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.
Grange-over-sands
Grange-over-Sands is a community and civil parish located on the north side of Morecambe Bay in Cumbria, England. Travelling by road, Grange Over Sands is 13.1 miles (21.1 km) to the south of Kendal, 14.9 miles (24.0 kilometres) to the east of Ulverston, 25 miles (40 km) to the eastern of Barrow-in-Furness as well as 28.1 miles (45.2 kilometres) to the west of Lancaster. Historically part of Lancashire, the town was developed as a city area in 1894. Since 1974, following local government re-organisation, the community has actually been provided as part of the South Lakeland area of Cumbria, though it remains part of the Duchy of Lancaster. It had a population of 4,114 at the 2011 Census.