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Yep.
Suspect that if someone has converted a garage to a kitchen and didn't replace / deal with the openings they probably haven't gone through BC. Y0u'd just need to take a view on the problems this could cause you. Mostly around the likelihood of it all being one massive bodge.
But if it's you looking to convert then you'd need to notify and probably give them some plans and show that you are going to meet regs when its converted to a habitable space.
Probably not, but it probably would require BC notification and approval.