Definition:
A quantity survey is a detailed and comprehensive assessment of the quantities of materials and labor required for a construction project. It's a crucial part of the pre-construction phase, forming the foundation for:
* Cost estimates: Accurate quantity surveying is the key to creating realistic project budgets.
* Tendering: Contractors use the quantities to bid on the project, allowing for fair comparison.
* Material procurement: The survey helps determine the exact amounts of materials needed.
* Project planning: The quantities inform the scheduling of work and resource allocation.
Key Elements of a Quantity Survey:
* Measurement: Using drawings and specifications, the surveyor meticulously measures all elements of the project, including:
* Building volumes (concrete, brickwork, etc.)
* Finishes (plaster, paint, tiles)
* Services (electrical, plumbing, HVAC)
* Site works (excavation, landscaping)
* Bill of Quantities (BOQ): The surveyor compiles a detailed list of each item, along with its unit of measurement (e.g., cubic meters, square meters, linear meters).
* Pricing: While the surveyor does not typically set the price, the BOQ provides a basis for cost estimation by adding unit prices to each item.
Why is it important?
* Accuracy: A well-executed quantity survey minimizes errors and omissions, preventing costly overruns later.
* Transparency: It provides a clear and detailed breakdown of project costs, enhancing transparency and accountability.
* Efficiency: The survey streamlines the bidding and procurement processes, saving time and money.
Note:
While the term "quantity survey" is common, it's important to note that different regions may have varying definitions and terminology. For example, in the UK, the term "bill of quantities" is often used interchangeably with "quantity survey."