Compare the installation packages
A curbless proposal must explain floor levels, slope and water containment across the transition. A low-threshold proposal should specify the actual finished step and base connection. Keep the comparison tied to the complete floor assembly, including restoration beyond the shower.
Normalize the proposals
Use the same dimensions, fixtures and enclosure features for both options, then isolate the work that differs. Mark demolition, substrate preparation, connections and finish restoration as included or excluded. Ask each contractor to identify the condition that would change the recommended assembly. This exposes a real scope difference instead of treating two product labels as a complete comparison. Where either option requires specialist fabrication, identify who measures and approves those components before ordering.
Where can the scope difference arise?
Recessing or rebuilding the floor, moving drainage and extending waterproofing may distinguish curbless work from a raised base. The contractor needs to assess the existing structure before confirming which changes are necessary.
The owner should confirm the proposed service scope and provider availability independently. This guidance does not identify an approved contractor, establish coverage for a specific property or guarantee acceptance of the project.