Hi All
I am registered residential builders involves building ,ulti unit projects across Melbourne.To built a multi- unit project first of all you will need to see an architect /drafting designer to come up with the set of Town planning drawings to get approved by relevant local council authorities,then from here you can look for a builder (I recommend ask friends and relatives and get recommendations)who is an expert in the field and get 2/3 written fixes price contract with all details and specifications.making sure all costs are included beside the actual construction cost.For example,storm water,driveway,landscaping and all services to the property like electricity ,gas,phone,water,ect.
Builder charges are varies depending on the size of the units ,normally the bigger the cheaper will be.At the moments as year 2011 we are building around $11,500.00 per building square for medium quality project and ofcourse it will cost more if you wants very high quality fixing and fixtures.
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Good luck all
Michael Imani