Unusual, Unique Structures And Weird Buildings On Earth

 A contractor will calculate how much a renovation or extension project is going to cost in labour and materials, plus specialist trades such as electrics and plumbing, which are typically subcontracted, as well as preliminaries (site set-up costs, welfare facilities, scaffold, permits and permissions). They will add a charge for their own management time, plus an element of profit, typically between 15 and 20 per cent of the total cost. In addition, the cost of a builder can fluctuate due to economic reasons, if materials are limited due to supply, then the cost of these will increase, elevating your overall project cost.