Footpaths etc are not included in block size. Corner blocks tend to be bigger so that's a bonus, but obviously the upkeep of the front yard and side is more work, as is the landscaping cost.

Site costs will depend on where you buy land and what the soil rating is like etc.

Do you plan to use a private builder or volume builder? Both present different challenges... We owner built our house - don't do that! Lol it was painful.

Make sure you include landscaping and a driveway in your budget - they're not cheap and not included by builders. Fly screens on windows and doors are also not included so keep that in mind.