Bathroom Remodel Permit in Niles, IL (2026)

Research by DoINeedAPermit Research Team · Updated May 2026

The Short Answer

Any full bathroom remodel involving fixture relocation, new electrical circuits, exhaust fan ducting, or wall changes requires a permit from the City of Niles Building Department. Surface-only work — tile, vanity, or faucet replacement in place — does not.

Niles, like its Chicago neighbors, enforces the 2021 Illinois Building Code (which adopts the IRC) and requires permits for plumbing, electrical, and structural bathroom changes. What sets Niles apart is its streamlined over-the-counter permit intake for residential projects under $50,000 — most bathroom remodels fall here and can be approved same-day or within 2–3 business days if the application is complete, versus the 5–7 day review cycle in some collar suburbs. Niles also maintains a shared plan-review portal with the Cook County Health Department for projects near the Des Plaines River floodway or in the city's water protection overlay; if your property sits in either, expect an extra 1–2 weeks for environmental sign-off. Unlike some suburbs, Niles does not require a separate mechanical permit for exhaust fans under 1,200 CFM — that gets bundled into the plumbing permit, which saves a filing fee and simplifies scheduling. Lead-paint disclosure and safe renovation practices apply to all pre-1978 homes; the Illinois EPA enforces this at the state level, but Niles inspectors will flag non-compliant work.

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

Stop-work orders cost $300–$1,500 in Niles violation fines, plus you must re-pull the permit and pay standard fees; any unpermitted work must be removed or brought into compliance at your expense.
Insurance claims for water damage, electrical fire, or mold linked to unpermitted bathroom work are routinely denied — your homeowner's policy specifically excludes coverage for code violations.
Selling your home triggers a Title 8 disclosure: unpermitted bathroom work must be revealed to buyers in Illinois, which kills 30–50% of deals or forces a $10,000–$30,000 price concession.
Lenders (mortgage or HELOC) will not refinance or approve a second mortgage on a home with known unpermitted work; you're locked out of equity until it's fixed and sign-off is obtained.

Niles bathroom remodel permits — the key details

The threshold for a bathroom permit in Niles is straightforward: if you are moving any plumbing fixture (toilet, sink, tub, shower), adding new electrical circuits, installing a new exhaust fan, changing the tub-to-shower configuration, or removing/relocating walls, you need a permit. The 2021 Illinois Building Code, which Niles adopts, does not exempt 'minor' work — the exception list is narrow. Replacing a faucet in the same sink location, swapping a vanity for a similar one without plumbing changes, or re-tiling an existing shower wall without touching the waterproofing assembly are all permit-exempt. The City of Niles Building Department is the sole issuing authority; there is no separate county permit for residential bathroom work in Cook County. Niles processes permits through its online portal (via the city website, niles-il.org) or in person at the Community Development Department counter (520 N. Prospect Ave., during business hours). Expect a $300–$800 permit fee, typically calculated as 1.5–2% of the project valuation; a $25,000 gut remodel falls into the $375–$500 range.

Electrical requirements in a bathroom remodel are strict and trip up many homeowners. Every bathroom outlet must be GFCI-protected per NEC 210.8(A)(1); in Niles, this means either a GFCI receptacle or a whole-circuit GFCI breaker. If you are adding a new exhaust fan, it typically requires its own 20-amp circuit (though some smaller fans can share a lighting circuit if downstream of GFCI). Any switch that controls a fan or light within 60 inches of a sink or tub must also be AFCI-protected as of 2021 code adoption in Niles. The electrical plan you submit must show all outlet locations, circuit routing, GFCI/AFCI devices, and fan connection; many rejections occur because the plan omits one of these. If you hire a licensed electrician, they'll handle the plan; if you pull the permit as owner-builder (Niles allows this for owner-occupied homes), you must either draft the plan yourself or hire a designer. The rough electrical inspection occurs before drywall, and the final inspection verifies all outlets, switches, and the exhaust fan duct termination.

