How much does a BASIX Certificate cost in 2026?
How much does a BASIX Certificate cost in 2025?"
Here is a break down of the government and consultant fees.
Spot the differences.
Part of the job of a Thermal Performance Assessor is playing ’Spot the difference’ with a design.
The specification needs to fit!
Recently I came across a NatHERS rating provided to a builder who was asking for some explanation.
The walls in his construction were on plan as 90mm.
His assessor had noted that he required R3.5 polystyrene insulation!
This product is 180mm thick!
Construction knowledge goes a long way to providing results that work in the real world. Experience helps provide assessments that a builder can actually build.
For the record, R2.7 is the maximum in a glass fibre batt that will fit in a 90mm wall. Thicker solutions and higher R-values can be specified, but this needs to be communicated with the architect and designed to suit.
From BersPro to BASIX
Inputting data into the BASIX portal can be a challenge.
I built a spreadsheet to interpret the building element details summary quickly for entry into the planning portal.
Diversion in place.
The way the multi unit or dual occupancy BASIX is presented leads a lot of first time readers to believe a divertor is required. It is actually saying if one is required, it should be on the plans and on the BASIX itself. It is only the case if the box next to the WELS star ratings of fittings is selected.