What is the minimum block size required to build a granny flat?
Written by Clayton Bielby
Updated at April 5th, 2025
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There is no fixed rule across Australia, but most councils require:
Minimum 450sqm block size for a CDC approval in NSW and VIC
Larger lot sizes or wider frontage in regional and rural areas
Sufficient setbacks, crane access, and clear boundaries
Your eligibility is confirmed during the Prelim. Even small blocks may qualify depending on layout, zoning, and access conditions.