Simplified Building Energy Model SBEM
The National Calculation Method (NCM) describes the procedure, for buildings other than dwellings, for demonstrating compliance with the carbon emission requirements of regulation 17C of the Building Regulations and calculating 'operational ratings' and 'asset ratings' in the production of Energy Performance Certificates (EPC's).
The NCM provides the underlying method and the standard data sets necessary to calculate the annual energy use of a proposed building and comparing it with the energy use of a 'notional' building of a similar type, under similar circumstances. This is done by calculating the Target Emission Rate (TER - the CO2 emission rate for the notional building) and comparing this with the Building Emission Rate (BER) for the proposed building. The BER must not be higher than the TER.
The calculations can be performed using approved simulation software (Approved Dynamic Simulation Models (DSMs)) or by using the Simplified Building Energy Model (SBEM), a computer programme developed by BRE and available to download from the NCM website. Unlike some of the DSM's, SBEM is a 'simplified' compliance tool, rather than a design tool.
The Simplified Building Energy Model was originally based on the Dutch 'Energy Performance of Non-Residential Buildings' (NEN 2916:1998). It has been available to demonstrate compliance with Part L of the Building Regulations since 2006, and for Energy Performance Certificates since 2008.
It calculates monthly energy use and carbon dioxide emissions, given a description of the building which is entered through its user interface iSBEM, based on:
- Building type.
- Building geometry.
- Heating, ventilation and air-conditioning (HVAC).
- Lighting equipment.
A design stage SBEM assessment should be completed before the construction starts, and then an as-built SBEM when construction is completed, which includes the results of an air permeability tests and demonstrates the building has been constructed in accordance with the design. This is referred to as a Building Regulation UK Part L report (BRUKL).
2013 revisions to Part L of Building Regulations, which took effect on 6 April 2014 have been implemented in a new version of SBEM, cSBEM. SBEM may still be used on projects for which transitional arrangements apply, see 2013 changes to the approved documents for part L of the building regulations for more information.
 Related articles on Designing buildings Wiki
- 2013 changes to the approved documents for part L of the building regulations.
- Air tightness.
- Approved documents.
- Building Research Establishment.
- Building Regulations.
- Conventions for U-value calculations (2006 edition) BR 443.
- Emission rates.
- Energy Performance Certificates.
- Energy Performance of Buildings Directive.
- National Calculation Method.
- Non-domestic private rented property minimum standard.
- Standard Assessment Procedure.
- U-value conventions in practice: Worked examples using BR 443.
 External references
- National Calculation Method.
- National Calculation Methodology (NCM) modelling guide (for buildings other than dwellings in England and Wales) 2010 Edition.
Featured articles and news
Find out about the different types of delays on construction projects.
Researchers at Wien university have developed new system to create an inflatable concrete structure.
ICE responds to the first consultation on the government's industrial strategy post-Brexit.
Take a look at this newly-opened tower in Chicago with a remarkable 20:1 height-to-base ratio.
An Arc de Triomphe for the late-20th century, the La Grande Arche of Paris.
Richard Hayward of Legrand asks whether technology could help developers meet the needs of an increasingly diverse population.
Thomas Heatherwick's ambitious steel structure begins construction.
The principles, practice and formwork of one of the most important components of modern architecture.
New report claims that inappropriate standards and regulations are holding back the use of composites.
The global smart homes and smart light commercial market will grow fastest in the UK.
Futurist Thomas Frey explores the concept of Disposable Housing - could it be a reality sooner than we imagine?