Research by DoINeedAPermit Research Team · Updated May 2026
The Short Answer
Any bathroom remodel that relocates plumbing fixtures, adds new electrical circuits, installs new exhaust ventilation, or converts a tub-to-shower (or vice versa) requires a permit from the City of Romulus Building Department. Surface-only work — swapping vanities, faucets, or toilets in their existing locations — does not.
Romulus, unlike some adjacent communities that use county-administered permitting, requires all bathroom remodels involving structural, plumbing, or electrical changes to pull permits through the City Building Department. Romulus Building Department enforces the Michigan Building Code (currently the 2015 edition with state amendments), which means you follow state electrical code (NEC 2014) and plumbing code (IPC 2012) — but the city's own plan-review process and inspection scheduling can vary significantly from nearby Wayne County jurisdictions. A key Romulus-specific detail: the city maintains an online permit portal, but many bathroom remodels still route through in-person or phone submission during the initial intake, especially for residential interior work. Permitting timelines in Romulus typically run 2-4 weeks for plan review on a standard full bath, but fixture-relocation work that involves new drain runs often triggers a second-pass review if trap-arm lengths or drain routing don't immediately pass. Lead-paint rules apply: any pre-1978 home requires EPA-certified renovation notice and containment, which adds 10 days minimum to your project schedule. Owner-builders are permitted on owner-occupied homes, so you can pull the permit yourself and perform the work, but plumbing and electrical final inspections are non-negotiable.

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

Romulus bathroom remodel permits — the key details

The threshold for permitting in Romulus is straightforward but easy to misinterpret. Per Michigan Building Code (which Romulus adopts), any work that involves moving plumbing fixtures (toilet, sink, shower valve, drain), adding new electrical circuits (dedicated 20A for the exhaust fan or new outlets), installing new exhaust ventilation, or changing the tub-to-shower configuration requires a permit. What makes Romulus specific: the city's online portal (accessible via the City of Romulus website) lets you begin the application, but bathroom remodels often still require phone or in-person submission of construction documents — the portal is not a fully automated intake for plumbing/electrical bundles. The City Building Department's standard practice is to reject incomplete submissions immediately and request re-submission with a detailed floor plan showing fixture locations, drain routing, electrical layout, and ventilation termination. If you're doing a surface-swap (vanity, faucet, toilet, tiles) without moving anything, you do not need a permit. This matters because homeowners often assume a 'full bathroom remodel' always requires a permit; it only does if your scope moves something or adds new systems.

Plumbing code in Romulus is enforced per the IPC 2012 and Michigan amendments. The most common rejection point: drain trap-arm lengths. IRC P2706 limits the distance from a trap to a vent stack; for a typical bathroom, your toilet drain cannot run more than 6 feet horizontally from the vent, and your sink/tub drain cannot exceed 2.5 feet (without a secondary vent). In older Romulus homes, especially those with side-by-side bathrooms, relocating a toilet drain often hits this limit, triggering a requirement for a new vent line or a wet-vent configuration. Second common issue: waterproofing. If you're converting a tub to a shower (or installing a new shower), IRC R702.4.2 requires a continuous waterproofing membrane (cement board plus approved membrane, or a sheet-membrane system like Schluter or Wedi). Inspectors in Romulus require the waterproofing plan to be specified on the permit application and shown in photos during rough-in inspection; generic 'tile + thinset' does not pass. Third: drain sizing. A relocated drain must be sized per IPC tables; undersizing (e.g., trying to fit a shower/toilet combo onto a 1.5-inch line) is a frequent plan-review rejection. The city will ask you to either upsize the drain or relocate the fixtures to a line that already exists and is properly sized.

Electrical code in Romulus (NEC 2014, Michigan amendment) mandates GFCI protection for all bathroom outlets and AFCI protection for bedroom circuits in newer homes. If your bathroom remodel adds any new circuits or outlets, the plan must clearly label GFCI and AFCI locations; inspectors will fail a rough electrical inspection if these are missing. Exhaust ventilation (IRC M1505) requires a dedicated duct to the exterior (not into the attic or soffits), sized per bathroom square footage, with a damper to prevent backflow. Most homes use 4-inch duct; the run length matters — every 90-degree elbow or flexible duct section increases static resistance. Romulus inspectors will ask for the duct route and length on the electrical plan. If your remodel adds a new exhaust fan where none existed, this almost always requires pulling a dedicated circuit and can trigger a service-panel upgrade if your panel is at capacity. A 20A dedicated circuit for a bathroom exhaust fan and lights is standard; the plan must show this on the one-line diagram. Common electrical rejections in Romulus: missing GFCI circuit locations, exhaust duct termination not shown, or existing outlets not retrofitted with GFCI (if the plan calls for replacing outlets, GFCI must be added). Note that Michigan law treats AFCI and GFCI as non-negotiable; some older Romulus neighborhoods were wired in the 1970s-80s without these, and remodels will force the upgrade.

