Do I need a permit for a full bathroom remodel in
West Chicago, Illinois?

West Chicago full bathroom remodels — the key details

The core rule is straightforward: any bathroom work that alters the location or function of a plumbing fixture, adds new electrical circuits, or changes the room's structure requires an Interior Alteration permit from the West Chicago Building Department. The most common trigger is relocating a toilet, sink, or tub—even a small shift (moving the toilet 2 feet to accommodate a corner vanity, for example) requires a permit because it triggers new drain-line routing, which must comply with IRC P2706 trap-arm length limits (the horizontal run from trap to vent stack cannot exceed 5 feet for a 1.5-inch toilet drain, measured horizontally—a 6-foot run is a code violation and will fail rough-plumbing inspection). Adding a new exhaust fan duct also requires a permit: the city enforces IRC M1505, which mandates that bathroom exhaust ducts terminate outside the building envelope (not into the attic or soffit) and the duct must be at least 2 inches in diameter for a standard bath, sloped toward the exterior termination point, and insulated in climate zones 4 and colder (West Chicago is 5A north of I-88 and 4A south, so nearly the entire city requires insulation). Any new electrical circuit serving the bathroom—a dedicated 20-amp circuit for the exhaust fan motor, a heated-floor circuit, or a separate vanity-lighting circuit—also triggers permit requirement because GFCI and AFCI protection rules (IRC E3902) must be shown on an electrical plan, reviewed by the department's electrical inspector.

Tub-to-shower conversions and shower-to-tub reversals are a common remodel scope that almost always require permits, because they involve a change to the waterproofing assembly per IRC R702.4.2. When you convert a tub alcove to a walk-in shower, the walls must be waterproofed with a continuous membrane system (cement board + waterproofing membrane, or modern alternatives like PVC-faced drywall with liquid membrane); the old tub alcove's setup (often just drywall + caulk) does not meet code for a shower environment. The city's plan-review department is strict about this: you must specify the exact product—for example, 'KERDI board with KERDI-FIX adhesive and KERDI waterproofing membrane' or 'DuRock cement board with RedGard liquid membrane'—not vague language like 'waterproof cement board.' A common rejection in West Chicago's permit office is a contractor submitting plans that say 'shower area will be waterproofed per code' without specifying materials; the reviewer will issue a Request for Information (RFI) asking for product specs, adding 1–2 weeks to the timeline. Additionally, if you're installing a new shower valve (mixing valve), it must be pressure-balanced or thermostatic per plumbing code—a standard two-handle valve is not compliant—and this must be shown on the plumbing plan. The valve specification delays plan review if omitted.

Moving walls or removing sections of wall in a bathroom requires a permit for structural and potentially mechanical reasons. A common example: removing a portion of the wall between a bathroom and an adjacent bedroom to create an open-vanity area. The removed wall section must be reviewed for whether it's bearing (supporting ceiling or roof load) or non-bearing; if it's bearing, you'll need a beam design or structural engineer's letter showing how the load is transferred. West Chicago enforces this requirement through its Interior Alteration review process, and the city will not issue a permit without structural documentation if the removed section could be load-bearing. Even a 3-foot section is flagged if it's not obviously non-load-bearing (e.g., stud wall between an interior bathroom and a closet). This can add 2–3 weeks and $500–$1,500 in structural engineering costs to your permit timeline.

Exemptions are narrow but critical to understand. Replacing an existing toilet, faucet, or vanity in the same location with the same type of fixture (toilet for toilet, pedestal sink for pedestal sink) requires no permit—you're just doing a fixture swap. Updating tile, paint, lighting fixtures (plug-in sconces, recessed lights in the existing soffit), or mirror does not require a permit. However, if you are relocating the vanity or sink to a new wall, or moving the toilet location by more than a couple of feet, you must pull a permit. The gray area: moving a vanity slightly (1–2 feet) along the same wall without changing the drain or supply routing is sometimes treated as exempt, but West Chicago's Building Department interprets this conservatively—if the rough-plumbing changes at all, a permit is needed. Call the city before assuming exemption on a minor relocate.

Practical next steps: obtain a permit application (available on the city's website or in person at West Chicago City Hall), complete the interior-alteration form, and prepare a plan set. For a full bath remodel with plumbing and electrical changes, the plan set should include a floor plan showing fixture locations, a plumbing schematic showing trap-arm routes and exhaust-duct termination, an electrical schematic showing GFCI/AFCI circuits and any new outlets, and a cross-section of any shower showing waterproofing assembly. If walls are being moved, include a simple framing diagram or structural engineer's letter. The city allows PDF submission via the online portal; submit and expect the first review in 10–15 days. Budget for 1–2 RFI cycles (each adding 5–7 days) if your contractor omits details. Permit fees are due at issuance (typically $250–$475 for a full bath remodel), and inspections are scheduled as: rough plumbing (after drain, vent, and supply lines are in place, before drywall), rough electrical (before drywall), drywall and waterproofing (after wallboard is up and waterproofing membrane is applied), and final (after all fixtures are installed and finishes are complete). Plan for 4–6 weeks total from permit issuance to final inspection.

