Just that really - just made an offer on a new house, really like to location but it has a small kitchen in an extension at the moment. There is a small open space between the kitchen extension and the fence with next door and I am thinking I would like to extend across, and have a bigger kitchen diner at the back of the house. it would probably be about 3 - 4 metres square, so not massive but it would make a nicer space for the kitchen. Any advice? What kind of costs should I expect?