Plumbing changes in a bathroom remodel require attention to trap-arm length, vent sizing, and drainage slope. Per IRC P2706, a trap arm (the horizontal pipe from the fixture to the vent) cannot exceed a length determined by the pipe diameter: for a 1.5-inch drain (common for sinks), the max trap arm is 30 inches; for a 2-inch drain (toilet or tub), it's 5 feet. If you are relocating a toilet or tub to a distant wall, this limit often forces you to move the vent stack or install a new branch vent, which adds cost and complexity. Shower drains are 2 inches, and if you are converting a tub to a shower, you may need a new drain line routed to the main stack — this is a common source of cost overruns. The waterproofing assembly for a tub or shower enclosure is mandated by IRC R702.4.2: a membrane system (liquid, sheet, or fabric-reinforced) must cover the substrate (tile backer board or cement board) and extend 6 inches above the tub rim and 12 inches above the shower threshold. If you are installing a prefabricated shower stall (all-in-one unit), it is exempt from the waterproofing membrane rule — a significant advantage if space and budget are tight. The rough plumbing inspection occurs before walls are closed, and the final plumbing inspection confirms all connections, traps, vents, and waterproofing. Niles allows owner-builders to pull plumbing permits; you will need a diagram showing fixture locations, trap-arm lengths, and vent routes.

Exhaust fan ventilation is governed by IRC M1505 and is a frequent violation in Niles permits. The fan must be sized to deliver at least 20 CFM per linear foot of tub or shower, or 50 CFM minimum for a toilet room. The duct must be rigid or semi-rigid (not flex alone) and must terminate outside the building envelope, not into an attic or crawlspace — many amateur installations dump the duct into the attic, which causes moisture accumulation and mold. Niles inspectors verify duct termination at the final inspection and may request photos of the exterior vent hood. If the bathroom is interior (no exterior wall), you'll need a longer duct run or may need to install a through-roof termination, which costs more and requires roofing permits. The permit plan must show fan location, CFM, duct size and routing, and exterior termination point. This is easy to overlook in a quick permit application but will result in a rejection or failed final.

Timeline and inspection sequence in Niles: once your permit is approved (typically 1–3 business days for over-the-counter residential permits), you can begin work. Inspections are called in by you (or your contractor) via the online portal or phone. Rough plumbing inspection occurs before walls are framed or closed; rough electrical before drywall; framing/structural inspection if walls are moved (required for any bearing wall removal — rare in bathrooms, but critical if present). Drywall inspection is optional for cosmetic remodels but required if full gut. Final inspection verifies all finish work, waterproofing, fixtures, outlets, switches, and vent termination. Niles typically schedules inspections within 2–3 business days of request. If you fail an inspection, you correct the issue and request a re-inspection; repeat failures can trigger a stop-work order. Total project timeline from permit to final approval is usually 4–8 weeks, depending on the scope and inspection schedule. Owner-builders can pull permits but must be present at inspections or designate a representative.

Three Niles bathroom remodel (full) scenarios

Scenario A

Vanity and toilet swap, new tile, same locations — Lincolnwood-area ranch, 1972

You are replacing a 30-inch vanity with a new 36-inch vanity in the same footprint, swapping the toilet for a new one in the same location, and retiling the floor and shower surround. No plumbing lines move, no new electrical circuits, no structural changes. This is a permit-exempt surface remodel. You do not need a City of Niles permit, and you can buy materials and start work immediately. However, because your home was built in 1972, Illinois lead-paint safe renovation rules apply: if you are disturbing paint or drywall (which you are, during demolition), you must follow EPA RRP rules — wet methods, containment, HEPA filtering, cleanup verification. This is not a permit, but it is a compliance requirement; hire an EPA-certified renovator or contractor, or take the one-time RRP certification course yourself ($200–$300). If you skip RRP and an inspector finds lead dust, you can be fined $16,000+ by the EPA. The tile and vanity work itself costs $4,000–$8,000; add $800–$1,500 for RRP-compliant demolition and cleanup. No permit fees. Final note: if you are removing the existing toilet, check the wax ring and flange; if the flange is cracked or sits below floor level, this is a quick plumbing fix while you have the floor opened — many homeowners seize this moment to upgrade.

