Mantle (geology) The mantle is a layer inside a terrestrial planet and some other rocky planetary bodies. For a mantle to form, the planetary body must be large enough to have undergone the process of planetary differentiation by density.
Found the The HandR Average Build Cost Guide on the homebuilding.co.uk website, which is exactly what I need for estimating the cost of newbuilds. From this got a cost of ~Â£1400 per m^2. I still don't have any accurate information on demolition though apart from on average 3/5-10k per house.ound the The HandR Average Build Cost Guide on the homebuilding.co.uk website, which is exactly what I need for estimating the cost of newbuilds. From this got a cost of ~Â£1400 per m^2. I still don't have any accurate information on demolition though apart from on average 3/5-10k per house.
Also, the biggest cost difference is in the blocks-anything from under a tenner to 30 per m2. For a total job, he uses a yardstick cost of 50 per m2, but each job is different and this can go up, or down, according to layout, underground pipes, finishing details etc.Hope this helps. Richard.ocation: Hemel Hempstead. Posts: 7,953. Hi Deep, expect a type1 (crushed concrete) base of no less than 150mm, 50mmm sand, then your 60mm driveway blocks, so a dig depth of 260mm across the board. Block paving is generaly 10 upwards per meter for the blocks themselves.