Bathroom Remodel Permit in Farmington, UT (2026)

Research by DoINeedAPermit Research Team · Updated May 2026

The Short Answer

A full bathroom remodel in Farmington requires a permit if you're relocating plumbing fixtures, adding electrical circuits, installing new exhaust fans, converting tub to shower, or moving walls. Surface-only cosmetic work (tile, vanity swap in place) does not require a permit.

Farmington Building Department follows the 2024 International Residential Code (or the version adopted by Davis County/State of Utah — verify which cycle Farmington has officially adopted, as some Utah municipalities lag 1-2 code cycles). The city's key distinction from neighboring communities like Kaysville or Laguna is its enforcement of the Wasatch Fault seismic overlay: any bathroom remodel involving framing or structural changes must include seismic-bracing callouts for fixtures and mechanical equipment, which the city's plan-review team specifically flags. Farmington also applies stricter waterproofing documentation than some neighbors — you cannot simply note 'cement board and membrane' without specifying the membrane product (ASTM D6135 or equivalent) on the permit drawings. Bathroom electrical work triggers both GFCI requirements (all circuits within 6 feet of sink per NEC 210.8) and, if you're running new circuits from the main panel, AFCI protection on bedroom circuits — a detail that surprises many homeowners. The city's online permit portal is limited; most bathroom permits still require in-person submission at Farmington City Hall or certified mail with drawings, which adds 1-2 weeks to intake versus nearby Sandy's fully digital portal.

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

Stop-work orders issued by Farmington Building Inspector cost $500–$1,200 in fines, plus you must pull a permit retroactively at double the standard fee once inspections resume.
Insurance claim denial: if a water leak or electrical fault occurs in unpermitted bathroom work, homeowner's insurance will deny the claim; water damage to flooring/subfloor can exceed $15,000.
Title/resale disclosure: Utah Code requires sellers to disclose unpermitted work; a full bathroom remodel discovered at closing can kill the sale or force a $10,000–$30,000 price reduction.
Lender/refinance blocking: Utah mortgage lenders routinely order building-permit audits during refinance; unpermitted structural or electrical work can suspend the loan for 60+ days or be rejected outright.

Farmington bathroom-remodel permits — the key details

Farmington Building Department requires a permit for any bathroom remodel that involves fixture relocation, new electrical circuits, new exhaust-fan ductwork, wall removal, or a tub-to-shower conversion. The city cites IRC P2706 (drainage and trap sizing), IRC E3902 (GFCI protection), and IRC M1505 (exhaust-fan ventilation and termination) as the primary code drivers. What trips up homeowners is the exhaust-fan rule: if you're installing a new fan or relocating an existing one, the duct must terminate through the exterior wall or roof (not into the attic — a common shortcut in older Farmington homes) and the duct diameter and run length must match the fan's CFM rating. A typical bathroom (5x8 ft) needs 80 CFM minimum (IRC M1505.2); if your duct run exceeds 25 linear feet, you must upsize the duct or use an in-line booster fan, which adds $200–$400. The city's plan-review process takes 2–5 weeks for a full bathroom remodel because the reviewer checks plumbing trap arms, electrical layout, waterproofing assembly, and (crucially) seismic bracing callouts for the toilet, sink, and water-heater strapping if applicable.

Waterproofing is the second-most-cited rejection in Farmington bathroom permits. If you're converting a tub to a shower or vice versa, IRC R702.4.2 requires a water-resistant or fully waterproof assembly. The code allows three paths: (1) cement board + liquid-applied membrane per ASTM D6135, (2) Kerdi or equivalent sheet membrane, or (3) tile-board liner systems rated per ANSI A118.10. Farmington's plan-review team will not approve a permit with vague notes like 'cement board and waterproofing' — you must specify the product name, ASTM standard, and installation details (membrane sealing at all penetrations, overlap widths, etc.). Many homeowners assume any membrane is acceptable; in reality, cheap polyethylene or roofing felt does not meet code. The city occasionally requires a third-party waterproofing installer to sign off on the assembly before final inspection, especially if you're hiring a general contractor unfamiliar with Utah code. This adds $150–$300 and delays the project 1–2 weeks.

