Bathroom Remodel Permit in Vernon Hills, IL (2026)

Research by DoINeedAPermit Research Team · Updated May 2026

The Short Answer

A full bathroom remodel in Vernon Hills requires a permit if you are relocating any plumbing fixture, adding electrical circuits, converting a tub to shower, installing a new exhaust duct, or moving walls. Surface-only work—tile, vanity swap, faucet replacement in-place—is exempt.

Vernon Hills Building Department enforces the 2021 Illinois Building Code (based on the 2021 International Building Code), and their plan-review process is notably stricter than some neighboring municipalities on waterproofing specifications for shower and tub assemblies. Unlike some collar-county towns that accept generic 'cement board and membrane' language, Vernon Hills examiners require detailed product names and installation sequences on the bathroom plan—they cite IRC R702.4.2 explicitly and will bounce plans that don't specify whether you're using a preformed pan liner, a liquid-applied membrane system, or a fabric-reinforced cement board assembly with tape and mud. This city also enforces the 42-inch frost depth (per IRC R403.1 footing depth for the Chicago zone) and requires that any relocated drain line maintain proper slope and trap-arm length under code limits, which matters if your bathroom sits over a crawlspace or sump pit. The city's online portal allows e-filing for most projects, and typical bathroom remodel permits are processed over-the-counter or in a 2-3 week plan-review cycle if submitted complete; incomplete submittals (missing electrical GFCI/AFCI diagrams, duct termination details, or waterproofing specs) routinely require a resubmittal loop, adding 1-2 weeks. Owner-occupants can pull permits themselves, but many choose to file through their contractor to avoid delays.

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

Vernon Hills Building Department investigates unpermitted work via neighbor complaints or discovery during property transfers; stop-work orders carry $100–$300 fines per day of violation, and you'll owe double permit fees ($400–$1,600 for a typical full bath) to legalize the work after the fact.
Insurance claims for water damage, electrical fires, or mold remediation can be denied if the bathroom remodel was not permitted, leaving you liable for $5,000–$50,000+ in remediation costs.
Selling your home triggers a title-company title search that flags unpermitted work; buyers require a permit or a costly retroactive inspection and sign-off, often killing the sale or forcing a price drop of 2-5%.
Refinancing or taking a home equity loan requires a title search; unpermitted bathroom work can block the loan closing, and lenders may require you to demolish and redo the work to code before funding.

Vernon Hills bathroom remodel permits — the key details

Vernon Hills requires a building permit for any bathroom remodel that involves fixture relocation, electrical work beyond replacing a light fixture, plumbing modifications, or structural changes. The core rule is found in the 2021 Illinois Building Code adoption, which incorporates IRC P2706 (drainage system fittings), IRC E3902 (ground-fault circuit-interrupter protection in bathrooms), IRC M1505 (exhaust fan ventilation requirements), and IRC R702.4.2 (waterproofing of shower and tub enclosures). The city interprets 'waterproofing' strictly: if you're installing a new shower or converting a tub to shower, you must submit a detailed waterproofing plan identifying the specific product system (for example, 'Schluter-Kerdi fabric membrane over cement board with Schluter profiles' or 'Noble Seal liquid-applied membrane under tile') and the installation sequence. Generic language like 'waterproof the shower walls' will be rejected. Permits are not required for cosmetic work such as replacing tile without moving the tub or shower valve, swapping out a vanity in the same location, or replacing a faucet, toilet seat, or light fixture.

The permit application process in Vernon Hills begins with an online portal submission (available at the city's website under Building Permits) or in-person filing at City Hall. The application requires a description of work, estimated project valuation, and—for any plumbing, electrical, or structural changes—a set of plans or a detailed scope document. For a typical full bathroom remodel involving fixture relocation and electrical upgrades, the city requests a floor plan showing old and new fixture locations, a one-line electrical diagram showing circuits and GFCI/AFCI placement, and a detail drawing or product spec sheet for shower waterproofing. The city's examiners (part of the Building Department) conduct a completeness review within 2-3 business days; if plans are incomplete, they issue a 'request for additional information' (RAI) via email, and you have 10 business days to respond. A complete resubmittal typically requires 1-2 weeks of additional review. Once approved, the permit is issued, and you can begin work.

