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.
Ty Croes
Ty Croes is a small settlement 2 miles east of Rhosneigr, Anglesey, north Wales. It was, for a short time, the house of No. 144 Signals Device RAF, an RAF Strike Command mobile radar book. It has a train station on the North Wales Coast Line which runs in between Holyhead as well as Crewe. Ty Croes is home to Anglesey Circuit that holds occasions at both club and also national level. The circuit was expanded in 2006 and also is used by a variety of groups for testing both cars and trucks and motorbikes. One advantage of the circuit is its comparative remoteness (from London) which allows screening to be done without attracting too much focus.