Do I need a permit for a full bathroom remodel in
St. John, Indiana?

St. John full bathroom remodel permits — the key details

The Indiana Energy Conservation Code (2015 IBC/IRC) requires a building permit for any bathroom project that involves plumbing fixture relocation, electrical circuit additions, exhaust-fan installation, or structural changes. St. John Building Department interprets this as: if your project requires a licensed plumber, electrician, or HVAC contractor to pull a trade license for the work, a building permit is mandatory. The city does not use a dollar-threshold exemption for bathrooms (unlike some Indiana towns that exempt projects under $5,000), so scope is the governing factor. Per IRC M1505.1, any bathroom must have mechanical ventilation capable of removing moisture; if you're adding a new exhaust fan or enlarging the duct termination, that's a permit trigger. Similarly, IRC E3902 requires GFCI protection on all bathroom receptacles and AFCI on all branch circuits serving the bathroom — if your electrical panel needs new breakers or circuits to meet this requirement, a permit is due. The most common omission homeowners make is assuming a vanity swap doesn't need a permit; that's correct only if the vanity is in the exact same location and the supply/drain lines aren't touched. If you're relocating the vanity by even a few feet, the plumbing tie-in becomes a permitted item.

St. John's building permit process is entirely in-person and paper-based; there is no online portal to submit plans. You must visit City Hall (contact the Building Department at the main city line to confirm current hours and address), bring two sets of printed plans showing the bathroom layout (existing and proposed), fixture locations, plumbing and electrical changes, and exhaust-duct routing. The city does not require stamped architect or engineer drawings for a standard bathroom remodel — owner-builder plans are acceptable if they're clear and to scale. The intake clerk will assign your permit to a plan reviewer, who typically takes 3–5 business days to mark up the plans (or issue approval) and call you back. Common rejection reasons: shower waterproofing is shown but the system (cement board + membrane brand, or prefab pan, or kerdi-style) is not specified; exhaust-fan duct is shown running into the attic or soffit without terminating to the exterior; bathroom electrical plan does not clearly mark GFCI/AFCI locations; trap-arm length on a relocated toilet drain exceeds the maximum run without a vent (IRC P3005.1 allows a maximum horizontal distance of 6 feet from trap to vent, minus 2 inches per foot of drop — violation of this rule is the single most common rough-plumbing rejection in St. John). Once approved, your permit is valid for 180 days. You must call for rough plumbing inspection before any drywall goes up; the inspector will verify trap pitch, vent routing, GFCI/AFCI rough-in, and exhaust-fan duct isolation from attic (duct must be sealed, not left open to unconditioned space per IRC M1505.2.3). Drywall inspection is optional if walls are not moved; if they are, you'll need a framing inspection first. Final inspection occurs after trim, paint, and all fixtures are installed.

Waterproofing is non-negotiable in St. John inspections, especially for tub-to-shower conversions. IRC R702.4.2 requires that all surfaces in a tub or shower enclosure be covered with a water-resistant material; the code specifically requires either a vapor-permeable membrane under tile (cement board + waterproof membrane such as Kerdi, RedGard, or equivalent) or a prefabricated waterproof pan system. Many DIYers install tile directly over drywall or greenboard, thinking the paint will suffice — it won't pass inspection. The inspector will physically tap the substrate with a coin to check for hollow or soft spots indicating improper prep. Cement board is mandatory under tile; it must be installed per manufacturer specs (typically 1/4-inch fastened every 8 inches, with alkali-resistant fiberglass mesh tape and polymer-modified thinset mortar). If you're converting a bathtub to a shower, the old tub-surround drywall must be completely removed and replaced with cement board and membrane. The membrane must extend at least 6 inches beyond the shower threshold and wrap all corners; any seams in the membrane must be lapped and sealed with waterproof tape. The inspector will require photographic evidence of waterproofing before drywall closure — you cannot skip this step or hide it behind drywall. Cost for waterproofing materials and labor is typically $800–$2,000 depending on shower size and tile complexity.

Plumbing and electrical coordination is critical in St. John inspections because the rough plumbing and rough electrical inspections happen back-to-back, and the inspector will verify that fixture locations match the approved plan. If your electrical rough-in shows an outlet in a location that conflicts with the plumbing (e.g., outlet within 6 inches of a sink drain), the inspector will reject both and require re-work. IRC E3902.1 specifies that all receptacles within 6 feet of the sink must be GFCI-protected; if your vanity sink is longer than typical (72 inches or more), you may need multiple GFCI outlets or a GFCI-protected branch. Additionally, any bathroom exhaust fan must be on a separate 20-amp circuit per NEC Article 210; if your home's panel is full, you'll need a sub-panel or circuit consolidation (a significant expense, $500–$1,500). The exhaust-fan duct must terminate to the exterior, never into the attic, soffit, or crawl space; duct routing must be the shortest path possible (max 25 feet per most fan manufacturers), with no horizontal runs longer than 8 feet without a vent — the inspector will verify duct diameter matches the fan (typically 4-inch or 6-inch) and that the exterior termination has a damper or back-draft flapper. Improper duct routing is the second-most common rough-electrical rejection in St. John bathrooms.

