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If it's a "conservatory" it needs to be on a separate heating "loop" or whatever - and have doors to isolate it from the main house - this is to circumvent the heat/energy loss requirements of the building regs - but it needs to meet the building regs for glazing Uvalues and electrics.
If it's an "extension" with a glass roof and doors you need sap calcs to confirm the heat loss is within the regs and you need to meet all other building regs.
The size and scale of it probably is within permitted development rights tho
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@Sheppz ah okay makes sense. So the would be doors (original double doors out to the garden) aren't currently installed but could be easily put back in. So you'd need planning and to comply with building regs to do it properly and fully open the space?
@Howard they're sending over a full building survey from when the neighbour had their extension so will check that, and if successful in my offer my full survey / solicitors would hopefully pick up on that? 2 up 2 down so yeah I imagine thin kitchen and the rest of it would have been a dining room.