Bathroom Remodel Permit in Grayslake, IL (2026)

Research by DoINeedAPermit Research Team · Updated May 2026

The Short Answer

A full bathroom remodel needs a permit if you're relocating fixtures, adding electrical circuits, installing new exhaust ventilation, converting a tub to shower, or moving walls. Surface-only work (tile, vanity swap in place, faucet replacement) does not.

Grayslake enforces the 2021 Illinois Building Code (which adopted the 2021 IBC/IRC), and the City of Grayslake Building Department processes bathroom permits through its online portal or over-the-counter filing at city hall. What distinguishes Grayslake from neighboring communities like Antioch or Round Lake Beach is Grayslake's specific plan-review timeline: full bathroom remodels typically see 2–4 week reviews for projects with fixture relocation or wall changes, but the city offers over-the-counter approval (same-day sign-off) for cosmetic-only bathroom work — tile, vanity replacement in place, faucet swap — if you can demonstrate no plumbing or electrical changes. Grayslake also sits in Climate Zone 5A (northern Illinois), which means 42-inch frost depth and glacial-till soils; this affects any drain-line work or new vent-stack routing. Lead-paint disclosure requirements apply to pre-1978 homes. If you're adding a bathroom (not remodeling an existing one), the scope and permit cost jump significantly — that's a different code path entirely.

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

Stop-work order: City inspector catches unpermitted work during a routine complaint or neighbor tip, issues a stop-work notice, and demands a retroactive permit ($200–$800 base fee, often doubled for unpermitted work).
Insurance and lender denial: Unpermitted plumbing or electrical work voids many homeowner insurance claims; lenders will halt refinance or HELOC approval if title search flags unpermitted work.
Resale disclosure hit: Illinois Residential Real Property Disclosure Act requires sellers to disclose unpermitted work; buyer can demand remediation, price reduction, or walk away — easily $5,000–$15,000 loss.
Forced removal and re-work: If waterproofing or electrical does not meet code (e.g., shower enclosure without proper membrane, GFCI missing), city may require tear-out and rebuild at your cost ($3,000–$8,000+ labor).

Grayslake bathroom remodel permits — the key details

The defining rule: any relocation of a plumbing fixture (toilet, sink, shower/tub), any new electrical circuit or outlet, any new exhaust duct, or any wall demolition/framing requires a permit in Grayslake. The 2021 IRC Section P2706 governs drainage-fitting materials (DWV cast iron, PVC, or approved ABS), and Section M1505 sets exhaust-fan ventilation: a minimum 50 CFM intermittent fan or 20 CFM continuous, ducted to the exterior (not into an attic or soffit). IRC Section E3902 requires all bathroom outlets to be GFCI-protected; if you're adding circuits or outlets, your electrical plan must call out GFCI receptacles or AFCI breakers. Shower and tub enclosures fall under IRC Section R702.4.2: waterproofing is mandatory, and the code specifies cement board or equivalent (KERDI, Schluter, or similar membrane system) behind all tile. Grayslake's plan-review team will scrutinize waterproofing details on your permit drawings — 'tile shower' is not enough; you must specify the assembly (cement board 1/2-inch minimum, top coat). Many homeowners skip this detail and face rejection letters.

Grayslake's online permit portal, accessible through the city's website, allows you to file applications 24/7; however, bathrooms with fixture relocation or wall work must include a site plan (showing bathroom location in home), floor plan (pre and post layout), electrical plan (outlet locations, GFCI calls), plumbing isometric (rough-in heights, trap-arm lengths, vent routing), and a detailed waterproofing spec. If you're converting a tub to a shower, include the new shower enclosure detail (membrane type, curb height, drain location). Over-the-counter cosmetic-only permits (vanity swap, tile re-do in place, faucet replacement) can often be approved same-day by the building clerk if you can produce a signed affidavit stating no plumbing, electrical, or framing changes occur. This is a huge time-saver if your project truly is cosmetic; many homeowners miss this shortcut and assume they need a full 3-week review when a 10-minute over-the-counter stamp suffices.

Grayslake's frost depth is 42 inches (matching Chicago's standard), which matters if you're roughing in a new drain line or vent stack that exits the home — the code requires the drain slope to account for soil freeze-thaw in a glacial-till terrain. If you're tying into an existing drain line, make sure the trap-arm length does not exceed 3 feet 6 inches (IRC P3201.7); longer trap arms require a vent-loop or separate vent. This is a common rejection point because homeowners move a toilet across a bathroom without re-venting, and the inspector catches a 5-foot trap run. Vent termination must be 12 inches above the roof line, in unobstructed airspace, per IRC M1805 — not hidden under a soffit or terminating into a gable vent. If your exhaust fan duct is longer than 25 feet or has more than two 90-degree elbows, Grayslake's inspectors will ask for a larger fan (higher CFM) or revised routing. Specify fan details on your permit plan to avoid field changes.

