What Inspections a Bathroom Remodel Has to Pass in Baltimore County

A Baltimore County bathroom remodel passes through trade inspections, not a bathroom inspection. The plumbing and electrical permits each carry their own rough and final visits, scheduled by the licensed contractor who pulled them, and nothing may be covered until the rough passes. Remodel Now remodels bathrooms across Baltimore County.

Which inspections a Baltimore County bathroom actually has to pass

Baltimore County does not run a bathroom inspection. It runs trade inspections, and a bathroom remodel lives or dies on those.

The county's bathroom alteration permit page puts it in three sentences. An alteration permit is required for all commercial bathrooms. A permit is not required for residential bathrooms. Plumbing and electrical permits are always required, and the licensed plumber and electrician may apply for their respective permit before the work is initiated.

Read that again, because it sets your whole schedule. The building side of the Department of Permits, Approvals and Inspections usually has no file on a residential bath rebuilt inside its existing walls. The plumbing section and the electrical section always do. So the inspections your job has to pass are a plumbing rough, an electrical rough, a plumbing final and an electrical final. Four visits, two different inspectors, two different phone numbers, two separate permits.

A building permit enters the picture only when the scope grows past the room. The county's addition, alteration and structural modification page requires a permit for any addition, alteration or structural modification to an existing dwelling, and separately for structural work. Cut a joist for a new toilet drain, take out a wall to borrow closet space, dormer the roof over a second floor bath, and you have a building permit, which brings a framing inspection and a building final with it. If the walls come open to the exterior sheathing, the energy code comes along too.

Every system in a bathroom gets buried. The inspections are the only moment someone with no stake in the job looks at what is about to disappear.

Who calls the inspection, and the deadline that shapes your week

Homeowners usually assume they schedule inspections. They do not.

Baltimore County requires inspections for building, electrical and plumbing permits to be scheduled, rescheduled or cancelled through the online permit portal account, using the permit number. The account belongs to whoever pulled the permit. For your bathroom that is the plumbing contractor on the plumbing permit and the electrical contractor on the electrical permit, because the county's plumbing permit page allows only a Baltimore County licensed plumbing or gasfitting contractor to apply, and the electrical permit page allows only a Baltimore County registered or licensed electrical contractor.

The county's plumbing and gasfitting code, adopted by Council Bill 94-23, says the same thing from the other direction. Part 104.11.2 makes it the permittee's job to notify the department when the work is complete and tested and ready, to coordinate the scheduling, and to provide the access and the means of testing and operation.

Then the clock. A scheduling request has to be submitted by 2 p.m. the prior business day. A cancellation has to go in through the portal by 6 a.m., and after that it has to be a phone call: building inspections at 410-887-3953, electrical at 410-887-3960, plumbing at 410-887-3620. For an estimated time of arrival on the day itself, you call between 7:30 and 8 a.m.

That 2 p.m. cutoff is why a tile crew sometimes sits in a driveway. If the plumber finishes the rough at 4 p.m. on Tuesday, the earliest request lands for Thursday. Nothing gets covered in between.

The order the stages have to happen in

The sequence is not a preference. It is written into the codes the county enforces, and each stage gates the next.

Demolition first, down to framing wherever pipe or wire has to move. Then the trades rough in: drain and vent piping, supply lines, the tub or shower valve body, the branch circuit, the boxes, the fan housing and its duct. Everything open, everything reachable. Then the roughs get inspected. Only after they pass does insulation, backer board or drywall go anywhere near a stud bay.

The residential code the county adopted under Bill 49-24 states the ordering plainly. Section R109.1.2 requires the rough inspection of plumbing, mechanical, gas and electrical systems to be made prior to covering or concealment, before fixtures or appliances are set, and before the framing inspection. R109.1.4 puts the frame inspection after those rough inspections are approved. R109.4 adds the part people argue about: work shall not be done beyond the point indicated in each successive inspection, and a noncompliant portion shall not be covered or concealed until the building official authorizes it.

