Do You Need a Permit to Remodel a Bathroom in Baltimore City?

Yes. Baltimore City has no residential bathroom exemption, so a permit is required once a remodel goes past tile, paint and cabinets. Plumbing and electrical permits go to city-licensed trades, filed through E-Permits at the Department of Housing and Community Development. Remodel Now remodels bathrooms throughout Baltimore City.

Baltimore City has no residential bathroom exemption

The thing that trips people up is the city line itself. Baltimore City and Baltimore County are separate jurisdictions with separate codes and separate permit offices, and they do not treat a bathroom alike. The county publishes a bathroom alteration permit page stating that an alteration permit is required for all commercial bathrooms and is not required for residential ones, while plumbing and electrical permits are always required there. The city publishes nothing like it, because no such building-permit carve-out exists in the city code.

Section 105 of the Building, Fire, and Related Codes of Baltimore City requires a permit from the Building Official before anyone constructs, alters, repairs, rehabilitates, demolishes or moves a structure, or installs or alters equipment regulated by the code. A bathroom is a small room packed with regulated equipment. Pull the tub, open the wall, move a drain, add a fan, and each of those lands inside that sentence.

So the plain answer for a city address is yes, with one narrow qualification. Finish work is exempt. Everything behind the finish surface is not, and the line between the two is sharper than most homeowners expect.

What Section 105 actually exempts, and why tile is the dividing line

The city keeps its exemption list in Section 105.2 and also publishes it as a handout, Work Exempt From Permit, sorted by trade. The handout opens by noting that alterations generally require a permit while ordinary repairs, which it describes as maintenance activities, generally do not. In the building list for one- and two-family dwellings, the bathroom-relevant entries are short: interior painting, papering, tiling, carpeting, cabinets, counter tops and similar interior finish work, plus minor repair or patching of drywall or plaster.

Read that literally, because the Building Official does. Setting new tile on a sound existing substrate is finish work. Taking the substrate off to see what is behind it is not. Hanging a new vanity in the footprint of the old one is finish work. Hanging it somewhere else, which means a new drain and new supply, is not.

The electrical list is tighter still. It exempts listed cord-and-plug connected temporary decorative lighting, the reinstallation of attachment plug receptacles but not the outlets they sit in, wiring operating at less than 25 volts and incapable of supplying more than 50 watts, and minor repair work such as replacing lamps. Changing a bulb is exempt. Adding the exhaust fan the house never had is not.

Now notice what is missing. The one- and two-family section of that handout covers building, electrical, gas and mechanical. There is no plumbing exemption list at all. Plumbing runs on its own code, Part VI of the city article, which adopts the 2021 International Plumbing Code with city amendments and leaves the permit sections as written. Those sections exempt stopping a leak, clearing a stoppage, repairing a leak in a pipe, valve or fixture, and removing and reinstalling a water closet, but only where the repair does not require replacing or rearranging valves, pipes or fixtures. The same passage adds that where a concealed trap, drain, water, soil, waste or vent pipe is defective and has to be replaced with new material, that counts as new work and a permit is required.

Almost nothing in a real remodel survives that filter. A new tub, a new shower pan, a vanity on a relocated drain, a toilet moved six inches to make the door swing work. All of it is new work.

City versus county, in one short comparison

The two jurisdictions diverge in ways that matter on the first phone call.

  • Permit office. Baltimore City: Housing and Community Development, 417 E. Fayette St.. Baltimore County: Permits, Approvals and Inspections, Towson.
  • Building permit for a residential bath. Baltimore City: Required once work goes beyond finish items. Baltimore County: Not required for a residential bath, though the plumbing and electrical permits still are.
  • Trade licensing. Baltimore City: Permits issue only to electricians and master plumbers licensed to do business in the city. Baltimore County: Trades licensed and registered with the county.
  • Model codes in force. Baltimore City: 2021 IBC, 2021 IRC, 2021 IPC, 2021 IMC, 2020 NEC. Baltimore County: County amendments, including Council Bill 94-23 for plumbing.
  • Permit clock. Baltimore City: Expires if work does not start within 180 days, or is abandoned 180 days. Baltimore County: Runs on the county's own schedule.
  • Work done without a permit. Baltimore City: Permit still required after the fact, plus fee and penalty surcharge. Baltimore County: County investigation and fee before a permit can issue.