Lead paint rules apply to any bathroom in a pre-1978 home: you are required by federal law (EPA RRP Rule) to use a certified lead-safe contractor or attend RRP training yourself if you are an owner-builder doing the work. Grayslake does not enforce lead-paint certifications, but your contractor's insurance and EPA rules do; many homeowners discover this late and must hire a licensed lead-safe firm, adding $1,500–$3,000 to the project. If you do not address lead paint in your permit application, you risk a federal fine (not a city fine, but real). Owner-builders are allowed in Grayslake for owner-occupied single-family homes, but you must pull the permit yourself; you cannot hire an unlicensed contractor to do the work under your name. If you hire a contractor, the contractor must be licensed by the State of Illinois (ICCB residential contractor license or equivalent plumbing/electrical licenses). Grayslake inspectors will verify contractor licensing at rough-in inspection.

Inspection sequence for a full bathroom remodel typically runs: rough plumbing (drain/vent/supply lines, before in-wall), rough electrical (new circuits, outlets, GFCI points, before drywall), framing (if walls are moved — often skipped if existing studs are reused), drywall/waterproofing (once framing is signed off, your waterproofing membrane must be visible and approved before tile or other wall covering), and final (fixtures installed, GFCI testing, exhaust fan duct sealed and termination verified). Each inspection carries a standard fee (often bundled into the permit base fee of $200–$800, depending on valuation — typically 1.5–2% of project cost). Plan 2–4 weeks from submission to first rough inspection, assuming no rejection letters for missing details. If your plan is incomplete (missing waterproofing spec, no electrical detail, no vent routing), you'll receive a rejection email; resubmit corrected plans, and the clock restarts. This delay is avoidable with thorough pre-submission prep.

Three Grayslake bathroom remodel (full) scenarios

Scenario A

Cosmetic-only bathroom refresh: new tile, vanity, faucet in place, no plumbing moves or electrical work (typical 1980s ranch, Grayslake).

You are removing and replacing tile in a shower alcove, installing a new vanity in the same location, and swapping out the faucet — all in-place work with no drain or supply relocation. This is the classic over-the-counter exemption in Grayslake. You do not need a permit, do not need plan drawings, and do not need an inspection. However, if the existing tile sits on drywall (not cement board), and you want to install new tile properly, you may choose to install cement board before tiling — this is cosmetic work, not a code violation, but adds labor cost (roughly $200–$400 for materials and installation in a typical 40-square-foot bathroom). If your old vanity had a plumbing trap arm that was longer than code or poorly sloped, replacing the vanity in the exact same spot does not trigger a permit because you are not changing the drain-line run. The moment you move the toilet, sink, or tub even a few feet, you cross into permit territory. Many homeowners mistakenly think 'new fixtures' automatically requires a permit; it does not — only relocation does. Estimated cost: $3,000–$7,000 materials and labor, zero permit fees.

No permit required (cosmetic only) | Over-the-counter sign-off available at city hall | Cement board optional but recommended | Zero inspection required | Total project cost $3,000–$7,000

Scenario B

Mid-scope remodel: moving toilet 4 feet to adjacent wall, new exhaust fan with 20-foot ductwork, adding GFCI outlet for heated floor mat, existing shower enclosure stays in place (typical 2000s-era Grayslake colonial).

The toilet relocation requires a new drain run, new trap arm, and likely new vent connection — all three trigger a plumbing permit. The 20-foot exhaust duct is within code length (under 25 feet with appropriate fan CFM), but must be ducted to the exterior with an exterior termination cap (not soffit or interior chase). The new GFCI outlet for the heated mat requires a dedicated circuit or addition to an existing bathroom circuit, which requires an electrical permit. In Grayslake, you file one master bathroom remodel permit that covers both plumbing and electrical; you do not file separate applications. Your permit package must include: a floor plan showing old and new toilet location (dimensions and rough-in measurements), an isometric plumbing diagram showing the new drain slope, trap-arm length (max 3 feet 6 inches per IRC P3201.7), vent routing to the roof, a one-line electrical diagram showing the new outlet and GFCI protection, and an exhaust-fan spec sheet with duct-length and termination detail. The waterproofing in the existing shower does not change, so you do not need a shower-detail drawing unless the existing enclosure is being rebuilt. Plan-review timeline: 3–4 weeks. Rough plumbing inspection: city inspector verifies trap slope (1/4 inch per foot minimum), trap-arm length, vent routing, and drain material (PVC or DWV approved). Rough electrical inspection: GFCI outlet confirmed, circuit breaker GFCI or receptacle-level GFCI verified. Exhaust-fan duct must be in place and sealed (no return-air leakage). Final inspection: toilet installed and caulked, GFCI outlet tested, exhaust fan operational and duct termination verified. Permit fee estimate: $400–$700 (1.5–2% of estimated $25,000–$35,000 project cost). Lead-paint certification required if pre-1978 home.

