Do I need a permit for a full bathroom remodel in
Florissant, Missouri?

Florissant bathroom remodel permits — the key details

The City of Florissant Building Department administers bathroom permits under the 2021 IBC, with particular attention to IRC P2706 (drainage and waste pipe sizing and slope) and IRC E3902 (ground-fault circuit interrupter requirements for all bathroom receptacles). Any full remodel that involves moving a toilet, sink, or shower—or converting a tub to a shower—requires a plumbing permit. The most common trigger for a comment-round rejection is incomplete shower waterproofing specification: Florissant inspectors want to see your cement-board-and-liquid-membrane assembly clearly noted on your drawings, or they will ask you to resubmit with a manufacturer's spec sheet (such as Schlüter KERDI or Curbless Tile systems). Exhaust fans are governed by IRC M1505, which requires a minimum of 50 cubic feet per minute (CFM) intermittently during operation or 20 CFM continuously; most inspectors verify that your duct is rigid or semi-rigid, slopes downward toward the exterior termination, and does not exceed a 25-foot run. If you're adding new electrical circuits—even a dedicated 20-amp circuit for a heated floor mat—you trigger an electrical permit, which is filed separately but reviewed at the same time as your plumbing plan.

Florissant's specific entry point is the City of Florissant Building Department, located within Florissant City Hall. You'll submit a single permit application with all disciplines (plumbing, electrical, structural if applicable) and pay one consolidated permit fee, typically $200–$400 for a mid-range full bathroom remodel (estimated project value $8,000–$15,000), plus an additional $75–$150 if you're adding or relocating the exhaust fan. The city does NOT offer online permit filing for plumbing or electrical work—you must submit paper drawings and the application in person or by mail. Plan-review turnaround is 2–4 weeks; if the inspector has comments, you'll be notified and given 10 business days to resubmit. Inspections are typically performed in this sequence: rough plumbing (before walls are closed), rough electrical (before drywall), framing/structural (if walls are moved), and final (after tile, fixtures, and paint). The Building Department schedules inspections within 2–3 business days of a phone call or online request; inspection fees are included in the permit cost.

A critical detail specific to Florissant's enforcement practice: the city's inspector will walk through the finish work before signing off, checking for GFCI/AFCI compliance on the final inspection. This means if your electrician installed a standard outlet instead of GFCI-protected receptacles, or if you've swapped the vanity light without confirming AFCI arc-fault protection on the circuit, the inspector will catch it and you'll be asked to correct it before a certificate of occupancy is issued. Additionally, if your home was built before 1978, Florissant requires a lead-paint disclosure before any demolition or surface disturbance; if lead is suspected, you may be required to use a certified lead abatement contractor for removal of painted surfaces (cost impact $500–$2,000 depending on the scope). This is separate from the building permit but administered by the same department.

Florissant does allow owner-builders to pull plumbing and electrical permits for owner-occupied homes without a license, but you must be prepared to answer code questions during plan review and to be present for all inspections. A majority of Florissant homeowners hire a licensed plumber and electrician; if you choose the DIY route, bring your IRC code book to the Building Department when you submit, or have a plumber review your plans pro-bono before filing. The 30-inch frost depth in Florissant doesn't directly affect interior bathroom plumbing, but it does matter if you're installing a new main vent stack that must extend above the roof line—the inspector will verify that the stack is sealed at the roof penetration to prevent ice damming in winter.

Finally, Florissant has no active historic district overlay that would affect most bathrooms, and the city has not adopted any special requirement for universal design or ADA compliance in residential bathrooms (those are voluntary). If you're adding a new bathroom (rather than remodeling an existing one), the code path is identical, but you'll also need to verify that your home's septic or municipal sewer connection can accommodate the added fixture count—call the Public Works Department to confirm sewer service availability before you design. The Building Department's current preferred method of contact is a phone call to the main number; their staff can provide a rough estimate of the permit cost and review timeline during that call, and they'll mail you an application packet or point you to a downloadable form.

Three Florissant bathroom remodel (full) scenarios

Waterproofing, GFCI, and the most common Florissant bathroom-permit rejections

The single most common reason Florissant's Building Department requests a resubmittal on bathroom permits is incomplete or unspecified shower waterproofing. IRC R702.4.2 mandates a continuous water-resistive barrier behind all shower walls; the code permits multiple assembly types (cement board + liquid membrane, prefab waterproof panels, tile backer boards with sealant), but the inspector needs to see which one you're using. If your plan simply says 'waterproof shower surround' without specifying the brand, product name, and installation method, the inspector will issue a comment asking for a manufacturer's technical data sheet or installation guide—this delays your approval by 1–2 weeks. Bring your shower product spec sheet to your initial plan-review meeting, or better yet, submit it with your permit application. The inspector will stamp it and attach it to your permit card, and no further questions will be asked.

