Bathroom Remodel Permit in Key West, FL (2026)

Research by DoINeedAPermit Research Team · Updated May 2026

The Short Answer

A full bathroom remodel in Key West requires a permit if you relocate any plumbing fixture, add electrical circuits, install new ventilation, or move walls. Surface-only work (tile, vanity swap in place, faucet replacement) does not need a permit.

Key West applies Florida Building Code (currently 2023 FBC, which mirrors IBC 2021 + state amendments) and enforces it strictly because the city sits in a corrosion-prone coastal zone with high humidity, salt spray, and limestone-karst foundation challenges that make waterproofing failures catastrophic. The City of Key West Building Department processes bathroom permits through an online portal and requires sealed plans for any work involving fixture relocation, new electrical branch circuits, or exhaust-fan ductwork — even minor ones. Unlike some Florida cities that rubber-stamp smaller projects, Key West's plan reviewers flag every missed detail: shower waterproofing membrane specifications, GFCI outlet placement, exhaust-fan duct termination height (must clear roof per FBC R1502.9), and trap-arm lengths on relocated drains. The city's turnaround on bathroom-remodel permits is typically 2–3 weeks if plans are complete, but re-submits for missing details add 1–2 weeks each. Permit fees run $250–$700 depending on valuation, plus separate inspection fees ($50–$100 per inspection). Key West also enforces lead-paint disclosure and containment rules for pre-1978 homes, which adds cost and timeline if your home was built before that year.

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

Stop-work orders in Key West carry $500–$1,500 fines, plus the city will force removal of unpermitted work and require re-pulling a permit at double the standard fee before any certificate of occupancy.
Insurance claim denials: most homeowners policies void coverage if bathroom plumbing or electrical work was done without a permit, leaving you liable for water damage or electrical fires that exceed $25,000–$50,000.
Seller's disclosure hit: Florida requires bathrooms altered without permits to be disclosed on the Property Condition Disclosure form; unpermitted work can reduce resale value by 5–15% and kill deals outright.
Lender and refinance block: mortgage companies and appraisers in Monroe County flag unpermitted bathroom remodels and will not close unless work is permitted and inspected retroactively (cost $1,000–$3,000 to remediate).

Key West bathroom remodel permits — the key details

The threshold for a permit in Key West is straightforward: any work that moves a fixture, changes electrical circuits, modifies ventilation, or alters the structure requires a permit application filed with the City of Key West Building Department. The Building Code Adoption by Reference (Key West Municipal Code Chapter 8-2) applies Florida Building Code 2023, which incorporates IRC P2706 (drain-trap arm limits), IRC E3902 (GFCI protection in bathrooms), IRC M1505 (exhaust-fan sizing and termination), and IRC R702.4.2 (waterproofing assembly for wet areas). If you are only replacing a toilet, faucet, vanity, or tile in the exact same location — swapping in-place, no plumbing relocation, no wall movement — a permit is not required. However, the moment you move a toilet to a new wall, extend the drain line, relocate a sink, or change the vent-fan ductwork, a permit is mandatory. Key West's coastal humidity (average 75% year-round) and limestone-foundation substrate mean moisture failures are far more costly than in inland Florida; the city's inspector corps is therefore vigilant about waterproofing systems, and inadequate or unspecified shower waterproofing is the number-one plan-rejection reason for bathroom remodels.

Electrical work in bathrooms triggers mandatory GFCI and AFCI protection per FBC 2023 (mirroring NEC 2020). Every outlet within 6 feet of a sink or tub must be GFCI-protected; if you add a new circuit (e.g., a 20-amp dedicated circuit for a heated mirror or towel warmer), the entire circuit must be on AFCI protection. Key West's online permit portal requires a single-line electrical diagram showing all outlet locations, circuit breakers, and GFCI/AFCI specifications; many DIYers omit this diagram and face a mandatory re-submission. The bathroom exhaust fan must be sized per ASHRAE 62.2 or Table M1505.2: a standard 5x8-foot bathroom requires a minimum 50-CFM fan (or 20-minute air changes per hour, whichever is greater). The ductwork must terminate to the exterior (not the attic or crawl space), with a damper and termination cap. Key West's humidity makes improperly ducted fans a mold risk; the city's inspector will verify duct size (minimum 4 inches) and termination height during rough-in inspection.