  • Rough plumbing. When it happens: After drain, vent, supply and valve piping is in and under test, before any board goes up. What the inspector is confirming: Pipe sizing, slope, venting, fittings, support, the valve, and a passing pressure test. What has to still be open: Every joint, every hanger, the full stud bay and any opened floor.
  • Rough electrical. When it happens: After cable is pulled, boxes and fan housing are mounted, before board. What the inspector is confirming: Circuit, conductor size, box fill, cable support and protection, grounding, device locations. What has to still be open: All cable runs, all box connections, nail plates at studs and plates.
  • Insulation and framing. When it happens: Only where a building permit is open and the walls were taken to the sheathing. What the inspector is confirming: Framing, firestopping and bracing, then insulation type, R-value, placement and air leakage control. What has to still be open: The full cavity, with insulation installed but nothing covering it.
  • Plumbing and electrical final. When it happens: After tile, fixtures, trim and devices are set and working. What the inspector is confirming: Fixtures connected and operating, clearances, temperature limit, GFCI protection, fan running. What has to still be open: Nothing, but access panels and the shutoffs have to be reachable.

Rough plumbing: the stage that gets tested, not just looked at

The plumbing rough is the one that surprises people, because the inspector does not only look. There is a pressure test running when the inspector arrives, and the permittee set it up.

The plumbing code Baltimore County enforces is the International Plumbing Code as adopted and amended by Bill 94-23, and the county's version is explicit that for detached one and two family dwellings and townhouses, the plumbing requirements of the International Residential Code do not apply. So the numbers in play come from the IPC. Section 312.1 makes the permit holder responsible for the applicable tests. The drainage and vent water test under 312.2 fills the system to the point of overflow, with no section tested at less than a 10 foot head of water, held not less than 15 minutes, tight at all points. The alternative is an air test at a uniform 5 psi for at least 15 minutes, and plastic piping may never be tested with air. That rules out the air test on most residential remodels, because the drain and vent you just installed is PVC.

While the water sits in the stack, the inspector is reading the layout. Baltimore County amended the venting rules, and the amendments are where out of town crews get caught. Under the county's Section 912.1, fixtures in one bathroom group, or in two adjacent bathroom groups on the same floor level, may be wet vented, and water closets may be vented by wet vent piping but may not be drained through it. Section 905.4.1 requires venting below a fixture trap to rise vertically with a wye fitting to at least 6 inches above the flood level rim of the fixture it serves before it ties into another vent.

Air admittance valves are a thinner reed here than the model code suggests. The county deleted IPC sections 918.2 through 918.8 outright and wrote its own 918.1. An AAV is allowed only if the department permits it, only on a lavatory, sink or standpipe, only where the fixture is an addition or modification to an existing system, and only where an existing condition genuinely prevents running proper vent piping. It has to sit at least 4 inches above the trap arm and stay accessible. A second floor bath vented entirely by valves under the vanities is not a Baltimore County bathroom.

Rough electrical: everything still has to be visible

The electrical rough is simpler in form and just as unforgiving about timing.

Baltimore County requires an electrical permit for all electrical work, including the extension of circuit wiring, and even for connecting replacement equipment to existing wiring. The only carve out is ordinary maintenance of existing systems, which covers swapping a light fixture or a switch. Permits must be obtained before any work starts, and the county states that working without one is a violation subject to a civil penalty. Electrical installations have to conform to the most recent published edition of the National Electrical Code, under Section 21-7-303 of the Baltimore County Code.

In a bathroom that means a short, familiar list. Receptacles need ground fault circuit interrupter protection. At least one has to land within 36 inches of the outside edge of each basin. The bathroom receptacles have to be served by at least one 20 ampere branch circuit. In a house built in the 1950s around Woodlawn or Lochearn, that last requirement is frequently the single biggest line item in the electrical scope, because the room is sharing a 15 amp circuit with the hall and the only way forward is a new home run from the panel.

What fails at this stage is rarely the design. It is cable stapled too far from a box, a missing nail plate where a run crosses a stud face, a box crowded past its fill, a bare ground not made up, or a fan housing hung with no duct attached yet. All of it is fixable in an afternoon and invisible once the board is up. Which is the entire reason the inspection comes first.

Insulation and framing, if the walls came all the way open

Most bathroom remodels never reach a framing inspection, because most of them never pull a building permit. When one does, the energy code arrives with it.

Baltimore County adopted the 2021 International Energy Conservation Code along with the building and residential codes under Bill 49-24, and the residential alteration checklist on the county's permit page asks for a 2021 IECC Residential Energy Efficiency Selection Form. The energy code's administrative section R105.1 requires work to remain visible and able to be accessed for inspection purposes until approved. R105.2.2 describes the framing and rough-in inspection, which happens before the application of interior finish and verifies insulation types, their corresponding R-values, their correct location and proper installation, along with the air leakage controls the code requires.

