How can I estimate the cost to build the house in Auckland? Answer: According to the department of Building & Housing, the average cost-per-square-meter to build a home on site is between $1648 & $1810. Now wipe those numbers from your mind.ttp://www.dbh.govt.nz/bofficials-estimated-building-costs. So if you go the site-built route, we suggest that you start with a dollar amount that you’re willing to spend. Interview at least three builders and check their LBP licenses and references and look at their work.