Bathroom Remodel Permit in Westmont, IL (2026)

Research by DoINeedAPermit Research Team · Updated May 2026

The Short Answer

A full bathroom remodel requires a permit in Westmont if you're moving plumbing fixtures, adding electrical circuits, installing new exhaust ventilation, converting tub to shower, or moving walls. Surface-only work—tile, vanity swap, faucet replacement in place—is exempt.

Westmont Building Department enforces the 2021 Illinois Building Code (adoption as of 2024), which means full bathroom remodels that involve fixture relocation, electrical changes, or structural/mechanical alterations fall under the city's standard Interior Alteration permit pathway. Westmont's key distinction from neighboring suburbs is its online permit portal integration with the city's main case-management system—you can track plan review and inspection scheduling in real time, unlike some adjacent communities that still rely on phone-and-fax workflows. The city also enforces a strict 42-inch frost depth requirement for any below-slab plumbing runs (per IECC 2021 adoption), which occasionally creates surprises for homeowners adding new drain lines under existing slabs. Permit fees in Westmont run $250–$650 based on total project valuation (typically 1.5–2% for interior work), and the city's plan-review timeline averages 10–15 business days for bathroom permits—faster than the DuPage County average because Westmont's building staff pre-screens for the most common rejections (missing waterproofing details, GFCI/AFCI layout, exhaust termination specs). A final key detail: Westmont requires separate electrical permits for any new circuits, even if bundled with the plumbing permit, which adds one more inspection to the sequence but keeps costs transparent.

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

Westmont Building Department issues stop-work orders for unpermitted plumbing alterations at $500–$1,500 per violation, plus mandatory double permit fees once you reapply.
If an inspector discovers unpermitted bathroom work during a future home sale or refinance, your lender will require full remediation or escrow holdback of $5,000–$15,000 until the work passes inspection.
Homeowner's insurance may deny water-damage claims traced to unpermitted bathroom work (especially tub-to-shower conversions with improper waterproofing), costing $10,000–$50,000+ out of pocket.
DuPage County health department can impose fines of $250–$1,000 per day if unpermitted plumbing venting or drainage violates septic/municipal sewage connection rules (less common in Westmont proper, but possible in township fringe areas).

Westmont bathroom remodel permits—the key details

The core permit trigger in Westmont mirrors the Illinois Building Code: any modification to plumbing location, drainage routing, or vent-stack attachment requires a Plumbing Permit (filed with the Building Department). Similarly, adding new electrical circuits—whether for heated floors, a second exhaust fan, or upgraded lighting—requires a separate Electrical Permit and a rough-in inspection before drywall. The reason these are distinct is that Illinois law (via delegated DuPage County authority in Westmont's jurisdiction) separates building, plumbing, and electrical oversight to ensure each trade's code compliance is reviewed by a licensed plan examiner in that discipline. For a typical full bathroom remodel involving fixture relocation and new exhaust, you'll file one Interior Alteration/Remodel permit (plumbing scope) plus one Electrical permit, and coordinate inspections across both. Westmont's online portal (accessible via the city website) allows you to upload plan PDFs, track status, and schedule inspections without a phone call—a time-saver compared to suburbs like Clarendon Hills or Hinsdale, which require in-person submissions or phone scheduling.

Waterproofing is the single most common rejection point in Westmont bathroom permits, especially for tub-to-shower conversions. The Illinois Building Code (adopted 2021) requires IRC R702.4.2 compliance: a continuous, impermeable membrane (typically 6-mil polyethylene, chlorinated polyethylene, or PVC) extending 6 inches above the tub rim or highest spray point, installed over cement board or equivalent substrate. Many homeowners assume traditional tile with mortar is sufficient; it is not. Your plan submission MUST specify the waterproofing system by brand or type (e.g., 'Kerdi-Board with Kerdi membrane' or 'cement board + CPE sheet'). Inspectors will request photos or written manufacturer certification during rough framing and before tile work; failure to submit this detail delays permits by 5–10 days. If you're keeping an existing tub in place and only replacing trim, you may be exempt from this requirement—but Westmont's plan examiners will ask you to declare in writing that no new moisture barriers are being disturbed, which is why even 'simple' tub remodels sometimes require permits if you're gutting walls.

