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Wow, that's quite lax! I certainly wouldn't in general be advising that knuckle-sized (15+mm) cracks in a masonry house are "fine"
Burland et al classifications are widely accepted as the go-to damage categories. 15mm+ is severe...
Every situation is different though and individual inspection is key to determine the cause rather than just the damage.
leggy_blonde
@Sam_w
Our house had much larger cracks than that, and we didn't have to underpin, just helicoiled and made good, all planned and signed off by a structural engineer. He told us the rough rule of thumb, if you can fit a hand in, then its fine, put an arm in you helicoil, put a body in then you need more drastic measures.