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.
Chathill
Chathill is a village in Northumberland, in England. It is positioned about 9 miles (14 km) north of Alnwick and 3 miles (5 km) inland from the North Sea coast. Chathill is inside the parliamentary constituency of Berwick-upon-Tweed. The village includes a permanent population of below 10000 inhabitants. It's served by Chathill railway station. The station also serves the close by villages of Seahouses, Embleton, Bamburgh and Belford. Although positioned on the East Coast Main Line, the station is served by just two arrivals and departures, Mondays to Saturdays, delivering commuting links both to and from Newcastle upon Tyne. The station was for a lot of years served by loco-hauled stopping trains between Newcastle, Berwick-upon-Tweed & Edinburgh Waverley (the British Rail timetable for 1982 had four departures each way from here), however these were reduced in frequency and, therefore, curtailed at Berwick by BR at the latter end of the 1980s and subsequently withdrawn altogether north of Chathill following the introduction of electric working on the ECML in 1991. Chathill is recognised as being home to Preston Pele Tower, which was built between 1392 and 1399. One of its former owners was Sir Guiscard Harbottle of Beamish, who was killed at the Battle of Flodden, the conflict in between the Kingdom of England and Scotland, who was also an ancestor of Diana, Princess of Wales. The tower has a clock, which was erected in 1864, and it features mechanisms similar to Big Ben. For all your home upgrades, be certain that you utilise trustworthy experts in Chathill to ensure that you get the top quality.