Fixture specifications and water pressure present a subtler but important angle in Romulus bathroom remodels. If you're relocating a shower valve to a new wall, the valve must be specified as pressure-balanced or thermostatic (IRC P2706 and plumbing code amendments). Many inspectors will request a product data sheet showing the valve's pressure-balance range; a standard single-handle valve without balancing will fail rough-in inspection in Romulus. Similarly, if you're adding a toilet in a new location (e.g., converting a powder room layout), the rough-in distance from the wall face to the center of the drain must be 12 inches (or 10 inches in some homes); deviation requires either custom rough-in work or relocation of the wall, a detail that often gets missed in initial design and triggers a second inspection cycle. Lead paint is a critical compliance factor in Romulus for any pre-1978 home: EPA Rule 40 CFR Part 745 applies, meaning you must provide lead-hazard notification (in writing, at least 10 days before work begins), and contractors working on surfaces must be EPA-certified. This doesn't require a separate permit, but it does impose a timeline delay and adds cost (certified contractor labor runs 10-20% higher). The city does not enforce lead rules directly, but if your home is financed or insured, the lender/insurer may require proof of compliance.

Inspection sequence in Romulus typically follows: permit issuance (1-2 business days after approval), rough plumbing (toilet rough-in, drain location, vent line), rough electrical (panel work, new circuits, outlet locations, exhaust fan, GFCI/AFCI labeling), framing/drywall (if walls are moved; often combined with rough electrical), and final (finished surfaces, fixture installations, exhaust duct termination with damper, plumbing final). For a full bathroom remodel with fixture relocation and new electrical, expect 4-5 inspections over 3-4 weeks. Romulus Building Department staffing is lean during peak season (April-October), so scheduling inspection appointments can take 5-7 business days. Some contractors book the next inspection immediately after the current one passes to avoid delays. Final inspection cannot be scheduled until all prior inspections pass, so delays early (e.g., failed rough plumbing due to trap-arm length) cascade into a 2-3 week project extension. Permit fees in Romulus are based on valuation; a $15,000 bathroom remodel typically triggers a $300–$500 permit fee (2-3% of valuation), plus separate electrical and plumbing fees if pulled as separate permits (some applicants file a single combined permit, others separate them; check with the city on current practice). The online portal and in-person visits are both available, but the city's preference during initial intake is increasingly online submission to reduce office crowding. Once submitted, expect a phone call within 1-2 business days if the submission is incomplete.

