Regarding regulation compliance on restoration of house after extensive burn damage: to what extent to energy compliance regulations come into play?

My dad is a loss adjuster, currently investigating a building for insurance claim purposes. We're in South Africa, and we have these fairly new building regulations (SANS10400-XA) regarding energy compliance, which is a big thing here. For a building to be classified as deeming to satisfy regulations, the fenestration has to be less than 15% of the building envelope. If the fenestration exceeds this percentage, measures have to be taken to ensure compliance, including window shading, insulation, heat pumps instead of geysers (boilers), what have you.

Now, the client is adamant that his windows need NEW, specifically extremely expensive louvres, in order to comply with these regulations. The house itself is fairly old, and didn't have this shading in place, because as an existing building it is exempt from the regulations. My dad's point of view is that these regulations are only applicable to new buildings, and that restoration only has to restore the building to its previous state.

Any viable advice for me? There's quite a lot of money involved, so it's a big point of contention.

submitted by /u/lnk_Eyes
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