A dilapidation report is only as useful as its timing. The inspection must take place before any construction activity begins on the neighbouring site -- including demolition, site clearing, and earthworks. Once ground disturbance starts, it becomes impossible to establish a reliable baseline.
Ideally the report should be completed no more than four weeks before works commence. This keeps the record current while allowing enough lead time for the surveyor to schedule the inspection and deliver the final document. If construction is delayed significantly, a top-up inspection may be warranted to capture any changes in the interim.
Coordinating with all parties early is important. Builders should be notified of the inspection so they understand the baseline has been established. Neighbouring property owners should be given reasonable notice and access. In Perth, most surveyors can turn around a standard residential report within five to ten business days of the site visit.