What do I need to know? What can I expect the vendor / estate agent to tell me?
I have seen a flat I adore and it has a "playroom" and master bathroom in the attic and specifies no planning permission for the conversion.
When I go to view it, what do I need to know? Assuming planning permission and building regs are different things. Is it the building regs that will show that the work is up to standard?
Is it suitable for me to ask why they didnt seek planning permission?