Plumbing relocation in bathrooms is subject to trap-arm limits and slope requirements that trip up many homeowners. IRC P2706 limits trap-arm length to 24 inches for drains 2 inches or smaller (common for sinks) and 48 inches for 3-inch or 4-inch drains (toilets). If your relocated sink is more than 24 inches from the wall it drains into, the vent stack must be relocated too — a detail that adds cost and complexity. Tub-to-shower conversions (or vice versa) require a change to the waterproofing assembly. If you are converting a tub to a shower, the wall behind the new shower must have a full waterproofing membrane (cement board + liquid waterproof membrane, or equivalent); the old tub surround (often just tileboard) is not sufficient. The membrane must extend 6 inches above the showerhead and 12 inches above the tub rim. Key West's inspector will demand a photo or specification sheet proving the membrane meets ANSI A118.10 or ASTM C1028 standards; many contractors use cheap membranes that fail in salt-spray conditions and are flagged during rough framing inspection.

The permit process in Key West starts with submitting plans online through the city's portal (or in person at City Hall, 510 Greene Street, Key West, FL 33040). Plans must include a floor plan showing fixture locations, a plumbing isometric or riser diagram showing drain/vent routing, an electrical single-line diagram with outlet locations and circuit breakers, and a note on the waterproofing system (e.g., 'DensShield + Hydro Ban membrane' or equivalent). Most bathroom remodels are reviewed as 'standard plans' and take 2–3 weeks; if the reviewer flags issues (missing GFCI notes, duct termination not shown, trap-arm length exceeded), resubmission adds another 1–2 weeks. The permit fee is based on project valuation: a $15,000 bathroom remodel typically costs $300–$450 in permit fees; a $30,000 remodel costs $500–$700. Once the permit is issued, you are required to call for three inspections: rough plumbing (after walls are opened but before drywall), rough electrical (same timing), and final (after everything is closed in and fixtures are installed). Each inspection costs $50–$100 and must be scheduled at least 24 hours in advance through the city's online system or by phone.

Pre-1978 homes in Key West trigger lead-paint rules under Florida Statutes § 404.056 and federal EPA RRP Rule. If your bathroom was built before 1978, any renovation that disturbs more than one square foot of paint requires lead-safe work practices: containment, HEPA-filtered vacuuming, and waste disposal per EPA guidelines. The contractor (if licensed) or the homeowner (if owner-builder) must be lead-safe certified; certification costs $300–$500 and takes 8 hours. Failure to follow lead-paint rules in pre-1978 homes carries $16,000–$32,000 in federal fines and potential liability if dust contaminates the home. Key West's inspector will ask for proof of lead certification during permit issue or at rough-in; have your certification card ready. If you are doing the work as an owner-builder (allowed under Florida Statutes § 489.103(7) for homeowners on their own primary residence), you do not need a contractor license, but you still must follow all code rules, obtain permits, pass inspections, and comply with lead-paint rules if applicable.

Three Key West bathroom remodel (full) scenarios

Scenario A

Toilet and sink relocated to new walls, same bathroom footprint — Old Town bungalow, 1950s

You are gutting a 5x7-foot bathroom in a 1954 Old Town bungalow and moving the toilet to the opposite wall (16 feet from the current drain stack) and the sink to an adjacent wall (12 feet from the vent). The toilet relocation requires a new 3-inch drain line (slope minimum 1/4 inch per foot per IRC P2706) and a new 2-inch vent stack that must tie into the main vent above the roof; the sink relocation requires a new 1.5-inch drain and an auxiliary vent (because the trap-arm will exceed 24 inches). Because the home was built in 1954, you must comply with lead-paint containment rules: seal the bathroom, use HEPA-filtered tools, and dispose of dust in EPA-approved bags ($300–$500 for lead-safe containment supplies). Your permit application must show a plumbing isometric diagram with drain slopes, vent-stack routing, and trap-arm lengths labeled, plus a note that lead-safe practices will be followed. The city's plan reviewer will likely ask for clarification on the vent routing (can the new vent tie into the existing main stack, or must a new one be run?) and will verify the drain slope is achievable given the 16-foot run. Expect 2–3 weeks for plan review, then rough-plumbing inspection (inspector checks drain slope with a level and vent termination above roof), rough electrical inspection (GFCI outlets, AFCI circuit breaker if new circuits added), and final inspection (all fixtures, caulk, grout). Total permit cost: $350–$500. Total project cost: $8,000–$15,000 (plumbing $3,000–$5,000, electrical $1,500–$2,500, finishes/tile $3,000–$7,000).

