South Africa Building Regulations

The IES Consulting team are highly experienced in virtual building analysis for clients across the world. Our expertise covers numerous modelling protocols and green building rating schemes, enabling you to choose a design solution that not only complies with local regulations but also creates the best possible building for your client, taking cognizance of the cost of proposed interventions. The same simulation can be used to assess compliance with SANS 10400-XA and achieve extra credits with Green Star, reducing the duplication of work.

Our services include:

  • Provision of compliance simulations for new / existing buildings regardless of size / complexity.
  • Compliance energy modelling as part of the design process.
  • In-use building energy auditing to guide operation strategies to improve performance for measured EPC ratings as per SANS 1544 (2014). Our software can assess energy use by source, by metered system, and by end use, to assist in identifying poorly performing areas of your building.
  • Tailored expert design and compliance modelling / mentoring service helping you to achieve the most from using the VE.

IES can assess compliance with SANS 10400-XA (2011) either by:

  1.  Assessing the theoretical annual energy demand and consumption, based on the proposed design and design assumptions, to ensure that they are less than or equal to the values supplied in Tables 2 and 3 of SANS 10400-XA for the stipulated building typology.
  2. Performing a rational design assessment to assess if the proposed building has a theoretical annual energy usage performance, determined using our certified thermal calculation software, such that consumption and demand is less than or equal to that of a reference building that complies with the requirements of SANS 10400-XA 4.2.1(b).


Our software is certified by Agrément South Africa as fit for thermal modelling or calculation purposes in terms of the National Building Regulations, specifically for use in regulation XA.

In addition an IES employee is active on the committee for SANS 10400-XA as our commitment to local development.

Hot Water Systems

Our mechanical team can prove, using our certified software that the proposed hot water heating system provides at least 50% (volume fraction) of the annual average hot water heating requirement by means other than electrical resistance heating.

  • For solar geysers, we can perform detailed simulations that assess performance across the entire year, based not just on local weather but also on the position of the panel relative to your building and any local shading obstructions, by modelling the position of the collection plate.
  • For heat pumps, we can model the system through a range detail levels as required.
  • For larger developments, we can investigate the generation of DHW through CHP systems.

Energy Use, Energy Demand and Consumption

IES can assess proposed shading to fenestration is sufficient for the building site and orientation through model visuals providing feedback to guide design considerations.

We assess the building envelope in its entirety, including the impact from:

  • Site location (inc. ground temperature and elevation)
  • Building orientation
  • Building geometry – as per proposed design, taken directly from CAD files
  • Construction materials – considering not just the R values, solar heat gain/loss performance and thermal mass effects
    • External walls – based on generic or supplier data
    • Fenestration – different frame and glazing combinations for the proposed windows
    • Roof Assembly – including flat roofs or complex ceilings not covered by SANS 204
  • Ventilation (Natural, Mechanical, Mixed Mode, Hybrid)
  • HVAC systems
More Information

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