TM59 Overheating Analysis A Modern Family Home Designed for Comfort and Compliance

This brand-new, privately commissioned family home features extensive glazing, including high-performance triple-glazed units, flooding the interior with natural light and framing woodland views. But with high glazing ratios come challenges—particularly around energy efficiency and overheating risk.

Early-stage support proved essential. Through detailed SAP calculations and overheating analysis, the design was optimised to meet the requirements of Part L and Part O of the Building Regulations, without compromising the architectural intent.

Working from CAD drawings supplied by the architect McManus Design, the energy performance was modelled to ensure the home met compliance standards and would be comfortable year-round. Glazing ratios, ventilation strategies, and fabric efficiencies were carefully reviewed to strike the right balance between form and function.

Part O of the Building Regulations is all about making sure homes don’t overheat, especially during those hotter months. CIBSE TM59 offers guidance on how to assess the risk of overheating and find ways to reduce it, ensuring the home stays comfortable and energy efficient.

Key Outcomes:

• Full compliance with Part L (SAP) and Part O (Overheating), supporting planning and building control.
• Validation of a heavily glazed design without the need for major redesign.
• Future-proofed comfort through passive design measures tailored to site and layout.

Why This Matters

More and more homeowners are pushing the boundaries of design—but regulatory compliance still matters. Whether designing a one-off new build or overseeing a small development, understanding how glazing, insulation, and ventilation interact can make the difference between approval and delay.

Services Provided:

• As designed SAP calculations
• Part O Overheating Analysis