Do I Need a Permit for a Bathroom Remodel?

Bathroom remodels range from new paint and a vanity to a full gut with a relocated toilet, a curbless shower, and heated floors. Whether you need a permit depends on what is behind the walls. Cosmetic finish work is usually exempt, while new or relocated plumbing, wiring, ventilation, and structural changes almost always require a permit.

The model International Residential Code (IRC) provides the baseline that most states and cities adopt, often with amendments. Some jurisdictions require a permit for any fixture replacement or any electrical work at all. Confirm with your local building department before demolition, because inspectors need to see plumbing and wiring before walls are closed.

When you usually need a permit

Expect a permit if your bathroom project includes:

• Moving a toilet, sink, tub, or shower to a new location, or adding a fixture such as a second sink or a bidet that needs a new drain or vent.
• Replacing drain, vent, or supply piping, including the shower drain and trap in a tub-to-shower conversion.
• Replacing a shower or tub valve inside the wall. Many jurisdictions treat valve replacement as permitted plumbing work.
• Building a new tiled shower, where many departments inspect the shower pan liner or waterproofing.
• New electrical circuits or receptacles, including heated floors, a new exhaust fan, lighting on new wiring, or a dedicated circuit for a jetted tub.
• Adding or relocating an exhaust fan and its duct to the outdoors.
• Removing or moving walls, enlarging the room, or changing a window.
• Adding a new bathroom anywhere in the house.

Work that is often exempt

The 2021 IRC exempts “painting, papering, tiling, carpeting, cabinets, counter tops and similar finish work” (R105.2, Building). Its plumbing exemptions are narrower: stopping leaks, clearing stoppages, and “the removal and reinstallation of water closets,” provided the repair does not “involve or require the replacement or rearrangement of valves, pipes or fixtures.” Many jurisdictions go further with local amendments. In many places this covers:

• Retiling floors and walls without altering plumbing or framing.
• Replacing a vanity, countertop, or medicine cabinet in the same location.
• Replacing a toilet, faucet, or sink on the existing supply and drain.
• Replacing a light fixture or exhaust fan with a similar unit on existing wiring and ductwork, where the jurisdiction treats it as minor repair.
• Painting and new trim or accessories.

Local rules are often stricter. Some cities require a plumbing permit to replace any fixture, and some count a water heater, a valve, or a fan swap as permitted work. Condo associations frequently require their own approval for anything involving plumbing because of the risk to units below.

Code requirements inspectors look for

Knowing these model code requirements before you design will save you from failed inspections. Your jurisdiction may have amended them.

Ventilation

The IRC requires bathrooms to have either a window with at least 3 square feet of glazing, half of it openable, or artificial light plus a local exhaust system that discharges directly to the outdoors (R303.3), not into an attic or wall cavity. The minimum exhaust rate for a bathroom is 50 cfm for an intermittent fan or 20 cfm for a continuously running one (Table M1505.4.4), and the fan’s listed rating must meet that at 0.25 inch of static pressure, so a long or kinked duct run can leave a fan short.

Fixture clearances and shower size

Under IRC R307.1 and P2705.1, a toilet, lavatory, or bidet must be at least 15 inches from its centerline to any side wall, partition, or vanity, at least 30 inches center-to-center from an adjacent fixture, and have at least 21 inches of clear space in front. Showers need at least 900 square inches of interior area with a minimum finished dimension of 30 inches, and hinged shower doors must open outward (P2708.1). These numbers constrain small bathroom layouts more than people expect.

Shower pans and tile backing

A site-built shower pan must be lined with an approved material such as PVC or CPE sheet, hot mopping, or a bonded waterproof membrane meeting ANSI A118.10, sloped to the drain (P2709.2, P2709.3). The completed liner is flood-tested: the drain is plugged, the pan is filled to at least 2 inches at the threshold, and it must hold for at least 15 minutes without leaking (P2503.6). Wall tile in tub and shower areas needs a listed backer such as cement board, fiber-cement, or glass-mat or fiber-reinforced gypsum panels (R702.4.2).

Valves, glass, and electrical

• Shower and tub-shower valves must be pressure-balancing, thermostatic, or a combination type, with a limit stop field-set so the water does not exceed 120 degrees Fahrenheit (P2708.4). Bathtub-only valves need a temperature-limiting device (P2713.3).
• Glass in walls or enclosures around tubs and showers is a hazardous location requiring safety glazing when its bottom edge is less than 60 inches above a standing or walking surface, unless it is more than 60 inches horizontally from the water’s edge (R308.4.5).
• At least one receptacle within 36 inches of the outside edge of each basin (E3901.6), GFCI protection for bathroom receptacles (E3902.1, NEC 210.8(A)(1)), and at least one 20-amp circuit for bathroom receptacles that serves no other outlets, except that a circuit serving a single bathroom may also feed other equipment in it (E3703.4, NEC 210.11(C)(3)).
• No hanging or cord-connected fixtures, pendants, or ceiling fans within 3 feet horizontally and 8 feet vertically of the tub rim or shower threshold. Fixtures inside that zone must be marked for damp locations, or wet locations where subject to spray (E4003.11).

