Im planning to have a single storey extension built to the side of my property, do i need to leave room of a path to the rear of the property ???

Hi, most councils would prefer it if you can leave a gap of 700 - 800mm or so to enable access to the garden. If you have access to the garden by some other means then you should be fine. It is always worth leave a 150mm gap or so at the boundary so that your gutters don't overhang next door's garden/

as Architecural services have said it is always best to leave a path between houses if you come to sell the property after it my put buyers off if they have to walk around the block to get in to the back

It's always best to keep at least 1 meter clear from buildings to boundary fence line, for any remedial works /maintenance work if later required. Kind regards Land Marks.co.

Definitely you need a gap in between the house and fence for any utility and access.

Depends on your local borough as this rule differs from borough to borough right across the country. Common sense would dictate that access is preferable; if however you are building a boundary wall at the back (as opposed to side) in a face brick that will never require maintenance or access, then of course the answer is no. A path up the side, to take you from front drive to rear garden, is always a good idea, if not strictly a legal requirement. When you are carrying turf and fence posts through the house you might wish you had done it; if however you are in Notting Hill or Kensington then the land you leave for a path might be worth half a million . . . A question best answered by your local building control.