There is no fixed minimum block size — eligibility depends on local council zoning and planning requirements.

As a general guideline:

Urban and suburban blocks with R2 residential zoning are commonly eligible

Rural blocks and multi-dwelling properties may require additional setbacks or town planning

Your block's suitability will be confirmed during the Prelim and Site Assessment phases. These processes check zoning, overlays, setbacks, and space requirements for crane and truck access. Even small or narrow blocks may be eligible with the correct planning path and site conditions.