Start by deciding between a roll-in (zero-threshold) shower and a low-curb design. A roll-in shower removes the step entirely, which matters if your parent uses a wheelchair, walker, or is planning ahead for less steady footing. It usually means adjusting the floor and drainage, so it's a bigger job. A low-curb shower keeps a small lip that's easier to install in an existing bathroom and still far safer than a standard tub. In our experience, if you own the home and want a lasting solution, spend the extra for a roll-in. The trade-off is more disruption and cost up front, but you won't be redoing the bathroom in a few years.
Edmonton's housing shapes the work. Older homes in Ritchie, Bonnie Doon, and the Highlands often have tight bathrooms and older plumbing, so ask installers how they'll handle re-routing drains and reinforcing walls for grab bars. Condos in Windermere, downtown, or the west end may have concrete floors and strata rules, so confirm any building approvals early. Whatever the layout, prioritize built-in seating, properly anchored grab bars, and a hand-held sprayer with anti-scald controls. Those three features do the most for safety.
When you compare installers, look for real experience with seniors and accessibility work, not just general renovation. Confirm they're licensed and insured in Alberta, ask what warranty covers both the fixtures and the labour, and check how fast they respond if something leaks or fails. Given our winters, ask when they can start and whether they can do the tear-out and rebuild in one stretch so your parent isn't without a shower for long. Our advice: choose the installer who asks about your parent's mobility and daily routine before quoting, even if they aren't the cheapest. The trade-off is you may wait a little longer for a busy, careful crew, but the fit will be right.