What is the maximum size I can build my house? firstname.lastname@example.orgT06:32:20+00:00 This will depend on the size of your lot. Typically councils have a restriction on the size of the house as a percentage of the lot. Likewise, this will be the case for CDC, with the maximum internal area being 400m2 for lots 1000m2 or over. Previous Can I remove trees on my site? Next Can I have a basement?