Scenario B

Tub-to-shower conversion with new waterproofing, same wall location — Bahama Village renovated condo, post-1978

You are converting an existing bathtub to a walk-in shower in a 2000 post-1978 condo in Bahama Village. The new shower will be 3x4 feet, tiled, with a curb drain. Because the waterproofing assembly is changing (old tub surround was adhesive-backed drywall, not a waterproof membrane), the wall must be rebuilt with cement board and a liquid waterproof membrane (DensShield or equivalent per ANSI A118.10). The membrane must extend 6 inches above the showerhead and 12 inches above the curb. The drain-line from the tub already exists and will be reused (no new plumbing relocation), so you only need to show the waterproofing specification in your permit plans. No lead-paint issues (post-1978), but you must specify the waterproofing product and include a product data sheet in your application. Key West's plan reviewer will request the exact waterproofing system (brand and model) and will scrutinize it because salt-spray corrosion is a major issue in the Keys; weak or unproven membranes are flagged immediately. Expect 1–2 weeks for plan review (shorter than a full remodel because no plumbing or electrical work). Inspections: framing/waterproofing rough-in (inspector verifies cement board is installed correctly and membrane is applied per manufacturer specifications, often with photos), and final (tile, caulk, fixtures). Permit cost: $250–$350. Total project cost: $4,000–$8,000 (demo $500–$1,000, waterproofing + framing $1,500–$2,500, tile/finish $2,000–$4,500).

Scenario C

Vanity and faucet swap in place, new exhaust fan with new ductwork — Solares Hill single-family home, 1970s

You are replacing an aging vanity and faucet in a 1970s Solares Hill home with a new 30-inch vanity in the same location (no plumbing relocation, just in-place swap). However, the existing exhaust fan is ducted into the attic (a code violation), and you want to install a new, properly ducted fan that vents through the roof. Because you are adding new ventilation ductwork that changes the mechanical system, a permit is required. The new fan must be sized per ASHRAE 62.2: for a typical 5x8-foot bathroom, a 50-CFM fan is minimum. The duct must be 4 inches minimum, must slope toward the exterior, and must terminate above the roof with a damper and termination cap (FBC R1502.9). Because the home was built in 1970, lead-paint rules apply to any wall opening (e.g., cutting a hole in the wall to route ductwork or access the attic); you must use lead-safe containment. Your permit application must include a bathroom floor plan showing the new fan location, duct routing, and roof termination point, plus a specification for the fan (brand, model, CFM rating). Expect 2–3 weeks for plan review (reviewer will verify duct size, termination height, and GFCI outlet protection near the sink). Inspections: rough mechanical (inspector checks duct size and slope), rough electrical (GFCI outlet, AFCI circuit if new circuit), and final (fan operational, duct sealed, roof penetration flashed). Permit cost: $300–$400. Total project cost: $2,500–$5,000 (vanity $400–$800, faucet $200–$500, exhaust fan + ductwork $1,200–$2,000, roofing penetration/flashing $300–$700, lead containment $300–$500).

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Waterproofing standards in Key West: why the city is so strict about shower membranes

Key West's climate and environment make waterproofing failures catastrophic in ways that inland Florida homes do not face. The island sits in a coastal salt-spray zone (ASTM C1480 Zone 5, highest corrosion severity), with average humidity above 75% year-round and limestone-karst subsurface that amplifies moisture problems. When a shower membrane fails in an inland city, you get drywall rot and mold; in Key West, salt-laden moisture penetrates the concrete and limestone foundation, corroding rebar and pilings that can undermine the structural integrity of the home. The city's building inspector corps is therefore obsessive about waterproofing specifications: they will reject a shower design that uses adhesive-backed drywall or tileboard without a full membrane backing, and they will demand product data sheets proving the chosen waterproofing system meets ANSI A118.10 or ASTM C1028 salt-spray performance standards.