Permit exempt | RRP certification required (pre-1978 home) | EPA fines $16,000+ if non-compliant | Materials + labor $4,000–$8,000 | RRP-compliant work $800–$1,500

Scenario B

Tub-to-shower conversion, new exhaust fan duct, wall tile — 1960s Niles ranch, same corner bathroom

You are removing a built-in 5-foot tub and installing a 3x5 walk-in shower in the same alcove. This is a fixture relocation in the plumbing sense — the drain and supply lines must be rerouted — and the waterproofing assembly changes (tub surround with caulk to full shower pan with membrane). You also discover the existing exhaust fan duct terminates in the attic (a code violation); you will install a new semi-rigid duct routed through the soffit to the exterior. This requires a permit. The Niles Building Department processes this as a plumbing + mechanical + general remodel permit bundle; you file once and get one permit number. Permit fee is approximately $400–$500, based on a ~$15,000 project valuation. The drain for the shower requires a 2-inch line sloped 1/4 inch per foot to the main stack or a branch vent; if the existing tub drain runs to a far stack, you may need to cut a hole in the rim joist or install a new P-trap with an in-line vent — these decisions are flagged during rough plumbing inspection. The shower waterproofing plan must specify the membrane system (e.g., 'Schluter Systems Kerdi membrane with fabric-reinforced corners' or 'liquid-applied polyurethane per ANSI A118.10'). The exhaust fan plan shows the duct routed to exterior soffit termination, sized for the room (typically 50–80 CFM for a 5x8 bathroom). Rough plumbing inspection before walls close, rough mechanical inspection for the duct, then final inspection verifying waterproofing, fixtures, and exterior vent hood. Lead-paint rules apply if pre-1978. Total project cost $12,000–$20,000; permit fees $400–$500; timeline 6–8 weeks.

Scenario C

Dual vanity, new electrical, relocating toilet and sink to opposite wall — Evanston-area colonial, master bath

You are gutting a 12x10 master bathroom: removing the existing single vanity, toilet, and tub; installing a 5-foot dual-sink vanity on one wall; a new tub on the opposite wall; and the toilet relocated to a corner. New supply and drain lines are routed through walls and under the floor. Two new electrical circuits are added (one for the dual vanity outlets and lights, one for a heated towel rack and new exhaust fan). A new ceiling-mounted exhaust fan with ductwork is installed, vented through the soffit. Walls are moved slightly to accommodate the new layout (non-bearing partition). This is a full permit scope. You file a plumbing permit, electrical permit, and general remodel permit; Niles allows you to file a single combined application. Permit fees total $500–$800, calculated as 2% of the ~$25,000–$30,000 valuation. The plumbing work requires careful trap-arm length planning: if the toilet is relocated 10 feet from the main stack, the trap arm alone cannot exceed 5 feet per code, so the vent must be looped back sooner, likely requiring additional rough-in work. The dual vanity adds complexity — two separate 1.5-inch drains may require a manifold before feeding a single 2-inch line, or each drain feeds its own P-trap. The electrician must pull two 20-amp circuits and GFCI-protect all outlets. The ceiling fan duct must be semi-rigid and routed to exterior termination (not attic). Plan review takes 3–5 business days; rejections often cite missing trap-arm dimensions or incomplete duct routing. Rough plumbing, rough electrical, rough mechanical (for the duct), and framing inspections occur in sequence. Final inspection confirms all finish work, waterproofing, outlets, switches, and exterior vent hood. If this is a pre-1978 home, RRP applies. Lead dust from demolition is a high-risk issue; hire RRP-certified contractors. Total project cost $22,000–$32,000; permits $500–$800; timeline 8–10 weeks.

Every project is different.

Get your exact answer →

Takes 60 seconds · Personalized to your address

Waterproofing and shower pan requirements in Niles — where most remodels fail inspection

IRC R702.4.2 mandates a waterproofing membrane for all tub and shower enclosures, and this is the single most common rejection in Niles bathroom permits. The membrane must cover the substrate (typically cement board or tile backer board) and extend 6 inches above the tub rim and 12 inches above a shower threshold. Many homeowners and even some contractors install tile directly over drywall or drywall tape, which violates code and will be caught at the final inspection — the wall must then be opened, drywall removed, cement board installed, membrane applied, and tile re-done. This costs an extra $2,000–$4,000 in rework. Niles inspectors specifically look for membrane evidence: they may pull back tiles or ask for product documentation (Schluter, Wedi, Hydro Ban, or liquid-applied systems all comply). If you use a prefabricated shower stall (an all-in-one fiberglass or acrylic unit), the membrane requirement is waived — the manufacturer's installation instructions become the code. Liquid-applied membranes (spray or brush-on polyurethane) are faster and cheaper than sheet membranes but require careful coverage and curing time; sheet membranes (Schluter Kerdi or fabric-reinforced) are easier for a DIYer to verify. Whatever system you choose, specify it by name and product number on your permit application.