The alteration provisions matter more than the new construction tables here. Under R503.1.1, an existing wall, ceiling or floor cavity that gets exposed during construction does not have to meet the full new construction envelope requirements, provided the cavity is filled with insulation. That is a modest bar and an easy one to miss. A 1955 exterior wall opened behind a tub usually has nothing in it at all, or a flattened batt with the kraft facing stapled on the wrong side. Filling it is cheap while the wall is open and expensive forever after.

One warning about the order. The frame inspection comes after the trade roughs are approved, not alongside them. Insulation stuffed into a bay before the plumber's water test has been witnessed means pulling it back out.

Waterproofing a shower so it passes, and so it lasts

This is where the most money gets wasted quietly, and where the inspector's authority is broader than most homeowners expect.

Start with the assembly the code actually describes. Section 421.4.1 requires wall areas above built-in tubs with shower heads, and the walls of shower compartments, to be built of smooth, corrosion resistant and nonabsorbent waterproof materials extending not less than 6 feet above the room floor and not less than 70 inches above the drain, forming a watertight joint with each other and with the tub or shower floor. Section 421.5 requires the floor surface itself to be impervious, noncorrosive, nonabsorbent and waterproof, and 421.5.1 requires it to be laid on and supported by a smooth and structurally sound base. Section 421.4 sets the compartment at not less than 900 square inches of interior cross sectional area with a least dimension of 30 inches held up to 70 inches above the drain, with a 25 inch least dimension allowed only where the area reaches 1,300 square inches, and 421.4.2 requires an access opening of at least 22 inches clear.

Now the part the code does not say, and that gets built wrong every week. Cement board is not waterproofing. The residential code's backer board table in R702.4.2 lists what may back wall tile in tub and shower areas: glass mat gypsum backing panel to ASTM C1178, fiber reinforced gypsum panel to C1278, nonasbestos fiber cement backer board to C1288, and fiber mat reinforced cementitious backer units to C1325. Those are substrates. They tolerate water without stopping it. R702.3.7.1 separately bars water resistant gypsum backing board where there will be direct exposure to water, so greenboard in a shower is not a grey area.

A shower that stays dry needs a continuous waterproof plane, either a bonded sheet or liquid membrane over the board or a traditional sloped liner under a mortar bed, with the corners, the curb and the pan to wall transition detailed as part of that plane. The failure mode in Maryland's climate is almost never dramatic. Water moves through grout and through the board, finds the back of the stud bay, and sits. Four winters later somebody steps on a soft spot in the hall outside the bathroom door.

The flood test, and what the inspector asks when it is not a lined pan

If the shower floor is a traditional liner, the test is specific and the inspector will want to see it.

Section 312.9 of the plumbing code requires that where shower floors and receptors are made watertight by the materials in 421.5.2, the completed liner installation be tested: plug the drain, fill the floor to a depth of not less than 2 inches measured at the threshold, hold it not less than 15 minutes, and show no evidence of leakage. The liner rules that feed into that test are where most pans go wrong. The liner has to turn up on all sides not less than 2 inches above the finished threshold. It may not be nailed or perforated within 1 inch above the finished threshold. It has to be pitched at a 2 percent slope toward the drain and fastened to the waste outlet to make a watertight joint.

A fastener an inch and a half above the threshold is the classic. The pan holds water for the 15 minutes because the hole is above the standing water line, passes, and then wicks at that exact point for the next decade.

Most showers built today are not lined pans. They are bonded systems: a foam or preformed tray with a sheet membrane, or a liquid membrane rolled over backer board. Those are not the materials described in 421.5.2, so they come in through a different door. Parts 104.5.1 through 104.5.3 of Baltimore County's plumbing code let the department approve an alternative material or method of installation when it is at least the equivalent of what the code requires, and require sufficient evidence to substantiate the equivalency claim. In practice that evidence is the manufacturer's listing and installation instructions. Ask your contractor which system is going in by name, ask whether the department has been told, and ask to see the pan flood tested before anything is tiled, whatever the membrane is. A test is cheap before tile.

The final inspection

The finals are short, and almost nothing fails them, which is exactly why people get careless.

On the plumbing side, Part 104.12.1 of the county code bars connecting any plumbing piping to a fixture before the department's approval, so the fixtures get set and connected under an issued permit with an inspection still ahead of them. The final test under IPC 312.4 is visual, with a pressure equivalent to a 1 inch water column held for not less than 15 minutes. The inspector will run water, look for traps and clearances, and check that the tub or shower valve is the balanced pressure, thermostatic or combination type IPC Section 412.3 requires, field adjusted so delivered water cannot exceed 120 degrees. Clearances get a second look here too: under IPC 405.3.1 a water closet, lavatory or bidet may not sit closer than 15 inches from its centerline to any side wall, partition or vanity, adjacent fixtures need 30 inches center to center, and there must be at least 21 inches of clear space in front. The deep vanity that was fine on paper eats that 21 inches.

