The fixed-price quote is broken. Here's what Australian builders won't tell you about the number on your estimate.

An investigation into how a growing share of residential builders quote a lump sum to win the job, then walk it up 20-40% mid-build using provisional sums, latent-conditions clauses, and quietly-rewritten variations. After Porter Davis and Metricon, homeowners thought the industry would clean itself up. The contracts haven't changed.