Simplified Building Energy Model, or SBEM, is a methodology to assess the energy consumption of non-domestic and commercial buildings, much like SAP calculations for domestic dwellings.
The model calculates the thermal efficiency, the amount of energy consumed and carbon emissions of the occupied building annually based on the building’s design, construction, lighting, Heating, ventilation, and air conditioning(HVAC).
SBEM calculations are used to demonstrate compliance with the Building Regulation UK Part L (BRUKL). A BRUKL compliance report and certificate is required for all new commercial and non-domestic dwellings, or refurbishment projects over 50m2, to prove they have been designed to comply with UK building regulations.
The BRUKL document is required by Building Control prior to works starting onsite. The BRUKL document is mainly required for new builds (and in some cases extensions) but can also be used for existing buildings if any of the minimum standards are not met, to demonstrate the CO2 has been compensated for elsewhere.
A planning authority rules may dictate that a higher standard is required. For instance in London, there are carbon targets to meet where the GLA will typically require a 35% improvement beyond Part L for major developments. Local authorities may also set extra requirements for wider sustainability measures such as BREEAM.
There are different tools that we can use to carry out SBEM assessments. You may see references to things like iSBEM, DesignBuilder, IES and TAS but they all use the underlying SBEM methodology.
The difference is that tools like DesignBuilder, IES and TAS offer the ability to carry out DSM (Dynamic Simulation Modelling) analysis. These tools allow the assessor to carry out full 3D modelling and give a much more accurate and tailored assessment, allowing for more design flexibility and the ability to design out the things we don’t want, like overheating, and design in the things we do want, like daylighting levels and occupant comfort.
At CAMSONS we have qualified and experienced SBEM assessors working across the UK. Please Call 0333 577 5020 or email at info@camsons.co.uk to discuss your business needs or to get a quote for SBEM calculations / BRUKL report.