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.
Woodstock
Woodstock is a market community as well as civil parish 8 miles (13 km) north-west of Oxford in Oxfordshire, England. The 2011 Census recorded a parish population of 3,100. Blenheim Palace, a UNESCO World Heritage Site, is next to Woodstock, in the parish of Blenheim. Winston Churchill was born in the palace in 1874 and hidden in the nearby town of Bladon. Edward, elder son of King Edward III as well as heir apparent, was born in Woodstock Manor on 15 June 1330. In his life time he was commonly called Edward of Woodstock, but is known today as the Black Prince. In the regime of Queen Mary I, her half-sister Elizabeth was locked up in the gatehouse of Woodstock Manor.