Modifications
Roll-In Shower Conversion: Complete Guide
Updated June 2025 — Permits, process, and costs
What Makes a Shower Roll-In Accessible
A roll-in shower eliminates the curb or threshold that standard showers require, allowing a wheelchair or shower chair to roll directly onto the shower floor. The key design elements are: a curbless (zero-threshold) entry, a floor sloped toward the drain (typically 1/4" per foot), adequate turning radius (minimum 60" diameter clear floor space), and grab bars at appropriate heights.
Conversion vs. New Construction
Most residential roll-in shower projects are conversions — transforming an existing tub/shower or shower stall. This almost always requires: removing the existing tub or shower unit, relocating the drain (significant plumbing work in most cases), waterproofing the subfloor and walls, retiling, and installing the new fixtures. This is not a DIY project for most homeowners — it requires a licensed plumber and a tile contractor at minimum.
Permit Requirements
Roll-in shower conversions require permits in the vast majority of jurisdictions:
- Plumbing permit: Required whenever drain location changes; required in virtually all states
- Building permit: Required when the shower conversion involves structural changes (common when removing a tub that sits in a framed alcove)
- Electrical permit: May be required if ventilation or GFCI wiring is updated as part of the project
The Conversion Process: Step by Step
- Assessment: Plumber assesses drain location and existing rough-in; determines whether drain can be re-used or must be relocated
- Permit application: Contractor submits permit application with scope of work; approval typically takes 1–3 weeks
- Demolition: Existing tub/shower unit removed; subfloor inspected for water damage
- Drain relocation (if needed): New drain installed in correct position for curbless floor slope; this is the most variable-cost element
- Subfloor and waterproofing: Subfloor repaired if needed; waterproof membrane applied to floor and walls
- Concrete slope pour or sloped liner: Floor built up to achieve correct slope toward drain
- Tile installation: Floor tile (small format, non-slip recommended); wall tile
- Fixtures: Valve, handheld showerhead, grab bars installed
- Inspection: Inspector verifies plumbing and construction before final closeout
Typical Costs
| Scenario | Cost Range |
|---|---|
| Basic tub-to-shower conversion (same drain location) | $2,500–$5,000 |
| Standard roll-in shower, drain relocation required | $5,000–$9,000 |
| Full accessible bathroom (roll-in + grab bars + widened door) | $9,000–$18,000 |
| Prefabricated accessible shower unit (faster install) | $3,500–$7,000 installed |
Funding
Roll-in shower conversions are covered by the VA HISA grant, Medicaid HCBS waivers in most states, and USDA 504 for eligible rural homeowners. Many Area Agency on Aging programs also fund bathroom modifications specifically.
Once the permit is approved and materials are ordered, the physical work typically takes 3–7 business days for a standard conversion. The permit approval process adds 1–3 weeks in most jurisdictions. Total timeline from contractor selection to completed project: typically 4–8 weeks. Custom tile work or complex drain relocation can extend this.
Yes. Several manufacturers make prefabricated accessible shower units designed specifically for residential accessibility conversions (American Standard, Kohler, and others). These use acrylic panels rather than tile, which reduces install time and cost. The tradeoff is aesthetic — tile looks more permanent and custom. From an accessibility standpoint, a properly installed prefab unit is fully equivalent to a tiled roll-in shower.