In new estates the average block size in Victoria is 448m2. Typically this lot size refers to a 14m x 32m lot. The width and depth of the lot will determine the type of house you can build. Ensure you check the width, depth and slope of the block against the dimensions of the house design you would like to build.
Do you want a big garden/backyard or are you looking for something with a smaller footprint and less maintenance? Are you near parks? (this could impact how big your backyard needs to be). Do you want a double garage? Typically you will need a lot with a minimum width frontage of 12.5m to do this.
Ensure you check the dimensions of the block for setback requirements, easements or other conditions that will limit where on the block of land your house can be positioned.