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

Highland Park bathroom remodel permits — the key details

The threshold for a Highland Park bathroom permit is straightforward: if you move any plumbing fixture (toilet, sink, tub, shower), add a new electrical circuit, install a new exhaust fan with ductwork, change the tub/shower configuration (including waterproofing), or relocate walls, you need a permit. The city does NOT require a permit for cosmetic-only work—replacing a toilet in its existing location, swapping a vanity (same rough-in), or retiling walls without touching plumbing. However, the city's definition of 'cosmetic' is strict: if your vanity move involves moving the sink drain or supply lines even 6 inches horizontally, that's a fixture relocation and triggers a permit. The reason is IRC P2706 (drainage-fitting requirements) and local amendments requiring an inspector to verify trap-arm length, slope, and vent alignment. Many homeowners call the Building Department thinking their 'small' sink relocation is exempt, only to discover mid-project that Highland Park's inspectors require full plumbing plans if any drain or vent is touched. The moral: when in doubt, call the Building Department (phone number available via Highland Park's official city website) before demolition starts.

Electrical work in a bathroom remodel is where Highland Park's code gets stricter than the state minimum. Any new circuit must include Arc-Fault Circuit Interrupter (AFCI) protection on 20-amp bathroom branches per NEC 210.12(B); the city's permit staff verify this on your electrical plan before approval. Additionally, all outlets within 6 feet of a sink, tub, or shower must have Ground-Fault Circuit Interrupter (GFCI) protection per IRC E3902.1. Highland Park also requires a dedicated 20-amp circuit for bathroom outlets (not shared with other rooms), and if your remodel adds a second bathroom or bathroom-adjacent outlet, the city's electrical inspector will check that the circuit count matches your panel capacity. If you're upgrading from 100-amp to 200-amp service as part of the remodel, that's a separate electrical permit (roughly $250–$400). Many homeowners underestimate the cost of bringing old panel layouts into compliance—add $800–$1,500 for a licensed electrician to run new circuits and label the panel according to Highland Park's standards.

Plumbing fixtures must comply with IRC P2706 and local amendments regarding trap-arm length and vent sizing. When you relocate a toilet or sink drain in Highland Park, the inspector will measure the distance from the trap to the vent stack—that distance cannot exceed 30 inches horizontally (per IRC P3201.7), and the slope must be 1/4 inch per foot minimum. If your bathroom layout forces the trap arm to exceed the code length, you'll need a separate vent loop or branch vent, which adds $200–$500 in labor and materials. Tub or shower drains fall under the same rule. The city's plumbing inspectors are experienced with older North Shore homes (many built in the 1920s–1960s with cast-iron or clay drains), so they often ask for scope photos of the existing drain before you demolish walls. A common rejection: failing to submit a plumbing riser diagram showing trap-arm lengths and vent connections; the city will ask you to redraw and resubmit, delaying your review by 1–2 weeks.

Bathroom ventilation (exhaust fans) requires either IRC M1505.2 (mechanical exhaust fan ducted to exterior, minimum 50 CFM for a bathroom under 100 sq ft, 100 CFM if larger) or natural ventilation (operable window at least 10% of floor area, rare in full remodels). If you're adding or relocating an exhaust fan, the permit must include a ducting schematic showing the duct diameter, insulation type, termination location (soffit or roof, not attic or crawl space—Highland Park enforces this strictly due to moisture risk in the climate zone 5A winters), and the fan's CFM rating. A common mistake: installing an exhaust fan duct that terminates in the attic or soffit cavity instead of through the exterior wall or roof. Highland Park's inspector will fail the rough-electrical inspection if the duct termination isn't visible on the submitted plan. The cost of a proper ducting run (including damper and exterior trim) is $300–$800; many contractors underestimate this and then face re-work charges.

Waterproofing in shower or tub remodels is a frequent point of failure in Highland Park plan review. The city requires you to specify the waterproofing assembly: either cement board (per ASTM C1288) with a liquid or sheet membrane (per ASTM D4897 or D4541), or a pre-fabricated waterproofing system (e.g., Schluter, Wedi, Curbless). If your plans say 'standard shower' without specifying the waterproofing, the city will reject and ask you to resubmit with product specs and installation details. Lead-paint rules add complexity: if your home was built before 1978 and you're disturbing interior plaster or drywall (even if you're not removing walls, just opening walls for plumbing), Highland Park requires lead-safe work practices per EPA RRP Rule. Hire a certified lead-safe contractor for demolition, or complete the EPA RRP training yourself ($300–$500 online course). If you don't, the city can fine you $250–$1,000 and require you to hire a certified contractor retroactively. The permit fee reflects valuation: Highland Park typically charges 0.8–1.5% of the project cost for a bathroom permit (roughly $200–$800 for a $20,000–$50,000 remodel). Request a fee estimate from the Building Department before you pull the permit; they'll provide a ballpark based on your scope and materials list.

Three Highland Park bathroom remodel (full) scenarios