There has been more progress this week and the sub-base laid and compressed. The next job is to lay a skin of sand, followed by a damp-proof membrane (can't remember the brand but you might know it), then some insulation and a further damp-proof layer. And finally concrete to cap it all. Now that the ground is flat and level inside the walls you can get a good idea of how much space there will be in both rooms and let me tell you we are going to be able to spread out so much more!