Madison Bath Works publishes this planning resource for Madison and Dane County homeowners. The direct answer is: A true curbless shower costs more than a standard shower when the floor must be recessed, joists evaluated, drainage relocated or a larger area waterproofed. The finished threshold is only the visible result. Structure, slope, drain choice, waterproofing and splash control determine whether the design works.
Where the extra work occurs
The shower floor needs sufficient fall to the drain without creating an abrupt step outside the shower. Achieving that may require a recessed subfloor, a manufactured sloped base, framing review or a different drain. The method must be chosen before demolition and finish elevations are finalized.
Waterproofing beyond the shower
Open entries allow more water movement than a fully enclosed shower. The waterproofed area, door or panel position, showerhead direction and bathroom floor transitions should be designed together. A long linear drain does not correct inadequate slope or splash control by itself.
Accessibility details
Zero threshold is one element. Clear approach, door width, turning space, controls, handheld shower, seating, support blocking and surface traction must suit the person using the room. Generic accessibility labels are not a substitute for individual requirements.
Cost planning
Use the accessible-remodel planning band rather than pricing only the drain. Structural work, larger-format waterproofing, custom glass and tile labor are common cost drivers. A site visit is needed to determine whether the existing floor can support the intended assembly.
Questions for the provider
Ask for a section drawing or clear explanation of floor elevations, slope, drain connection and waterproofed boundaries. Confirm how the assembly will be tested, which inspections apply and what happens if framing cannot be altered as expected.
Frequently asked questions
Is low-threshold the same as curbless?
No. A low threshold reduces the step but still has a raised transition. A curbless shower has a continuous entry plane.
Does a linear drain make any shower curbless?
No. The floor structure, slope and waterproofing still have to accommodate the design.
Can this be done in an older home?
Often, but framing and floor elevations must be evaluated. Some rooms require a different approach or a low threshold instead.
