Bathroom Remodel Permit in New Lenox, IL (2026)

Research by DoINeedAPermit Research Team · Updated May 2026

The Short Answer

If you're relocating plumbing, adding electrical circuits, installing a new exhaust fan, or moving walls, you need a permit from the City of New Lenox Building Department. Cosmetic-only work—tile, vanity, faucet swap in place—is exempt.

New Lenox enforces Illinois Building Code (currently IBC 2021 with state amendments), which requires permits for any bathroom remodel that alters plumbing layout, electrical service, or ventilation. Unlike some collar-county suburbs that use more lenient local amendments, New Lenox applies the full state code without exception—meaning exhaust fan duct routing, GFCI outlet placement, and waterproofing assembly details all get formal plan review. The City of New Lenox Building Department processes permits online and requires sealed electrical and plumbing plans for fixture relocation, which adds 2–4 weeks to the timeline compared to over-the-counter approval in some nearby jurisdictions. New Lenox sits in the edge zone between climate 5A (north) and 4A (south), so frost depth—42 inches in the northern part of the city—affects any below-grade plumbing work. The key local variation: New Lenox does not offer a separate 'minor bathroom permit' category, so even a single-fixture relocation triggers a full permit with inspections, not an expedited pathway. Owner-occupants can pull permits directly without a licensed contractor, but plans still require a licensed plumber's seal if plumbing moves.

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

Stop-work order and $500–$1,500 fine from the City of New Lenox Building Department if discovered during an inspection or neighbor complaint, plus mandatory permit re-pull with double fees.
Insurance denial on water damage claims if an unpermitted bathroom (especially tub-to-shower conversion or new duct work) causes hidden mold or structural damage within 10 years.
Resale disclosure: Illinois requires sellers to disclose unpermitted work; buyers can demand remediation or price reduction, potentially costing $5,000–$15,000 to bring into compliance.
Lender or refinance block: Many lenders will not close on a home with unpermitted plumbing or electrical work; FHA loans specifically audit bathroom permits in the past 5 years.

New Lenox full bathroom remodel permits — the key details

New Lenox requires a building permit whenever you relocate any plumbing fixture (toilet, vanity, shower, tub), add or modify electrical circuits, install a new exhaust fan, or change the wall layout of a bathroom. The trigger is functional change, not cosmetic work. Per Illinois Building Code Section P2706, any relocated drain must maintain proper slope (1/4 inch per 1 foot) and trap arm length cannot exceed 3 feet 6 inches from the trap weir to the vent stack—a common rejection point when homeowners try to move a toilet far from the stack. If your plan shows a trap arm of 4 feet or more, the plan reviewers will require a re-route or secondary vent, adding cost and delay. New Lenox's building department reviews plans to confirm fixture placement is geometrically feasible before issuing a permit; this avoids expensive mid-construction surprises.

Electrical work in a bathroom bathroom remodel is heavily regulated under IBC/NEC 2020 Article 210 and 690. All outlets within 6 feet of a sink, tub, or shower must be GFCI-protected—either hardwired GFCI breakers or GFCI receptacles. If you're adding a new outlet or circuit, the electrical plan must show GFCI protection and clearly label it; New Lenox plan reviewers will red-flag any outlet shown in the bathroom without GFCI notation. Additionally, if your bathroom is in a closet or other enclosed space with a door, you must install an AFCI (arc-fault circuit interrupter) breaker on the lighting circuit. Many homeowners and small contractors miss the AFCI requirement and have to resubmit plans. The plan must be sealed by a licensed Illinois electrician if it involves any new circuits or relocation of existing circuits.

