We are all aware that the different toolkits require some generic and some bespoke inputs. When testing the veracity of the inputs, dont be afraid to ask for real time examples. For instance, BCIS figures are a blended average dependent upon the building type, but the any developer is likely to have provided their own figures to the BCIS, and you should be asking to see their submission so as to ascertain if their own build cost is lower than average. the same principle can be applied to fixed costs such as marketing and/or conveyancing, as the larger developers can achieve economies of scale not reflected within the toolkits
