I didn't say they did.
But if your plan to make a house more accessible is predicated on fitting a stairlift, then be prepared for such plans to turn to shit if the person (s) involved then can't transfer to use a stairlift. Which is exactly what happened to a couple of people SWMBO knows through support groups.
In the OPs case, rather than fitting a stairlift *and* accessible bathroom, there may be more sense in working on a downstairs solution from the get-go ?????