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.
Strathdon
Strathdon is a location in Aberdeenshire, Scotland. It is positioned in the strath of the River Don, 45 miles west of Aberdeen in the Highlands. The main village in the strath is also called Strathdon, although it was initially called Invernochty due to its place at the confluence of the River Don and also the Water of Nochty. Strathdon is a casual geographical location. This means that there are no exact borders in regards to where it starts or ends. It is the founding location of the Lonach Highland and Friendly Society, and also the Lonach Highland Gathering. This is a conventional Highland Gathering with the hefty sport events such as throwing the caber, hammer and so on, and it also hosts a competitors of Highland dance. Dances include the noted 'Highland Fling', 'Sword Dance', 'Seann Triubhas' and also 'Reel of Tulloch'.