This can be influenced by the approval process required for your new home. The Complying Development Certificate (CDC) can take 2 to 3 weeks for approval, while a Development Approval (DA) can take 2 to 4 months, depending on the council. The total build time is, on average, 10 to 13 months. Each project has a “project schedule” prepared and given to the owner at the beginning of the project.