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.
Ilminster
Ilminster is a community and also civil parish in the countryside of south west Somerset, England, with a population of 5,808. Bypassed in 1988, the community currently exists just eastern of the junction of the A303 (London to Exeter) and also the A358 (Taunton to Chard as well as Axminster). The church consists of the district of Sea. Ilminster is mentioned in records dating from 725 as well as in a Charter given to the Abbey of Muchelney (10 miles (16 km) to the north) by King Ethelred in 995. Ilminster is additionally discussed in the Domesday Book (1086) as Ileminstre meaning 'The church on the River Isle' from the Old English ysle as well as mynster. By this duration Ilminster was a flourishing community and was approved the right to hold a weekly market, which it still does. Ilminster was part of the numerous Abdick as well as Bulstone. In 1645 during the English Civil War Ilminster was the scene of a skirmish in between legislative troops under Edward Massie and Royalist pressures under Lord Goring that defended control of the bridges prior to the Battle of Langport. The community has the structures of a sixteenth-century grammar school, the Ilminster Meeting House, which acts as the community's art gallery and also music hall. There is additionally a Gospel Hall.