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Building Regulations

Plain-English guidance on the regulations that shape building services – ventilation, energy, electrical safety and fire.

Modern apartment buildings with fully glazed façades and balconies

Building Regulations15 July 2026· 9 min

Part O Explained: The Overheating Rules Reshaping New Homes in London

The newest part of the Building Regulations is quietly redrawing façades across London. How the simplified method and CIBSE TM59 modelling actually work, why noise and security rules push most urban schemes into dynamic modelling, and where mechanical cooling legitimately fits.

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