Electrical work in Farmington bathrooms must satisfy NEC Article 210.8(A)(1): all receptacles within 6 feet of the sink (measured horizontally) require GFCI protection. If you're adding a new circuit for a heated floor mat, towel warmer, or ventilation fan, that circuit must originate from the main panel with AFCI (arc-fault circuit interrupter) protection if it's a bedroom circuit, or standard GFCI if it's a bath-only circuit. Farmington Building Department requires a one-line electrical diagram showing all circuits, breaker sizes, and GFCI/AFCI locations; this is non-negotiable. If you're replacing an existing outlet in place without adding new circuits, no permit is required for that single swap — but if you're moving the outlet or adding a second one, a permit is triggered. The confusion arises because homeowners often hire an electrician who installs a new outlet and wires it off an existing circuit without pulling a permit, assuming it's 'just one outlet.' Farmington's electrical inspector will catch this during other inspections or if a neighbor reports unpermitted work. The standard permit fee for bathroom electrical work is $150–$250, but retroactive or unpermitted work can double the fee.

Seismic bracing, unique to Farmington's Wasatch Fault overlay zone, is not optional. The city requires that any bathroom remodel involving framing, fixture relocation, or mechanical equipment must include bracing callouts or straps for the toilet flange, sink pedestal (or vanity bolting), and any gas water heaters or furnaces in adjacent spaces. This is a requirement that many contractors from outside the Wasatch Front forget or downplay. Farmington's plan-review checklist explicitly lists 'seismic restraints per IBC Section 1705.8' for plumbing fixtures. In practice, this means: toilet bolts must be stainless steel and rated for seismic movement; sink vanities must be bolted to studs; water heaters must be strapped with two bands minimum. The cost to a homeowner is minimal (perhaps $50–$150 in extra materials), but failure to call it out on the permit drawings is a quick rejection. The city will ask you to revise and resubmit, which delays the project 1–2 weeks.

The permit application process in Farmington is mostly in-person or by mail; the city does not have a full online portal like some larger Utah cities. You must submit two sets of drawings (or digital prints) with your application, a completed application form, and the permit fee. Drawings must show: floor plan with fixture locations and dimensions, plumbing rough-in (trap locations, vent-stack routing, shut-off valves), electrical plan (outlet locations, circuit breaker assignment, GFCI/AFCI callouts), and waterproofing assembly (for tub/shower conversions). The fee is based on the estimated cost of work: for a typical $12,000–$20,000 full bathroom remodel, you'll pay $300–$600 in permit fees (often 2.5–3% of project valuation). Inspections are typically four: rough plumbing, rough electrical, framing/drywall (if walls are being removed), and final. The total timeline from permit submission to final sign-off is 6–10 weeks, assuming no rejections. Owner-builders are allowed in Farmington for owner-occupied homes, but you must still pull the permit in your name and pass all inspections; hiring an unlicensed plumber or electrician does not exempt you from the permit.

Three Farmington bathroom remodel (full) scenarios

Scenario A

In-place vanity and toilet swap, new tile — Lagoon View neighborhood, no fixture relocation

You're replacing a 30-inch vanity with a 36-inch vanity in the same location, replacing the toilet with a low-flow model in the same spot, and re-tiling the walls above the tub with new ceramic tile (keeping the tub in place). This is surface-only cosmetic work and does NOT require a Farmington permit. The new vanity drain still uses the existing trap arm and doesn't require plumbing re-routing; the toilet flange remains at the same location; the tile is new finish material, not a waterproofing-assembly change because the tub remains. However, confirm that the new vanity's counter depth doesn't shift the sink location horizontally — if you're moving the sink bowl 6+ inches, the trap arm length changes and you may trigger a permit. Also, if you notice the old tile has water damage or soft drywall behind it, stopping to fix the underlying waterproofing turns this into a permitted tub-to-shower conversion or wet-wall rebuild. The cost is approximately $4,000–$8,000 (vanity $800–$1,500, toilet $300–$600, tile labor $2,500–$4,000, removal $500–$1,000), and you can proceed without a permit or inspection. This scenario is common for homeowners in Farmington's older neighborhoods (Lagoon View, Sunset) where cosmetic updates are preferred over full guts.