Electrical code compliance in bathrooms is non-negotiable in Westmont. Per NEC 2020 (Illinois adoption), every outlet within 6 feet of a sink or tub must be GFCI-protected—either via a GFCI receptacle or a GFCI circuit breaker. Any new circuit you add must also be on an AFCI (arc-fault circuit-interrupter) breaker. Your electrical plan must show the existing outlet layout, identify which outlets are GFCI-protected (and by which method), and label all new circuits with their amperage and breaker type. Westmont's electrical inspectors check this during the rough-electrical inspection (before drywall) and again at final. A common mistake: assuming a GFCI outlet 'upstream' protects all downstream outlets on the same circuit—true in some cases, but not if the outlet is outside the 6-foot zone. Exhaust fan circuits also require special attention: if you're installing a new bathroom exhaust fan (not just replacing an existing one), the circuit must support the motor's amperage, the ductwork must be 4-inch or 3-inch depending on fan CFM, and the duct must terminate to the exterior (not attic or crawlspace) per IRC M1505.2. Westmont inspectors will ask for the exhaust fan specification sheet and a duct-termination detail; skipping this detail will trigger a plan-review rejection.

Drain-line relocation is where Westmont's 42-inch frost depth and glacial-till soils create a hidden complexity. If your bathroom is on a slab and you're moving a toilet, sink, or shower drain to a new location more than a few feet away, the new drain run must be either (a) sloped at 1/4-inch-per-foot minimum and supported on stable soil or (b) enclosed in conduit if running above the slab. Westmont's Building Department occasionally requires a geotechnical confirmation or soil-bearing letter if the new drain line is over 20 feet long or crosses a clay lens; this adds $500–$1,500 to the project cost but is rare for in-home bathroom moves. More common: trap-arm length violations. The arm connecting the trap to the main vent cannot exceed 2.5 times the trap size (for a 1.5-inch P-trap, maximum arm is 3.75 inches) per IRC P2706.1. If your new drain routing would exceed this, you must add a secondary vent or re-route the line—your plumber and plan examiner will catch this during review, but it's a fix that can delay project start by 2–3 weeks.

Owner-builder permits are allowed in Westmont for owner-occupied homes, meaning you can pull the permit in your name if the property is your primary residence. However, you cannot perform electrical or plumbing work yourself—those trades require licensed contractors in Illinois. You can do demolition, framing, drywall, tile, and painting, but the licensed plumber and electrician must be named on their respective permits, pull the rough inspections, and sign off on the final. This hybrid approach is common in Westmont and can save money on general contractor overhead, but coordinate carefully: your plumber's insurance must cover the work, and Westmont will require proof of their license and liability coverage before scheduling inspections. Lead-paint disclosure also applies if your home was built before 1978; the Illinois Department of Public Health rules require you to notify workers and document your awareness of lead hazards, even in owner-builder projects. Finally, bathroom permits in Westmont typically include a final inspection (fixtures in place, GFCI outlets tested, exhaust fan vented and operational) plus optional drywall inspection if the scope includes wall removal. The full timeline from permit filing to final approval averages 4–6 weeks, including plan review, inspections, and any corrections.

Three Westmont bathroom remodel (full) scenarios

Scenario A

Full gut-and-remodel with fixture relocation, new exhaust, new electrical—suburban ranch bathroom

You own a 1970s ranch in central Westmont with a 5x9 bathroom. You're relocating the toilet from the north wall to the east wall (new drain line ~8 feet), adding a second exhaust fan over the tub (new circuit), upgrading to a dual-vanity with two sinks (relocating one sink ~6 feet), and converting a corner alcove tub to a walk-in shower with a tile shelf. This scope absolutely requires permits: plumbing (for the toilet relocation, sink relocation, and new drain routing), electrical (for the second exhaust circuit and GFCI/AFCI updates), and Interior Alteration (for the structural framing of the new shower alcove and wall removal). Your plumber will check the new toilet drain for trap-arm compliance (the 8-foot run to the existing main vent must stay under the 1.5-inch trap's 3.75-inch max arm length—likely requiring a secondary vent, adding cost). The new shower requires waterproofing certification: you'll need to specify cement board + 6-mil polyethylene membrane (or equivalent) and provide a manufacturer detail or photo before framing inspection. Your electrician will pull a separate permit for the new 20-amp circuit to the exhaust fans and will GFCI-protect both vanity outlets plus the light fixture above. Westmont's Building Department will plan-review these three permits in sequence (plumbing takes longest, 10–15 days; electrical 5–10 days). Inspections: rough plumbing, rough electrical, framing, drywall (if walls are moved), and final. Total timeline: 5–8 weeks from filing to sign-off. Permit costs: ~$400 (plumbing) + $150 (electrical) + ~$100 (interior alteration fee) = $650 total.

