Commercial and Residential Energy Assessments
Our team of qualified and licensed Energy Assessors can provide a wide range of the energy assessments needed for new, refurbished and public buildings to meet Government, building regulation and BREEAM requirements.
An Energy Performance Certificate (EPC) is required when a property is built, sold or rented and in most cases is required for both for domestic and commercial properties.
The EPC outlines how energy efficient a property is and provides an energy efficiency rating from A to G. This is calculated using the SBEM method and is based on the building’s design and construction data.
An EPC contains information about a property’s energy use and the typical associated energy costs based on the building fabric and energy systems installed. It also contains recommendations about how energy consumption could be reduced through applying energy-saving measures and cost-effective improvements.
An EPC is valid for a period of 10 years.
Standard Assessment Procedure (SAP) calculations are a requirement under Part L of the Building Regulations and are required for all new dwellings, and in some instances for new conversions or extensions.
A SAP calculation provides an energy rating for a new home, based on the building’s fabric, heating/ventilation systems and internal lighting and some standard assumptions for occupancy and behaviour. It enables comparison between the energy performance of different dwellings.
The SAP calculation will provide an overall figure between 1 and 100. The higher the SAP rating, the lower the energy costs and associated carbon emissions.
It is a legal requirement for a design stage SAP calculation to be completed prior to any construction works. The as-built assessment will then follow once the construction has been completed, together with the On Construction Energy Performance Certificate (OCEPC).
A Display Energy Certificate (DEC) provides information on a building’s operational energy consumption, with the objective of raising public awareness as well as informing visitors to a building about its energy use.
A DEC provides an operational rating between A and G based on the building’s energy consumption over the preceding 12 months. It is also accompanied by an Advisory Report (AR) which contains recommendations for improving the energy performance of the building in order to reduce overall energy consumption.
It is a mandatory requirement for all public buildings with a floor area exceeding 250m2 to display a DEC (this threshold was reduced from 500m2 in July 2015). The requirement to display a DEC has been in place since October 2008.
Where the floor area is >1000m2 a DEC is valid for a period of 12 months and must be renewed annually, and the accompanying AR is valid for a period of 7 years. For buildings between 250m2 and 1000m2, both the DEC and AR will be valid for 10 years.
SBEM and Part L Compliance Calculations
Simplified Building Energy Modelling (SBEM) is a calculation method used for new non-domestic buildings in order to demonstrate compliance with Part L Building Regulations.
SBEM is used to calculate the energy use and carbon emissions of a proposed building based on the design details. The SBEM calculation will produce a BRUKL report which is required by Building Control when submitting plans for new non-domestic buildings.
SBEM assessments are a mandatory requirement for all new commercial buildings >50m2. They are undertaken in two stages – the design stage SBEM and the as-built SBEM.