The Florida Building Code 2023 (FBC R702.4.2) requires a moisture barrier behind tub and shower areas, but Key West goes further: the city's interpretive guidance (available on the building department website or upon request) specifies that moisture barriers must be liquid membranes or waterproofing boards rated for high-humidity and salt-spray environments. Cheap acrylic membranes that work inland will fail in Key West within 3–5 years. Approved systems include DensShield TB (cement board + liquid membrane), RedGard, Hydro Ban, Kerdi, and equivalent products; the inspector will ask for the product name and model during framing inspection and will verify it is installed per manufacturer specs. If your shower design uses an unapproved product or if the membrane is not shown in your permit plans, the city will reject the rough-framing inspection and require remediation, adding 1–2 weeks to the timeline.

Cost implications: a proper salt-spray-rated waterproofing system in a 3x4-foot shower costs $400–$800 in materials and labor, whereas a cheap acrylic membrane costs $150–$250. Many contractors cut corners to save $200–$300 per job, but in Key West that shortcut will result in a failed inspection and a re-do that costs triple. Homeowners pursuing full bathrooms remodels should budget for premium waterproofing upfront and should verify in the contractor estimate that a named, FBC-compliant membrane is specified.

Electrical and GFCI requirements in Key West bathrooms: why the city flags missing outlet details

Every outlet in a bathroom — not just those within 6 feet of a sink or tub — must be GFCI-protected per FBC 2023 Article 9 (mirroring NEC 2020). Any new circuit added to a bathroom (e.g., a 20-amp dedicated circuit for a heated mirror, towel rack, or ventilation fan) must be on an AFCI (arc-fault circuit interrupter) breaker, not just a standard breaker. The difference: GFCI detects ground faults (leakage through water or moisture); AFCI detects arc faults (sparking in damaged wire or connections). Key West's inspector will review your electrical single-line diagram during plan review and will flag any outlet or circuit that is not labeled GFCI or AFCI. If you fail to show GFCI/AFCI protection in your permit plans, the city will reject the plan and require resubmission; even minor omissions trigger re-do.

The practical implication: if your bathroom already has a GFCI-protected outlet (either a GFCI outlet itself or a circuit protected by a GFCI breaker in the main panel), you can plug additional outlets into it and they will all be protected — no need to run new circuits. However, if you are adding a new circuit (e.g., because the existing circuits are overloaded or you want a dedicated circuit for a high-draw device), you must specify an AFCI breaker in the main panel and show it on your electrical plan. The permit reviewer will verify the breaker is the correct amperage (typically 15 or 20 amps for bathroom circuits) and will note it on the approved permit plan. During rough-electrical inspection, the inspector will verify the GFCI/AFCI outlet or breaker is installed and will test it with a GFCI test device.

Cost: a GFCI outlet costs $15–$30; a GFCI breaker costs $40–$80. If you are adding a new circuit, you must also run new wire (14-gauge for 15-amp, 12-gauge for 20-amp) from the main panel to the bathroom, which costs $300–$800 depending on distance and complexity. Many homeowners underestimate this cost and are shocked when the electrician quotes $1,200–$2,000 for a new dedicated circuit including wire, breaker, and outlets. Budget accordingly.

City of Key West Building Department
510 Greene Street, Key West, FL 33040 (City Hall)
Phone: (305) 292-8146 (Building Permits division) | https://www.cityofkeywest.us/departments/building (permit portal and documents)
Monday–Friday, 8:00 AM – 5:00 PM (closed weekends and city holidays)

Common questions

Do I need a permit if I am just replacing a toilet and vanity in the same spot?

No. If the toilet and vanity are being replaced in their exact original locations with no plumbing-line relocation, no wall movement, and no new electrical circuits, a permit is not required. However, if you move either fixture to a different wall or location, a permit is mandatory. The City of Key West Building Department draws a clear line: fixture swaps in place are exempt; fixture relocations require a full permit with plan review and inspections.

What is the most common reason the City of Key West rejects bathroom-remodel plans?