Ventilation is a critical failure point in New Lenox bathroom permits. Per IRC Section M1505, every bathroom with a shower or tub must have mechanical exhaust ventilation rated for the bathroom's square footage—typically 50 cubic feet per minute (CFM) for a 50-square-foot bath, or 150 CFM if there's a toilet in the room (many codes now require this higher standard). The exhaust duct must be insulated (R-4 minimum) if it runs through an unconditioned space, must terminate to the outside of the building (not into a soffit or attic), and must slope downward to allow condensation to drain back into the bathroom. New Lenox requires the exhaust fan location, duct routing, termination point, and CFM rating to be shown on the plan; if your plan shows the duct terminating into an attic or soffit, it will be rejected outright. A new exhaust fan install usually adds $100–$200 to the permit valuation but is non-negotiable if you're adding one.

Shower and tub waterproofing is where new bathroom remodels most often hit code conflicts. IRC Section R702.4.2 requires a continuous water-resistant membrane behind any tile in a shower or tub enclosure. The code does not specify cement board versus PVC versus liquid membrane, but New Lenox plan reviewers typically expect one of these three documented: (1) cement board (1/4 inch minimum) plus a sheet membrane (like RedGard or Kerdi), (2) zero-expansion PVC backer board like Durarock, or (3) a full liquid waterproofing system sealed to the subfloor and up 12 inches on all walls. If you submit a plan that just says 'tile on drywall,' it will be rejected. This is especially important if you're converting a bathtub to a shower, because the code's waterproofing requirement is much stricter for showers than for tubs. Tub conversions also often trigger the need for a shower threshold (3/8 inch maximum per ADA), which affects the floor framing if it's not already set up for it.

New Lenox permits are filed through the city's online portal (accessible from the New Lenox city website under 'Building Department'). You'll upload a site plan, floor plan showing the new fixture layout, electrical plan (if circuits change), and plumbing plan (if fixtures move). The city aims for a 2–3 week plan review for straightforward remodels, but can take 4–5 weeks if revisions are needed. Once approved, you get a permit card to post on the property. Rough plumbing inspection happens before drywall; rough electrical before drywall; then framing/drywall inspection (if applicable); then final plumbing and electrical. For a full bathroom gut, you'll typically have 4–5 inspections over 4–8 weeks. If you're just swapping a vanity or faucet in place without moving anything, no permit is needed—file this category as 'accessory work' mentally and proceed without contacting the city.

Three New Lenox bathroom remodel (full) scenarios

Scenario A

Toilet relocation, vanity swap in place, new GFCI outlet — Beacon Hill neighborhood

You're moving the toilet 3 feet to the opposite wall to make room for a larger vanity, keeping the vanity footprint in its current location, and adding one new GFCI outlet in a new location above the new vanity. The new toilet location is 2 feet 6 inches from the existing vent stack, which is within the 3 feet 6 inch trap arm maximum. You're not changing wall layout, not adding new circuits (just moving one outlet), and not changing exhaust fan. New Lenox requires a permit because the toilet relocation triggers plumbing review—the building department will verify the new trap arm length and slope on the floor plan. You'll need a sealed plumbing plan showing the new toilet location, vent routing, and supply lines. Electrical doesn't require a licensed seal if you're just moving an existing outlet, but the plan must show the new outlet location with GFCI notation. Permit cost is roughly $250–$350 based on a ~$5,000 project valuation. Plan review takes 2 weeks; rough plumbing inspection happens within 5 days of your request; final plumbing after tile/grouting is complete. No drywall inspection needed since you're not opening walls. Total permit timeline: 3–4 weeks from submission to occupancy sign-off.

