A systematic process of measuring, calculating, and documenting the quantities of materials, labor, and resources required for construction projects.

A quantity survey is a systematic process of measuring, calculating, and documenting the quantities of materials, labor, equipment, and resources required for construction projects through detailed analysis of drawings, specifications, and project scope to support accurate cost estimation, procurement planning, and project management. This comprehensive measurement activity involves the application of standardized methods, mathematical calculations, and professional expertise to break down complex construction projects into measurable components and establish precise quantities for each element of work. Quantity surveys serve as fundamental tools for project planning and control, providing the quantitative foundation for bidding, budgeting, scheduling, purchasing, and progress monitoring while enabling informed decision-making throughout the project lifecycle.

Quantity surveys are conducted across various construction project phases and applications including pre-construction surveys that support feasibility studies, preliminary cost estimates, and design development by providing early quantity assessments, tender and bidding surveys that enable accurate cost estimation and competitive pricing through detailed quantity analysis, procurement surveys that support material ordering, supplier negotiations, and delivery scheduling by providing precise material requirements, construction phase surveys that track actual quantities installed against planned quantities for progress monitoring and payment applications, and post-construction surveys that document final quantities for project closeout, warranty purposes, and lessons learned analysis. Each application requires specific levels of detail and accuracy appropriate to the intended use and project phase.

The quantity survey process and methodology involves comprehensive document analysis including thorough review of architectural drawings, engineering plans, specifications, schedules, and other contract documents to understand project scope and requirements, systematic measurement and calculation using standardized methods, units of measure, and industry conventions appropriate to different materials and work types, application of appropriate adjustments including waste factors, overlap allowances, and construction method considerations based on site conditions and installation requirements, organization and documentation of quantities in structured formats that support cost estimation, procurement, and project management activities, and quality assurance through checking, verification, and validation procedures that ensure accuracy, completeness, and consistency. Modern quantity surveys often incorporate digital tools and building information modeling to enhance accuracy and efficiency.

Fun Fact: The first recorded quantity survey was performed for the construction of Westminster Abbey in 1245 CE, where monks systematically calculated stone, timber, and labor requirements, establishing measurement practices that evolved into the modern profession of quantity surveying used worldwide today.

• Quantitative Survey
• Quantity Estimator
• Quantity Surveyor