Pre-Construction Dilapidation Reports: Timing and Process

A dilapidation reportis only valuable if it is completed before the adjacent construction activity disturbs the ground, creates vibration, or otherwise affects your property. The pre-construction report establishes the baseline — and timing is everything.

This page focuses exclusively on the timing, triggers, and process for obtaining a pre-construction dilapidation report in Adelaide. If you are looking for what happens after the construction is finished, see our separate guide on post-construction dilapidation reports.

When Should You Book a Pre-Construction Dilapidation Report?

The ideal window is two to four weeks before any ground-disturbing activity is scheduled to begin on the neighbouring site. This timing achieves three objectives:

1. Close enough to capture current conditions:The property's state is recorded as near as possible to the start of work, minimising the gap during which unrelated changes could occur.
2. Early enough to allow report preparation: The surveyor needs time after the inspection (typically five to ten business days) to compile the written report with annotated photographs.
3. Sufficient time for distribution: If the report is a council condition, copies must be provided to all affected parties (property owners, the developer, and the council) before work commences.

Timing Relative to the Development Approval (DA)

In Adelaide, when a council imposes a dilapidation report as a condition of the DA, the condition typically reads something like: “Prior to the commencement of any site works, a dilapidation report shall be prepared for all adjoining properties.” This means the report must be completed and distributed before any physical activity occurs on the site, including site clearing, temporary fencing installation, and demolition of existing structures.

For property owners (not the developer), the trigger is usually learning that construction is about to begin nearby. This might come through a council notification letter, a conversation with your neighbour, seeing a DA notice posted on the adjacent site, or noticing site preparation activity. The moment you become aware of impending construction is the moment to arrange your report.

What Triggers the Need for a Pre-Construction Dilapidation Report?

Not every construction project next door warrants a dilapidation report. The following activities are the primary triggers in South Australia:

Excavation Near Your Boundary

Any excavation that falls within the “zone of influence” of your property's footings creates a risk of ground movement, settlement, or lateral displacement. In practical terms, if the neighbouring excavation is within a 45-degree angle drawn downward from the base of your footings, there is a meaningful risk. Deep basement excavations for multi-storey apartments, which are increasingly common in Adelaide's inner suburbs, almost always trigger this requirement.

Demolition of an Adjacent Structure

Demolition generates significant ground vibration, airborne dust, and debris. When the structure being demolished shares a party wall with your building (common in terraced housing) or sits within a few metres of your boundary, a dilapidation report is essential. The vibration from mechanical demolition can propagate through the ground and cause cracking in masonry walls, dislodge roof tiles, and disturb plumbing connections.

Pile Driving or Heavy Foundation Work

Driven piles, bored piers, and dynamic compaction create intense ground vibrations that can travel considerable distances. Properties within 50 to 100 metres of pile-driving operations should be included in a dilapidation survey, depending on soil conditions. Adelaide's varied geology — from the sandy soils of the western suburbs to the reactive clays in the foothills — means the impact zone varies substantially across the metropolitan area.

Large-Scale Earthworks or Grading

Bulk earthworks involving the movement of significant volumes of soil can alter drainage patterns, change groundwater levels, and remove lateral support from neighbouring land. This is particularly relevant for hillside developments in suburbs like Stirling, Crafers, or the Adelaide Hills, where slope stability is a pre-existing concern.

Heritage or Older Buildings

If your property is heritage-listed, constructed before 1950, or built with unreinforced masonry, lime mortar, or stone, it is inherently more vulnerable to vibration and ground movement. These buildings have less structural redundancy than modern construction. A pre-construction dilapidation report is strongly recommended even if the adjacent project is relatively modest.

How SA Councils Handle Dilapidation Report Conditions

When a development application is assessed by a South Australian council (or the State Commission Assessment Panel for larger projects), the planning authority considers the potential impact on adjoining properties. If the proposed development involves any of the triggers described above, the authority can impose a condition requiring a dilapidation report.

The condition is binding on the developer. They cannot lawfully commence work until the condition is satisfied. In practice, this means the developer must engage a qualified surveyor, arrange access to the neighbouring properties, and provide copies of the completed report to all relevant parties before any site activity begins.

Different Adelaide councils have slightly different standard wording for these conditions, but the substance is consistent. The City of Adelaide, City of Norwood Payneham & St Peters, City of Charles Sturt, City of Unley, and City of Burnside all routinely impose dilapidation report conditions on boundary-adjacent developments.

If you believe a neighbouring development should have a dilapidation report condition but does not, you can raise this with the council during the public notification period or contact the council's planning department directly. Councils have the discretion to add conditions even after the initial assessment, particularly if new information about site risks comes to light.

Typical Timeline for a Pre-Construction Dilapidation Report

Understanding the timeline helps you plan and avoids last-minute scrambles:

Total elapsed time from first contact to a fully distributed report is typically two to three weeks. This is why booking two to four weeks before construction starts is the recommended approach.

The Relationship Between Pre and Post Construction Reports

A pre-construction dilapidation report is only one half of the process. To have a complete evidentiary record, a matching post-construction report should be prepared after the adjacent work is finished. The post-construction report follows the identical methodology but its purpose is comparison: the surveyor re-inspects every element documented in the original report and identifies any changes, new damage, or worsening of pre-existing conditions.

Together, the two reports form a pair that provides compelling evidence of cause and effect. Without the pre-construction baseline, it is extraordinarily difficult to prove that damage was caused by the adjacent construction rather than by normal aging, weather, or other factors.

Ideally, the same surveyor should conduct both the pre and post inspections for consistency. This also strengthens the evidence because a single surveyor can directly attest to the comparison. Our post-construction dilapidation report guide explains this process in detail.

Tips for Property Owners Preparing for the Inspection

• Provide access to all areas: Move furniture away from walls, clear stored items from garages and sheds, and ensure the surveyor can access the roof space, subfloor (if applicable), and all external areas including side passages.
• Note any existing concerns: If you are already aware of cracks, sticking doors, damp patches, or drainage issues, point these out to the surveyor. They will document them regardless, but your context can help.
• Keep a copy of the DA: If possible, have the development approval or council notification letter available. This helps the surveyor understand the scope of the adjacent project and focus their inspection accordingly.
• Be present during the inspection: While not strictly necessary, being home during the inspection allows you to point out areas of concern and ask questions about the process.