Scenario C

Full gut remodel: relocating shower/tub to opposite wall, moving toilet and sink, removing and rebuilding shower waterproofing (cement board + membrane), new exhaust fan, new electrical subpanel outlet, wall framing to accommodate layout changes (pre-1960 Grayslake cottage).

This is a comprehensive bathroom remodel requiring full plumbing, electrical, and structural permits under Grayslake code. The relocation of the shower (which involves demolishing the existing enclosure and rebuilding with new waterproofing) is the most code-intensive element: IRC R702.4.2 mandates a waterproofing assembly behind all tile, and Grayslake inspectors will require you to specify the membrane type on your permit drawings — typical options are 1/2-inch cement board + liquid membrane (Redgard, Chloraloy, or equivalent), or a pre-formed membrane system (KERDI, Schluter, or Wedi). The city will reject your plan if you write 'tile shower' without the assembly detail. You must also include a shower-curb detail (height, slope, drain invert elevation). The new toilet and sink locations require new drain runs, new trap arms, and new vent stacks. If these vents exit through the roof, they must be 12 inches above the roof line and positioned in unobstructed airspace (not near a ridge vent or soffit). The toilet rough-in height is 12 inches from finished floor to the center of the flange; verify existing framing can accommodate this, or note wall framing changes on your plan. The wall framing changes (to move studs for new fixture locations) require a structural review; in Grayslake, this is typically part of the general building permit, not a separate structural application, but the inspector will verify that you are not removing load-bearing walls (or if you are, that a header is installed per IRC R602.7 for the span and load). Your permit package must include: a full-scale bathroom floor plan (pre and post), a plumbing isometric showing all drain/vent/supply routing with elevations and slope callouts, an electrical one-line with GFCI/AFCI protection, a detailed shower-enclosure section (showing cement board, membrane, tile, and drain), a framing plan if studs are relocated, and an exhaust-fan spec. Plan-review timeline: 4–6 weeks (longer due to structural and waterproofing complexity). Inspections: framing (before drywall, if walls are moved), rough plumbing, rough electrical, drywall/waterproofing (membrane visible before tile), final. Permit fee estimate: $600–$1,200 (1.5–2% of $40,000–$60,000+ project cost). Lead-paint certification required if pre-1978 (most likely for a cottage-era home). Owner-builder permitted if owner-occupied, but plumbing and electrical rough-ins must pass city inspection; you can do the finish work (tile, trim) yourself but cannot sign off on the plumbing/electrical unless you are a licensed contractor. Total timeline: 6–10 weeks from permit submission to final inspection clearance.

Permit required (comprehensive remodel) | Waterproofing detail (cement board + membrane) mandatory on plan | Shower-curb section required | Plumbing isometric, electrical one-line, framing plan required | Rough framing, rough plumbing, rough electrical, waterproofing, final inspections | 4–6 week plan review | $600–$1,200 permit fee | Lead-paint certification required for pre-1978 | 6–10 week total timeline

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Waterproofing and the bathroom wall assembly: why Grayslake inspectors scrutinize this detail

IRC Section R702.4.2 requires waterproofing in showers and tub enclosures — specifically, a moisture barrier behind tile or other finishes on walls surrounding the bathing area. Grayslake enforces this by requiring the waterproofing assembly to be specified and visible during the drywall/waterproofing inspection phase. The most common assembly is 1/2-inch cement board (ASTM C1288 or equivalent) fastened to studs with cement-board screws every 8 inches, then topped with a liquid waterproofing membrane (Redgard, Chloraloy, Schluter Kerdi, or equivalent product) rolled or sprayed onto the board and extending 6 inches above the tub or shower pan edge. Some jurisdictions allow drywall with a liquid membrane as a substitute for cement board, but Grayslake's inspectors typically prefer cement board because it resists water absorption and mold growth better than drywall.

