I was wondering if anyone has any spreadsheets / checklists of costs one needs to consider when building a duplex. Any reference material at all in relation to duplex development would also be helpful.
I have done a few different duplex projects and they can range (these days) from a minimum of $700 to $900 thousand.
Could be more if you are building in a posh area and you have to put in more upper market features. For example swimming pool costs would be separate or granny flat at the back and so forth..