Scenario B

Tub-to-shower conversion, new exhaust fan duct, wall relocation — South of 171st Street (climate 4A zone)

You're removing an existing bathtub, building a new shower enclosure 6 feet away in a corner, installing a new 150 CFM exhaust fan with ducting to the exterior (not the attic), and moving the south wall 2 feet outward to gain floor space. This is a full remodel trigger: plumbing fixture relocation, new exhaust fan with duct routing, structural wall move. New Lenox requires sealed plans from both a licensed plumber and structural engineer (because of the wall move). The plumbing plan must show the new shower trap location (trap arm cannot exceed 3 feet 6 inches from the vent), the new shower valve (must be pressure-balanced per IRC P2705), the drain slope, and the new water supply routing. The electrical plan must show GFCI protection for the new shower area outlet and also the new AFCI-protected lighting circuit (if the bathroom door closes). The waterproofing spec is critical: the plan must show either cement board + RedGard membrane, PVC backer board, or a comparable liquid system rated for the shower base and walls up to 12 inches above the enclosure. The exhaust fan plan must show the location (within 6 feet of the shower is preferred), the 150 CFM rating, the insulated duct routing to an exterior wall penetration, and the exterior termination cap (no soffit, no attic). Because you're south of 171st Street, New Lenox uses the 4A climate standard, which means 36-inch frost depth if there's any foundation work—check your floor plan. Permit cost is $500–$700 depending on scope. Plan review takes 3–4 weeks because two licensed seals are required and the reviewer must verify structural adequacy of the wall move. Rough inspections include framing, plumbing, electrical, and exhaust fan duct; final inspection after tile, fixtures, and exterior duct termination. Total timeline: 6–8 weeks from permit issuance to final approval.

Scenario C

New electrical circuit for heated floor, vanity and toilet replaced in-place, no plumbing moves — Pre-1978 home requiring lead testing

You're adding a dedicated 20-amp circuit for a radiant heated floor mat under tile, but keeping the toilet and vanity in their existing locations and not touching any plumbing. This scenario hinges on whether 'adding an electrical circuit' requires a permit in New Lenox. The answer: yes, if the circuit is hardwired (not plug-in), it requires a permit because you're modifying the service panel or adding a new breaker. If it's a plug-in heated mat that plugs into an existing outlet (which must be GFCI), then technically no permit is required—you're just adding an appliance. But New Lenox's online portal guidance says any 'new branch circuit installation' requires a permit and sealed electrical plan, so the safest path is to permit it. Permit cost is $150–$250. However, there's a wrinkle: your home was built before 1978, which means Illinois' lead-paint disclosure and testing rules apply. You must provide a lead disclosure form to the building department before they issue the permit, and if the permit involves disturbing any painted surfaces (opening walls, removing fixtures that were painted), you must hire a lead-certified contractor or complete EPA RRP training yourself. This doesn't stop the permit, but it adds cost and timeline if lead abatement is needed. Assuming no lead disturbance (just adding a floor mat circuit), plan review takes 1–2 weeks; rough electrical inspection within 5 days; final after the floor is installed. Total timeline: 2–3 weeks.

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Exhaust fan duct routing in New Lenox: common mistakes and code traps

New Lenox's plan reviewers flag exhaust fan duct termination more often than any other bathroom remodel issue. IRC M1505 is unambiguous: the duct must terminate to the outside of the building. Many homeowners and older contractors still think 'outside' means terminating in the soffit, attic, or crawlspace, but these all fail code. When moist bathroom air vents into an attic, it condenses on the underside of the roof decking and rafters, causing hidden mold and wood rot that won't show up for years. New Lenox's building department will reject any plan showing attic termination. The duct must go through an exterior wall or the roof decking itself, with a proper termination cap (usually a mushroom or dampered cap) on the outside.

The duct itself must be insulated if it runs through an unconditioned space—that is, R-4 minimum insulation value. This is to prevent condensation from forming inside the duct when warm, moist air hits a cold duct wall. In a climate 5A zone (most of New Lenox north of 171st Street), uninsulated flex duct in an unheated attic will sweat and drip water back into the bathroom; you'll see it as a slow water leak appearing months or years after the install. Homeowners often buy cheap, uninsulated aluminum flex duct at the big-box store and don't realize the code requirement. When the plan reviewer sees it, they'll require an upgraded duct or insulation wrap, adding $150–$300.

