Like the layers of caramel shortbread slipping over one another in the hot sun, in a translational landslide the mass moves along a roughly planar, flat, surface with little rotation or backward tilting.
According to a customer the average cost of a home extension is Â£25,000. A Double Storey Extension costs between Â£45,415 and Â£76,000. A Single Storey Extension costs between Â£22,916 and Â£37,000. Planning and Preparation for a home extensions costs between Â£5,132 to Â£10,150.he approximate price of a timber extension to work on is around Â£1200 per square meter based on Evis Build for a 60 square meter rear extension. For a double storey extension, you should consider about 160% of the price for a single storey extension of the same floor area.
If you plan to buy most of the raw materials and undertake much of the work yourself, Channel 4 estimates that a single storey (20 metre square) extension will cost Â£15,900 (or Â£795 per square metre) whilst a two storey (40 metre square) extension will cost Â£28,040 or (Â£701 per square metre).ouse extension costs vary significantly from project to project. Depending on size, complexity and location, an extension can cost anything from a few thousand pounds to a six figure sum.