Space and Weight Allowances (BG 84/2024)

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This guide partly replaces BG 9/2011 Rules of Thumb 5th Edition. It provides updated space and weight allowances and new information on lifts and electrical switchgear.

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BSRIA’s Space and Weight Allowances guide provides useful information for the early stages of design. Graphs are provided on areas, heights and weights of mechanical, electrical and public health equipment. Information is also included on floor space allowances, space for access, occupancy densities and means of escape.

Download the sample preview to view the full table of contents.

This guide partly replaces BG 9/2011 Rules of Thumb 5th Edition. Information has been updated based on consultation with designers and manufacturers, and new information has been provided on lifts and electrical switchgear.

Three further guides have been published providing reference information, definitions and data for use at early stages of design:

BSRIA would be very pleased to receive feedback on this guide – what’s missing, what can be improved in the information and its presentation, and what else BSRIA can do to make buildings better. Please email any comments and suggestions to


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Product details

  • Published: February 2024
  • Publisher: BSRIA
  • Author: Chin Hang “Kay” Lam
  • ISBN-13: 978-0-86022-806-6