Shower pan slope is equally critical. The floor of a shower stall must slope toward the drain at a minimum slope of 1/4 inch per foot; a 3-foot-wide shower must drop 3/4 inch from the back wall to the drain. Many remodelers use a sloped subfloor (mortar bed or pre-sloped pan liner) to achieve this; others use adjustable drain rings. If the slope is insufficient or nonexistent, water pools around the drain, seeps under the tile, and rots the substrate — mold follows. Niles inspectors may ask for a slope verification (a level and tape measure check before final tile) if the pan looks flat. This is a 'call-in' before final, not a major re-work, but it delays closure.

Lead-paint disclosure is mandatory for pre-1978 homes in Niles. The Illinois EPA enforces RRP (Renovation, Repair, and Painting) rule compliance, which requires EPA-certified renovators, containment, wet work methods, and third-party clearance verification. Many bathroom remodels involve disturbing plaster, drywall, tile adhesive, or paint — all potential lead sources. If you are a homeowner doing your own work, you must take the EPA RRP certification course (one-time, online, ~4 hours, $200–$300 fee). If you hire a contractor, they must be EPA-certified and carry liability insurance. Niles permit applications do not explicitly require RRP proof, but inspectors will ask during site visits if the home is pre-1978 and remodeling is underway. Non-compliance can trigger an EPA fine ($16,000+) and project suspension.

Niles permitting workflow and owner-builder path — when to file and what to expect

Niles allows owner-builders to pull residential permits for owner-occupied properties — you do not need to hire a licensed contractor for the permit itself (though you may hire subs to perform work). The process starts at the City of Niles Community Development Department (520 N. Prospect Ave., Niles, IL 60714) or online via the city portal. Bring or upload a completed application form, a site plan showing the lot and address, and a scope of work description. For a full bathroom remodel, the Department requests plumbing and electrical plans. The plumbing plan should show fixture locations (toilet, sink, tub/shower), drain lines, supply lines, trap-arm lengths, and vent routing. The electrical plan should show outlet and switch locations, circuit routing, GFCI/AFCI devices, exhaust fan connection, and any new circuits. If you are uncomfortable drafting these plans, hire a designer or engineer; costs range from $300–$800 for a residential bathroom plan set. Many Niles contractors will provide plans as part of their bid; if you are owner-building, check if a local design service offers template plans for common remodels.

Once you submit the application and plans, the Community Development Department reviews for completeness (typically 1–2 business days). If the application is complete and the project is under $50,000, it is often approved same-day or within 2–3 business days — an advantage of Niles' streamlined intake process. If the application is incomplete, you'll receive a rejection email listing missing items (e.g., 'trap-arm dimensions not shown' or 'exhaust duct termination unclear'); resubmit with corrections. Once approved, you pay the permit fee and receive a permit number. You then schedule inspections by calling or using the online portal. Niles inspectors are available Mon–Fri during standard business hours; they typically respond within 2–3 business days of your inspection request. If you fail an inspection, correct the violation and request a re-inspect; repeat failures can trigger a stop-work order and increased scrutiny. Total time from application to final approval is usually 4–8 weeks, depending on inspection scheduling and any re-work needed.

Owner-builders should budget time for learning code and staying present. You must be available for inspections or designate a representative to meet the inspector. The inspector will walk the site, verify compliance with the permit plans and code, and either approve the phase or issue a correction notice. Common issues caught at rough plumbing include trap-arm length violations, missing vents, or insufficient slope. Common electrical issues are missing GFCI/AFCI labeling or improper circuit sizing. If you are unfamiliar with these details, hire subs to do the work and ensure they pull trade-specific permits (some Niles contractors pull separate plumbing and electrical permits; others request a combined permit). A good contractor will manage inspections and re-work; an owner-builder must track these themselves. Start the permit process early — do not assume you can begin work before approval is issued. Niles enforces start-date rules: work begun without an issued permit triggers a violation notice and may require removal or remediation.

