A small amphibious ship comes in at about 200m in length. If you remember the French
Mistral-class that was in harbour a couple of years ago, that would be a good example. The French where shopping the design around for buyers. There are two under construction in France for Russia right now, but those may get tied up if the political situation escalates any further, so possibly a cheap buy for us, if we wanted them. Otherwise, I'm sure they'd be quite happy to do a technology transfer (they already sold the plans to the Russians who will be building more after the two French ones arrive).
Australia is currently building
two LHDs in the 230m range based on a Spanish design.
By comparison, a large frigate or destroyer, the classes the new surface combatant built in Halifax is expected to replace, would be about 125-150m.
The new replenishment ships being built in BC will be about 177m (Based on the German
Berlin class).
Not actually sure what the new Irving facilities are being built to handle.
The drydock is 257m, and the new production facility is 47m, so I think that would be big enough, but not entirely sure.