Depending on your project, there are three BASIX online assessment tools:

• new dwellings – single dwelling houses
• new dwellings – multi-dwellings
• alterations and additions

There is also an administration tool for certifiers and planners.

New dwellings – single dwelling houses

This tool allows registered users to generate a BASIX certificate for a new single dwelling - typically class 1 building in the National Construction Code.

In most cases this will be a detached dwelling house, but can also include:

• one dwelling in a conjoined or semi-detached house where the dwelling is on a separate land title with no common property or shared services.
• one of several similar dwelling houses, each of which is on a separate land parcel, such as in a new subdivision. The 'duplicate' function in the project portfolio allows individual certificates to be quickly generated for each similar dwelling house.
• a change of use (conversion) from a non-residential building, or from a structure that is not approved to be used as a dwelling, to a dwelling house. In this situation, advice may need to be obtained from the BASIX help desk as to how project details are entered in the tool, and whether an alternative assessment is required for any part of the existing structure
• a secondary dwelling that involves converting non-habitable space (such as a garage) or new construction outside the footprint of the existing (primary) dwelling.

View more information on using BASIX for secondary dwellings.

New dwellings – multi-dwellings

This tool allows registered users to generate a BASIX certificate if the project involves more than one dwelling, or the development includes common property or services shared with other new or existing development. Typical project types include:

• a residential flat building - generally three or more units to be strata titled (typically class 2 buildings in the National Construction Code)
• two or more terrace houses, row houses or semi-detached houses, with or without common property or shared services
• two or more detached or attached houses, including villa units and dual occupancy dwellings on one parcel of land with common property and/or shared services
• several single dwellings on land subject to subdivision to create new separate lots.

For more information on using BASIX for subdivision projects and large, multi-unit developments, refer to the help note on When is more than one BASIX certificate required?

Note that the DIY method for thermal comfort assessment cannot be used for multiple dwellings. An accredited assessor is required to complete the thermal comfort section using software accredited by the Nationwide House Energy Rating Scheme (NatHERS).

Alterations and additions, and pools and spas

This tool allows registered users to generate BASIX certificates for the following purposes:

• to alter, enlarge or extend an existing BASIX-affected building
• for a swimming pool or spa, or combination of swimming pools and spas, that serve only one dwelling.

The tool can also be used to generate a BASIX certificate for a secondary dwelling where that dwelling is created by converting existing habitable space within the primary dwelling. View more information on using BASIX for secondary dwellings.

Administration tool

This tool allows certifiers and council planners to search, access and check already generated BASIX certificates. Accredited certifiers can also generate BASIX completion receipts. The administration tool is not available to general users.