City of Niles Community Development Department (Building Division)
520 N. Prospect Ave., Niles, IL 60714
Phone: (847) 588-8000 (main number; ask for Building Department) | https://www.niles-il.org/residents/permits-licenses (permit applications and portal access)
Monday–Friday, 8:00 AM–5:00 PM (verify hours on city website)

Common questions

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

No. Replacing a toilet in place (same flange location) is permit-exempt. You only need a permit if you are relocating the toilet to a new spot on the floor, which requires new supply and drain lines. If the flange is damaged or sits below floor level, this is a quick fix while you have the toilet removed — it is still considered in-place replacement, not relocation.

What is the cost of a typical bathroom remodel permit in Niles?

Permit fees range from $300–$800, depending on the project valuation. Niles calculates fees as approximately 1.5–2% of the project valuation: a $15,000 remodel is about $225–$300 in permits; a $25,000 remodel is $375–$500. Fees are due when the permit is issued, not when you apply. Request an estimate during your pre-application conversation with the Building Department.

Can I do the work myself as the homeowner, or do I need a licensed contractor?

Niles allows owner-builders to pull permits for owner-occupied homes and to perform plumbing and electrical work themselves if they hold the permits. However, many jurisdictions require licensed plumbers and electricians — Niles is relatively permissive, but verify with the Building Department before you start. You must still pull permits and pass inspections. If you hire subs, they may be required to hold licenses; ask the contractor and Building Department.

How long does plan review take for a bathroom remodel permit in Niles?

For residential projects under $50,000, Niles typically approves over-the-counter permits within 1–3 business days if the application is complete. If the application is missing details (trap-arm dimensions, duct routing, electrical schematic), expect a rejection with a 5–7 day turnaround once you resubmit. Full plan review by an engineer or architect (rare for bathrooms) can take 2–3 weeks.

Do I need a separate mechanical permit for the exhaust fan?

No. Niles bundles exhaust fan installation into the plumbing permit for residential bathroom remodels under 1,200 CFM (which covers most homes). You do not pay a separate mechanical permit fee. The duct and termination are shown on the plumbing plan and inspected as part of the rough and final inspections.

What happens if I convert a tub to a shower — is there a special requirement?

Yes, a tub-to-shower conversion requires a permit because it involves changing the waterproofing assembly (from a tub surround with caulk to a full shower pan with a membrane). The new shower must have a waterproofing membrane per IRC R702.4.2 extending 12 inches above the threshold, cement board substrate, and a sloped pan (1/4 inch per foot). Prefabricated shower stalls are exempt from the membrane rule. The drain may need to be rerouted, which adds plumbing complexity and cost.

My home was built in 1975. Do I need lead-safe renovation training?

Yes. Illinois EPA RRP rules apply to homes built before 1978. If you are disturbing paint, drywall, or tile during your bathroom remodel, you must hire an EPA-certified renovator or complete the EPA RRP certification course yourself (~4 hours, $200–$300, one-time). Non-compliance can result in EPA fines of $16,000+. This is separate from the building permit but is a legal requirement.

Can I install a bathroom exhaust fan that vents into my attic?

No. Per IRC M1505, exhaust fans must be ducted to the exterior of the building, not into an attic or crawlspace. Venting into the attic causes moisture accumulation, mold, and rot. Niles inspectors verify exterior termination at the final inspection. If your attic is your only option, you'll need a roof termination (which requires roofing permits and flashing work) or a longer duct run to a wall vent.

How many inspections do I need for a full bathroom remodel?

Typical inspection sequence for a full remodel is: rough plumbing, rough electrical, rough mechanical (for exhaust duct), framing (if walls move), drywall (optional for cosmetic remodels), and final inspection. That's 4–6 inspections depending on scope. You call in each inspection once the phase is complete; Niles typically schedules within 2–3 business days. Failed inspections require correction and re-inspection, which adds time.

If I skip the permit and do unpermitted bathroom work, what are the real consequences?

Multiple risks: (1) Stop-work orders and $300–$1,500 in violation fines; (2) Insurance denial if water damage or electrical fire occurs related to unpermitted work; (3) Mandatory Title 8 disclosure when selling — unpermitted bathrooms must be revealed to buyers, which kills 30–50% of deals or drops the price $10,000–$30,000; (4) Lender refusal to refinance or provide a HELOC until the work is permitted and sign-off obtained. Unpermitted work is expensive to remedy after the fact.

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 Niles Building Department before starting your project.

More permit guides

National guides for the most-asked homeowner permit projects. Each goes deep on code thresholds, common rejections, fees, and timeline.

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