CFM capacity is also a source of rejection. A 50 CFM fan is appropriate for a 50-square-foot bathroom with no toilet; if your bathroom is 75 square feet or has a toilet, you need 150 CFM minimum. New Lenox reviewers will ask for the bathroom square footage on the plan and will verify the CFM rating of the fan being installed. If the plan doesn't list CFM or shows an undersized fan, it gets red-flagged. Matching the fan size to the bathroom is not optional—undersized exhaust is a code violation even if the duct runs to the exterior correctly.

Pre-1978 homes and lead paint: the hidden cost in New Lenox bathroom remodels

If your New Lenox home was built before 1978, you are legally required to disclose to the building department that lead paint may be present. Illinois Environmental Protection Act regulations require this disclosure for any permitted work in a pre-1978 home. The building department won't deny your permit because of lead, but they will require you to acknowledge the risk. If your remodel involves disturbing painted surfaces—opening walls, removing old fixtures, sanding, or scraping—you legally must hire a lead-certified contractor or complete EPA RRP (Renovation, Repair, and Painting) training yourself. This is federal law (not just New Lenox), enforced by the EPA.

The cost can be substantial. A lead-certified contractor will charge 20–50% more than a standard contractor because they must follow containment protocols, use HEPA-filter vacuums, and do waste disposal as hazardous material. For a full bathroom remodel involving plumbing relocation and wall opening, expect an additional $1,500–$3,000 if lead abatement is required. Many homeowners discover this requirement after they've already selected a non-certified contractor, forcing a change mid-project. The City of New Lenox's building permit portal has a lead disclosure form you must sign before permit issuance; use it as your checklist: if you're opening walls or disturbing painted surfaces, budget for certified work.

One silver lining: if you're doing surface-only work (tile, vanity, faucet swap in place, no wall opening), lead disclosure is still required but you don't trigger the RRP training requirement. This is why cosmetic-only bathroom updates—even if they require a permit for electrical reasons—may avoid the lead-certified contractor mandate. Check with New Lenox Building Department if you're unsure; they can clarify the threshold for your specific remodel.

City of New Lenox Building Department
City of New Lenox, New Lenox, IL (contact city hall main line for building department)
Phone: (815) 485-2193 (verify current number with city website) | https://www.newlenox.com (Building Department permit portal)
Monday–Friday, 8:00 AM–5:00 PM; closed city holidays

Common questions

Do I need a permit to replace my bathroom vanity and faucet in the same location?

No. Replacing fixtures in place—vanity, faucet, towel bars, mirrors—is considered accessory work and does not require a permit from New Lenox. You only need a permit if you are relocating the fixture to a new location, changing plumbing routing, or adding new electrical circuits. If you're swapping a vanity for an identical or similar one in the same footprint and connecting to the same supply and drain lines, you're exempt.

My bathroom is in the north part of New Lenox. What's the frost depth for my foundation, and does it affect my bathroom remodel?

New Lenox north of 171st Street is in climate zone 5A with a 42-inch frost depth. This matters only if you're doing major structural work or adding a new below-grade plumbing line (rare in a bathroom remodel). For a standard above-grade remodel, frost depth does not directly impact your permit. If you're moving a vent stack or drain line, the New Lenox building code requires proper slope and support, but frost depth doesn't change the rules—it's mainly a concern for foundation footings and exterior walls.

What exactly does 'sealed electrical plan' mean, and who can sign it?

A sealed electrical plan is a floor plan showing all electrical work (outlets, switches, circuits, breaker assignments) that is stamped and signed by a licensed Illinois electrician. Only a licensed electrician can seal the plan. New Lenox requires sealed plans for any new circuit addition or circuit relocation. If you're just moving an existing outlet (not adding a new circuit), some plan reviewers may accept an unsealed plan with clear outlet locations; call the building department to confirm. Many homeowners hire an electrician just to seal the plan; that seal typically costs $100–$200.