Scenario B

Tub-to-shower conversion, new exhaust fan duct through exterior wall — Sandhollow subdivision, owner-builder

You're removing the bathtub, installing a walk-in shower with cement-board backing and liquid-applied membrane, and adding a new 80-CFM exhaust fan with ductwork terminating through the north exterior wall (approximately 12 linear feet of duct run). This triggers a Farmington permit because: (1) the waterproofing assembly changes from tub surround (which may have been vinyl or tile-only) to a code-compliant shower assembly per IRC R702.4.2, (2) the new exhaust fan requires ductwork and duct-termination documentation (IRC M1505.3), and (3) you're moving or adding mechanical/plumbing equipment in the bathroom. Farmington's seismic-overlay requirement applies: your permit drawings must show bracing or restraint callouts for the new shower valve (pressure-balanced, per code) and the exhaust-fan housing. As an owner-builder in an owner-occupied home, you can pull the permit in your name, but you must hire licensed plumbers and electricians for the plumbing and electrical rough-ins; Farmington does not allow owner-builders to do licensed-trade work themselves. The permit fee is approximately $400–$550 (based on ~$15,000 project valuation). Plan-review takes 3–4 weeks because the reviewer will scrutinize the waterproofing-assembly detail (checking that your cement board and membrane meet ASTM D6135) and the exhaust-fan duct sizing (confirming that a 12-foot run with an 80-CFM fan requires a 5-inch or 6-inch duct; a standard 4-inch might be undersized). Inspections: rough plumbing (before waterproofing membrane is applied), rough electrical (for the fan circuit and any GFCI outlets), drywall/waterproofing (after membrane and before tile), and final (after tile and fan installation). Total timeline: 8–12 weeks from permit to final sign-off. If your duct run had been 30+ feet, you would also need to specify an in-line booster fan (adding $250–$400 to project cost) or upsize the duct, which the plan reviewer would flag.

Scenario C

Bathroom reconfiguration with wall removal, new double-vanity, relocated toilet and shower — older Farmington home, hired GC

You're gutting a 5x10-foot bathroom, removing a non-load-bearing wall between the bathroom and adjacent bedroom to create an open bathroom/dressing-room layout, installing a double vanity (side-by-side sinks) where only one existed, relocating the toilet to the opposite corner, converting a corner soaking tub to a large walk-in shower, and adding a new exhaust fan with ductwork. This is a major bathroom remodel and requires a Farmington permit. The removal of the wall (even if non-load-bearing) triggers framing review because Farmington's plan reviewer must verify that the wall is indeed non-load-bearing and that any affected utilities (plumbing vent stacks, electrical circuits) are properly rerouted. The relocated toilet drain-line must be sized per IRC P2706 and the trap arm cannot exceed 3 feet (unless you use a long-sweep fitting, which requires plan notation); a typical relocation to the opposite corner in a 5x10 bathroom means the trap arm will be 8–10 feet, requiring a different routing strategy (perhaps raising the toilet flange or using a wet-vent configuration) that the plan reviewer will scrutinize. The double-vanity requires two separate supply lines and two traps; confirm that your main water line and drain stack can support two fixtures (many older Farmington homes have undersized main drains, e.g., 2-inch instead of 3-inch, which may need upsizing). The shower conversion requires full waterproofing documentation per IRC R702.4.2. Electrical work includes: new circuits for the second vanity (if adding outlets/lights), new GFCI-protected circuit for the exhaust fan, and verification that existing circuits aren't overloaded. The permit fee is approximately $500–$800 (based on ~$20,000–$30,000 project valuation). Plan-review takes 4–6 weeks because the reviewer checks structural calculations (or confirms non-load-bearing status), plumbing routing (trap arms, vent stacks, slope), electrical load calculations, and seismic bracing (bathroom fixtures must be braced per Wasatch Fault overlay rules). Your GC must hire a structural engineer to certify the wall removal (cost $400–$800), which is deducted from the permit fee in some cases or billed separately. Inspections: framing (before drywall), rough plumbing, rough electrical, drywall/waterproofing, and final. Total timeline: 10–14 weeks from permit to final sign-off. This scenario illustrates why full bathroom remodels with layout changes take longer and cost more in permitting than simple fixture swaps — Farmington's plan-review team is careful about structural integrity and seismic resilience in older homes near the Wasatch Fault.