The permit office is the split that bites first, and it is purely geographic. A house in Howard Park answers to Fayette Street. A house a short walk west, over the line in Woodlawn, answers to Towson.

Who is allowed to pull each permit

Section 105.1.3 lets the general permit be applied for by the owner or lessee of the structure, the owner's or lessee's agent, or a licensed engineer or architect employed on the work. Then it hands the trades off to their own chapters.

Plumbing is the strictest of the three. Section 2903 requires the permit application to name the licensed master plumber responsible for the work along with that plumber's address, and it allows a plumbing permit to issue only to a licensed master plumber, a licensed master gas fitter, or a licensed on-site utility contractor doing business in the city. The Building Official may not issue it without proof of the insurance state law requires. Your general contractor cannot file it. Neither can you.

Electrical works the same way. Section 2706 allows an electrical permit to issue only to a master electrician, master restricted electrician, restricted electrician or maintenance electrician licensed to do business in the city. A competent electrician who holds a state license but has never registered to do business in Baltimore City cannot pull your permit until that is sorted out. Contractors register their license inside E-Permits using an access code that city staff issue only to the license holder, which is worth asking about before anyone schedules demolition.

Above the trades sits the Maryland Home Improvement Commission. The city's own permits page states that one- and two-family construction requires an MHIC licensed contractor, and that electrical, mechanical, gas and plumbing work requires a licensed contractor. That MHIC number belongs on your written contract and can be checked with the commission before you sign anything.

Remodel Now remodels bathrooms in Baltimore City rowhouses, including basement baths and full bathroom remodels where the stack and the layout both move, and works throughout Baltimore and the surrounding counties. To talk through a specific scope, the number is (301) 798-4696.

Which code editions the city is actually on

This sounds like trivia until an inspector cites a number you have never heard. The current city edition is the Building, Fire, and Related Codes of Baltimore City 2024, effective for applications filed on or after May 22, 2024 under Ordinance 24-341. It carries the 2021 International Building Code, the 2021 International Residential Code for one- and two-family dwellings, the 2021 International Plumbing Code, the 2021 International Mechanical Code and the 2020 National Electrical Code, each with city amendments.

Note the electrical edition. The city sits on the 2020 NEC, not whatever edition is newest, and the Part III amendments do not touch the bathroom articles. An electrician quoting a later edition is quoting a code the city has not adopted.

One more piece of structure catches people out. Part X adopts the residential code, but its plumbing chapters are not adopted, because that subject matter falls outside the Maryland Building Performance Standards. Plumbing in a city rowhouse is governed by Part VI and by the state plumbing code under the Business and Occupations Article. So a screenshot of a residential-code plumbing chapter settles no argument about shower size here. Those numbers come from the plumbing code.

The residential code still governs the room itself. It requires a bathroom to have an aggregate glazing area of at least 3 square feet in windows with half of that openable, unless artificial light and a local exhaust system are provided instead. It also requires the walls above a tub with a shower head, and the walls of a shower compartment, to be finished with a nonabsorbent surface running to a height of not less than 6 feet above the floor.

What the plumbing inspector measures

These numbers decide whether a layout works, and in a rowhouse bath of forty square feet they decide a lot. All of them come from the plumbing code the city enforces.

A water closet, urinal, lavatory or bidet may not sit closer than 15 inches from its center to any side wall, partition, vanity or other obstruction. Adjacent fixtures without a partition between them need 30 inches center to center. There must be at least 21 inches of clearance in front. That last one quietly kills rowhouse layouts, because the room is often only five feet wide and a deeper vanity eats the clearance from the opposite wall without anyone touching the toilet.

A shower compartment needs at least 900 square inches of interior cross-sectional area and a least dimension of at least 30 inches, held to a height of not less than 70 inches above the shower drain outlet. There is one relief valve in the rule: a compartment may go down to 25 inches in least dimension if it provides at least 1,300 square inches of area. The access opening has to give a clear finished width of at least 22 inches, which is why a narrow glass panel squeezed into an alcove sometimes fails on paper before anyone orders it.

The valve is not a style choice. Individual shower and tub-shower valves must be balanced-pressure, thermostatic or a combination of the two, installed at the point of use, with a means of limiting the maximum setting to 120 degrees. In-line thermostatic valves do not satisfy that requirement on their own.

