Why it matters
This is one of the very few premium signals in a house that is unambiguous from a photo. You cannot fake frameless glass and you cannot install it cheaply, because it needs thick tempered glass, precise tiling behind it (the walls have to actually be plumb, which cheap tiling is not), and custom fabrication. In Casaroo's verified exemplar set, frameless glass appears on the premium side of the line and framed sliders appear on the value side, consistently. It works as a ladder, and you can read it in seconds: - Curtain on a rod, fibreglass one-piece tub-and-surround: builder grade. The surround unit has a life of about 20 years and is almost always the original. - Framed sliding door, usually aluminium, usually on a tub: builder grade, and the frames trap water and mould at the track, which is where you should look. - Semi-frameless or a fixed glass panel: mid. - Full frameless glass, or a curbless walk-in with a single panel: premium.
How to spot it
Look for the metal. A thick metal frame on all four sides is the value tell. Thin or absent framing with visible chrome or black hardware only at the hinges is the premium one. Look at the track at the bottom of a slider: dark, stained, or crusted is where water and cleaner have been sitting for years.
What it costs
We could not find a defensible Canadian rate for shower glass, and we would rather say that than publish a number we cannot stand behind. Here is what is sourced and useful instead: shower doors last about 20 years and a one-piece shower enclosure about 50, so a 1990s builder slider is at or past its life and a replacement is a legitimate, small line item to raise.
What to do
Monitor. Treat glass as a tier signal rather than a cost. If you are already retiling the shower, the glass is a modest add-on and worth doing at the same time; on its own it is a small job.
Education and triage, not a home inspection. Casaroo names the enclosure tier it can see and tells you what clock it is on. It cannot tell you whether the shower behind it is leaking. That is what the tile, grout and caulk card, and an inspection, are for.