It depends on the size and type of extension. Small porches or flat roof extensions are very reasonably priced. More substantial two storey extensions can be expensive. In general, the price is roughly proportional to the amount of space you add to your home.
Walsingham
Walsingham is a town in North Norfolk, England, famous for its spiritual temples in honour of the Virgin Mary. It likewise has the ruins of two medieval monastic houses. The civil parish, including Little Walsingham and also Great Walsingham, together with the depopulated middle ages village of Egmere (grid recommendation TF 897 374), has an area of 18.98 km ². At the 2011 census, it had a population of 819. Walsingham is a major centre of Pilgrimage. In 1061, according to the Walsingham tale, a Saxon noblewoman, Richeldis de Faverches, had a vision of the Virgin Mary in which she was instructed to construct a reproduction of your house of the Holy Family Members in Nazareth in honour of the Annunciation. Her family name does not show up in the Domesday Book. When it was constructed, the Holy House in Walsingham was panelled with timber as well as had a wood statue of an enthroned Virgin Mary with the child Jesus seated on her lap. Amongst its relics was a phial of the Virgin's milk. Walsingham became one of north Europe's excellent places of trip and also stayed so via a lot of the Middle Ages.