Plumbing requirements for Vernon Hills bathroom remodels hinge on IRC P2706 and the city's enforcement of proper drain slopes and trap-arm lengths. If you are relocating any fixture—toilet, sink, shower valve, or floor drain—the new drain line must be sized per code (typically 1.5-inch for sink drain, 3-inch for toilet, 2-inch for shower pan drain), slope downward at a minimum 1/4 inch per foot, and connect to the main stack or branch line within maximum trap-arm lengths (usually 3 feet for a toilet, 5-6 feet for a sink, 8 feet for a shower). Vernon Hills examiners will require you to show how the new drain line meets these requirements; if the new location is far from the existing stack (e.g., you're moving the sink to the opposite wall), you may need to fur out walls, reroute ductwork, or add a new vent stack, all of which increase costs and complexity. The city's 42-inch frost depth means that any floor-level work in a basement or crawlspace must account for seasonal water table rise and proper slope away from footings.

Electrical and ventilation work in Vernon Hills bathrooms triggers both 2021 Illinois Building Code (NEC 2020 adoption) and the city's interpretation of GFCI and AFCI protection. IRC E3902 requires all outlets in a bathroom to be protected by ground-fault circuit interrupters (GFCI); this protection can be provided by a GFCI receptacle, a GFCI breaker, or a standard receptacle downstream of a GFCI outlet. Additionally, any new circuits you add (for heated floors, exhaust fans, lighting, or electric towel warmers) must be on a dedicated 20-amp circuit per code, and if the bathroom is served by a bedroom circuit, the city may require arc-fault circuit-interrupter (AFCI) protection on that circuit as well. For exhaust fans, IRC M1505 specifies that the duct must be sized to match the fan CFM (typically 50-100 CFM for a bathroom, per square footage), terminate to the exterior (not an attic or unconditioned space), and slope downward to drain condensation. Vernon Hills examiners expect to see the exhaust duct termination point shown on your plan—whether it's a soffit vent, roof penetration, or wall-mounted through-duct cap—and they will reject plans that show the duct terminating into an attic or venting into a soffit without proper dampers.

Timelines and costs for Vernon Hills bathroom remodel permits typically follow this sequence: permit application and plan review (2-3 weeks for a complete submission), rough plumbing inspection (1 week after you call for inspection), rough electrical inspection (concurrent with rough plumbing), and final inspection (after all finishes are complete). Permit fees are based on the 'valuation' of the project—the estimated cost of the remodel. Vernon Hills uses a standard fee schedule of approximately 1.5-2% of project valuation, capped at a reasonable maximum. A $15,000 full bathroom remodel would generate a permit fee of roughly $225–$300; a $25,000 remodel would be $375–$500. Additional fees apply if you request expedited review (typically +25-50% of base fee for 1-week turnaround). Owner-occupants can pull their own permit and hire licensed contractors for specific trades (plumbing, electrical); the city does not require the permit applicant to be licensed, but all plumbing and electrical work must be performed by licensed Illinois plumbers and electricians, and those contractors must pull a separate trade permit. If you hire a general contractor, they typically handle all permitting and filing; clarify this during your contract negotiation.

Three Vernon Hills bathroom remodel (full) scenarios

Scenario A

Master bathroom vanity and toilet replacement in-place, same wall, no fixture movement — Maplebrook subdivision ranch

You're replacing the existing vanity, sink, faucet, and toilet with new models in the same locations along the same wall. The old vanity is 48 inches wide; the new vanity is 60 inches wide, but it's centered in the same wall cavity. You're not moving the drain line, not adding new circuits (the existing outlet is GFCI and you'll use it for the new vanity), and not touching the vent stack. This is surface-only work: remove old fixtures, patch drywall as needed, install new vanity and trim. Per city guidelines, this work is exempt from permitting because no plumbing fixture is being relocated and no new electrical circuits are being added. However, if the new vanity location requires rerouting the supply lines more than a few feet (e.g., shifting the centerline of the sink), or if you're upgrading the faucet to a motion-sensor or touchless model that requires a dedicated outlet, you would then trigger an electrical permit because a new circuit might be needed. Assuming traditional plumbing and faucet: no permit, no inspections, no city involvement. Cost is purely labor and materials: $1,500–$4,000 for vanity, sink, faucet, and installation. One note: if this home was built before 1978, lead-paint disclosure rules apply to any renovation disturbing painted surfaces, but that's a disclosure matter, not a permit matter.

