Most homeowners planning an extension call a builder first. But before a builder can price the work or start construction, there is a substantial pre-build phase: concept design, working drawings, engineering, energy assessment, and permits. This guide explains the sequence from first designer meeting to builder appointment.

Most Melbourne homeowners start their extension by calling a builder. Here's why that leads to quotes that are all over the place - and what the design and documentation process actually involves before any work begins.