Water efficiency

Many states set maximum flow rates for toilets, showerheads, and faucets that are lower than federal standards. EPA WaterSense labeled fixtures usually meet or beat these limits, but check your state’s requirements before buying.

What the inspection covers

A bathroom remodel with plumbing and electrical work commonly involves:

1. Rough plumbing inspection. With walls and floors open, the inspector checks drain slope, trap arms, venting, supply piping, and the valve. A water or air test of the drain and vent system is common.
2. Rough electrical inspection. Wiring, box fill, circuit sizing, and fan wiring are checked before cover.
3. Shower pan or waterproofing inspection, in many jurisdictions. A flood test of the pan liner is a common requirement before tile is set.
4. Insulation inspection, if exterior walls were opened.
5. Final inspection. The inspector confirms GFCI protection, fan operation and termination to the outdoors, fixture clearances, safety glazing, and that work matches the permit.

Under the 2021 IRC, alterations that require a permit trigger smoke and carbon monoxide alarms in the locations required for new homes (R314.2.2, R315.2.2). Plumbing-only work is exempt from both rules, so a fixture-for-fixture plumbing permit usually does not trigger them, but a remodel with building or electrical permits usually does. See building inspection stages for how scheduling works.

Lead paint in older homes

For homes built before 1978, the EPA’s Renovation, Repair and Painting rule requires contractors to be EPA-certified firms and use lead-safe practices. Only minor jobs disturbing 6 square feet or less of painted surface per room inside are excluded, and demolition of painted surfaces never counts as minor (40 CFR 745.83). Homeowners working on their own home are generally not covered unless they rent out part of it, but they face the same hazard.

How the rules differ by city

Who issues the permit, what is exempt, and how fees are counted all vary. Four examples, checked against official sources in October 2026:

• Austin. Austin’s local amendments exempt repairing or replacing fixtures, exposed traps, fixture supply valves, and faucets when no other trade or city department is involved, which is broader than the model code. But the city states that “a new installation or replacement of a shower, tub, or combination tub and shower is not exempt,” so a tub-to-shower conversion needs a permit even with no layout change. Drywall repair up to 96 square feet is exempt, but not in wet areas such as a shower or toilet surround.
• Denver. Denver requires a construction permit when a remodel changes the floor plan, affects load-bearing walls, adds or reroutes ductwork, or adds or relocates electrical or plumbing fixtures. Like-for-like replacement of cabinets, flooring, ventilation, and plumbing or electrical fixtures needs no permit, and neither does drywall work smaller than one 4-by-8-foot sheet. Trade permits for electrical, plumbing, and mechanical work are separate and in most cases issued online as quick permits. Some projects also need a sewer use and drainage permit.
• Seattle. Plumbing and gas piping permits in Seattle do not come from the city’s building department. Public Health - Seattle & King County issues them and inspects the work in Seattle, Clyde Hill, and unincorporated King County, and requires a permit “whenever you are going to install, relocate, or change a plumbing or gas piping system.” Homeowners can get a homeowner’s plumbing permit to do their own work under RCW 18.106.150. Other King County cities issue their own plumbing permits.
• Fairfax County, Virginia. Under the fee schedule effective July 1, 2026, residential alteration plumbing permits are priced by fixture count: 1 to 7 fixtures pay the $141.75 base fee, 8 to 12 pay $179.55, and 13 to 17 pay $236.25. Electrical and building permits are separate.

What to have ready when you apply

A bathroom permit application commonly asks for:

• A floor plan showing existing and new fixture locations with dimensions and clearances.
• Plumbing details, such as fixture count, pipe sizes, and the drain and vent layout for relocated fixtures.
• An electrical plan showing receptacles, lighting, the exhaust fan, and any heated floor circuit.
• Fan make, model, and cfm rating, and where the duct terminates outdoors.
• Window and glazing details if openings change.
• Contractor names and license numbers, or an owner-builder declaration.
• An estimated project valuation, since many jurisdictions calculate fees from it. Plumbing permits are often priced per fixture. The building permit cost guide explains the common methods.

Hiring a contractor vs doing it yourself

Many jurisdictions allow homeowners to pull plumbing and electrical permits for a home they live in. Others require a licensed plumber or electrician for that work regardless of who owns the house. Questions worth asking the building department:

• Can I pull my own plumbing and electrical permits, and is there a homeowner affidavit or test?
• Is a shower pan inspection required, and what test do you want to see?
• Does replacing a shower valve or toilet require a permit here?
• Which code editions are in effect, and are there local water efficiency rules?
• Will this project trigger smoke and carbon monoxide alarm upgrades?

If a contractor is running the job, they normally pull the permit. Make sure it is issued before demolition and that the final inspection is completed before you make the last payment. The owner-builder permits guide covers the responsibilities you take on when you pull the permit yourself.

Practical tips

• Keep wet fixtures where the drains already are if you want to limit cost and permit scope.
• Do not tile over an uninspected shower pan or close walls before the rough-in sign-off.
• Choose an exhaust fan with enough capacity for the room and a short, smooth duct run to the exterior. Longer duct runs reduce actual airflow.
• Save inspection records and photos of the open walls for future repairs and a future sale.