No permit required (in-place replacement) | Supply/drain routing unchanged | GFCI outlet verified | Total project $1,500–$4,000 | No permit fees

Scenario B

Full bathroom remodel: tub-to-shower conversion, new vanity location, exhaust fan duct extension — downtown Vernon Hills colonial condo

You're gutting the bathroom: removing an old cast-iron tub from the north wall and installing a new 36x60-inch tile shower on the same wall (tub-to-shower conversion). You're moving the vanity from the east wall to the west wall (new drain and supply lines required). You're installing a new exhaust fan with a 4-inch duct that will route through the attic and terminate at a roof-mounted cap. This is a full remodel requiring a permit because (1) you're relocating plumbing fixtures (vanity), (2) you're converting a tub to a shower, triggering IRC R702.4.2 waterproofing requirements, and (3) you're adding a new exhaust duct. The permit application must include a floor plan showing old and new locations, a waterproofing detail for the shower (product name, membrane type, installation sequence), electrical diagram showing GFCI outlets and the new exhaust fan circuit, and a duct diagram showing the duct path, slope, and roof-termination detail. Vernon Hills examiners will require that your waterproofing spec be explicit—for example, 'Wedi shower system with pre-sloped base pan, acrylic coating, and tile over' or 'Schluter-Kerdi fabric membrane, thinset adhesive, and porcelain tile.' The vanity drain must be routed to maintain proper slope and trap-arm length; depending on the layout, you may need to fur out the west wall or add a new vent vent. The exhaust duct must be 4-inch diameter, slope downward at least 1/4 inch per 10 feet toward a drain point (to avoid condensation pooling), and terminate at a roof cap with a damper or soffit vent. Plan review typically takes 2-3 weeks; if waterproofing or duct details are missing, expect an RAI and a 1-2 week resubmittal cycle. Inspections: rough plumbing (before walls are framed/covered), rough electrical (before drywall), framing (if any wall adjustments), and final inspection after tile and fixtures are installed. Permit fee is approximately $300–$500 based on estimated project valuation ($18,000–$25,000 for a full bath remodel). Condo-specific note: Vernon Hills condos often have HOA architectural-review requirements that run parallel to the city permit; coordinate with your HOA before filing to avoid conflicts.

Scenario C

Powder room remodel: toilet relocation, wall removal, new electrical circuits, no shower — Westchester suburb split-level

Your half-bath (powder room) has a toilet and small sink on the east wall. You're removing the wall between the powder room and an adjacent closet to create a larger bathroom, relocating the toilet to the north wall, installing a new 24-inch vanity and sink on the west wall, and adding a heated-floor mat with its own 20-amp circuit and a new exhaust fan. This triggers multiple permit requirements: (1) wall removal requires a structural permit because you must determine if the wall is load-bearing and, if so, install a header; (2) fixture relocation (toilet and sink) requires plumbing review; (3) new electrical circuits (heated floor and exhaust fan) require electrical review and GFCI/AFCI diagram. The wall removal is the complexity here. Vernon Hills Building Department requires that any wall removal be accompanied by a structural engineer's assessment or a pre-engineered header sizing (based on 2021 IBC load tables). If the wall is load-bearing, you'll need a header sized for the span; if not, you can remove it with standard framing. The permit must include a floor plan showing the wall removal and new fixture locations, a structural detail or engineer's stamp on the header, an electrical one-line showing the new circuits, and a waterproofing detail if you're adding a shower (you're not, so that's simpler here). The relocated toilet drain must maintain proper slope and trap-arm length from the existing stack; depending on the distance, you may need to bore through or under the new wall, which adds plumbing cost. Permit fee is approximately $350–$600 based on valuation ($20,000–$28,000 full remodel plus structural work). Inspections: structural (wall framing before drywall), rough plumbing, rough electrical, and final. Timeline is 3-4 weeks plan review plus the wall-framing inspection sequence. Split-level note: Vernon Hills split-level homes often sit on hillside lots or have sloped crawlspaces; ensure the new drain slope doesn't conflict with existing HVAC ductwork or foundation details when rerouting plumbing.

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Waterproofing specifications: why Vernon Hills examiners demand product names

Vernon Hills' strict waterproofing requirement stems from high water-table conditions in parts of the suburb due to glacial-till soil and seasonal groundwater rise. The city has seen litigation and damage claims from failed shower waterproofing systems over the past decade, and as a result, the Building Department now requires applicants to specify exactly which waterproofing product and method they will use—not generic descriptions. IRC R702.4.2 states that shower and tub enclosures must have a water-resistive or waterproof backing; the code allows multiple methods: a pre-formed shower pan, a fabric-reinforced cement board with waterproof coating, a peel-and-stick membrane over cement board, or a liquid-applied membrane system. Vernon Hills examiners reject plans that simply say 'waterproof membrane under tile' because that term encompasses dozens of incompatible systems, and if something fails, the city has no way to verify that the installed product matched the permit.

