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.
Coniston
Coniston is a village as well as civil parish in the Furness area of Cumbria, England. Historically part of Lancashire, it is located in the southerly part of the Lake District National Park, between Coniston Water, the 3rd lengthiest lake in the Lake District as well as Coniston Old Man; about 25 miles (40 km) north eastern of Barrow-in-Furness. Coniston is located on the western coast of the north end of Coniston Water. It sits at the mouth of Coppermines Valley as well as Yewdale Beck, which descend from the Coniston Fells, historically the area of ore as well as slate mining. Coniston's place hence developed as a farming village and also transportation hub, offering these areas. Coniston was situated in the very north-west of the historical county of Lancashire, with Coniston Old Man forming the county's highest point. Today Coniston forms part of the Lake District National Park, the management county of Cumbria as well as the city government district of South Lakeland. Coniston belongs to the selecting ward called Coniston as well as Crake Valley. The overall population of this ward as taken at the 2011 Census was 1,575.