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Planning a Bathroom Remodel: The Order of Work, Decisions and Inspections

The order a bathroom remodel runs in, from scope and permit to final inspection, and the decisions that lock in before the walls close.

By Avery Lund, researcher and editor Updated November 6, 2026 1 min read Editorial Standards

Settle the layout and the fixture list before anything is torn out. Good bathroom remodel planning puts those choices first because the drain, the shower valve, the fan duct and the outlet boxes are all fixed at rough-in. After that the order of work is demolition, rough-in, inspection, close-up, waterproofing and flood test, tile, then fixtures and the final inspection. Each cover-up step waits for an approval or a cure time. Those waits set the schedule more than the work itself does.

Chart of a bathroom remodel's phases from plan and permit to finish, with decision points, inspections and the shower flood test.

The chart runs through nine phases, from plan and permit to finish. It shows when the plumbing, power, ventilation and wall work happen, which decisions lock in, and where the inspections and the shower flood test fall. The order is assembled from county inspection guides in Virginia and Maryland and North Carolina’s shower-liner rule. Local names and order vary.

Decide scope before you shop

A bathroom remodel has two kinds of decisions:

  • Ones that can change until the last day: paint colour, mirrors, towel bars and even the vanity top.
  • Ones buried in the wall within the first week or two: the toilet drain position, the shower valve, the fan and its duct run, and every outlet and switch box.

Planning is mostly the job of moving every second-group decision to the front.

Start by writing down the scope in one of three sizes. The size decides who is involved and whether a permit applies.

  • Finish refresh: paint, new tile over sound surfaces, a new mirror and lights on the existing boxes. Fixtures stay where they are.
  • Like-for-like replacement: a new toilet, faucet, vanity or tub in the same spot, with the shutoff valves and drains left where they are.
  • Layout change: anything that moves a drain, a supply line, a valve, a wall or a cable run, or adds a fixture.

Most of the decisions in this guide apply to the third size. If your plan is really a refresh, small bathroom upgrades without a remodel covers the lighter route.

How much clearance do bathroom fixtures need?

Draw the room to scale and place the fixtures against the minimum clearances. The figures differ by code:

  • Virginia county example: Prince William County’s bathroom handout shows a toilet centred 15 inches from a side wall with 21 inches clear in front, and 24 inches clear in front of a shower opening.
  • California: the plumbing code, as summarised by the City of Roseville, also asks for 15 inches to the side but 24 inches clear in front of the toilet. It wants a shower of at least 1,024 square inches that fits a 30-inch circle.

If your jurisdiction’s number is the larger one, a layout drawn to the smaller one fails inspection. Bathroom layout clearances and standard vanity height go into the details.

Choose the fixtures themselves before demolition, not after. The shower valve body, the tub’s drain position, a wall-hung toilet’s carrier and a vanity’s plumbing height each fix the rough-in dimensions. A fixture chosen later has to fit holes already in the wall.

What order does a bathroom remodel go in?

The sequence below follows the inspection order in two county guides, from St. Mary’s County, Maryland, and Prince William County, Virginia. The phase names are this guide’s. Your contractor or building department may group them differently.

  1. Plan and permit. Layout, fixture list and the permit application, if one is needed (see the next section).
  2. Demolition. The room is stripped to the studs and subfloor where the scope requires it. This is also when hidden problems show up: rotted subfloor, old leaks, undersized framing.
  3. Rough-in. The plumber sets drains, supply lines and the shower valve body. The electrician sets boxes and runs cable. The fan housing goes in and its duct is run to the outdoors.
  4. Rough-in inspection. The inspector sees the open walls before anything covers them.
  5. Close-up. Insulation where required, then backer board or drywall.
  6. Waterproofing. A membrane over the shower walls and floor, then a flood test of the shower floor.
  7. Tile. Setting, grouting and curing.
  8. Finish. Toilet, vanity, faucet and trim kit set; devices, lights and the fan grille installed; final inspection.

Nothing gets covered before it is inspected

Two rules from the inspection guides hold the order together. St. Mary’s County’s adopted code says the rough inspection of each building system “shall be made prior to covering or concealment, before fixtures or appliances are set or installed”. Work “shall remain accessible and exposed for inspection purposes until approved”.

Prince William County’s handout adds a detail that is easy to get wrong: “Do not install the insulation until after the 198 is approved or the inspector allows”, and “The switch or receptacle should not be installed for concealment inspection”. In that county, insulation waits for the inspector, not the other way around.