Lead-paint compliance is mandatory for homes built before 1978 in St. John, per federal EPA RRP (Renovation, Repair, and Painting) Rule. When you pull a bathroom permit, the city will ask: is the home pre-1978? If yes, the contractor must be RRP-certified, and the work area must be contained to prevent lead dust from migrating to other rooms. This applies even if you're only removing drywall or tile; it is not optional. If you hire an unlicensed contractor or skip containment, the EPA can issue a civil fine of up to $43,792 per violation. The permit application includes a lead-hazard disclosure form; you must sign it acknowledging the requirement. Many homeowners assume this rule doesn't apply if the bathroom paint isn't chipping or visibly deteriorated — incorrect. The rule applies to any work that disturbs pre-1978 paint, whether or not it's in bad condition. Cost for RRP-certified contractors is typically 10–20% higher than non-certified work due to containment and training.

Three St. John bathroom remodel (full) scenarios

Waterproofing and substrate requirements in St. John bathroom showers

IRC R702.4.2 mandates water-resistant surfaces in shower enclosures, and St. John inspectors enforce this strictly because climate zone 5A's humidity and temperature swings create conditions for mold and rot. The code requires either a vapor-permeable membrane system under tile (cement board with reinforced waterproof coating) or a prefabricated shower pan. Cement board is the traditional choice; it is not regular drywall, and it is not waterproof by itself. Waterproof membranes (such as Kerdi, RedGard, Aqua Defense, or equivalent) are the required second layer. Many homeowners mistakenly install tile directly over greenboard or painted drywall, believing the paint is sufficient; this will fail inspection and will eventually lead to rot behind the tile.

Installation details matter enormously. The cement board must be fastened with corrosion-resistant screws (stainless steel or coated), spaced no more than 8 inches apart, and installed over a vapor-retarder if the wall cavity has insulation. The waterproof membrane then goes over the cement board using a polymer-modified thinset mortar (not standard thinset); the membrane must be lapped at all joints and seams with waterproof tape, and it must extend at least 6 inches beyond the shower threshold on the bathroom floor. The curb or threshold of the shower must have a proper slope (1/4 inch per foot) to direct water back into the shower enclosure, not out into the bathroom. Any recesses in the shower wall (shelves, niches for soap) require special waterproofing — do not cut a cavity into cement board and tile without installing a waterproof backing; the inspector will reject it.

St. John's building inspector will request photographic evidence of waterproofing before drywall closure. This means you must take clear photos of the cement board, membrane, and tape application and submit them with your drywall closure request. If the inspector visits and cannot see evidence of proper waterproofing (because drywall is already installed), the entire enclosure may need to be opened and redone, a costly and time-consuming failure. The cost of materials for a proper waterproofing system (cement board, membrane, tape, thinset) is $300–$600 for a typical 48x36 shower; labor for installation is $600–$1,200. This is not an area to cut corners or DIY without experience.

Plumbing drain routing and frost-line compliance in St. John's climate zone 5A

St. John's frost line is 36 inches, meaning the ground freezes to that depth in winter. Any underground plumbing (soil lines, drains, water mains) must be buried below the frost line to prevent freeze-thaw damage and soil heave. For a bathroom remodel involving toilet relocation or new drain runs, this is critical: if your home is on a concrete slab, you may have no frost-line concerns (the slab sits on fill, not on soil subject to freezing), but if it's on a crawl space or basement with soil drainage, the inspector will verify that the soil line exits the foundation below 36 inches. IRC P3005.1 governs drain pitch and trap-to-vent distance; the horizontal distance from a trap to the nearest vent cannot exceed 6 feet (minus 2 inches per foot of drop), meaning a toilet 6 feet from a vent must be pitched down 12 inches by the time it reaches the vent. This sounds simple but is frequently violated; the inspector will use a level or transit to verify the pitch is exactly 1/4 inch per foot, no more and no less.

If you're moving a toilet drain through an external wall (common in older homes when relocating the toilet to an exterior-facing wall), the new soil line must be sloped continuously and buried or insulated to prevent freezing. Some contractors attempt to route the line through an uninsulated external wall cavity — this will fail inspection and will crack in the first hard winter. The proper method is to route the line inside the building envelope (through interior walls and the crawl space or basement) and drop it below frost line before exiting to the septic system or municipal sewer. If this is not possible due to house layout, the line must be wrapped with heat tape and insulated foam, which adds cost and complexity.

The slope requirement is also stringent: you cannot slope a drain line too much. If the line slopes more than 45 degrees, solids will separate from liquids and accumulate (a condition called 'siphoning'), which clogs the line. The ideal slope is exactly 1/4 inch per foot, and the inspector will check this with a level, not estimate it by eye. If your plan shows a toilet drain that pitches too steeply (say, 1 inch per foot), the plan reviewer will reject it and require a revised routing. This is why proper planning matters: you cannot move a toilet wherever you like; the location must work with the building's drainage system and frost-line depth. In a ranch home on a concrete slab, the flexibility is greatest. In a 2-story colonial on a crawl space with clay soil, the constraints are tighter.

Common questions