Three Romulus bathroom remodel (full) scenarios

Scenario A
Vanity, toilet, tile swap in place — Romulus home, no fixture moves, no electrical changes
You're replacing an existing vanity with a new 36-inch vanity (same footprint), swapping the toilet with an identical 12-inch rough-in model, and retiling the floor and shower surround. The existing exhaust fan and ductwork remain unchanged, and you're not adding any outlets or circuits. This is a surface-only remodel and does not require a permit in Romulus. You can order materials, hire a general contractor or tile specialist, and proceed without filing with the Building Department. However, two practical notes: first, if the home was built pre-1978, lead-paint rules still apply to any surface disruption (sanding, demolition), so the contractor should use EPA-certified practices or notify you of lead-hazard risks. Second, if the vanity replacement requires disconnecting/reconnecting the supply lines and p-trap, most Romulus contractors will do this themselves under the homeowner's direction, but some jurisdictions prefer a licensed plumber to sign off on the final connection — this is not a permit requirement but an insurance/liability matter between you and your contractor. Timeline: 1-2 weeks for materials and labor, no inspections, no permit fees. Cost estimate: vanity $300–$800, toilet $200–$400, tile labor $2,000–$4,000, total $2,500–$5,200 depending on tile choice and labor rates.
No permit required (surface swap only) | Lead-paint notification recommended for pre-1978 homes | No inspections | Licensed plumber optional but recommended for drain reconnection | Total project cost $2,500–$5,200 | $0 permit fee
Scenario B
Relocating toilet to opposite wall plus new exhaust fan duct — Romulus 1970s ranch
Your 1970s Romulus ranch has a half-bath off the kitchen, and you want to expand it into a full bath by moving the toilet to the opposite wall (to create space for a larger vanity and new shower base). This requires a new drain run because the existing toilet drain runs perpendicular to the new wall location; the trap-arm length from the new toilet location to the existing vent stack is approximately 8 feet (exceeding the 6-foot IRC P2706 limit). The city will require either a secondary vent line (wet-vent configuration) or a new vent stack. Additionally, you're installing a new exhaust fan with ductwork to the roof (the original half-bath had none). This triggers a permit because: (1) fixture relocation, (2) new drain run, (3) new electrical circuit for the exhaust fan and bathroom lighting, and (4) new plumbing vent. Plan-review focus: the city will scrutinize the drain-trap-arm length and require a detailed floor plan showing the new vent configuration. Expect a first rejection if the vent solution isn't clearly drawn; once approved, you'll pass rough plumbing only after the inspector verifies the vent stack location and drain slope (per IPC, drains must slope 1/4 inch per foot minimum). Rough electrical inspection covers the exhaust fan circuit (20A, dedicated), GFCI outlets, and the circuit's connection to the main panel. If your panel is at 80% capacity, the electrician may need to upgrade the main service (an additional $1,500–$2,500), triggering a separate utility notification with the city and a service-upgrade inspection. Final inspection verifies the vent duct termination at the roof (with damper, sloped slightly downward to prevent backflow), the exhaust fan mounting, and fixture installations. Lead paint applies (pre-1978), requiring EPA notification 10 days prior. Timeline: 4-6 weeks (2 weeks plan review, 1-2 weeks construction, 2-3 inspections spaced 5-7 days apart). Permit fees: approximately $400–$600 (3% of estimated $15,000–$20,000 valuation), plus potential electrical service-upgrade fee ($200–$400) if the panel requires upgrading.
Permit required (fixture relocation + new vent + new electrical circuit) | Trap-arm length exceeds 6 feet — secondary vent or new vent stack required | Frost depth 42 inches — main vent stack must extend below grade per Michigan amendments | Lead-paint EPA notification (10 days minimum before work) | Electrical service-panel upgrade possible ($1,500–$2,500 if at capacity) | Permit fee $400–$600 | Timeline 4-6 weeks | 4-5 inspections
Scenario C
Full gut renovation: tub-to-shower conversion, new walls, relocated vanity, new electrical panel upgrade — Romulus home
You're completely renovating a master bathroom in a 1990s Romulus colonial: removing the soaking tub and replacing it with a large walk-in shower (new drain run, new waterproofing assembly), moving the vanity 3 feet to the left, removing a half-wall to create an open layout, installing recessed lighting and heated-floor radiant panels, adding a new 30A circuit for the radiant system, and upgrading the main electrical panel from 100A to 200A. This is a full-scope renovation requiring a structural permit, a plumbing permit, and an electrical permit — most Romulus contractors file these as a single combined permit application. The city's review process will include: (1) structural engineer review of the wall removal (load-bearing vs. non-load-bearing; if load-bearing, a beam design is required), (2) plumbing plan review for the tub-to-shower conversion (waterproofing membrane specification, drain sizing, new vent if needed), and (3) electrical plan review for the service upgrade, new circuits, GFCI/AFCI locations, and recessed-light placement (IRC E3901 requires proper spacing from insulation in climate zone 5A/6A). Waterproofing is the most detailed plumbing focus: the city will require a specification (e.g., cement board + Redgard, or Wedi system, or Schluter) and will inspect the moisture barrier before drywall is installed. Radiant-floor electrical is a common stumbling block: the city will ask for a load calculation, circuit sizing (30A is typical for 150-200 sq ft of radiant), and GFCI/AFCI protection specifications. Michigan code requires AFCI protection on bedroom circuits (even if the bathroom is not the primary target, bedside radiant panels may fall under bedroom-circuit AFCI rules), so clarification is often needed. Service-panel upgrade adds a utility notification step: Romulus will coordinate with the local utility (DTE Energy or Consumers Energy depending on the area) to schedule an inspection of the new meter/panel before power is restored. Lead-paint notification is required for pre-1978 homes (this is a 1990s home, so lead doesn't apply). Timeline: 6-10 weeks (2-3 weeks plan review for the structural component, 2-3 weeks for electrical and plumbing sub-reviews, 4-5 weeks construction, 4-6 inspections spaced weekly). Permit fees: approximately $800–$1,200 (3% of $25,000–$40,000 valuation), plus electrical service-upgrade utility fee (typically $500–$800 through the utility). Many homeowners underestimate the plan-review timeline for structural wall removals; if the bearing calculation is incomplete, expect a second-pass review adding 1-2 weeks.
Permit required (structural, plumbing, electrical combined) | Tub-to-shower waterproofing assembly must be specified (cement board + membrane, Wedi, or Schluter) | Structural engineer review required for wall removal | Service-panel upgrade from 100A to 200A triggers utility coordination | Radiant-floor electrical circuit sizing and AFCI protection must be documented | Frost depth 42 inches affects exterior vent termination | Permit fee $800–$1,200 + utility service fee $500–$800 | Timeline 6-10 weeks | 4-6 inspections