Scenario B

Tub-to-shower conversion in place, same location, new shower valve and waterproofing only—Westmont colonial

You have a 1990s colonial in Westmont with a standard alcove tub. You want to remove the tub, install a new base and walls to create a walk-in shower at the same location (no plumbing relocation), replace the old trim valve with a pressure-balanced shower valve (per IRC P2708 requirement), and install new waterproofing. This is a permit-required job because the waterproofing assembly is changing. Unlike Scenario A, there's NO plumbing relocation (the drain and supply lines stay in place), so plumbing plan review is minimal—just the new valve specification and the waterproofing detail. Your plumber may not even need to do rough-plumbing inspection if the new valve is installed 'in-line' with existing supply (though Westmont inspectors sometimes want to see pressure-balance certification). The critical requirement: IRC R702.4.2 waterproofing. You must specify the system (e.g., Schluter Kerdi-Board or DuRock + CPE membrane), and it must extend 6 inches above the showerhead or spray zone. The framing inspection will confirm the substrate; the final inspection will verify the waterproofing is sealed. Electrical: if you're adding a new light fixture or exhaust fan, separate permit required; if keeping existing light/exhaust, no electrical permit needed. Interior Alteration permit required (to cover the framing and waterproofing scope). No secondary vent needed (drain in same location). Permits: one plumbing (or bundle with Interior Alteration), one Interior Alteration. Plan review: 7–10 days. Inspections: rough framing, final (drywall inspection may be skipped if no structural changes). Timeline: 3–5 weeks. Costs: ~$300 (plumbing + interior alteration combined).

Scenario C

Vanity swap, faucet upgrade, tile refresh—no permit needed unless walls move

You own a Westmont townhouse and want to replace the vanity cabinet (same location), upgrade the faucet (same supply lines, no new shutoff valve), re-tile the walls around the existing tub (no waterproofing change, just cosmetic tile over existing substrate), and add recessed lighting (existing electrical circuit extended with surface conduit if needed). This scope is exempt from permitting—no plumbing relocation (faucet and supply stay in place), no new electrical circuit (recessed lights can tap existing circuit with in-wall wiring once you verify the circuit capacity with an electrician, but no permit required if the circuit is 15 or 20 amp and not overloaded). The vanity swap is a fixture replacement, not an alteration. The tile work is cosmetic resurfacing. However, if the vanity swap requires moving the sink drain more than a few inches OR if you're adding a second vanity where one didn't exist, permits ARE required. In Scenario C, assume one-for-one swap: no permits. Cost: $0 permit fees (but hire a licensed plumber to verify the faucet hookup is code-compliant, ~$200–$400 labor). Timeline: contractor-driven, not permit-driven (1–2 weeks). Westmont allows owner-builder DIY for tile and painting in this scope, but plumbing must be licensed.

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Westmont's waterproofing and shower-enclosure code: Why details matter

IRC R702.4.2 (adopted in Illinois 2021 code) requires a continuous, impermeable moisture barrier in all wet areas, especially showers and tub surrounds. Westmont plan examiners interpret this strictly because the city sits on glacial-till and clay soils with high groundwater in some zones (particularly near the Des Plaines River watershed areas of central Westmont); moisture intrusion into wall cavities can lead to mold, structural rot, and costly remediation. The code allows several waterproofing systems: liquid-applied membranes (Redgard, Hydroban); sheet membranes (6-mil polyethylene, CPE, PVC); or pre-fabricated panels (Schluter Kerdi-Board, Durock DensShield Tile Backer). Each system has specific installation requirements. For example, liquid membranes must cure fully (per manufacturer spec, typically 24–48 hours) before tile-setting; sheet membranes must overlap seams by at least 6 inches and be sealed with manufacturer-approved tape; panels must be seamed with matching joint tape and sealed primer.

When you submit a bathroom permit to Westmont, your plan or specification sheet must name the waterproofing system and reference the manufacturer's installation guide. Inspectors will request photos or a manufacturer cutsheet during rough framing (before drywall closure) to confirm the material is on-site and installed correctly. The moisture barrier must extend 6 inches above the highest spray point (showerhead or tub rim) and cover the entire floor, walls, and any recesses. A common rejection: homeowners or contractors assume traditional drywall + paint or tile + mortar is sufficient, especially in older homes. It is not. This detail alone adds 3–5 days to plan review if missing, because the examiner must issue a request for information (RFI) and wait for your response.

