The whole thing is not very good.
How could one be an expert after 5 days of a course?
I spent weeks working with u-values, many years ago, and there is a bit in it.
Ok they use software.
The real joke is no one checks on the work of the builder.
I have encountered houses which were passed by engineers for loans, and had no insulation in the attic. There should be at least 12 inches there i think.
However the idea is good
It is way too expensive for a ber cert at present, 300 seems to be the price they charge, my feeling would be it should cost no more than 100.
Sorry ber guys, a 5 day course just is not good enough.
as regards the electrical controls is the heating system ,no one checks to see if they are even wired up.