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.
Lairg
Lairg is a town and church in Sutherland, Scotland. It has a population of 891 and also is at the south-eastern end of Loch Shin. Lairg is uncommon in the north Highlands, if not one-of-a-kind, in being a big negotiation that is out the coastline. One of the factors that Lairg is a little larger than various other non-coastal Highland towns is its central area within the county of Sutherland. Having 4 roadways which fulfill in the town, it used to be called "The Crossroads of the North". In the 19th century, it was provided with a railway station, on what is now the Far North Line. This advancement suggests that the north-west of Sutherland is currently less complicated to reach. (The Far North Line links Inverness in the south with Thurso and Wick in the north.).