Measurement is a highly skilled and complex task, commonly known as ‘taking off’. This term refers to the practice of examining drawings and specifications prepared by architects or engineers, and taking off details of every item required to complete the project. A quantity surveyor must be able to fully understand the drawings and specifications in order to define the scope of the works.


The most important list of items that a quantity surveyor will prepare is the bill of quantities, or ‘BQ’.


What is a Bill of Quantities?

The bill of quantities is a list of items that in its entirety adds up to the whole project, such as a building. These items will include the materials, labour and services required. It uses a standard method of measurement recognized throughout the construction industry. This guarantees consistency and accuracy. Examples of ‘measurements’ include a single item, dimensions, weight and time.


What is the Bill of Quantities used for?

The bill of quantities takes into account the works required for a project in complete detail. It performs a variety of functions:

- It is used as a tender document to obtain estimates from contractors. This enables each contractor to calculate their prices on the same basis as their competitor.

- It will form part of the contract, so that both the client and contractors have an accurate record of the works.

- It is used as a guide throughout the project, so that the works can be effectively monitored and completed.


Schedule of works

A schedule of works is similar to the bill of quantities in that it is a list of items. However, it is not generally created using a standard method of measurement, and will often group items together which would be listed separately in the bill of quantities. A schedule of works is commonly drawn up at the early stages of a project before the drawings are finalized, and is not used for tender. It allows the client to understand the preliminary costs in order to define the overall budget and make design decisions.


Schedule of rates

A schedule of rates lists items required for individual parts of the building rather than the entire project. It can be used to gain an idea of costs for one particular part of the project.


Accurate measurement – why it matters

A quantity surveyor must ensure that they make accurate measurements in order to correctly obtain costs and define the parts of the building project. Inaccurate measurement can lead not only to additional costs or delays, but can result in contract disputes. If there are errors or omissions in the descriptions or quantities, disputes can arise between the contractor and the client which are difficult to resolve without expense.


To arrange a quantity surveyor to carry out measurements and prepare a bill of quantities or schedule of works or rates please contact us on 020 8532 2222.