Why it matters
The vanity dates a bathroom faster than anything except the tile. It is also the one thing in the room you can change without touching the waterproofing, which is why it sits at the very bottom of the bathroom cost ladder: a vanity swap is a plumber for an afternoon, not a renovation. There is a clock here too, and it is a good one to know. That integrated cultured-marble top, the moulded one-piece bowl-and-counter in cream or beige that is in every 1980s and 1990s Canadian bathroom, has a life of about 20 years per InterNACHI. The cabinet under it lasts 50+. So in a 1995 bathroom, the top is well past its life and the box beneath it very often is not, which is the same box-versus-doors logic that governs kitchens.
How to spot it
Value tells: an integrated cultured-marble top with a moulded bowl, a builder oak or white melamine box, a strip of bulb lighting above, a frameless builder mirror glued to the wall. Mid tells: a quartz top with an undermount basin, a shaker or slab door, a framed mirror, a proper light fixture. Premium tells: a double vanity, a stone top with a full backsplash, drawer banks, wall-mounted or floating cabinetry, and a custom millwork vanity in a genuinely high-end home.
What it costs
We are not going to publish a Canadian dollar range here, because the honest answer is that a vanity is a retail product whose price is whatever you choose to spend, from a few hundred dollars at a big-box store to five figures in millwork. What we can tell you is the order: a vanity swap is the cheapest real change in a bathroom, and it costs a small fraction of the refresh tiers on the bathroom card.
What to do
Monitor. If the layout and tile are acceptable and only the vanity is dated, you are looking at a very small number, not a renovation. Price it that way in your offer.
Education and triage, not a home inspection. Casaroo names the vanity tier it can see. What the plumbing behind it looks like is a question for the tour, and for the inspection.