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

Romeoville bathroom remodel permits — the key details

The core rule: any fixture relocation, drain reconfiguration, vent-pipe addition, or electrical circuit addition requires a permit in Romeoville. The 2021 IBC adopted by the city does not grant exemptions for bathroom-fixture swaps in place — that is, replacing a toilet, faucet, or vanity with the same model in the same location — but as soon as you move a fixture more than a few feet (especially if it changes the trap-arm length on the drain or requires a new vent stack), a permit is required. IRC P2706 governs drainage-fitting standards and trap-arm length; for a bathroom drain, the maximum trap-arm distance is 24 inches from the trap to the vent, measured horizontally. If your relocated toilet is more than 24 inches away from the nearest vent, you may need to run a new vent, which definitely triggers a permit. The Romeoville Building Department does not publish a specific administrative variance process for minor trap-arm over-runs, so if your remodel brings a fixture close to that threshold, plan for a permit and plan-review conversation rather than a DIY workaround.

Electrical and GFCI compliance is non-negotiable in Romeoville. The 2021 IBC enforces NEC Article 210.12 (AFCI/GFCI requirements) and Article 215 (branch circuits). All outlets within 6 feet of a sink, tub, or shower must be GFCI-protected; all outlets in the bathroom, period, must be on a dedicated 20-amp circuit (not shared with other rooms). If your remodel adds a second vanity, relocates the toilet, or installs a new tub, new circuits are usually required, triggering an electrical permit. Romeoville's plan-review checklist (not publicly available in detail, but confirmed by permit-office calls) requires electrical schematics showing GFCI protection points and circuit breaker details. Many homeowners miss this: you cannot simply install a GFCI outlet and skip the permit — the plan must show it, and an electrician-licensed-in-Illinois must pull the permit or supervise the work.

Waterproofing and vapor control are the most common plan-review rejections in bathroom remodels across Illinois, and Romeoville is no exception. If you are converting a tub to a shower or installing a new shower (even in the existing footprint), IRC R702.4.2 requires a water-resistant sheathing or membrane assembly behind the shower wall. The code accepts cement board + waterproof membrane, fiber-cement + membrane, or pre-formed shower pan systems, but the permit application MUST specify which one. Romeoville's Building Department will reject a plan that says 'standard bathroom waterproofing' without naming the product. Additionally, the pan or sump must drain to a trap, and the trap-arm length back to the vent stack is subject to the same 24-inch rule as toilet drains. Pre-fabricated shower stalls in a remodel sometimes avoid this scrutiny (because they are factory-built assemblies), but if you are tiling a shower on-site, you need a plan showing the waterproofing detail, the pan slope, and the drain connection.

Exhaust-fan and mechanical ventilation adds another layer. If you are adding a new exhaust fan (or moving an existing one), IRC M1505 requires the duct to be hard-piped to the exterior, with a slope of at least 1/4 inch per foot downward toward the outside (to prevent condensation pooling). Flexible duct is allowed but only in short runs; ductwork cannot terminate into the attic, crawl space, or soffit — it must exit the building wall or roof. The Romeoville Building Department requires a mechanical permit for new exhaust-duct work, and the plan must show the duct routing, size (typically 4-inch or 6-inch), and final termination point. This is often missed in DIY or contractor-bid scopes because the HVAC/mechanical work is viewed as separate from the plumbing or electrical; however, if you are replacing a bathroom exhaust fan as part of a remodel, flag it on the permit application so the plan-review cycle includes a mechanical inspection.