Permit required (wall removal + fixture relocation + waterproofing change) | Structural engineer certification required (~$400–$800) | Trap-arm routing complexity (8–10 ft reach to opposite corner) | Main drain may need upsizing (verify 3-inch minimum) | Seismic bracing required for toilet, sinks, and shower valve | New electrical circuits require GFCI/AFCI callouts | Permit fee $500–$800 | Licensed GC/plumber/electrician required | Total project $20,000–$35,000 | Timeline 10–14 weeks

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Waterproofing assembly requirements in Farmington bathrooms

Farmington Building Department enforces IRC R702.4.2 strictly, which requires any shower or tub enclosure to have a water-resistant or fully waterproof assembly. The code defines three approved methods: (1) cement board or glass-mat-faced gypsum board (per ASTM C1288 or C1629) with a liquid-applied water-resistant coating, (2) sheet membranes such as Kerdi, Nobleseal, or equivalent (per ASTM D6135), or (3) tile-board liner systems listed to ANSI A118.10. The key detail Farmington's plan reviewers examine is the specification of the membrane product and its installation. Many homeowners or contractors assume 'a waterproofing product' suffices; in reality, products vary widely. A cheap polyethylene or asphalt-based membrane does not meet ASTM D6135 and will be rejected. Farmington's reviewer will cross-check the product name against a list of approved membranes (typically Kerdi, Aqua-Lok, Schluter, Ditra, or equivalent) and will ask for technical data sheets or third-party test reports if unfamiliar with the product.

The waterproofing assembly must extend from the floor up to the shower head (minimum 6 feet above the pan per IRC R702.4.2.1) and behind and above the tub if the tub is being retained. The membrane must overlap all seams by at least 2 inches (depending on product) and must be sealed at all penetrations (drain, water-supply lines, exhaust-fan duct, etc.). If you're using cement board, the liquid-applied membrane must be compatible with cement board (some membrane products cure to a plastic sheet that doesn't bond well to cement board; Farmington will ask you to verify compatibility). If you're using a sheet membrane like Kerdi, the installer must seal seams and penetrations using Kerdi-Fix or approved sealant. The plan-review process will include a request for the waterproofing-assembly diagram (cross-section drawing) showing the substrate, membrane, tile adhesive, grout, and sealant layers. If this diagram is missing from your permit application, the application will be rejected as incomplete.

A unique consideration in Farmington's climate (zone 5B Wasatch, high-elevation, dry winters) is that inadequate ventilation can lead to moisture trapping in walls, which accelerates mold and wood decay in the high-humidity summer months (June–August). Farmington's plan reviewers often recommend (though do not yet require) that homeowners upgrade exhaust-fan CFM above the code minimum (80 CFM for a 5x8 bathroom) to 120–150 CFM to account for the home's overall humidity load. If your main water heater is in an adjacent space, additional ventilation helps prevent condensation buildup. The cost to upsize a fan is minimal ($50–$100 in equipment), but it's a detail that helps protect the waterproofing assembly and the overall structure.