If you specify the assembly on your permit plan, the inspector will look for it during the rough phase (studs visible), sign off on the cement board fastening and overlap, and then return during drywall/finish to verify the membrane is applied and sealed at all corners, edges, and penetrations (faucet escutcheons, drain, etc.). If you do not specify the assembly on your plan and instead attempt a tile-on-drywall install, the inspector will stop the final inspection and require tear-out and re-work — a $2,000–$4,000 correction cost. Many homeowners think 'I'll just use waterproofing primer under the tile' or assume their contractor will sort it out, but code is explicit: the membrane must be specified and inspected.

Pre-manufactured membranes like KERDI or Schluter Shower Pan systems are also code-compliant and often faster to install because they are pre-formed and do not require a separate membrane coat; however, they cost more upfront ($8–$12 per square foot vs. $2–$3 for cement board + liquid membrane). Grayslake does not show a preference between systems, only that the assembly meets R702.4.2. If your bathroom has an existing tile shower that is leaking (water damage behind the tile), do not assume a new tile job and waterproofing primer will fix it — you will need to tear to the studs and rebuild the full waterproofing assembly, or the leak will return. This is a common cause of failed inspections because homeowners try to gloss over the waterproofing rebuild and only replace tile.

Electrical GFCI and AFCI requirements in bathrooms: code changes and Grayslake enforcement

The 2021 IRC Section E3902 requires all outlets within 6 feet of a sink or bathing area (tub, shower) to be GFCI-protected. This means either a GFCI receptacle (the 'smart' outlet with a test button) or GFCI protection at the circuit breaker level. Many homeowners assume one GFCI outlet near the sink is enough, but code actually requires every outlet in the bathroom (including outlets outside the 6-foot sink zone, if the bathroom is small) to be GFCI-protected. If you are adding a new outlet for a heated floor mat, heated towel rack, or exhaust-fan motor, that outlet must also be GFCI-protected. Grayslake's electrical inspector will test all bathroom outlets with a GFCI tester during the rough electrical and final inspections; if an outlet fails the test (no GFCI protection), the inspector will flag it as a correction.

A newer code requirement (adopted in the 2020 NEC, referenced in the 2021 IRC) mandates AFCI (Arc-Fault Circuit Interrupter) protection for all bedroom and bathroom circuits, not just outlets. AFCI breakers detect dangerous arcing faults (often caused by damaged wire insulation or nail strikes) and shut off the circuit before a fire starts. If you are adding a new bathroom circuit, Grayslake's inspector will verify the breaker is an AFCI type (not just a standard breaker with a GFCI outlet). This is a point of confusion because homeowners hear 'GFCI' and think it covers AFCI as well, but they are different: GFCI protects against shock (ground faults), AFCI protects against fire (arcing faults). Specify both on your electrical plan to pass inspection smoothly.

If your bathroom has an older electrical panel with limited space or if adding a new circuit requires panel upgrades, budget $500–$1,500 for the electrician to install a new breaker or add a sub-panel. Grayslake does not require permits for internal electrical work (wire runs, outlets, breakers within a single panel), but if your electrician must upgrade the service entrance or add a sub-panel, a separate electrical permit for that work may be required. Verify with the city's building clerk before starting; this is often a 1–2 week process and can delay your project.

City of Grayslake Building Department
10 South Seymour Avenue, Grayslake, IL 60030 (contact city hall for exact department location and hours)
Phone: (847) 548-2000 (main city line; ask for building/permit services) | https://www.grayslakeil.gov/ (search for 'permits' or 'building permits' on city website for online portal access)
Monday–Friday, 8:00 AM–5:00 PM (verify with city; some departments offer limited in-person hours)

Common questions

Does replacing a toilet in the same spot require a permit in Grayslake?

No. Replacing a toilet, sink, or faucet in the same location is a fixture replacement and does not require a permit. However, if you are relocating the toilet (moving it to a new spot on the wall or floor), a permit is required because you must install new drain, vent, and supply lines. Many homeowners confuse 'new fixture' with 'relocated fixture' — only relocation triggers a permit.

I'm converting my tub to a shower in Grayslake — do I need a permit?

Yes. A tub-to-shower conversion changes the waterproofing assembly and drain configuration (different trap and vent routing), so it requires a plumbing permit. You must specify the new shower waterproofing detail (cement board + membrane or equivalent) on your permit plan. The city's inspector will verify the waterproofing assembly during the rough and drywall phases. This is a common remodel and typically takes 3–4 weeks for plan review.

