How does BASIX apply to a secondary dwelling?

State: NSW

Explainer – How does BASIX apply to a secondary dwelling, including granny flats

A secondary dwelling is defined under NSW planning legislation as a self-contained dwelling that:

(a) is established in conjunction with another dwelling (the principal dwelling), and
(b) is on the same lot of land as the principal dwelling, and
(c)  is located within, or is attached to, or is separate from, the principal dwelling.

 It is important to note that if there is an existing principal dwelling on the site, and you are building a new granny flat, or converting non-habitable space (for example, a garage or a shed) into a new dwelling, you must assess the new development as a new single dwelling house. This is not considered alterations and additions to an existing BASIX building.

In these cases, the BASIX standards for new dwellings apply, and not the standards for alterations and additions. (refer to BASIX atricle on Alts & Adds FAQ).

The Secondary Dwelling (Granny Flat or Bedsitter) Help Note provides further guidance.
  

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