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Overheating risk in New Dwellings
Takumi Sloan • April 26, 2021
The assessment of overheating risk in new dwellings within SAP has often been criticised as not detailed enough, particularly for high-risk scenarios Although the
overheating assessment of risk currently sits in AD L1A, it was not part of the Future Homes Standard consultation issued last year. Overheating buildings is a particular area of concern for the Government and this consultation proposes the following changes;
• Introduce a new regulatory requirement for overheating mitigation, alongside new statutory guidance, with the aim of reducing overheating risk in new-build residential buildings.
• Remove the requirement to check overheating risk from SAP and Part L and create a new Approved Document which contains the requirements for developers to ensure residential buildings do not overheat.
• Proposes two alternative approaches to demonstrating compliance with the new requirements;
A simplified method based on prescriptive measures which have different requirements based on location (Greater London or elsewhere) and dwelling type (Houses or flats and residential units)
A dynamic thermal analysis method using the CIBSE TM59 methodology
• Guidance on ensuring the overheating strategy does not provide unacceptable levels of noise at night for occupants.
• The information must be given to the owner about the strategy used to prevent overheating.
For further information on the risks of overheating in new dwellings please give us a call at Ashby Energy Assessors
and speak directly with James Rivers.
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