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SBEM Calculation Explained 

Low Carbon Energy Assessors (LCEA) Ltd provide Commercial Energy Performances Certificates, SBEM Calculations, Display Energy Certificates, M&E Quantity Surveying and Commercial Management Services throughout the whole of the UK.

What is a SBEM Calculation?

Simplified Building Energy Model (SBEM) calculates the monthly carbon dioxide emissions and energy used by a building given its construction, geometry, use, lighting equipment and HVAC. SBEM ratings are scored from a scale of 1 to 100, with 1 being the worst and 100 being a zero usage of energy.

The SBEM calculations produce a BRUKL certificate, which gives a rating for the building in question. If the BRUKL shows a pass then the project passes Building Regulations Part L. SBEM calculations and the requirements vary depending on whether it is a new build, extension or a refurbishment.

When do I need a SBEM Calculation?

They are design calculations that are required when you are refurbishing, building or extending commercial premises.

SBEM calculation is required in order to comply with Building Regulations Part L1B it is necessary to have SBEM calculations carried out on non-domestic construction projects. The SBEM calculations produce an SBEM report certificate, which shows the SBEM rating for the building in question. If the SBEM report certificate shows a pass then the project passes Building Regulations Part L1B. SBEM calculations and the requirements of the SBEM report vary depending on whether it is a new build, extension or a refurbishment.

New build SBEM calculations work out the target emission rating (TER) followed by the building emission rating (BER). The BER must be equal to or less than the TER in order for the SBEM rating to show a pass on the SBEM report certificate.

Who needs a SBEM Calculation?

SBEM Calculations are required on buildings such as: –

• First fit out of a shell and core building
• Retail Shops
• Hotels
• Public Houses
• Offices
• Leisure centres
• Care homes
• Community buildings
• Schools
• Universities
• Warehouses

What does a SBEM Calculation provide?

They provide a carbon footprint of the proposed building (and are required by Building Regulations Part L) and tell you the energy cost and carbon emissions generated at the design stage of a project.

Very often changes will be made after the calculations in liaison with the architect, developer or client to ensure that the construction complies with the latest regulations. It is essential to engage with an accredited consultant before finalizing the design.

What is the connection between SBEM and an EPC?

Once the construction has been completed and all works have been carried out as per the sbem specifications, an energy performance certificate (EPC) is produced from sbem calculations.

Why choose LCEA Ltd to carry out your SBEM calculations?

LCEA Ltd deals regularly with building control officers in councils and have been recommended by several councils that we work with regularly.

Our staff are fully accredited or equipped to answer any questions or queries you may have.

Send us your plans and we will do the rest. For further information on sbem calculations feel free to call and speak to one of experienced consultants


iSBEM Software and User Guides v5.3.a

Current approved version of iSBEM version 5.3.a for carrying out the Building Regulations Compliance checks, Commercial EPCs or Commercial Green Deal Assessments from the 6th April 2014 for England.

iSBEM_v5.3.a software

17th March 2017

click here to download
iSBEM_v5.3.a Patch 01 click here to download
iSBEM_v5.3.a Patch 02 click here to download
iSBEM_v5.3.a Patch 03 click here to download
iSBEM_v5.3.a Patch 04 click here to download
iSBEM User Guide

13October 2016

click here to download
Installation Instructions for 5.3.a

20 November 2015

click here to download
Non Domestic Building Services

Compliance Approved Guide

2013 Edition

click here to download


Other useful downloads

NCM Databases for iSBEM click here to download
England NCM Modelling guide 2013 edition. Note includes Oct 2016 updates. click here to download
SBEM Technical Manual –

20 November 2015. 

click here to download


Other superseded documents:-

1.1) 1.1 iSBEM_User_Guide_v5.2.d_Basics_31Jul14 – Released Oct 2016 above.

1.2) iSBEM User Guide v5.2.d Compliance – Released 31 July 2014
1.3) 1.3 iSBEM_User_Guide_v5.2.d_EPC_31Jul14
2) 02. SBEM-Technical-Manual_v5.2.d_31Jul14– Released 20 November 2015 above.
3) 03. NCM_Modelling_Guide_2013_Edition_06April2014– Re-released Oct 2016 updates above.

More About LCEA Ltd

We are Chartered Quantity Surveyors with Building Engineering Services knowledge. Providing Mechanical & Electrical Quantity Surveying Services and Energy Efficiency (Low Carbon, CO2) energy expertise.

We provide independent energy monitoring and reporting for the carbon reduction commitment energy efficiency scheme (CRC) and Lead Energy Assessors under the Energy Savings Opportunity Scheme (ESOS)* Our Surveyors are Security Cleared at Heathrow Airport and Criminal Records Bureau (CRB) Cleared.

We are accredited commercial energy assessors delivering the requirements set out within the Energy Performance of Buildings Directive for the following:-

• Display Energy Certificates
• Air Conditioning Inspections TM44
• Commercial Green Deal Assessments
• Part L Building Regulation (SBEM) compliance checks
• Energy Management and Modeling Services – CIBSE TM54
• Energy Savings Opportunity Scheme (ESOS) Lead Assessors
• Commercial & Residential energy performance assessments
• Mechanical and Electrical (M&E) Quantity Surveying Services
• Commercial Management, Contract Administration and Cost Verification Services.
• We are accredited by the Institution of Civil Engineers (ICE) – for Project Managers and Commercial Managers working on the NEC3 Engineering & Construction Contracts.

Low Carbon Energy Assessors (LCEA) Ltd (6682232) a limited company registered in England and Wales and regulated by The Royal Institution of Chartered Surveyors Regulation Authority.