Last edited 22 Feb 2021

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BSRIA Institute / association Website

Rules of Thumb - Guidelines for building services

Rules of Thumb - Guidelines for building services (5th Edition) (BG 9/2011) was written by Glen Hawkins and published by BSRIA (Building Services Research and Information Association) in April 2011.

Bsria rules of thumb.jpg

The book is a valuable source of engineering design, environmental performance and project cost data for building services projects.

The rules of thumb provided are general principles derived from practice and experience. They have been created by referencing a range of contemporary sources and reflect current design practice. They can be useful in the early stages of design, such as briefing, feasibility studies and early concept design, helping assess:

They can also be used in later stages to ‘sense check’ detailed calculations and assess ‘what if’ scenarios.

The latest edition has been updated and expanded to provide more detailed information, including:

The book is subdivided into 7 colour-coded sections:


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