separate, so budget 6–12 weeks total from application to final sign-off.

What's the most common reason bathroom remodels get rejected at permit review in Erlanger?

Missing or vague waterproofing specifications. Erlanger requires a detailed assembly drawing (substrate, membrane, product names, thicknesses, and installation standard) before the permit is issued. Submitting a plan that says 'waterproofing per code' or doesn't show a cross-section causes a rejection and a 1–2 week delay for resubmission. The second most common rejection is missing electrical plan details (no GFCI or AFCI labels) and vent termination location not shown on the plumbing plan. Spending 30 minutes on a clear, detailed plan saves weeks in review.

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 Erlanger Building Department before starting your project.

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