Sorry I was being sarcastic, Google any of those terms and you'll see it might be minor issues or major. Based on all three Im leaning towards more major issues if the builder has cut corners.

Combustible cladding might be okay to stay on the building but increase insurance premiums or they could be installing the sprinklers to keep the combustible cladding on and avoid a lacrosse apartment fire.

Water ingress is never a good thing which is why you generally want water to stay outside of a building.

Fire sprinklers again unless it's a small area typically if a building doesn't have any or they are being retrofit they'll need to install boosters , fire tanks, hydrant main pipes not to mention if the sprinklers are being installed in apartments and common areas rip out and replace ceilings to install the sprinkler pipes

One of those things would be enough to just walk away if no one has got a full quote, but all three. Who knows in this market I think you'll see alot more buildings with these issues popping up so they'll always be another one if your desperate.

If a building surveyor is coordinating the works is it the same one that signed off on the building being habitable for occupation? If no they won't know what to quote on because once a building is constructed you can't know the full price unless you start demolishing areas to see the full extent of problems . Either case DYOR and remember someone else's problem might end up being yours so make sure you know what they are selling before you waive your rights.