Statutory guidance

Overheating: Approved Document O

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

Applies to England


Overheating: Approved Document O

Approved Document O: Overheating, frequently asked questions


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.