I’m new to this website so please excuse the ignorance. I provided data and obtained an estimated cost of £783/m2 (Standard finish/Main Contractor/E Midlands/2 storey/size medium). This compared with £970 from the May 2014 cost tables. Why the big variance? I am also unsure how the allowances are used eg for a Bespoke Kitchen cost of £4000 the calculator used £3402 after deduction of the default allowance of £598 (£5.13/m2) Is this in addition to the standard allowance of £3700 and is this allowance included in the build cost estimate of £783/m2?