Three West Chicago bathroom remodel (full) scenarios

Waterproofing assembly specifications — why West Chicago reviewers reject vague plans

Bathroom waterproofing is the single most common plan-review rejection in West Chicago's Building Department. IRC R702.4.2 requires that shower and tub surrounds be waterproofed to prevent water intrusion into framing, but the code does not specify a single product or method—cement board + membrane, PVC-faced drywall, acrylic shower pans, or other approved assemblies all meet code. The problem is that West Chicago's reviewers interpret 'waterproofing' as requiring explicit product naming and installation method. If your submitted plan says 'shower walls will be waterproofed with cement board and waterproofing membrane per code,' the reviewer will issue an RFI: 'Please specify cement board brand, membrane brand, and installation method (e.g., troweled, spray, sheet).' You must resubmit with 'HardieBacker 500 cement board (1/2 inch) with RedGard liquid waterproofing membrane applied per manufacturer instructions' or equivalent. This seems pedantic, but the reason is twofold: the city wants to avoid future mold claims (poorly installed generic 'waterproof membrane' is a leading source of mold litigation), and the inspector needs to verify the exact assembly during rough inspection.

The other common rejection: failing to show a waterproofing cross-section or detail drawing. For a walk-in shower, the city expects to see a vertical section drawing showing the base (tile setting bed, waterproofing membrane, sloped pan substrate, drainpipe), the walls (substrate, cement board, membrane, tile), and the transition to non-shower areas (where waterproofing stops). Without this detail, the reviewer cannot confirm that all four walls and the floor are protected; many contractors omit the detail, assuming 'it'll be done right on site,' but West Chicago requires the detail on the submitted plan. If you are converting a tub alcove to a shower, show the alcove's before-and-after cross-section with materials labeled.

A subtle but important detail: the city's rough-waterproofing inspection is mandatory before drywall closure if the bathroom includes new or relocated plumbing. The inspector will visit to confirm that the waterproofing membrane is installed on all exposed surfaces of the shower alcove (or tub surround) before drywall is taped, mudded, and painted. Many contractors assume this inspection is optional or 'covered in the final,' but West Chicago treats it as critical. If drywall is mudded over an improperly membraned shower wall, the inspector can issue a correction notice and require removal of drywall and reapplication of waterproofing—a $2,000–$5,000 rework. Schedule the rough-waterproofing inspection promptly after the membrane is applied.

GFCI and AFCI protection in West Chicago bathrooms — what the electrical plan must show

IRC E3902 and the 2021 Illinois Electrical Code require that all bathroom outlets and lighting circuits be GFCI-protected or AFCI-protected. This is a common electrical-plan rejection in West Chicago if not shown explicitly. For outlets, GFCI protection is mandatory on every outlet within 6 feet of a sink or tub (essentially all bathroom countertop and wall outlets). For lighting and fan circuits, AFCI (Arc-Fault Circuit Interrupter) protection is required. The difference: a GFCI (Ground Fault) protects against electrocution from water contact, while an AFCI protects against arc faults (electrical arcing that can start fires). A single GFCI outlet can protect downstream outlets on the same circuit if it's installed first in line, or you can use a GFCI breaker in the panel to protect the entire circuit. For AFCI, a breaker is often the clearest method, though AFCI outlets exist.

West Chicago's electrical reviewers require your plan to clearly label which outlets have GFCI and which circuits have AFCI protection. A common omission: contractors show a bathroom lighting circuit and exhaust-fan circuit on the electrical plan but do not label them as AFCI-protected. The reviewer issues an RFI asking, 'Confirm that the bathroom lighting and exhaust-fan circuits will be AFCI-protected per IRC E3902.' This is a 1–2 week delay. To avoid it, your electrical plan must state, for example, 'Lighting circuit on 15-amp AFCI breaker (Panel XYZ, position 3)' and 'Outlet circuit on 20-amp GFCI circuit or 20-amp GFCI breaker.' If you install a heated-floor mat circuit or add a new vanity-lighting circuit, label each as AFCI. The rough-electrical inspection will verify that the GFCI and AFCI breakers or outlets are installed as shown on the plan.

A secondary issue in West Chicago: bathroom exhaust-fan circuits often trip AFCI breakers unnecessarily because some exhaust motors (particularly older models or cheap models) have slight motor-arcing signatures that trigger AFCI nuisance trips. The city does not require you to solve this problem at the permit stage, but you should spec a modern, high-quality exhaust fan with low arcing (most modern fans are AFCI-compatible). If you install a cheapo fan and it nuisance-trips after final inspection, you'll be debugging it on your own dime. Budget for a name-brand fan like Panasonic WhisperCeiling, Broan AirTouch, or equivalent; these are AFCI-friendly and reduce callback calls.

Common questions