Backer board is not waterproofing

Waterproofing is the step people underestimate. Cement backer board is not a waterproof layer by itself. USG says its Durock cement board “is vapor permeable and does not deteriorate in the presence of water”. Where waterproof construction is specified, “a separate barrier must be applied over or behind” the board. Shower waterproofing membranes explained compares the liquid and sheet types.

Do you need a permit for a bathroom remodel?

It depends on the scope and on the place. Call or check the website of your own building department before you schedule demolition. The answer can differ between neighbouring towns.

  • Finish work is often exempt. Under the 2021 IRC as adopted in Connecticut, the City of Meriden lists “Painting, papering, tiling, carpeting, cabinets, countertops and similar finish work” among the jobs that need no permit, as long as the work involves no changes to the building’s frame. The same list exempts clearing stoppages and repairing leaks only where the repair does not “involve or require the replacement or rearrangement of valves, pipes or fixtures”.
  • Some counties exempt in-place swaps. Prince William County, Virginia, says that where “only fixtures such as a toilet or faucet are being replaced in their original positions or a new vanity cabinet is installed without relocating the shutoff valves, a permit is not required”. A new tub or shower basin needs a permit “only if the location of the fixture, piping, or valves changes”.
  • Some cities permit them anyway. The City of Sacramento takes the opposite approach for in-kind swaps. Replacing fixtures and finishes in kind still goes through a “Minor Bathroom Remodel Permit”, only without plans.

When do bathroom inspections happen?

When a permit applies, inspections usually fall at three points.

Rough-in, with the walls open. In Prince William County this is one combined visit covering the framing, the fireblocking and every trade’s rough work. Where a slab or floor has to be opened for new drains, that county inspects the groundwork first.

The shower liner test, where the shower floor is site-built. North Carolina’s code calls for water at least 2 inches deep at the threshold, held for at least 15 minutes with no leakage. The state lets a contractor request it as a separate inspection “when they are ready to install the shower”, before tile.

South Carolina’s version of the same rule tests “to the lesser of the depth of threshold or 2″” and says the test “shall be performed at the final plumbing inspection”. Ask your inspector which timing applies before the tile setter is booked.

Final, after all trades are done. St. Mary’s County’s code puts the final inspection “after the permitted work is complete and prior to occupancy”.

Membrane makers also recommend their own water test, separate from any code inspection. Schluter’s shower handbook says to “Wait 24 hours minimum after the membrane installation is complete” before water-testing KERDI. It also says to “Refer to local plumbing codes for any specific requirements in your area”.

How long do waterproofing and grout take to cure?

Log-scale chart of the waits that set a bathroom schedule, from a 15-minute liner test to a 7-day grout cure.

The chart plots each wait on a log scale of hours: the North Carolina shower liner test of 15 minutes, RedGard at 1 to 1.5 hours per coat, HYDRO BAN at 2 to 24 hours before a flood test, KERDI at 24 hours before a water test, a mortar bed at 72 hours before HYDRO BAN, and Fusion Pro grout at 24 hours to light traffic and 7 days before shower use. Each wait applies only to the named product at the temperature and humidity its data sheet states. Cooler or damper rooms take longer.

The waits come from the products’ own sheets:

  • RedGard: Custom Building Products says it typically dries in “1-1.5 hours for each coat”, and up to 12 hours in cold or humid conditions. The flood test comes after both coats are dry.
  • HYDRO BAN: LATICRETE’s data sheet gives 2 hours at 70°F or above and about 24 hours at 50–69°F before a flood test. It asks for fresh mortar beds to cure 72 hours first.
  • Fusion Pro grout: Custom’s sheet asks for 7 days at 70°F and 50 percent humidity “before intermittent water exposure (such as a shower enclosure)”.

Another grout will have its own figure; read the bag or the data sheet. For joint widths and grout types, see sanded vs unsanded grout.

Choices that are hard to change later

Shower valve type and position

The valve body is plumbed at rough-in, and its trim plate must cover the hole later. Codes require a pressure-balancing or thermostatic valve with a temperature limit. South Carolina’s amended code, for example, says shower valves “shall be equipped with a means to limit the maximum setting of the valve to 120°F (49°C)”. Prince William County lists a valve that is “not ASSE 1016 or 1070 compliant” among common inspection failures.

Pick the valve brand before rough-in, because valve bodies and trim kits are rarely interchangeable between makers. Anti-scald shower valves explained covers the two valve types.