Then the tests, which is where sloppy work surfaces. A water test on drainage and vent piping uses a head of at least 10 feet, held for not less than 15 minutes, tight at all points. An air test runs to 5 psi and holds 15 minutes, and plastic piping is never tested with air. A traditional lined shower floor gets its own test: plug the drain, fill the receptor with at least 2 inches of water, hold it 15 minutes, show no leakage. The liner must turn up at least 2 inches above the finished threshold, may not be nailed or perforated anywhere less than an inch above it, and must be pitched a quarter inch per foot toward the drain. Skip any one of them and a pan can pass a glance on the day and still leak years later.

The electrical side of a house wired in 1925

Under the 2020 edition the city enforces, the national electrical code comes down to a short list in a bathroom, and it is the list that turns a cosmetic job into a wire pull.

Bathroom receptacles need ground fault circuit interrupter protection. At least one has to sit within 3 feet of the outside edge of each lavatory basin. Those receptacles must be served by at least one 20 ampere branch circuit, and that circuit may not feed anything outside the bathroom, with the familiar allowance that a circuit serving a single bathroom may supply other equipment inside that same bathroom.

In a rowhouse that clause is the whole story. The original bathroom was usually fed off a shared circuit with the hall light and a bedroom, through two-wire cable with no equipment ground. Meeting the requirement means a home run from the panel, and the panel is often the next conversation after that.

There is also a keep-out zone around the water. Receptacles may not be installed within a zone measured 3 feet horizontally and 8 feet vertically from the top of the bathtub rim or shower stall threshold, and that zone includes the space directly over the tub. Cord-connected luminaires, chain- or cable-suspended fixtures, lighting track, pendants and ceiling-suspended paddle fans are barred from the same zone. A luminaire that does sit inside it has to be marked suitable for damp locations, and suitable for wet locations where it will be subject to shower spray. Recessed cans over a shower are perfectly legal, and the wet-location marking is the part that gets missed.

Rowhouse realities: party walls, stacks and the back building

City housing stock changes the job in ways a detached house in the county does not. Start with the walls. A rowhouse sits between two masonry party walls, and in older stock the floor joists of both houses bear into the same wall. That makes any plan to steal a few inches from the house next door, or to carry a new drain through that wall, a structural question rather than a carpentry one.

The interior walls are usually plaster on wood lath, and the exterior and party walls are frequently plaster on furring strips nailed straight to brick. There is no stud bay behind that furring, so a drain or vent that needs depth has to find a chase, go into a closet, or get furred out into the room.

Then the stack. Most two- and three-story rowhouses drain through a single cast iron soil stack, commonly in a corner or a rear chase, with the second-floor bath directly over the kitchen. Opening that stack to add a fixture means cutting iron and transitioning with shielded couplings, and the work happens above a finished ceiling that is going to be opened. Whether the stack gets touched is the single biggest factor pushing a city bathroom toward the high end, followed by whether the floor comes up, whether supply piping gets replaced back toward the meter, and whether this is the only full bath in the house.

Many city baths live in the back building, the narrower rear wing added onto the main block. Those wings have their own roof, often a shallow foundation, and floor levels that do not match the main house.

Basements are a separate problem. Where fixtures sit on a floor whose finished elevation is below the manhole cover of the next upstream manhole in the public sewer, the plumbing code requires those fixtures to be protected by a backwater valve installed in the building drain or the horizontal branch serving them, with access provided to the working parts. Fixtures above that elevation may not discharge through the valve, though existing buildings get an exception. Add the ejector pit and vented sump that a below-grade toilet usually needs, and a basement half bath turns into a real plumbing project.

The inspection sequence, and what gets opened back up

Permits first, and the city permit has a clock on it. It expires if work does not begin on site within 180 days of issuance, or if the work is abandoned or suspended for 180 days or more. Extensions are available for justifiable cause, and an application for one is due within 90 days after expiration.

Applications and inspection requests both run through E-Permits, with a kiosk and the One Stop Shop at 417 E. Fayette Street. The permits line is 443-984-1809 and building inspections are reached at 410-396-3470. In-person permit and plans review help is not offered on Wednesdays, a detail that can add a week if nobody mentions it.