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Plumbing code specifics in Romulus: drain sizing, trap arms, and vents

Romulus enforces the IPC 2012 with Michigan amendments, and the most frequent rejection point in bathroom remodels is incorrect drain sizing or trap-arm length. IRC P2706 limits the distance from a trap (e.g., a toilet's p-trap) to the nearest vent stack to 6 feet for a toilet and 2.5 feet for a lavatory or shower. In many older Romulus homes (particularly 1960s-1980s ranch and colonial layouts), the main vent stack is centrally located, and when you try to relocate a toilet to a wall farther from that stack, you exceed the limit. The code allows a secondary vent (a wet-vent configuration, where the toilet drain ties into a common vent with another fixture, such as a sink drain), but wet-venting must be drawn and approved on the plumbing plan before rough-in inspection. If the plan doesn't show the wet-vent configuration clearly, the inspector will flag it as non-compliant, and you'll be forced to either install a new vent stack (adding $1,500–$3,000 and often requiring roof penetration) or relocate the toilet to a closer wall. Drain sizing is equally critical: a toilet requires a 3-inch line; a sink is typically 1.5 inches; a shower is 2 inches. If you're combining a relocated toilet with a new shower on the same drain line (a common mistake), you must upsize that drain to 4 inches to accommodate the combined flow. The Romulus Building Department provides no variance for undersized drains; the code is enforced strictly.

GFCI and AFCI in Romulus bathrooms: electrical code requirements and common confusion

Romulus adopts NEC 2014 with Michigan amendments, and bathroom electrical is non-negotiable. Every outlet in a bathroom must be protected by GFCI (ground-fault circuit interrupter); this includes outlets within 6 feet of a sink, bathtub, or shower. A single GFCI outlet can protect all downstream outlets on that circuit, or individual outlets can be GFCI-protected. The plan submitted with your permit must clearly mark which outlets are GFCI-protected and which circuit provides that protection. If you're adding new outlets, they must all be GFCI-protected from day one. Many Romulus homeowners don't realize that a GFCI outlet in a bathroom doesn't protect the exhaust fan or light fixture (those are typically on a separate lighting circuit); the inspector will verify that bathroom lighting and exhaust are on their own dedicated circuit, separate from outlet circuits. AFCI (arc-fault circuit interrupter) is a secondary requirement that applies to bedroom circuits in homes built after 2008 (Michigan adopted AFCI requirements in 2011). If your bathroom is adjacent to a bedroom and the bathroom circuit shares a breaker with the bedroom, AFCI may be required; this is a nuance that varies home-to-home, so the city's plan reviewer may call you to clarify the circuit topology. A common rejection: submitting an electrical plan that shows a standard 20A breaker protecting all bathroom outlets without labeling GFCI protection. Romulus inspectors require explicit labeling; they will not infer that GFCI is present just because the circuit is in a bathroom.

City of Romulus Building Department
251 S. Huron Street, Romulus, MI 48174
Phone: (734) 941-6300 | https://www.ci.romulus.mi.us/ (search 'permits' or 'building department' for current online submission portal)
Monday-Friday, 8:00 AM - 5:00 PM

Common questions

Do I need a permit to replace a faucet or toilet in the same location in Romulus?

