Hi My house was orginally designs for 5 star rating on the plans. However it only required R2.5 and R1.5 for insulation etc.
During the build i increase in the ceiling batts to R3.5 the wall batts to R2, and I added sarking under the cooler bonf roof.
In additional to that I added 20000 litres water tank and 1kwatt solar panel system.
Does anyone know roughly how much impact this would have had in improving my star rating of the house???