On the off chance that the expansion and inward works are under half, at that point a two rating strategy can be utilized. This technique empowers us to play out a 6-star energy rating on the current dwelling first with all the current conditions included, with a normal consequence of 1.5-3.5 stars can be normal.
At that point, we play out another 6-star vitality rating with the proposed expansion also.
The proposed volume should be 6 stars, yet this arrives at the midpoint of out with the current dwelling results.
This strategy is regularly more financially savvy as you just need to focus on the proposed augmentation and the current rooftop hole.