SBEM Calculations and DSM (L2A)

All new non-residential buildings must comply with Part L2A of the Building Regulations; the Simplified Building Energy Model (SBEM) and Dynamic Simulation Modelling (DSM) are both approved methods for undertaking Part L2A compliance calculations.

SBEM & DSM Methods

Simplified Building Energy Model (SBEM) and Dynamic Simulation Modelling (DSM) calculate the energy used and CO2 emissions generated by a building, through the modelling of the building’s features, including:

  • Building Geometry, location and orientation
  • Thermal Performance (U-values, air tightness)
  • Building Services (HVAC)
  • Lighting
  • Controls


Whilst both SBEM and DSM methods are approved for undertaking compliance assessments; DSM is a significantly more accurate assessment and in the majority of cases DSM offers the design team significant benefits, not least of which is peace of mind.

DSM Calculations

DSM calculations run iterations at 10-minute intervals throughout the year, linking to actual historical weather data and accurate sun path analysis. It is such features, not available in SBEM, which provide the greatest benefit to assessment.

Stroma Tech’s team of Energy Assessors are all trained and accredited in the use of industry-leading DSM software, IES Virtual Environment.

Stroma Tech’s Approach to Part L2A 2013 Compliance

With an additional 9% reduction required in CO2 emissions compared to 2010 standards, meeting compliance requirements with Part L2A 2013 is becoming increasingly more challenging.

• Stroma Tech can assist you in reducing this compliance burden with our 3 tier approach.
• Flexible and cost-effective, we match our SBEM and DSM services with the needs of our Clients.
• From “sense check” compliance only assessments
• To guidance and assistance all the way from the concept stages through to project completion.

We deliver improved cost certainty, along with the benefit of value-added assistance throughout the project.

Complementary Services

• SAP Calculations
• DECs
• EPCs


Here you will find some of our case studies.
Stroma Tech. All Rights Reserved
Part of the Stroma Group
Titanic Belfast, The Signature Building
Phil Carr