How much shall it cosst me roughly to get a rear extension done 6 meter long and 5.3 metere wide, move drain fom back to side of the property. move boiler from existing kitchen to the rear of the extension where a new kitchen will be made and make a new toilet with a shower cubicle. fit 2 skylight windows two pvc standard doors one window in the kitchen and one in the bathroom. fitting of new kitchen.