On the electrical side, the final confirms GFCI protection is working, devices are mounted and the exhaust fan actually runs. Confirm where that fan terminates while there is still a reason to care. The mechanical code the county adopted under Bill 49-24 states at Section 501.3 that air shall not be exhausted into an attic or a crawl space, and the local exhaust table at Section 403.3.2.3 sets a bathroom in a dwelling unit at 50 cfm intermittent or 20 cfm continuous. A fan ducted into the attic is both a code violation and a slow roof problem, and in a remodel it is a twenty minute fix while the ceiling is open.

Part 104.9.6 also requires one approved set of plans, where plans were required, to stay on the job site until final approval of the installed work.

What a failed inspection actually does to the job

The fee is the least of it.

Part 104.11.3 of the county's plumbing code says work that does not pass its initial inspection shall be corrected and reinspected. Part 104.11.4 lists the conditions that can draw a reinspection fee, and the list is instructive: failure to provide access at the scheduled date and time, failure to have approved plans on site, work not completed for the scheduled inspection, corrective work not completed for the reinspection as scheduled, corrected work that does not pass its reinspection, and work that deviates from the approved plans and requires resubmittal, approval and reinspection.

Only two of those six are about the quality of the plumbing. The rest are about access, paperwork and calling the inspection too early. That ratio holds up on real jobs. The most common failed bathroom inspection in Baltimore County is not a bad solder joint. It is an optimistic phone call on Thursday for a rough that will not be ready until Monday.

The real cost is the cascade. A failed rough stops everything behind it, and because the reschedule has to clear the 2 p.m. deadline, a single miss moves tile, which moves the vanity, which moves the glass, which was measured for a date that no longer exists. If the house has one bathroom, every one of those days is a day the family is showering somewhere else.

The expensive version is covering work before it passes. Part 104.11.2 is unambiguous: where work has been concealed prior to inspection, it shall be made accessible as required until the necessary inspections are complete. An inspector who arrives to find backer board and tile over an unseen rough can require it opened. Nobody wins that argument, and the tile does not come off in reusable pieces.

Work that never got a permit at all runs through Part 104.10.4. The department investigates the work and the investigation fee is paid before a permit may be issued. Investigating buried plumbing means exposing it, which on a finished bathroom means opening a wall tiled in a pattern that is no longer made.

What to settle before the first wall comes down

Five questions, asked before the contract is signed, separate the crews who have done this in Baltimore County from the ones who have not.

Ask who holds each permit and who will be calling the inspections. The answer should name the licensed plumbing contractor on the plumbing permit and the registered electrical contractor on the electrical permit, and it should acknowledge the 2 p.m. deadline as a scheduling constraint on the whole job rather than a detail.

Ask what in your scope reaches a building permit. Moving a toilet across a joist bay, opening a bearing wall, or changing the room's footprint is a different application and a different inspection path. The county also requires the contractor's Maryland Home Improvement Commission license number on residential alteration applications, and that number belongs on your contract where you can check it.

Ask how the shower will be waterproofed, by brand and system. Backer board and thinset is not an answer. Ask whether the pan will be flood tested before tile, and ask to be there.

Ask what happens if a rough fails. You want to hear that the trade that did the work comes back and that the reinspection is their problem.

Ask where the fan terminates and how the opened exterior wall will be insulated. Both are five minute conversations now and demolition later.

Remodel Now remodels bathrooms and replaces showers across Baltimore County, including shower replacement and full bathroom remodels in Woodlawn, Parkville, Owings Mills and Towson. To talk through what your scope will trigger at the permit counter, the number is (301) 798-4696.

A bathroom packs plumbing, wiring, structure, waterproofing and finish into roughly forty square feet, and then hides all of it behind tile. Inspections are the last moment anyone can see the parts you are going to be living on top of.

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Frequently Asked Questions

What inspections are required for a bathroom remodel in Baltimore County?

