Custom Home Builders Sydney considers duplexes the most economical type of construction – a duplex costs 25% less than a house in the same area. In addition, if the duplex residents are part of the family, you can share maintenance expenses such as plumbing and electrical installation. They will, of course, be counted according to the family’s consumption; thus, it is essential to choose the heating source well. For a couple just starting, having family nearby is a real help. Therefore, choosing a duplex is the most convenient solution.