Central Vancouver Island has one of the oldest population profiles in the country, and the corridor from Nanaimo through Parksville to Qualicum Beach more so than most. The result is a lot of households doing the same arithmetic: a house they want to stay in, and a bathroom that is the reason they might not be able to. It is usually the bathroom. It is almost always the tub.
What actually makes a bathroom unusable. Stepping over a 500mm tub wall onto a wet surface while holding a towel rail never designed to take weight. A door 660mm wide that a walker will not pass. A toilet at 380mm that is hard to rise from. A valve you have to reach through the spray to turn on. Nothing on the wall that will actually hold. None of these require a major intervention alone — but they compound, and the point at which they compound is usually the point at which the room needs rethinking anyway.
Clearances are the whole design. A wheelchair needs a turning circle of around 1,500mm, or a T-shaped turning space where a full circle will not fit. Clear floor space at the toilet allows a transfer from the side, which requires the space beside the pan to be genuinely clear rather than occupied by a vanity return. A door needs a clear opening of at least 810mm to pass a wheelchair comfortably, and swing-clear hinges add another 40 to 50mm; a door that swings outward, or a pocket door, removes the problem of a fallen person blocking a door that opens inward — the most overlooked safety detail in a bathroom. A wall-hung basin with knee clearance beneath, and a wall-hung toilet, both free floor area a pedestal or full-depth vanity occupies. These numbers are the design.
The curbless shower is the centrepiece, and it is a structural decision. A barrier-free entry needs the shower floor to sit below the surrounding finished floor so water runs the right way without a curb. On a timber floor that means recessing the structure — notching or sistering joists, or building the rest of the bathroom floor up to meet the shower. Over a concrete slab, recessing is usually unavailable and the answer is a linear drain at the far wall with a very low threshold and a generous slope. Beyond the entry, water control substitutes for the curb: a longer wet zone, a fixed glass panel placed to catch spray rather than a door, floor tile small enough that its grout joints give grip, and the head positioned away from the entry. Getting this right is what separates a curbless shower from a bathroom with a wet floor.
Seats, rails and the handheld. A folding wall-mounted seat needs blocking capable of carrying a person plus dynamic load, set during framing at the manufacturer's fixing heights. A built-in bench is framed and waterproofed like a curb, solid throughout, and located so the controls and the handheld are reachable from it — the detail most often missed. Grab bars need continuous blocking rather than a single stud, because the useful position rarely coincides with a stud and because a bar loaded in a fall sees far more than body weight. The horizontal bar at the shower entry, the vertical bar for pulling up, and the bar beside the toilet each do a different job. A handheld shower on a sliding rail is the most useful fitting in the room: it serves someone seated, someone standing, someone assisting, and it makes the shower cleanable.
Blocking now, hardware later. The most sensible thing a household in their sixties can do during a renovation is install continuous blocking in the shower walls, beside the toilet and along the entry wall, and then hang nothing on it. It adds little to the framing cost and it means grab bars can go in at any point in the future, in exactly the right position, without opening tile. It is worth asking for even when accessibility is not the reason for the project.
It does not have to look institutional. This is the objection that stops most people, and it is out of date. Grab bars are now made as towel rails and as finished hardware in the same brass, black and brushed nickel as the rest of the room. A folding teak seat reads as a bench, a curbless shower reads as contemporary rather than medical, and a comfort-height toilet is simply a toilet. The features that make a bathroom work for someone with limited mobility are, almost without exception, features that make it better for everybody — which is the argument for doing them during the renovation rather than after an event.