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.
Pencader
Pencader is a small town in the Welsh region of Carmarthenshire, as well as belongs to the Area and Parish of Llanfihangel-ar-Arth. It lies around 3 miles (5 kilometres) south-east of Llandysul as well as 6.5 miles (10 kilometres) south-west of Llanybydder, in the valley of the Gwen creek, quickly before the assemblage with the River Talog, to develop the River Tyweli (a tributary of the Teifi). It is a peaceful town with little bit more than 500 homes, 2 shops, as well as two bars. Pencader's background goes back a long way. For many years, it was just one of the primary stops on the Carmarthen - Aberystwyth rail route, and also was the joint for the service to Newcastle Emlyn; the Pencader Tunnel allowed solutions to get to Carmathen using Llanpumsaint. The decrease of the railways saw the Newcastle Emlyn branch line closed in 1952 and also the main line near to passengers in 1965.