When Do I Need a SBEM Calculation?

2 Minute Read-Time

For developers, architects, and builders working on non-residential projects in the UK, understanding when a Simplified Building Energy Model (SBEM) calculation is required is crucial for compliance and enhancing the energy efficiency of buildings. This article elucidates the scenarios necessitating an SBEM calculation, reflecting the latest guidelines under Part L Volume 2 of the Building Regulations.

Overview of SBEM Calculations

SBEM calculations are designed to assess the energy performance of new, extended, or modified non-residential buildings. This method calculates monthly energy use and carbon dioxide emissions, based on the building's geometry, construction, use, lighting equipment, and HVAC. It's an essential part of demonstrating compliance with Part L of the Building Regulations, which focuses on the conservation of fuel and power.

Requirement for SBEM Calculations in Non-Residential Properties
SBEM calculations are mandated in several scenarios, primarily:

New Constructions: All new non-residential buildings require an SBEM calculation to ensure they meet the energy efficiency and CO2 emissions standards set out in Part L Volume 2.

Extensions and Renovations: Significant modifications, including extensions or renovations to existing non-residential buildings that alter the energy profile, necessitate an SBEM calculation to verify compliance with updated standards.

Conversions: Changing the use of a building to a non-residential function may require an SBEM calculation, depending on the extent of the change and its impact on energy usage.

Process of Conducting SBEM Calculations

The SBEM calculation process involves several critical steps:

Data Collection: This includes detailed information on the building's geometry, construction materials, insulation levels, window types and orientations, HVAC systems, and lighting.

Modelling and Analysis: Using the collected data, the building's energy performance is modelled and analysed, focusing on heat flows, energy use, and carbon dioxide emissions.

Compliance and Recommendations: The output of the SBEM calculation indicates whether the building meets the required energy and emissions targets. If not, it suggests improvements to achieve compliance.

Importance of Early Engagement

Engaging with the SBEM calculation process early in the design phase is beneficial. It allows for the integration of energy efficiency measures into the project from the outset, potentially reducing costs and ensuring compliance before construction begins.

Compliance and Certification

Upon successful completion of the SBEM calculations, the building can receive its Energy Performance Certificate (EPC), a requirement for all new, sold, or rented non-residential buildings. The EPC rates the building's energy efficiency and CO2 emissions, providing a benchmark for its environmental impact.

In summary, SBEM calculations are a critical component of developing energy-efficient, compliant non-residential buildings in the UK. Understanding when these calculations are required and engaging with the process early ensures that buildings not only meet legal standards but also contribute to a more sustainable built environment.