This is a low cost and fast method for energy compliance, in comparison with the Performance Solution. The Deemed to Satisfy (DTS) report provides a list of minimum prescriptive insulation values. It also includes the minimum thermal performance requirements for the glazing.
DTS compliance is fast (we can do it in a single day), low cost, and simple. There are two Deemed to Satisfy methods to obtain compliance with the BCA energy efficiency requirements:
- NatHERS Star Rating: This method uses a simple 2D model and rates the building energy requirements on the scale of 0-10 star bands.
- Elemental Provisions: This method doesn’t consider the whole house design and the trade-off between wall/roof/floor and glazing, it can be very expensive to implement in some instances. Also, this a very rigid method for energy compliance as it requirements are a must-do. We recommend this option for small and simple buildings with small glazing area.