When you submit your bathroom remodel permit, specify the waterproofing system by name and brand. Examples that will pass: 'Schluter-Kerdi fabric membrane, extended 6 inches up walls, adhered with thin-set per manufacturer; tile set over Schluter thin-set.' Or: 'Wedi pre-sloped shower base pan, acrylic waterproof coating on vertical surfaces, tile with modified thin-set.' Or: 'Hydro Ban liquid-applied waterproofing over cement board, extended 12 inches above shower enclosure, tile set with ANSI-A118.11 thin-set.' Avoid: 'Waterproof the shower with cement board and paint,' or 'Use waterproofing membrane per code.' The city will also ask you to identify who will install the system—a licensed plumber, a tile contractor, or the homeowner under supervision—because improper installation voids the waterproofing warranty.

The waterproofing must extend above the showerhead (typically 6-12 inches per product spec, often higher on the walls facing the spray) and under the pan or base to capture any water that penetrates the tile. If you're installing a frameless glass shower enclosure, the waterproofing scheme is even more critical because water can bypass the grout line more easily. Vernon Hills requires that you detail how water will drain from the pan back to the main drain and that the pan slope is a minimum 1/4 inch per foot toward the drain. If you hire a contractor, request that they submit the waterproofing detail to the city before work begins, not after; this avoids expensive rework if the inspector rejects the system during the rough inspection.

Exhaust fan ducting in Vernon Hills: attic routing, condensation, and inspections

A common rejection in Vernon Hills bathroom remodel permits is the exhaust fan duct termination detail. IRC M1505 requires that exhaust fans be vented to the outdoors—not into an attic, unconditioned crawlspace, or soffit without proper dampers and drainage. Vernon Hills climate zone 5A sees sub-zero winter temperatures, and condensation in exhaust ducts is inevitable; if that condensation pools and refreezes, it blocks airflow and can cause mold in walls and attics. The city's code interpretation requires that the exhaust duct slope downward at a minimum 1/4 inch per 10 feet toward the exhaust termination (or toward a condensation drain point), and if the duct runs more than 10 feet, you must install a condensation trap or drip line to capture moisture and route it back into the bathroom drain system or to an exterior drain.

When you plan your exhaust duct routing, identify the shortest path from the bathroom to the exterior and check whether routing through the attic, through an exterior wall, or through a soffit is feasible. Attic routing is common but requires that the duct maintain slope the entire length; soffit routing is often simpler but requires a soffit vent and damper. If you're running the duct 20+ feet through an attic (a typical scenario in a ranch home), you must install a condensation trap at the lowest point of the duct run; this is a T-fitting with a small-diameter drain line that routes back into the bathroom sink drain or to the exterior. The trap must be accessible for cleaning. Vernon Hills examiners will ask to see the duct path on your plan, the termination detail (photo or diagram of the vent cap), and the condensation-management strategy if the duct run is long.

Exhaust fan CFM (cubic feet per minute) sizing is also checked. IRC M1505 requires a minimum of 50 CFM for bathrooms up to 100 square feet, and 1 CFM per square foot for larger bathrooms, with a minimum of 50 CFM. A typical 75-square-foot bathroom needs a minimum 75 CFM fan. The city doesn't usually reject permits based on over-sizing (a 100 CFM fan in a small bath is fine), but under-sizing will be flagged. When you select your fan, verify that the duct diameter (usually 4 inches) is sized for the CFM; a 100 CFM fan with a 3-inch duct will lose efficiency and may create backpressure. The city's inspector will verify duct sizing and termination during the rough inspection, before drywall is installed, so coordinate with your contractor to have this ready for review.

City of Vernon Hills Building Department
Vernon Hills City Hall, 435 Olsen Avenue, Vernon Hills, IL 60061
Phone: (847) 970-6677 or (847) 970-6600 main line — ask for Building Department | https://www.vernelhills.com (navigate to Permits or Building & Zoning; online permit portal available)
Monday–Friday 8:00 AM – 5:00 PM (closed weekends and city holidays)

Common questions

Do I need a permit if I'm just replacing old tile with new tile in my shower?

No, if the tile replacement is purely cosmetic and you're not removing or relocating the shower pan, valve, or drain. If the replacement requires removing the old waterproofing layer or adjusting the pan slope, then a permit is required because you're modifying the waterproofing assembly. Verify with the Building Department if you're unsure whether your scope crosses into structural/waterproofing work.