Then the sequence. Demolition, then rough plumbing and rough electrical with every pipe, box, wire and fan housing open to view, then the rough inspections, then close the walls. The code is blunt about the order. Work requiring a permit has to remain visible and accessible for inspection until it is approved. The permit holder notifies the Building Official when work is ready and provides access and the means to inspect it. Work may not proceed beyond the point indicated in each successive inspection without approval, and anything found non-compliant has to be corrected before it is covered. The framing inspection itself cannot be signed until the rough electrical, plumbing, heating wires, pipes and ducts are approved.

An inspector who arrives to find cement board and thinset over an uninspected rough has the authority to have it opened. That argument is unwinnable, and in a rowhouse it hurts, because the tile is often running up a wall shared with the neighbors. A failed inspection is frequently not a failure of workmanship at all. It is an inspection called optimistically on a Thursday for a rough that will not be ready until Monday.

Ventilation and waterproofing, where the long-term failures come from

The mechanical code the city enforces sets local exhaust in bathrooms and toilet rooms at 50 cfm intermittent or 20 cfm continuous. The rate is the easy part. The termination is where city houses get hurt.

Air removed by a mechanical exhaust system must be discharged outdoors at a point where it will not cause a public nuisance and where it cannot be readily drawn back into a ventilation system. The code states flatly that air shall not be exhausted into an attic or crawl space or directed onto walkways, and the city has declined to adopt one of the model code's exceptions to that rule. On a flat or low-slope rowhouse roof the right answer is usually a roof cap with a damper, or a wall cap through a parapet or rear wall, with insulated duct and as few bends as the run allows. A fan rated at 80 cfm pushing through a long flex duct with four elbows is not moving 80 cfm, and the moisture it fails to move condenses on cold sheathing.

Waterproofing is the other thing that gets quietly skipped. The residential code limits water-resistant gypsum backing board, which is to say greenboard, by stating it may not be used where there will be direct exposure to water or in areas subject to continuous high humidity. The acceptable backers for wall tile in tub and shower areas are a short list: glass mat gypsum backing panel, fiber-reinforced gypsum panel, nonasbestos fiber-cement backer board, and nonasbestos fiber mat-reinforced cementitious backer units.

Backer board is a substrate, not a waterproofing layer. It does not rot, which is a different property from stopping water. Vapor moves through it and condenses on whatever is behind, and in a rowhouse that is often furring strips against cold exterior brick. A bonded sheet or liquid-applied membrane over the board, with inside corners and the pan-to-wall transition detailed properly, is what keeps the assembly dry. Use one moisture control layer, not two with a gap between them.

Unpermitted work, resale, and the questions worth asking

Baltimore City keeps permit records searchable and publishes an existing permit search alongside the application portal, so a buyer's agent, a home inspector or an underwriter can see what has been permitted at an address in a couple of minutes. A bathroom that clearly was not in the original floor plan, with nothing on record, becomes a question that has to be answered during a contract.

The code also closes the back door. A person who performs work without a permit, beyond the scope of a permit, inconsistent with approved plans, or after a permit has been revoked must obtain a permit for that work even if it is already completed, and must pay the appropriate permit fee and a penalty surcharge. A surcharge can be contested through a request for reduction submitted to the Building Official at 417 E. Fayette Street. Permitting finished work still means letting an inspector see it, which means opening a tiled wall whose tile is no longer in production.

One hazard deserves naming on its own in a city this old. In any house built before 1978, anyone paid to disturb painted surfaces must be certified under the EPA's Renovation, Repair and Painting Rule and must use lead-safe work practices. Taking down painted plaster is exactly the activity that rule was written for, and it describes the first morning of most rowhouse bathroom demolitions. EPA administers the program directly in Maryland, and a firm's certification is checkable.

Four questions will tell you most of what you need to know before you sign.

Ask which permits this scope requires and who files each one. The answer should name the building permit, say which licensed master plumber and which city-licensed electrician are filing the trade permits, and be specific about what crosses from finish work into alteration. A contractor who says nobody permits bathrooms in the city has told you something useful.

Ask for the MHIC number and check it before signing, and ask whether the trades are licensed to do business in Baltimore City specifically.

Ask how the shower will be waterproofed, by name. Backer board and thinset is not an answer. Listen for a named membrane system and whether the pan is flood tested before any tile goes on.