Seismic bracing for bathroom fixtures in Farmington's Wasatch Fault zone

Farmington sits within the Wasatch Fault seismic zone (class D or higher per IBC Section 1613), which means any new plumbing or mechanical equipment in bathrooms must be braced or restrained against seismic movement. This requirement surprises many homeowners and contractors from outside Utah, but it's non-negotiable in Farmington's code. The city's plan-review checklist explicitly lists 'Seismic Restraints per IBC Section 1705.8' as a required callout on permits. For bathrooms, this typically means: (1) toilet flange bolts must be stainless steel (not zinc-plated) and torqued to 25–30 ft-lbs to resist uplift during earthquake shaking, (2) sink vanities (especially double vanities with heavy stone countertops) must be bolted to wall studs using L-brackets or similar hardware rated for lateral forces, (3) if a new water heater is installed in an adjacent space (e.g., in a closet or utility room accessed from the bathroom), it must be strapped with two metal bands rated for seismic restraint (minimum 1-inch bandwidth, rated for at least 100 lbs lateral force), and (4) any gas supply lines must be flexible and include a manual shut-off valve with a seismic shut-off device (if required by local gas utility). The cost to implement these measures is minimal ($50–$200 in hardware), but failure to show them on the permit drawings is a quick rejection.

Farmington's Building Department has received feedback from the Utah Geological Survey and the Wasatch Front Observatories regarding seismic resilience in residential bathrooms. Older Farmington homes (built before 2000) often lack proper fixture bracing, which was not code-required at the time. When homeowners remodel bathrooms in these older homes, Farmington takes the opportunity to upgrade seismic restraints as part of the permit process. This is a best-practice approach that has become standard in Farmington and other Wasatch Front communities. If your bathroom remodel involves moving a toilet or installing new plumbing fixtures, the plan reviewer will require seismic bracing callouts; there is no exemption for cosmetic-only work that moves plumbing.

A practical note: if your contractor or plumber is unfamiliar with seismic bracing requirements (e.g., if they're from California, Arizona, or the Midwest), educate them on Farmington's requirements before design. Some contractors assume seismic bracing is optional or a 'nice-to-have' in Utah; in fact, Farmington's inspectors will fail final inspection if seismic restraints are visible but not torqued correctly or if bolts are standard (non-stainless) hardware. The city's inspector will use a torque wrench to verify toilet-flange bolt torque during final inspection, so ensure your plumber knows the specification. Including this detail in your permit application upfront avoids last-minute surprises and potential failed inspections.

City of Farmington Building Department
Farmington City Hall, Farmington, UT (verify exact address and suite number with city)
Phone: (801) 451-3286 or Farmington City main line — confirm building permit line when calling | Farmington permit portal (limited online filing; in-person or certified mail submission recommended for full details)
Monday–Friday, 8:00 AM–5:00 PM (Mountain Time); closed municipal holidays

Common questions

Do I need a permit to replace my bathroom faucet or toilet in place in Farmington?

No, if the faucet or toilet is being replaced in the same location without moving the supply or drain lines, no permit is required. This is considered a maintenance or fixture-swap repair. However, if you're relocating the toilet to a new spot, replacing the vanity in a different location, or upgrading plumbing lines, a permit is triggered. To be safe, call Farmington Building Department at (801) 451-3286 and describe the exact work; if it's in-place, they'll confirm exemption verbally.

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

Plan review typically takes 2–5 weeks, depending on the complexity. A simple fixture relocation (toilet + vanity, no wall changes) may take 2–3 weeks. A full gut with waterproofing, wall removal, and seismic bracing callouts can take 4–6 weeks because the reviewer must scrutinize structural integrity, plumbing routing, electrical load, and seismic compliance. Resubmittals after rejection add 1–2 weeks per cycle.

What is the permit fee for a full bathroom remodel in Farmington, Utah?

Permit fees are based on the estimated cost of work (valuation). A typical full bathroom remodel in Farmington costs $12,000–$30,000 and generates a permit fee of $300–$800, usually calculated at 2.5–3% of valuation. A $15,000 remodel would be roughly $375–$450 in permit fees. Call Farmington Building Department with your project estimate and they will quote the exact fee before you apply.

