Statutory guidance

Overheating: Approved Document O

Building regulation in England setting standards for overheating in new residential buildings.

Applies to England



This Approved Document covers the overheating mitigation requirements of the building regulations as set out in Part O of Schedule 1 to the Building Regulations and in a number of specific building regulations. Technical guidance is contained in Approved Document O. Approved Document O applies to new residential buildings.

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Published 15 December 2021
Last updated 15 June 2022 + show all updates
  1. Added Approved Document O frequently asked questions.

  2. Republished with corrections which can be found in Circular 01/2022 - Minor misprints have been corrected.

  3. First published.