NEWS 11 GUIDANCE
CIBSE in collaboration with Arup, Loughborough University and Inkling, launches updated CIBSE TM59 guidance to help tackle overheating risk in homes
CIBSE in collaboration with Arup, Loughborough University and Inkling, has launched the updated CIBSE TM59 Overheating risk in dwellings: A design stage methodology, providing the industry with revised guidance for assessing and mitigating overheating risk in new homes and major residential refurbishments. Referenced within Part O of the Building Regulations, CIBSE TM59 is widely recognised as a key industry resource for evaluating overheating risk in residential buildings. The updated publication refl ects the latest research, industry experience and evolving understanding of how homes can be designed to remain comfortable and resilient in a warming climate. The guidance comes at a time when overheating is becoming an increasingly important issue across the residential sector in the UK. Evidence continues to show that many new and existing homes are vulnerable to excessive indoor temperatures due to factors such as extensive glazing, insuffi cient ventilation
strategies and building designs that are not adequately adapted to future climate conditions.
Drawing on practical application and academic research, the revised CIBSE TM59 strengthens the methodology used to assess overheating risk and supports the delivery of homes that are resilient, energy effi cient and fi t for the future. The publication incorporates updated approaches to evaluating bedroom overheating, informed by recent research undertaken by Loughborough University and includes revised modelling guidance for ceiling fans, recognising their role as an effective low-energy measure for improving occupant comfort. The development of the updated guidance has also benefi ted from industry testing and application across real projects.
A key enhancement within the new edition is the requirement for all homes to be assessed under unconstrained conditions using future weather fi les representing the 2050s climate. This
approach places greater emphasis on passive design measures at the earliest stages of development, helping designers create buildings capable of maintaining comfortable internal conditions without relying on energy-intensive cooling systems. The updated guidance is expected to strengthen design stage decision making, improve consistency in overheating assessments and support the delivery of homes that are resilient to future climate conditions while reducing reliance on energy intensive cooling.
The publication has relevance across a wide range of sectors and disciplines, including residential design, natural ventilation, building performance, sustainability, retrofi t and refurbishment, climate resilience and government policy. The guide was authored by Susie Diamond of Inkling (Lead Author), Becci Taylor and Antonietta Canta of Arup. The publication was executive edited by Professor Kevin Lomas of Loughborough University.
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