Do I need a licensed contractor to do a bathroom remodel in Farmington, or can I do it myself as the owner?

Farmington allows owner-builders for owner-occupied homes, meaning you can pull the permit in your own name. However, licensed plumbers and electricians must perform plumbing and electrical work; you cannot hire an unlicensed worker or do these trades yourself. You can do cosmetic work (tile, painting, etc.) yourself. If you hire a licensed general contractor, the GC typically pulls the permit and is responsible for code compliance.

What happens if I do a bathroom remodel without a permit in Farmington?

If unpermitted bathroom work is discovered (via neighbor complaint, home inspection, or future resale), Farmington Building Department will issue a stop-work order and a fine of $500–$1,200. You'll be required to pull a retroactive permit at double the standard fee, pass all required inspections, and potentially pay for structural corrections if code violations are found. Additionally, Utah law requires disclosure of unpermitted work to future buyers, which can kill a sale or lower the sale price by $10,000–$30,000. Home insurance may also deny claims related to unpermitted work (e.g., water damage from failed waterproofing).

Do I need seismic bracing callouts on my bathroom-remodel permit in Farmington?

Yes, because Farmington is in the Wasatch Fault seismic zone, any bathroom remodel involving fixture relocation or new plumbing/mechanical equipment must include seismic-bracing callouts on the permit drawings. This means showing stainless-steel toilet-flange bolts, vanity L-brackets bolted to studs, and strapping for any water heaters or mechanical units. The cost is minimal ($50–$200 in hardware), but omitting these callouts is a quick permit rejection. Farmington's plan-review checklist explicitly lists this requirement.

Can I convert my bathtub to a shower in Farmington without a permit?

No, a tub-to-shower conversion requires a permit because the waterproofing assembly changes (IRC R702.4.2). A bathtub surround may only have tile over drywall; a shower requires a water-resistant or fully waterproof assembly (cement board + membrane, sheet membrane like Kerdi, or approved tile-board liner). Farmington's plan reviewer will check that your waterproofing product meets ASTM D6135 and that seams and penetrations are sealed correctly. Plan-review time is 3–4 weeks; permit fee is $300–$500.

What if my bathroom-remodel permit application is rejected by Farmington Building Department?

Rejections in Farmington are typically due to missing or incomplete drawings (e.g., no waterproofing-assembly diagram, no electrical plan, no seismic bracing callouts) or code violations (e.g., trap arm exceeding 3 feet, exhaust-fan duct undersized, GFCI protection not shown). Farmington will issue a written request for clarification or resubmission. You have 60 days to resubmit corrected drawings; if you don't resubmit within that window, the application is closed and you must reapply (and re-pay the permit fee). Resubmittals typically take 2–3 weeks for re-review.

Do I need a plumbing or electrical inspection during my bathroom remodel in Farmington?

Yes, Farmington requires multiple inspections: rough plumbing (before waterproofing membrane), rough electrical (for new circuits and GFCI outlets), drywall/waterproofing (after membrane, before tile), and final (after tile and fan installation). You must call Farmington Building Department at least 24 hours before each inspection. If any inspection fails (e.g., incorrect GFCI wiring, improper waterproofing sealing), you must correct the deficiency and request re-inspection. Total inspection timeline is 4–8 weeks spread across the project.

What waterproofing products does Farmington approve for shower walls?

Farmington approves waterproofing products that meet ASTM D6135 or are listed to ANSI A118.10. Common approved products include Kerdi, Kerdi-Board, Schluter, Ditra, AquaLock, Hydroban (liquid), and Redgard (liquid). Cheap polyethylene or asphalt-based membranes do not meet code. When you apply for your permit, specify the exact product name, ASTM standard, and installation method on your drawings. If Farmington's plan reviewer is unfamiliar with your product choice, they will ask for technical data sheets or third-party test reports. To avoid delays, choose a well-known product like Kerdi or Redgard.

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 Farmington Building Department before starting your project.

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