Part O Overheating

Expert Part O Compliance Across the UK Since 2005

Introduced in the 2021 Building Regulations update, Approved Document O aims to limit unwanted solar gain and ensure adequate overheating mitigation in new dwellings. At Crowther Solutions Ltd, we provide the technical expertise required to navigate these complex requirements, offering both the Simplified Method and Dynamic Thermal Modelling for developments throughout the UK.

Our Part O Assessment Methods

1. The Simplified Method (Section 1)

Using industry-leading Elmhurst Energy calculation tools, we apply the precise conventions detailed in Approved Document O 2021. This method is ideal for standard residential designs that fall within the simplified criteria for glazing-to-floor-area ratios and cross-ventilation.

2. Dynamic Thermal Modelling (DSM Approach)

For more complex architectural designs, high-risk locations, or buildings that do not meet the "Simplified" criteria, we undertake advanced thermal modelling.

CIBSE TM59 Compliance: Our assessments are performed in accordance with CIBSE AM11 using IES Apache software.

Professional Reporting: We provide a comprehensive Part O Compliance Report suitable for Building Control submission.

Strategic Solutions: If your initial specification does not comply, our service includes one specification upgrade to ensure your project reaches the required standard without compromising on design.

Why Choose Crowther Solutions?

With two decades of experience in UK building compliance, we understand how Part O interacts with SAP 10.2 and Part L. Our oversight ensures that your overheating strategy is practical, cost-effective, and fully compliant with the latest national standards.

Speak to a Part O Expert Today

Direct Technical Support: 07814 462828