Missing waterproofing specifications. Plans must show the exact waterproofing product (e.g., DensShield + Hydro Ban, Schluter Kerdi) and must include a product data sheet proving it meets ANSI A118.10 or equivalent salt-spray standards. Key West's coastal environment makes weak membranes catastrophic; the inspector will not approve a plan without a named, high-performance system. Second most common: GFCI/AFCI outlet and breaker protection not labeled on the electrical diagram.

Can I do a full bathroom remodel as an owner-builder, or do I need to hire a licensed contractor?

You can do the work as an owner-builder on your own primary residence under Florida Statutes § 489.103(7). You do not need a contractor license, but you must obtain a permit, follow all code requirements, pass all inspections, and comply with lead-paint rules if the home was built before 1978. Many homeowners hire a licensed plumber and electrician for those specific scopes while doing the demolition and finishing (tile, paint) themselves; this is a common and cost-effective approach.

How long does a bathroom-remodel permit typically take in Key West?

If plans are complete and correct, 2–3 weeks for plan review. If the reviewer flags issues (missing waterproofing specs, GFCI details, duct termination not shown), resubmission adds 1–2 weeks. Once the permit is issued, inspections (rough plumbing, rough electrical, final) can often be scheduled within 1–2 weeks, but coordinating with your contractor's schedule typically extends the total timeline to 4–6 weeks from submission to certificate of occupancy.

Do I need to provide a plumbing isometric or riser diagram if I am not relocating any pipes?

No. If you are only replacing fixtures in place (toilet, sink, faucet, vanity), no new vents, and no drain relocation, you do not need a plumbing diagram. However, if you move any fixture or add a new exhaust fan, you must provide a clear diagram showing drain routing, vent stacks, trap-arm lengths, and slopes (minimum 1/4 inch per foot). The diagram can be hand-drawn or CAD; it must be legible and dimensioned.

What is the cost of a full bathroom-remodel permit in Key West?

Permit fees are based on project valuation and typically range from $250–$700. A $15,000 remodel (fixture relocation, new tile, waterproofing) costs about $350–$450 in permit fees. A $30,000+ remodel costs $550–$700. Inspection fees are additional ($50–$100 per inspection, typically 3–4 inspections). Always call the Building Department to confirm the exact fee for your project scope before submitting.

My home was built in 1975. Do I have to follow lead-paint rules for a bathroom remodel?

Yes. Any renovation that disturbs more than one square foot of paint in a pre-1978 home triggers EPA RRP Rule and Florida Statutes § 404.056. You must use lead-safe work practices (containment, HEPA-filtered tools, proper disposal). The contractor or homeowner must be lead-safe certified ($300–$500, takes 8 hours online). Failure to comply can result in $16,000–$32,000 federal fines. The City of Key West inspector will ask for proof of certification during permit issue or at rough-in.

Can I duct my bathroom exhaust fan into the attic instead of through the roof?

No. FBC R1502.9 requires bathroom exhaust fans to terminate to the exterior, not the attic. Ducting into the attic is a code violation and will fail inspection; the city inspector will require you to relocate the ductwork to the roof with a proper damper and termination cap. Attic ducting causes moisture buildup, mold, and structural damage — especially in Key West's humid climate. Budget for the cost of rerouting the duct through the roof during your planning.

What happens if the plan reviewer asks for more information after I submit?

The city will send you a Request for Information (RFI) email listing the missing or unclear details. You have 10 business days to respond with clarifications, revised plans, or product data sheets. Most RFIs are resolved with email responses (no need to resubmit full plans); a few require revised drawings. Once you respond, the reviewer takes another 3–5 business days to re-examine. Plan on 1–2 weeks additional timeline if you receive an RFI.

Do I need a separate permit for painting and tile work, or is that included in the bathroom-remodel permit?

Painting and tile work are included in the bathroom-remodel permit; no separate permit is needed. However, if you are applying waterproofing membranes and tile, the waterproofing system must be specified in your plans and must pass rough-framing inspection before you tile. Tile itself is not inspected, but the substrate (cement board, waterproofing) is. Once framing inspection passes, you can tile and paint without further inspections.

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 Key West Building Department before starting your project.

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