Building 
Regulations

Part L Calculations

There are two main methods for carrying out Part L calculations. 

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Simplified Energy Model (SBEM) - Primarily used for non-domestic buildings such as offices, shops and schools. 

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Standard Assessment Procedure (SAP) - Used for domestic properties.

Both methodologies evaluate a building's energy performance by considering several factors, including:

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• Construction materials

• Insulation levels

• Efficiency of heating, cooling and ventilation systems

• Efficiency of lighting solutions

• Building orientation and shape

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The primary aim of Part L is to reduce carbon emissions. More efficient buildings consume less energy which leads to a reduction in greenhouse gas emissions and a lower carbon footprint. 

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Efficiency also helps to reduce running costs which equates to reduced energy bills for homeowners and businesses. 

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Part L Regulations are mandatory. Failure to meet the required standard can result in penalties or even a planning rejection. 

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With sustainability at the forefront of construction standard's across the globe energy standards continue to become more stringent. Ensuring buildings meet or exceed current Part L standards means they are better prepared for future updates to regulations. 

Part O Calculations

Part O covers overheating in new residential buildings only. Part O was introduced in 2021 with the aim of encouraging the design and construction of buildings that limit unwanted solar gain during summer months, providing occupants with adequate interior cooling. 

Energy Statements

Energy Statements outline how a building will meet energy efficiency standards set by the local planning authority. The statement will cover all aspects of the energy efficiency plan for your building.