Project waste is often visible on site, but it is usually created earlier. By the time surplus pipe, damaged cable tray, redundant formwork, off-cut plate, rejected concrete, or unused insulation reaches a skip, the project has already lost money.

Biodiversity Net Gain is no longer a late-stage ecology exercise for many capital projects. For major infrastructure, it can affect the land take, the consenting strategy, the design envelope, the construction program, the cost plan, and the operating model long after handover.

Project success should not end at handover. This article examines how long-term sustainability performance can be tested through community outcomes, workforce and supplier capability, environmental restoration, biodiversity, asset efficiency, and residual liabilities years after the project team has left.