We are just about to commence building an adjoining garage onto the side of our house which will cover our driveway. Because of the limited space available we wish to build on the boundary between ourselves and neighbour, for which he has given us permission. Our builder however informs us that this wont be possible as the guttering will hang over the neighbours driveway. Does anyone know of any design we could use which would mean we could build on the boundary and still have effective guttering?