For tub-to-shower conversions in Westmont, the waterproofing change is what triggers the permit requirement, not the fixture swap itself. If you're converting a tub alcove to a shower at the same location, the wall substrate (formerly tile over drywall) must be replaced or sealed per R702.4.2. This typically means removing tile and old drywall, installing cement board or equivalent substrate, and then applying a waterproofing membrane before retiling. If you're keeping the old tub trim tile in place and only adding a showerhead over the existing tub, you might argue this is cosmetic—but Westmont's plan examiners will ask for written confirmation that the existing substrate remains undisturbed, which is why it's safest to pull a permit for any tub-to-shower work.

Electrical code in Westmont bathrooms: GFCI, AFCI, and the 6-foot rule

NEC Article 210.8 (adopted in Illinois 2020 code) requires ground-fault circuit interruption (GFCI) protection for all outlets within 6 feet of a sink, tub, or shower in residential bathrooms. This protection can be provided two ways: a GFCI-type receptacle (which has a test/reset button) or a GFCI circuit breaker in the panel. The 6-foot measurement is horizontal distance along the floor; a wall-mounted outlet 3 feet high and 4 feet away horizontally is within the protected zone. Many homeowners think installing one GFCI outlet protects all downstream outlets on the same circuit—true if the GFCI outlet is installed first and the others are wired to its 'load' terminals, but only if all those downstream outlets are also within the bathroom. If you have an outlet in the hallway on the same circuit, it does not get GFCI protection from a bathroom GFCI outlet.

Westmont electrical inspectors check GFCI layout during rough-in (before drywall) and test every outlet at final inspection using a GFCI test plug. If outlets are not protected or if the protection is wired incorrectly, the permit will not close until corrected. A related code: AFCI (arc-fault circuit-interrupter) protection is now required for all circuits in bathrooms (not just outlets near wet areas). This means if you add any new circuit to a bathroom—for exhaust fans, heated floors, or lighting—that circuit must have an AFCI breaker. Westmont's electrical permit will require a panel diagram showing which breaker protects which circuit, the amperage, and the trip type (GFCI, AFCI, or both—combination breakers exist). This detail is why electrical permits take 5–10 days for plan review: the examiner must verify your panel can accommodate new breakers, that the wire gauge is correct, and that the branch circuits don't overload the main service.

For full bathroom remodels in Westmont, coordinate with your electrician early. They'll need to know the final layout of fixtures (sink, toilet, shower, lights, exhaust fans) to plan outlet locations and circuit routing. Vanity lights above a sink must be on GFCI if within 6 feet. Exhaust fans can be on a dedicated circuit (usually 20 amp, 12-gauge wire) or shared with a light circuit if capacity allows. Heated floors (if you're adding them) must be on a dedicated 20-amp circuit. Your electrician will submit a plan showing the existing panel, the new circuits, and the outlet/fixture schedule; plan examiners will verify this matches the plumbing and framing plans before issuing a rough-electrical inspection approval. Missing AFCI or GFCI details are the #2 reason for electrical permit rejections in Westmont (after incomplete panel labeling).

City of Westmont Building Department
75 East Wisconsin Avenue, Westmont, IL 60559
Phone: (630) 981-7043 (verify via city website) | https://www.westmont.il.us (building permits section; online portal may be available via city website)
Monday–Friday, 8:00 AM–5:00 PM (verify before visiting)

Common questions

Do I need a permit just to replace a toilet or faucet in my Westmont bathroom?

No, replacing a toilet or faucet in the same location without moving supply or drain lines is exempt from permitting. However, if you're adding a new shutoff valve at a different location, adding a second vanity, or converting the toilet drain to a different vent stack, permits are required. For safety, have a licensed plumber verify the hookup meets code; this is a $100–$300 inspection call, not a permit.

What if I'm just replacing old tile with new tile—do I need a permit?

No, cosmetic tile replacement on existing substrate is exempt. However, if the substrate (drywall, cement board) is damaged or if you're changing the shower/tub configuration (e.g., tub to shower), you likely need a permit because the waterproofing assembly may need to be updated per IRC R702.4.2. When in doubt, call Westmont Building Department and describe the scope; they'll confirm exempt vs. permit-required in 5 minutes.

