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.
Midhurst
Midhurst is a market community, parish [3] and also civil parish in West Sussex, England. It pushes the River Rother 20 miles (32 kilometres) inland from the English Channel, as well as 12 miles (19 kilometres) north of the county town of Chichester. The name Midhurst was first recorded in 1186 as Middeherst, indicating "Middle wooded hillside", or "(location) amongst the woody hills". It stems from the Old English words midd (adjective) or mid (preposition), meaning "in the middle", plus hyrst, "a woody hillside". The Norman St. Ann's Castle dates from concerning 1120, although the structures are all that can now be seen. The castle, the parish church of St. Mary Magdalene as well as St. Denis, together with South Pond, the former fish-pond for the castle, are the only 3 structures left from this very early period. The parish church is the earliest structure in Midhurst. Simply throughout the River Rother, in the parish of Easebourne, is the ruin of the Tudor Cowdray House.