You can build a garage, carport, shed, greenhouse, kennel fo r domestic pets, etc., as long as it does not extend out in fro n t of the building line of the house and does not exceed 4 metres in height, (if it has a tiled or slated pitched roof), or 3 metres (if it has any other roof type). The floor are a limitation for exempted development is 25 square metre s . The structure may not be lived in, used for commerc i a l purposes or for keeping pigs, poultry, pigeons, ponies or horses. Garages, sheds, etc. to the side of the house mu s t match the finish of the house. You cannot reduce the open space at the side or rear of the house below 25 square metres .