Can I do bathroom electrical work myself, or do I need to hire a licensed electrician?

Illinois state law requires that all electrical work be performed by a licensed electrician. As the permit holder (owner-occupant), you can pull the permit yourself, but you must hire a licensed Illinois electrician to perform the work and pull a separate electrical trade permit. This applies to all circuits, outlets, lighting, and exhaust fan wiring.

What happens if I move a toilet but don't call for inspection?

Vernon Hills Building Department will likely discover the unpermitted work during a property inspection (e.g., if you refinance, sell, or a neighbor reports it). At that point, the city will issue a violation notice, you'll owe back permit fees (double the original fee), and you'll be required to have the work inspected and brought to code compliance. If the drain line was improperly sloped or the trap-arm length exceeds code, you may need to reroute the drain entirely, which is costly.

How long does the plan-review process typically take for a bathroom remodel in Vernon Hills?

A complete bathroom remodel permit submitted with all required plans (floor plan, electrical diagram, waterproofing detail, exhaust duct termination) typically takes 2–3 weeks for plan review. If the submission is incomplete, the city issues a request for additional information (RAI), and you have 10 business days to respond; a resubmittal then takes another 1–2 weeks. Total timeline from application to permit issuance: 3–5 weeks for a complete, uncontested submission.

Can I install a shower without a barrier-free (ADA) curb, or is that required?

Unless your bathroom is in a public facility or you are required by local zoning to provide accessible features, there is no code mandate in Vernon Hills for a curb-free or zero-threshold shower in a residential bathroom. However, if you choose to install a zero-threshold pan, you must ensure proper waterproofing and slope; these pans are more prone to water escape if not installed correctly. The city's inspector will verify waterproofing and slope compliance regardless of pan type.

What is the difference between a GFCI outlet and an AFCI outlet, and which does my bathroom need?

A GFCI (ground-fault circuit interrupter) detects electrical leakage and cuts power to prevent electrocution; all bathroom outlets require GFCI protection per code. An AFCI (arc-fault circuit interrupter) detects dangerous arcing and is typically required on bedroom circuits and some kitchen circuits but not specifically for bathroom outlets. However, if your bathroom is served by a bedroom circuit, the code may require AFCI protection on that circuit. Vernon Hills examiners will specify GFCI vs. AFCI requirements based on the circuit routing; always clarify this with the city or your electrician when planning electrical work.

My bathroom drain is very far from the existing vent stack. Do I need to add a new vent stack?

If the drain trap-arm length exceeds code maximums (typically 3 feet for a toilet, 5–6 feet for a sink, 8 feet for a shower), the code requires either a loop vent or a new vent stack to prevent siphoning and drainage problems. The Building Department will review your plumbing plan and specify vent requirements. Adding a new vent stack is expensive (often $2,000–$5,000) but may be necessary; discuss this with your plumber early in the planning phase to avoid surprises.

What permits are required if I'm adding a new full bathroom to my home (not remodeling an existing one)?

Adding a new bathroom follows different code requirements than remodeling an existing bathroom. In Vernon Hills, a new-bathroom addition requires permits for structural framing, plumbing rough-in and final, electrical, HVAC (if ductwork is modified), and a final inspection. The permit fee and timeline are typically higher because the city must review egress, structural loads, and plumbing/electrical integration into the home's existing systems. Contact the Building Department for specific requirements for your project.

If my home was built before 1978, do I need to disclose lead paint before remodeling the bathroom?

Yes. Federal law (RRP Rule, 40 CFR Part 745) requires that before renovating any painted surface in a pre-1978 home, you must provide the homeowner (and any tenants) a pamphlet on lead hazards. Lead-paint disclosure is separate from the building permit, but it's a legal requirement. If you hire a contractor, they must verify that you are aware of potential lead hazards. This applies even if the bathroom renovation does not disturb paint—it's an informational requirement.

Can I start work before my permit is approved, as long as I pull the permit first?

No. Work must not begin until the permit is issued by the City of Vernon Hills Building Department. Starting work before permit issuance is a violation and can result in stop-work orders and fines ($100–$300 per day). Once your permit is issued, work can begin. If you are under a time constraint (e.g., kitchen remodel, occupied home), request expedited plan review (typically +25–50% fee) to shorten the 2–3 week timeline.

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 Vernon Hills Building Department before starting your project.

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