Yes — Expandify homes are commonly installed behind existing primary dwellings on standard residential blocks.

This is often done for:

Granny flats for family or tenants

Secondary dwellings for rental income

Home office or studio spaces

As long as your block meets the zoning, setback, and access requirements, there is no issue with placing the home behind your existing house. This will be assessed during the Site Assessment and verified against council planning rules during the Prelim stage.