No. Replacing a faucet, toilet, or vanity in its existing location is considered maintenance and does not require a permit. You only need a permit if you relocate the fixture to a different wall or location. If you're unsure whether your project moves a fixture or just swaps it in place, contact the Romulus Building Department; they can clarify in 1-2 business days.

What is the frost depth in Romulus, and does it affect bathroom remodels?

Romulus is in climate zone 5A-6A with a frost depth of 42 inches. This primarily affects external plumbing vents: if your remodel requires a new vent stack that penetrates the roof, the vent line below grade must extend below the 42-inch frost line to prevent freezing and blockage. Most bathroom remodels don't involve below-grade vent work, but if you're relocating a main drain or adding a second-floor vent, the frost depth becomes relevant during plan review.

Can I pull a bathroom remodel permit myself as an owner-builder in Romulus?

Yes. Michigan allows owner-builders to pull permits on owner-occupied residential properties. You must live in the home and be the legal owner. However, you must still pass all inspections and comply with the Michigan Building Code. Licensed plumbers and electricians may still be required for their portions depending on the scope — check with the city on whether you can perform plumbing/electrical work yourself or if you need licensed contractors.

What is the typical timeline from permit approval to final inspection in Romulus?

For a simple fixture-swap with no permit required, timeline is 0 days. For a full bathroom remodel with fixture relocation and electrical work, expect 4-6 weeks total: 2 weeks for plan review, 2-3 weeks for construction, and 4-5 inspections spaced 5-7 business days apart. Delays occur if an inspection fails (e.g., trap-arm length rejection) and the work must be redone. Scheduling inspection appointments can take 5-7 business days, so booking early is key.

Do I need a permit to convert my bathtub to a walk-in shower in Romulus?

Yes. A tub-to-shower conversion changes the waterproofing assembly and drain configuration, both of which require a permit. Per IRC R702.4.2, the new shower must have a continuous waterproofing membrane (cement board plus approved membrane, or a sheet-membrane system). The city will require a detailed specification of the waterproofing system on the permit application and an inspection during rough-in before drywall is installed.

What happens if the trap arm on my relocated toilet drain exceeds 6 feet in Romulus?

The city will reject the plumbing plan during review. You'll be required to install a secondary vent (wet-vent configuration) or a new vent stack. A wet-vent allows two fixtures to share a common vent but requires careful design and must be shown on the plan before rough-in inspection. A new vent stack typically costs $1,500–$3,000 and requires roof penetration. Plan your toilet relocation carefully to stay within the 6-foot limit or budget for a secondary vent.

Is lead-paint compliance required for my bathroom remodel in Romulus?

Yes, if your home was built before 1978. EPA Rule 40 CFR Part 745 requires you to provide written lead-hazard notification to contractors and occupants at least 10 days before work begins. Contractors performing renovation work must be EPA-certified. This does not require a separate permit from Romulus, but it adds a 10-day timeline delay and is a legal requirement. Lenders and insurers often verify compliance.

Can I add a heated-floor radiant system in my Romulus bathroom remodel without a permit?

No. Radiant-floor electrical systems require a dedicated circuit and load calculation, both of which must be shown on an electrical plan submitted with a permit. The city will require verification that the circuit is properly sized (typically 20A-30A depending on coverage area) and that GFCI/AFCI protection is specified. A separate electrical permit may be required depending on the city's filing procedures.

What does the Romulus Building Department require on a plumbing/electrical plan for a bathroom remodel permit?

At minimum: a floor plan showing existing and new fixture locations, drain routing with slope direction (1/4 inch per foot), vent-stack locations, supply-line routing, electrical outlet and switch locations with GFCI/AFCI labeling, exhaust fan location and duct route to exterior, and any waterproofing assembly details (if a shower is new or relocated). Incomplete submissions are rejected immediately; expect the city to call or email within 1-2 business days requesting clarification or additional drawings.

Does Romulus have an online permit portal, and can I submit a bathroom remodel permit application there?

Romulus has an online portal accessible through the City of Romulus website. However, bathroom remodels with plumbing/electrical components often still require phone or in-person submission during initial intake to ensure completeness. The portal is best used for simple, single-scope projects. For a full bathroom remodel, contact the Building Department by phone at (734) 941-6300 to confirm whether you can submit online or should come in person with drawings.

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 Romulus Building Department before starting your project.