You may need planning permission if you are planning a larger extension. All extensions will need building regulations approval. An architect can assist with this and if planning permission is required. A reputable contractor will also be able to advise you if this is needed as well.
Kingsbridge
Kingsbridge is a market community and visitor hub in the South Hams area of Devon, England, with a population of 6,116 at the 2011 census. Two selecting wards birth the name of Kingsbridge (East & North). Their combined population at the above census was 4,381. It is situated at the north end of the Kingsbridge Tidewater, a ria that extends to the sea six miles southern of the town. It is the third biggest negotiation in the South Hams and is 32 miles (51 km) south-southwest of Exeter. The community developed around a bridge which was built in or prior to the 10th century in between the royal estates of Alvington, to the west, and Chillington, to the east, hence giving it the name of Kyngysbrygge ("King's bridge"). In 1219 the Abbot of Buckfast was granted the right to hold a market there, and also by 1238 the negotiation had actually come to be a borough. The chateau continued to be in possession of the abbot until the Dissolution of the Monasteries, when it was granted to Sir William Petre. Kingsbridge was never ever stood for in Parliament or included by charter, the local government being by a portreeve. It lay within the thousand of Stanborough.