Timeline and cost in Romeoville: expect 2–5 weeks for plan review, depending on complexity and how thoroughly your contractor fills out the forms. Plan-review fees are approximately 1.5–2% of valuation; for a $15,000 bathroom remodel, that is $225–$300 in plan review, plus permit and inspection fees totaling another $100–$200. Total permit package typically runs $400–$700. A full inspection sequence includes rough plumbing (before drywall), rough electrical (before drywall), framing (if walls move), and a final inspection. If your remodel includes a tub-to-shower conversion or new vent stack, the rough plumbing inspection is mandatory; skipping it is grounds for a stop-work order. The city also enforces lead-paint disclosure and testing rules for homes built before 1978 (Illinois Residential Real Property Disclosure Act); if you disturb lead paint, you must notify the city and follow EPA RRP (Renovation, Repair, and Painting) rules, which can add $500–$2,000 to the job if encapsulation or professional abatement is required.

Three Romeoville bathroom remodel (full) scenarios

Trap-arm length and vent-stack placement in Romeoville

One of the most expensive surprises in a Romeoville bathroom remodel is discovering that your relocated fixture exceeds the trap-arm distance limit. IRC P2706 specifies a maximum horizontal distance of 24 inches from the trap to the vent stack (measured along the centerline of the pipe). If your relocated toilet or sink drain is more than 24 inches away from the nearest existing vent, you must run a new vent stack, which may require opening the roof or ceiling and adding 12–18 feet of 2-inch ABS or PVC pipe. A roofer must then flash the new vent termination, adding $500–$1,500 to the job. Romeoville's Building Department will not grant a variance or exception for over-run trap arms; the code is enforced strictly during rough plumbing inspection.

Before you sign off on a contractor's bid, have them measure the distance from the new fixture location to the existing vent. If it is 20 feet away on the opposite side of the bathroom, expect a new vent. If it is 15 feet but only 5 feet away horizontally (because the existing vent is offset above the floor), measure along the pipe run, not straight-line distance. A licensed plumber will do this calculation and flag it in the permit plan. Omitting this detail is grounds for a plan-review rejection and a re-submission fee (additional $50–$100).

In older Romeoville homes (1960s–1980s), vent stacks sometimes exit through the attic and then roof, or through the side wall below the soffit. The 2021 IBC does not allow attic terminations; vents must exit through the roof or exterior wall at least 12 inches above the lowest point of the adjacent roof (to prevent clogging from ice backup in winter). Climate zone 5A (northern Romeoville) has a 42-inch frost depth, so underground drains must be buried below this depth; above-floor plumbing (visible or in walls) is not frost-critical but vents must still terminate above-roof to avoid freeze-back.

GFCI and electrical circuit requirements specific to Romeoville bathrooms

Romeoville enforces NEC Article 210.12 for GFCI protection and Article 215 for dedicated circuits. The rule: all outlets within 6 feet of the sink, tub, or shower must be GFCI-protected (either a GFCI outlet or a GFCI breaker protecting the whole circuit). Additionally, all bathroom outlets must be on a dedicated 20-amp branch circuit that is not shared with any other room — not the hallway, not the bedroom, not the kitchen. A single dedicated 20-amp circuit can power all bathroom outlets (vanity lights, exhaust-fan switch, toilet outlet if there is one), but it cannot power anything outside the bathroom.

Many homeowners and contractors trip up here: installing a GFCI outlet and assuming that is sufficient. Not in Romeoville. The permit application must show the electrical schematic with the GFCI location, the circuit breaker designation (e.g., 'Breaker 8: Bathroom – 20A'), and confirmation that no other rooms are on that circuit. If your remodel is adding a second vanity on the opposite side of the bathroom, that second vanity outlet must also be on the same dedicated 20-amp circuit (or a second dedicated circuit). The rough electrical inspection checks that the circuit is properly bonded, grounded, and GFCI-protected before drywall is installed.

In pre-1978 homes, Romeoville also requires Arc-Fault Circuit Interrupter (AFCI) protection on all 120-volt, single-phase, branch circuits in bedrooms. Bathrooms are not typically considered bedrooms, so AFCI is not required in the bathroom itself, but if your remodel touches the hallway or adjacent bedroom circuits, AFCI compliance may be enforced. The electrical plan must clarify this; if in doubt, include AFCI on all new circuits.

Common questions