- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 15 Nov 2018
Functional unit of buildings
The New Rules of Measurement (NRM) are published by the Royal Institute of Chartered Surveyors (RICS). They provide a standard set of measurement rules for estimating, cost planning, procurement and whole-life costing for construction projects.
‘…a unit of measurement used to represent the prime use of a building or part of a building (e.g. per bed space, per house and per m2 of retail area). It also includes all associated circulation space.'
‘…a rough budget-setting technique which consists of selecting a suitable standard functional unit of use for the project, and multiplying the projected number of units by an appropriate cost per functional unit.’
'...a qualitative description of function specifically defined for the product/service under study and any alternative product/services to which it is compared. The use of a functional unit means that the alternative designs under study are, in theory, compared fairly. For example, a comparison of external walls may be based on every external wall design in the study achieving a U-value of 0.3 W/m²K and compliance with building regulations.'
 Find out more
 Related articles on Designing Buildings Wiki
Featured articles and news
Disallowed costs vs. defined costs. Which is which?
Coping with the loss of local authority conservation services.
Remedial works could save the NHS £95 million a year.
One of Europe’s largest waterfront transformations.
How BIM was used to produce an information model of a home.
Skyscrapers of the future will be built of wood.
How to increase your chances of winning.
Benefits, not cost, should be the focus.
Formula E drives electric vehicle market forward.
Moorfields building sets UK pile-loading record.