Can I do a tub-to-shower conversion without a permit if I use pre-made shower panels instead of tile?

No. The permit requirement is based on the functional change (removing a tub and installing a shower drain), not the material. Even if you use waterproof shower panels instead of tile, you still need a permit because you're relocating the fixture and changing the waterproofing assembly. Pre-made panels must still be inspected to ensure they meet IRC R702.4.2 waterproofing standards. New Lenox will require a permit and the plan must specify the panel system being used.

My toilet is 4 feet from the vent stack. Can I move it without a secondary vent line?

No. Per IRC P2706, trap arm length (measured from the trap weir to the vent stack) cannot exceed 3 feet 6 inches. If your new toilet location is 4 feet from the stack, the building department will require a secondary vent line (a 'relief vent' or 'revent') to be installed. This adds cost and complexity—expect $300–$800 in plumbing work. The New Lenox plan reviewer will catch this before construction starts, so don't assume you can move the toilet far from the stack.

Do I need a permit for a heated floor mat in my bathroom?

It depends on how it's powered. If it's a plug-in heated mat that plugs into an existing GFCI outlet, no permit is needed—it's an appliance. If it's hardwired into a new dedicated circuit with a breaker in your panel, yes, you need a permit and a sealed electrical plan. Most DIY heated floor installations are plug-in; if you're having an electrician hardwire it, ask if they're pulling a permit. New Lenox requires a permit for any new branch circuit addition.

What if my bathroom remodel involves opening a load-bearing wall?

Opening a load-bearing wall requires a sealed structural engineer's plan showing a header sized for the load. New Lenox will require this plan as part of the permit application. You cannot build the header yourself or assume a 2x12 is adequate; the engineer must calculate the load and header size. This adds 2–4 weeks to plan review because the structural review is separate from plumbing and electrical review. Budget $800–$1,500 for the structural engineer and $400–$600 for the header installation. Most bathroom remodels do not involve load-bearing walls, but if you're relocating walls, confirm with a contractor or engineer before applying for the permit.

Can an owner-builder (owner-occupant) pull a bathroom permit in New Lenox without hiring a licensed plumber?

Yes, owner-occupants can pull permits for owner-occupied homes in New Lenox. However, if your remodel involves plumbing fixture relocation, you must still file a sealed plumbing plan signed by a licensed plumber. You do not have to hire a plumber to do the work, but the plan must be sealed by one. Similarly, electrical work requires a sealed electrical plan. You can do the work yourself if you're licensed or trained, but the permitting stage requires licensed seals. Many homeowners hire a plumber just to review and seal the plan, separate from the installation work.

How long does the New Lenox building department take to review bathroom remodel plans?

Plan review typically takes 2–3 weeks for straightforward remodels (toilet relocation, vanity swap, new outlet). If the plan requires revision (rejected for waterproofing spec, trap arm length, GFCI notation, or exhaust duct termination), add 1–2 weeks for resubmission and re-review. Complex remodels (tub-to-shower conversion, wall relocation, structural work) take 3–4 weeks because multiple reviewers (plumbing, electrical, structural) must sign off. Once approved, inspection scheduling depends on contractor availability; rough plumbing is typically within 5 business days of request, and final inspection within 2–3 weeks after work is complete.

My home was built in 1975 and I'm doing a full bathroom gut. What's the lead paint process with New Lenox?

You must provide a lead disclosure to New Lenox before permit issuance. Since you're doing a full gut involving wall opening and fixture removal, any disturbed painted surfaces fall under EPA RRP rules. You must either hire a lead-certified contractor (who will follow containment and waste-disposal protocols) or complete EPA RRP training yourself. RRP training costs $200–$400 and takes one day; a certified contractor adds 20–50% to labor costs but handles compliance. Your New Lenox permit application will have a lead disclosure form—fill it out honestly, and the building department will guide you to the next step.

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 New Lenox Building Department before starting your project.

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