The first refers to a specific item, e.g., "additional alterations to services when installing said shower unit", where an item for alterations to existing services is not contained within the bill of quantities but some work is envisaged. The item refers to unforeseeable cost likely to be incurred during the contract. There are different styles of bills of quantities, mainly the elemental bill of quantities and trade billsĪ contingency sum is an item found within a bill of quantities. The practice historically of estimating building costs in this way arose from non-contractual measurements, taken off drawings to assist tenderers in quoting lump sum prices. Bill of quantities are prepared by quantity surveyors and building estimators, and "Indeed the bill of quantities was the raison d'être for the development of quantity surveying as a separate profession."
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