My bathroom was built in 1975. Are there lead-paint rules I need to follow in Westmont?

Yes. Illinois Department of Public Health rules (and federal EPA RRP Rule) require disclosure and containment for pre-1978 homes. Before work starts, all contractors and occupants must be notified of potential lead hazards. You must use contractors trained in lead-safe practices (OSHA or EPA certification). Westmont Building Department does not enforce lead rules directly, but lenders and home inspectors will ask for documentation. Estimated cost: $300–$800 for lead-safe containment and disclosure per project.

How much will Westmont permit fees cost for my full bathroom remodel?

Permit fees for full bathroom remodels in Westmont typically range $250–$650, calculated as 1.5–2% of the project valuation. A gut-and-remodel (plumbing + electrical + interior alteration) with fixture relocation and waterproofing changes averages $400–$650. A tub-to-shower conversion in place averages $250–$400. Fees are due at permit issuance; you'll pay them when you pick up or file electronically via the city portal.

Can I do the work myself, or must I hire a licensed contractor in Westmont?

You can perform demolition, framing, drywall, tile, and painting as an owner-builder in Westmont (for your primary residence). However, all plumbing and electrical work must be done by licensed contractors. Illinois law prohibits owner-builder plumbing and electrical; the licensed contractor's name will appear on the permit, and they are responsible for rough and final inspections. You can pull the overall Interior Alteration permit yourself if owner-builder, but plumbing and electrical permits must be in the contractor's name.

My contractor says we can skip the permit to save money. What are the real risks in Westmont?

Stop-work orders in Westmont carry $500–$1,500 fines plus mandatory double permit fees once you reapply. If unpermitted work is discovered during a refinance or home sale, your lender can require escrow holdback of $5,000–$15,000 until corrected. Home insurance may deny water-damage claims if traced to unpermitted bathroom work. Westmont Building Department is active in enforcement, especially for plumbing and electrical violations; the money saved upfront will cost 5–10x more to remedy.

How long does Westmont plan review take for bathroom permits?

Westmont's plan-review timeline averages 10–15 business days for bathroom permits, depending on completeness of submittals. Plumbing permits (with waterproofing details) take longest; electrical permits often clear in 5–10 days. If your initial submission is missing GFCI layout, waterproofing specs, or exhaust duct termination details, the examiner will issue a request for information (RFI), and review restarts when you resubmit—adding 5–10 days. Plan for 4–8 weeks from filing to final inspection.

What if I'm adding a second bathroom, not remodeling an existing one?

Adding a new bathroom (vs. remodeling existing) follows a different code path in Westmont and requires a full building permit plus plumbing and electrical permits. You'll need to show the new drain and vent routing on a plumbing plan, confirm the septic or sewer connection capacity (if on municipal sewage, Westmont may require a city approval), and provide framing and electrical plans. This is significantly more complex than a remodel and typically costs $800–$2,000 in permits plus possible site fees. Consult Westmont Building Department early.

Are there any Westmont-specific overlay districts (historic, flood, etc.) that affect bathroom permits?

Westmont has some historic district overlays in the older neighborhoods (central Westmont near the commuter rail). If your property is in a historic district, exterior changes (new windows, doors, siding) require Historic Preservation Commission approval, but interior bathroom remodels are generally not affected unless you're changing the exterior appearance (e.g., moving an exterior exhaust duct vent). Check the city website or ask Westmont Building Department if your address is in a historic district. Flood zones are less common in central Westmont but possible near the Des Plaines River; if your lot is in a floodplain, additional stormwater and foundation requirements may apply (less relevant to bathrooms, but worth verifying).

What's the final inspection process for a Westmont bathroom permit?

Final inspection includes: all fixtures installed and operational (toilet flushed, faucets running, shower sprayed), GFCI outlets tested with a test plug, exhaust fan running and venting outdoors (inspector may check with smoke or airflow meter), light fixtures secure and functional, and surface finishes (tile, paint, trim) complete. Inspectors will also spot-check that the waterproofing is sealed (especially at corners and transitions in the shower), that no damage or water intrusion is visible, and that any required permits are closed. The inspection takes 15–30 minutes. Once the inspector signs off, the permit closes and you can occupy the space.

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 Westmont Building Department before starting your project.

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