What is the cost of a bathroom remodel permit in Grayslake?

Permit fees in Grayslake are typically 1.5–2% of the project valuation, ranging from $200–$800 for bathroom remodels. A cosmetic remodel (tile, vanity swap in place, no fixture relocation) is exempt. A mid-scope remodel with fixture relocation and new electrical ($25,000–$35,000 project) runs $400–$700 in permit fees. A full gut remodel ($40,000–$60,000+) runs $600–$1,200. Fees do not include inspection charges, which are often bundled into the permit base fee; confirm with the building clerk at time of filing.

Do I need a contractor license to do bathroom remodel work in Grayslake if I am the homeowner?

You may pull the permit yourself as an owner-builder (for an owner-occupied single-family home in Grayslake), but any contractor you hire must be licensed by the State of Illinois (ICCB residential contractor, plumber, or electrician). Grayslake inspectors verify contractor licenses during rough-in inspections. If you perform the work yourself, you are allowed, but you must pass all required inspections. Lead-paint certification (EPA RRP) is required if your home was built before 1978.

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

Cosmetic-only remodels (no permit required) have no review time — over-the-counter approval at city hall, often same-day. Mid-scope remodels with fixture relocation and electrical work typically see 3–4 week review times. Full gut remodels with waterproofing detail, framing changes, and structural review take 4–6 weeks. Incomplete plans (missing waterproofing spec, no electrical detail) receive rejection letters and restart the clock upon resubmission. Submit complete, detailed plans to avoid delays.

Can I install a shower without cement board waterproofing in Grayslake?

No. IRC Section R702.4.2, which Grayslake enforces, requires a waterproofing assembly (cement board + membrane or equivalent pre-formed system) behind all tile in showers and tubs. Tile on drywall alone does not meet code. Grayslake inspectors will flag this during the waterproofing inspection phase and require tear-out and re-work if not corrected. Specify the waterproofing assembly on your permit plan to avoid this costly correction.

My house was built in 1965 — does that affect my bathroom remodel permit in Grayslake?

Yes, in one key way: lead-paint rules. Homes built before 1978 are presumed to contain lead paint, and the EPA RRP Rule requires a certified lead-safe contractor or RRP-trained owner to perform any renovation work (including tile removal, wall demolition). Grayslake does not enforce lead-paint compliance directly, but EPA fines are significant ($16,000+ per violation), and your contractor's insurance will not cover unpermitted lead work. Budget $1,500–$3,000 for a certified lead-safe contractor if you hire out, or take the EPA RRP course yourself. Structurally, older homes may have outdated plumbing or electrical; verify with rough inspections that existing lines meet current code before finalizing layouts.

What is the maximum length of an exhaust-fan duct before I need a larger fan in Grayslake?

Exhaust-fan ducts under 25 feet with no more than two 90-degree elbows can use a standard 50-80 CFM bathroom exhaust fan (per IRC M1505). If your duct run exceeds 25 feet, has more than two elbows, or is rigid metal duct, you must upsize the fan (e.g., 90–100 CFM) or revise the routing to shorten the run. Specify duct length and fan CFM on your permit plan; Grayslake inspectors will verify the duct is sealed, insulated (to avoid condensation), and terminated to the exterior with a hood cap (not soffit or interior return).

If I do not pull a permit for my bathroom remodel and Grayslake finds out, what happens?

A stop-work order will be issued, work must halt immediately, and you will be required to pull a retroactive permit (often charged at double the original fee, $400–$1,600+). If plumbing or electrical does not meet code, you may be forced to tear out and rebuild ($3,000–$8,000+ cost). Insurance claims for any water damage or electrical issues will likely be denied. When you sell your home, unpermitted work must be disclosed under Illinois law; buyers can demand remediation or price reduction (potentially $5,000–$15,000 loss). Refinancing or HELOC approval may be blocked if the lender discovers unpermitted work during title review. Pulling the permit upfront is far cheaper and simpler.

Can I file my bathroom remodel permit online in Grayslake, or do I need to go in person?

Grayslake offers online permit filing through its city website portal, accessible 24/7. You can upload floor plans, drawings, and specifications electronically. However, cosmetic-only permits can often be signed off over-the-counter at city hall (10 South Seymour Avenue) by the building clerk during business hours (Mon–Fri 8 AM–5 PM, verify locally). For projects requiring plan review (fixture relocation, electrical work, waterproofing detail), online filing is faster than in-person submission; expect email responses during plan-review phase. Contact the building department directly for the portal link and filing instructions.

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 Grayslake Building Department before starting your project.

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