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Our, hopeful, purchase has half of the ground floor extended for a kitchen, so I let the surveyor know that we might want to extend the rest of the ground floor for a bigger kitchen/diner and maybe a shower room/wc/utility room. Speaking of which, I think @Brommers, you mentioned something in the difference between needing to seek planning permission and permitted development. Does it sound like this might apply here?
It might do. Although from the photograph it looks as though as well as the rear extension there's also been a loft conversion. You can extend your property by a certain percentage under PD rights, beyond that you need PP. You might still have some space left within PD rights - it'd depend on the GIA before the extensions and after. As Prole. says, if it's listed then PD rights don't apply, but I think it was Nelly's prospective purchase that's listed.
It's a real minefield of regulations, and I'm far from an expert on these things. If it's a deal breaker rather than just a 'it'd be nice, but' thing then I'd recommend getting specialist advice on whether you'd need PP and, if so, whether you'd get it.
Most (at least the surveyors I looked at) recommended you let them know what you have in mind so they can factor that in while surveying. How much use they'll be, I don't know.
Our, hopeful, purchase has half of the ground floor extended for a kitchen, so I let the surveyor know that we might want to extend the rest of the ground floor for a bigger kitchen/diner and maybe a shower room/wc/utility room. Speaking of which, I think @Brommers, you mentioned something in the difference between needing to seek planning permission and permitted development. Does it sound like this might apply here?