Post-Construction Dilapidation Reports: Comparing Before and After
Construction is finished — now it is time to identify whether your property has been affected. Here is how the comparison process works and what to do if damage is found.
When to Book a Post-Construction Dilapidation Report
A post-construction dilapidation report should be booked once the adjacent construction works have been substantially completed. This means the major activities that posed the highest risk to your property — excavation, piling, demolition and heavy machinery operation — are finished.
The recommended window is two to six weeks after construction completion. This allows time for any construction-induced ground settlement to manifest while still being close enough to the works to establish a clear causal link. If the project involved dewatering, it is advisable to wait until groundwater levels have returned to normal before inspecting.
For council-mandated reports, check the development approval conditions. Many councils require the post-construction report to be submitted within a specified timeframe — commonly 30 to 60 days after completion of works. Meeting this deadline is important for both compliance and your claim position.
How the Before and After Comparison Works
The post-construction inspection follows the same systematic methodology as the pre-construction report. The surveyor revisits every area documented in the original report, rephotographs the same elements from the same vantage points, and takes new measurements of any cracks or defects previously recorded.
- 1
Side-by-Side Photo Comparison
The surveyor places pre-construction and post-construction photographs of the same location side by side. Any differences — new cracks, widened cracks, displacement, staining, structural movement — are immediately apparent and documented with detailed annotations.
- 2
Measurement Comparison
Crack widths recorded during the pre-construction inspection are remeasured. Any increase in width, length or number of cracks is quantified in millimetres. Level surveys and plumb-line checks are repeated where applicable to detect any structural movement.
- 3
New Damage Identification
Any defects that were not present in the pre-construction report are flagged as new damage. The surveyor provides an objective assessment of whether the nature and location of the damage is consistent with the type of construction activity that occurred on the adjacent site.
- 4
Summary and Recommendations
The report concludes with a summary of all identified changes, a professional opinion on their likely cause, and recommendations for next steps — whether that involves direct negotiation with the builder, engaging an insurer, or pursuing formal dispute resolution.
What Happens If Damage Is Found
Discovering new damage after construction is stressful, but having a professional pre and post construction report pair gives you a clear path forward. Here is the typical sequence of events when damage is identified in Perth.
Notification
The first step is to formally notify the builder or developer of the damage, providing a copy of the post-construction report with the pre-construction report for reference. Written notification by email or registered post creates a clear record.
Negotiation
Many disputes are resolved through direct negotiation. The builder may agree to repair the damage, cover repair costs, or offer a settlement. Having clear photographic evidence makes negotiation far more productive — it removes the guesswork.
Insurance Claim
If negotiation fails, you may be able to claim against the builder's public liability insurance, or under your own home insurance policy depending on the circumstances. Insurers will require evidence of the property's condition before and after the works — exactly what dilapidation reports provide.
Evidence Requirements for Damage Claims
Whether you are negotiating directly with a builder, filing an insurance claim or pursuing formal dispute resolution, the strength of your evidence determines the outcome. A professionally prepared dilapidation report pair provides the following evidentiary elements.
- ▶
Time-stamped photography: Every photograph carries metadata confirming the date, time and location of capture. This establishes an irrefutable timeline.
- ▶
Calibrated measurements: Crack widths measured with professional gauges in millimetres, level surveys showing floor or wall deflection, and plumb-line readings documenting any structural lean.
- ▶
Independent professional opinion: The surveyor's written assessment of whether the observed changes are consistent with the type of construction activity that occurred.
- ▶
Systematic methodology: Courts and insurers place greater weight on reports that follow a recognised methodology, cover the entire property systematically, and are prepared by qualified professionals.
Dispute Resolution Options in Western Australia
If direct negotiation with the builder does not resolve the matter, Perth property owners have several formal dispute resolution pathways available.
State Administrative Tribunal (SAT)
SAT handles building disputes in WA, including property damage claims arising from construction activity. The process is less formal and less costly than court action. Dilapidation reports are routinely accepted as evidence and can be decisive in the tribunal's determination.
Insurance Claims
The builder's public liability insurer may cover repair costs if the damage can be attributed to their works. Your own home and contents insurer may also provide coverage in certain circumstances. Both will require documentary evidence — your dilapidation reports form the foundation of the claim.
Legal Action
For significant damage, engaging a construction lawyer may be warranted. Claims can be pursued through the Magistrates Court (up to $75,000) or the District Court for larger amounts. Your dilapidation reports serve as key evidence, often supported by structural engineer assessments.
Mediation
Many disputes are resolved through independent mediation before reaching a tribunal or court. Having clear before-and-after evidence makes mediation more productive, as both parties can see the documented reality rather than debating opinions.
Want to understand who pays for dilapidation reports when damage is found? Our guide explains the cost responsibilities for property owners, builders and developers.
Post-Construction Report FAQs
Construction Finished? Document the Evidence Now
The longer you wait after construction ends, the harder it becomes to attribute damage. We connect Perth property owners with qualified surveyors who complete thorough post-construction comparison reports.