https://www.dezeen.com/2017/05/20/perimeter-house-encloses-private-courtyard-architecture-residential-houses-melbourne-australia/

A proposal for an 8 meter rear extension to a detached property above.

There is currently a scheme to allow larger single storey extensions to residential properties. Its not a full planning application and doesn’t take as long to go through. In fact it takes just 42 days and only requires the minimum of information.

This scheme only applies to larger single-storey rear extensions which are permitted until 30 May 2019. This means that extensions of between four and eight meters for detached houses and between three and six meters for all other houses, can go through this process.