Planning Permission

[vernonk]

How big does something have to be to require planning permission on a residential property?

[Buenchico]

It's not simply size that matters. Location can be just as important. (e.g. the proximity of the new structure to any existing buildings or to property boundaries).

Start here:
http://www.planningportal.gov.uk/permission/

[The Builder]

Check out Chris's Planning Portal site......... looking for "permitted development". That's a summary of what's allowed without having to apply for PP.
Have a look at the "Interactive House" link.

[sddsddean]

Different authorities have different rules. For instance, we needed planning for our conservatory, but if our garage had been connected to the house (even just by a brick arch over the back gate between the two) , we wouldn't. Ring up your planning office and ask their advice...and if you ask they will be more helpful in the long run.