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Sans 10400-XA Online

Manage and submit your projects for SANS 10400-XA Rational Assessment

01Choose your Path

Deemed-to-satisfy or rational assessment? Learn about South Africa's new energy regulations.

What is Rational Assessment?

02Quick Quote

Simply enter your building's classification and GFA and get a quote on an assessment.

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03Start an Assessment

Ready to go? Manage your projects online for free and with ease and submit for assessment when ready.

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What is Rational Assessment?

01Meeting Energy Regulations

The architect produces the building design concept in accordance with the requirements of the client.

To meet the new energy regulations, either the prescriptive deemed-to-satisfy path to compliance, or the performance based rational assessment must be followed.



Calculations are done for the fenestration.

If the first concept design does not comply, the following may be implemented to bring the design to compliance:

  • reduce glazing ratio
  • specify double glazing and performance glass
  • implement horizontal shading devices

Rational Assessment


A 3D energy model is built, with details of actual location, fabric, operation and systems embedded.


Insulation levels must be met for the roof, prescribed by the climate zone.


An hourly simulation is run for the building using certified thermal calculation software.

Rational glazing and insulation properties are chosen to balance cost and performance. There is no minimum glazing or insulation requirement.


Shading provided by surrounding buildings may not be accounted for, and space use and the efficiency of energy systems may not be considered to show compliance.


Annual energy and peak power use are quantified, accounting for all the building's energy uses.

These are reported in detail, and a building energy performance summary is generated.


Once the prescriptive boxes have been ticked, forms may be signed and submitted to council alongside building plans.


If the building's annual energy use and peak power are less than the allowances in the XA regulation, the building passes the rational assessment.

If the energy use is shown to exceed the allowance, the most cost effective energy conservation measures may be advised to achieve the required performance.

Forms are signed, and the report and summary page are submitted to council alongside building plans.

Quick Quote

R 0 .00

Excludes Vat * Includes 15% discount of R * Includes Performance Modelling fee of R

Getting started


The use of SOLID XA for the online management of your SANS 10400 XA Rational Assessments is free and without obligation.

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The classification under which the building will be submitted to council.

Enter the gross floor area of the building excluding garages and storage areas.

Cost of completing the rational assessment path to compliance through simulation. Excludes VAT.

Payment terms
100% of XA rational assessment, and 50% of Performance modelling (optional), due on acceptance of quote.

Enter your email if you would like us to get in touch regarding your quote.

Enter the name of the project, development or building (appears on official quote).

Enter the name of the client (appears on official quote).

Include 2nd deliverable, performance modelling and simulation, performed by Solid Green Consulting. Learn more.