Fan location and duct route

A bathroom without a qualifying window needs mechanical ventilation. Prince William County’s summary of the Virginia code says it must “exhaust directly to the exterior of the dwelling” at “a minimum capacity of 50 cfm intermittent or 20 cfm continuous”. The county lists “Bath exhaust fan is not vented to the outside” as a common failure.

California goes further. Roseville’s handout requires a fan in every bathroom with a tub or shower “regardless of whether or not an operable window is installed”. The U.S. Department of Energy’s Building America Solution Center, in a page updated 2022-12-04, gives the same 50 and 20 cfm figures. It says to vent “outdoors, not into an attic, crawlspace, or space between floors”.

The duct route has to be decided with the framing open. The bathroom fan CFM guide covers sizing.

Outlet positions and circuits

Bathroom receptacles need GFCI protection, and local handouts add placement rules:

  • GFCI: an IAEI training handout on the International Code Council’s site quotes the 2017 NEC rule that 125-volt, 15- and 20-ampere receptacles in bathrooms “shall have GFCI protection for personnel”.
  • Placement: Prince William County requires receptacles within 36 inches of each basin. It accepts three ways to feed a new one, including a dedicated 20-amp circuit.
  • Shared outlets: Roseville’s handout says the 20-amp bathroom receptacle circuit “shall have no other outlets”, apart from a single-bathroom exception.

Newer electrical code editions reworded these sections, so the current text where you live may differ. Electrical work is a job for a licensed electrician. Mark the outlet, switch and light positions on the drawing so they are agreed before the boxes go in.

Shower size and threshold

The shower’s floor area and its curb or threshold height are framed early. The code minimum differs by jurisdiction: California’s 1,024 square inches, against 900 square inches in Wisconsin’s state-written plumbing code. Confirm the figure locally before the pan or the base is ordered.

Paint in older homes

If the house was built before 1978, demolition can disturb lead-based paint. Anyone paid to do work that disturbs paint in pre-1978 housing “must be certified in lead-safe work practices”, EPA says. The rule in general “does not apply to homeowners doing RRP projects in their own pre-1978 homes”, with exceptions for rentals, home childcare and flipping. Ask any contractor you hire for their certification before the walls come down.

Federal rules treat some work as renovation rather than minor repair: interior work that disturbs more than 6 square feet of painted surface per room, any window replacement, or demolition of painted surfaces.

Walls in an occupied house carry live wiring and supply lines, and some carry load. Switch off the breaker for any circuit in a wall before opening it. Leave wiring changes to a licensed electrician; ESFI recommends a “qualified, licensed electrician” for any electrical work in the home. If removing or cutting a wall or joist is in the plan, a licensed contractor or engineer decides whether it is load-bearing first.

A bathroom remodel planning checklist

Before demolition:

  • Scope written down as refresh, like-for-like, or layout change.
  • Scaled drawing with your jurisdiction’s clearances, the shower size and the door swing.
  • Every fixture chosen, with its rough-in sheet: toilet, vanity and faucet, tub or shower base, shower valve and trim.
  • Fan model, location and the duct route to the outdoors agreed.
  • Outlet, switch and light positions marked on the drawing.
  • Permit question answered by the building department, and the permit issued if needed.
  • For a pre-1978 house, the lead-safe question settled: who is doing the work, and their certification if they are paid.

Before the walls close:

  • Rough-in inspection passed, or the inspector’s written go-ahead.
  • Valve depth checked against the trim kit’s range.
  • Blocking added for grab bars, a wall-hung vanity or a glass door.
  • Photos of every open wall, with a tape measure in frame, for later repairs.

Before tile:

  • Membrane installed to its maker’s instructions, with its wait before the water test observed.
  • Shower floor flood test passed, and the liner inspection done if your jurisdiction requires it at this stage.
  • Movement joints planned at corners and changes of plane, as the membrane and tile makers’ sheets specify.

Before calling for final:

  • Grout and caulk cured for the product’s stated time before the shower is used.
  • Fan, lights and GFCI receptacles working.
  • Final inspection booked once every trade is finished.

Caulk lines at the tub and the corners will need renewing over the years. How to re-caulk a bathtub and how to regrout shower tile cover that upkeep.

Sources

Avery Lund

Avery Lund researches and edits the guides on Flint Home Decor, working from manufacturer instructions, building codes and safety-agency guidance, with every figure sourced and dated. Avery is not a licensed contractor; for electrical, gas or structural work, hire one.

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