GFCI (ground-fault circuit interrupter) protection is mandatory on all bathroom receptacles per IRC E3902.1, and Florissant inspectors verify this during the final inspection. Every outlet within 6 feet of a sink, tub, or shower must be GFCI-protected—either via a GFCI outlet itself or via a GFCI breaker on the circuit. If your electrician installed a standard outlet and relied on a GFCI breaker, the inspector will mark it as non-compliant unless the breaker is clearly labeled. Additionally, if you're adding a lighting circuit in the bathroom, it must be AFCI (arc-fault circuit interrupter) protected per current code; older homes may not have AFCI, but any new work triggers the requirement. A heated floor mat, heated mirror, or ventilation-fan circuit also requires AFCI.

The second-most-common rejection is missing or incorrect exhaust-fan duct specification. IRC M1505.4 requires the duct to be continuous, rigid or semi-rigid (no flex ducting visible in the attic), minimum 4 inches in diameter, sloped downward toward the termination, and vented to the exterior (not into the attic, soffit, or crawlspace). If your plan doesn't show the duct routing or termination clearly, the inspector will ask for a detail drawing. Many homeowners overlook the requirement that the duct must slope at least 1/4 inch per foot; if you have a horizontal run of 20 feet, the outlet end must be 5 inches lower than the inlet—this sometimes requires routing the duct through the attic or soffit in a way that conflicts with insulation or framing. Plan ahead and sketch the duct path before you submit; a structural engineer or HVAC contractor can help confirm it's feasible.

Finally, trap-arm length on relocated drains is a frequent point of inspector feedback. IRC P3201.7 limits the distance from the trap weir to the vent stack to 6 feet (measured horizontally); if your new toilet or sink drain is more than 6 feet away from the nearest vent, you'll need a new vent branch or a separate wet vent. This is a code violation that can't be 'waived,' and the inspector will catch it during rough-plumbing inspection. If you're relocating any fixture more than a few feet, involve a licensed plumber in the design phase to size and route the drain and vent correctly.

Lead paint, owner-builder liability, and Florissant's actual inspection timeline

If your home was built before 1978, Florissant requires a lead-paint disclosure before you disturb any painted surfaces. If a bathroom built in 1975 has original painted trim or walls, you must provide the homeowner (or buyer if selling) with an EPA lead-hazard pamphlet and a signed disclosure form. If testing reveals lead-based paint, you may be required to use a certified lead abatement contractor for the removal of painted surfaces—or at minimum, you must follow EPA RRP (Renovation, Repair, and Painting) rules, which include containment, wet-cleaning, and specialized waste disposal (cost impact $500–$2,000). This is separate from the building permit but enforced by the same department. Ask the Building Department during your initial phone call if your address is in a designated lead-risk zone; most 1960s–1970s homes in Florissant are flagged.

Owner-builders are allowed to pull permits for owner-occupied homes in Florissant without a license, but the city does not provide hand-holding. The Building Department staff will review your plan and flag code violations as though you were a licensed contractor. If the inspector has doubts about your ability to execute the work safely—for example, if your plumbing plan violates trap-arm length rules, or if your electrical plan shows a wrong wire gauge—they will request corrections before permit issuance, or they may require a licensed plumber or electrician to co-sign the permit. In practice, most owner-builders in Florissant hire the trades and pull the permit themselves, which splits the cost and responsibility. If you're DIY-ing the plumbing, invest in IRC P2703–P2906 study beforehand (or buy the IRC Plumbing Chapters separately) and be prepared to discuss drain sizing, trap venting, and manifold design with the inspector.

Florissant's actual inspection turnaround is 2–5 business days if you call in the morning and the inspector's schedule is clear. However, plan-review turnaround is currently 2–4 weeks; the city does not publish an SLA (service-level agreement), but phone calls to the Building Department confirm this is typical. If your plan has comments, you'll be asked to resubmit within 10 business days. Once your permit is approved and you've paid the fee, you can call to schedule rough inspections; the inspector will typically visit within 48–72 hours if you're flexible on timing. Final inspection is scheduled after you've notified the city that the work is complete; the inspector will walk through, verify GFCI and AFCI compliance, check the ductwork termination, and confirm that all work matches the approved plan. If defects are found, the inspector will issue a 'corrections list' and give you 10 business days to fix them and request a re-inspection.

Common questions