Ask where the exhaust fan terminates. If the answer is the attic or the joist bay, you have learned enough.

Plumbing, wiring, structure and waterproofing stack into a rowhouse bathroom the size of a parking spot, and it all disappears the day the tile goes up. The permit is the one moment somebody who does not work for you looks at the parts you will never see again.

Sources

Frequently Asked Questions

Does a bathroom remodel need a permit in Baltimore City?

In almost every case, yes. Section 105 of the Building, Fire, and Related Codes of Baltimore City requires a permit before anyone alters, repairs or rehabilitates a structure or installs or alters regulated equipment, and the city has no residential bathroom exemption of the kind Baltimore County publishes. The exempt list for interior work covers finish items only: painting, papering, tiling, carpeting, cabinets, counter tops and similar finish work, plus minor repair or patching of drywall or plaster. Once a wall comes open or a fixture moves, the work is outside that list.

Can I replace just the vanity, toilet and tile without a permit?

Tile set on a sound existing substrate is finish work and is exempt. The plumbing is the problem. The plumbing code the city enforces exempts only stopping leaks, clearing stoppages, repairing leaks in pipes, valves or fixtures, and removing and reinstalling a water closet where the work does not require replacing or rearranging valves, pipes or fixtures. Setting a new toilet and a new vanity on new connections is replacement work, not repair, so it falls under the permit requirement.

Who is allowed to pull the plumbing and electrical permits?

Not you, and not your general contractor. A plumbing permit may issue only to a licensed master plumber, licensed master gas fitter or licensed on-site utility contractor doing business in Baltimore City, and the application has to name that master plumber and give their address. An electrical permit may issue only to a master, master restricted, restricted or maintenance electrician licensed to do business in the city. Holding a Maryland license is not the same as being registered to work in Baltimore City, so ask before scheduling.

Is Baltimore City really different from Baltimore County here?

Yes, and it is the most common mistake homeowners make. They are separate jurisdictions with separate permit offices and different adopted code amendments. Baltimore County's bathroom alteration permit page says an alteration permit is not required for residential bathrooms, while adding that plumbing and electrical permits are always required there. Baltimore City publishes no equivalent, so the general permit requirement in Section 105 applies. City permits go through the Department of Housing and Community Development at 417 E. Fayette Street; county permits go through Permits, Approvals and Inspections in Towson.

Which codes does Baltimore City actually enforce in a bathroom?

The current edition is the Building, Fire, and Related Codes of Baltimore City 2024, which took effect for applications filed on or after May 22, 2024 under Ordinance 24-341. It carries the 2021 International Building Code, the 2021 International Residential Code for one- and two-family dwellings, the 2021 International Plumbing Code, the 2021 International Mechanical Code and the 2020 National Electrical Code, each with city amendments. The residential code's plumbing chapters are not adopted, so fixture clearances and shower sizes come from the plumbing code in Part VI.

How long is a Baltimore City building permit good for?

It expires if work does not begin on site within 180 days of issuance, or if the work is abandoned or suspended for 180 days or more. The Building Official may grant extensions for justifiable cause, and an application for one is due within 90 days after expiration. An expired permit can be reinstated once for final inspection if the request comes within three years, all rough inspections passed and the work is complete. Expiration does not extend any deadline to comply with a violation notice.

What happens if my bathroom was already remodeled without a permit?

The city code requires a permit for that work even if it is already completed, plus the appropriate permit fee and a penalty surcharge. A surcharge can be contested with a request for reduction submitted to the Building Official at 417 E. Fayette Street. The fee is rarely the hard part. Work requiring a permit has to remain visible and accessible until it is approved, so permitting a finished bathroom generally means opening part of it back up for an inspector to see the rough plumbing and wiring.

Does a rowhouse bathroom involve anything a detached house does not?

Several things. Floor joists in older rowhouses often bear into the same masonry party wall shared with the neighbor, which turns a drain route or a wall move into a structural question. Exterior and party walls are frequently plaster on furring strips against brick, with no stud bay for a drain or vent. Most houses drain through a single cast iron soil stack serving both floors. And a basement bath below the elevation of the next upstream manhole cover in the public sewer has to be protected by a backwater valve, usually alongside an ejector pit.

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