For a residential bathroom rebuilt inside its existing walls, the inspections are the trade inspections. Baltimore County's bathroom alteration permit page states that a permit is not required for residential bathrooms but that plumbing and electrical permits are always required, so the job carries a plumbing rough, an electrical rough, a plumbing final and an electrical final. A building permit, and with it a framing inspection and a building final, enters only when the scope becomes structural or changes the room's footprint. If a building permit is open and the walls were taken back to the sheathing, the energy code's framing and rough-in inspection applies to the insulation as well.

Who schedules the inspections, me or my contractor?

The permit holder. Baltimore County requires inspections to be scheduled, rescheduled or cancelled through the online permit portal account using the permit number, and that account belongs to whoever pulled the permit. Only a county licensed plumbing and gasfitting contractor may apply for the plumbing permit, and only a county registered or licensed electrical contractor may apply for the electrical permit, so those two trades hold the scheduling. The county's plumbing code reinforces it: Part 104.11.2 makes the permittee responsible for notifying the department, coordinating the inspection and providing access and the means of testing.

How do you waterproof a shower so it passes inspection in Baltimore County?

With a continuous waterproof plane, not with backer board alone. The plumbing code requires shower walls and the wall above a built-in tub with a shower head to be smooth, corrosion resistant and nonabsorbent waterproof material running at least 6 feet above the floor and at least 70 inches above the drain, with watertight joints to each other and to the tub or shower floor, and the floor itself must be impervious and waterproof on a smooth, structurally sound base. The residential code's backer board table lists glass mat gypsum, fiber reinforced gypsum, fiber cement board and fiber mat reinforced cementitious units as acceptable substrates, and separately bars water resistant gypsum board where there will be direct exposure to water. A substrate is not a membrane, so the waterproofing is either a bonded sheet or liquid membrane over the board or a traditional sloped liner under a mortar bed, detailed through the corners, the curb and the pan to wall transition.

Does the shower pan have to be flood tested?

Where the floor is made watertight with a traditional liner, yes. IPC Section 312.9 requires the completed liner installation to be tested by plugging the drain, filling the floor to a depth of not less than 2 inches measured at the threshold, holding it for not less than 15 minutes and showing no evidence of leakage. The liner rules behind that test are where pans usually fail: it has to turn up on all sides not less than 2 inches above the finished threshold, it may not be nailed or perforated within 1 inch above that threshold, and it has to be pitched at a 2 percent slope toward the drain and sealed watertight to the waste outlet. A fastener an inch and a half up passes the test and leaks for years afterward.

What if the shower is a bonded membrane system rather than a lined pan?

It comes in as an alternative material. Bonded sheet and liquid membrane systems are not the lining materials the plumbing code describes, so Parts 104.5.1 through 104.5.3 of Baltimore County's plumbing and gasfitting code govern them: the department may approve an alternative material or method of installation where it finds it to be at least the equivalent of what the code requires, and it may demand sufficient evidence to substantiate that claim. In practice the evidence is the manufacturer's listing and installation instructions. Ask which system is going in by name, ask whether the department has been told, and ask to see the pan flood tested before tile regardless of which membrane is used.

What happens if a rough inspection fails?

The work gets corrected and reinspected, and everything behind it stops. Part 104.11.4 of the county's plumbing code lists six conditions that can draw a reinspection fee, and only two of them concern the quality of the work. The others are failure to provide access at the scheduled date and time, failure to have approved plans on site, work not completed for the scheduled inspection, and work that deviates from the approved plans. Because a reschedule has to clear the 2 p.m. prior business day deadline, one miss moves tile, which moves the vanity, which moves the glass.

Can an inspector make me take finished tile off?

Yes. Part 104.11.2 of the Baltimore County plumbing and gasfitting code says that where work has been concealed prior to inspection, it shall be made accessible as required until the necessary inspections are complete. The residential code says the same thing from the building side, barring a noncompliant portion from being covered or concealed until the building official authorizes it. An inspector who arrives to find backer board and tile over an unseen rough can require it opened, and the tile will not come off in reusable pieces.

Does an insulated exterior wall behind the tub have to be inspected?

Only where a building permit is open, but the requirement itself is worth knowing. Baltimore County adopted the 2021 International Energy Conservation Code under Bill 49-24, and that code requires work to remain visible and accessible for inspection until approved, with a framing and rough-in inspection before interior finish that verifies insulation type, R-value, correct location, proper installation and air leakage controls. Its alteration provisions let an existing wall, ceiling or floor cavity exposed during construction skip the full new construction envelope requirements only where that cavity is filled with insulation. A 1955 exterior wall opened behind a tub often has nothing in it, and filling it is cheap while it is open.

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