JSBC Consulting prepares dilapidation reports across Sydney and greater NSW — detailed, engineer-prepared condition surveys that record the state of neighbouring properties and public infrastructure before your construction, demolition or excavation works begin. Because we are qualified structural engineers, our reports directly satisfy the common Development Application (DA) consent condition that a dilapidation survey be prepared by a suitably qualified engineer.

When is a dilapidation report required?

In Sydney, a dilapidation report is most often required as a condition of Development Application (DA) consent. Councils across the eastern suburbs, inner west, North Sydney and beyond routinely make a pre-construction dilapidation survey of adjoining properties a standard condition of approval — particularly where the works involve:

• Basement excavation, underground car parks or deep excavation (commonly beyond ~1.5 m deep)
• Retaining walls, shoring or underpinning near a boundary
• Demolition or works generating significant vibration near neighbouring dwellings
• Sites on a slope, above or below a neighbouring property
• Works close to council infrastructure such as roads, kerbs and drainage

If your consent conditions call for a dilapidation report “prepared by a suitably qualified engineer,” JSBC Consulting satisfies that requirement directly.

Why choose an engineer-prepared report?

Many dilapidation reports are prepared by general building inspectors. JSBC Consulting is a firm of registered structural and façade engineers, which means our reports carry the weight your consent condition — and any future dispute — demands. We not only document existing cracks and defects, we understand the structural risk your excavation poses to adjoining properties, and we can advise on shoring, underpinning and rectification if issues arise. Should a dispute over alleged damage occur, an engineer-prepared, methodical baseline record is far more defensible.

What our dilapidation reports include

• A methodical, room-by-room, photographic record of each adjoining property and relevant public infrastructure
• Clear notation of existing cracks, movement, defects and finishes
• Date-stamped, high-resolution imagery and a structured index for easy reference
• A professional report suitable for lodgement with council and for use in any future dispute
• Optional post-construction comparison survey once works are complete

Areas we serve

We prepare dilapidation reports across the Sydney metropolitan area — including the Eastern Suburbs, Inner West, North Shore, Northern Beaches, Sutherland Shire, Hills District, Parramatta and Greater Western Sydney — and throughout New South Wales. Our office is in Burwood, centrally located for jobs across Sydney.

Your development application is approved — congratulations. Now your conditions of consent say a structural engineer must prepare a pre-construction and post-construction dilapidation report before you can pull a Construction Certificate. Here is exactly what that means, why it protects you, and how to get it signed off by your certifier without delays.

If you have landed here after searching “dilapidation report NSW,” “who can do a dilapidation report,” or “pre-construction condition survey for my DA,” you are in the right place. JSBC Consulting is a Sydney-based structural and façade engineering consultancy and we prepare these reports as a routine part of our work. This guide explains the whole process so you can move from DA approval to a clean Construction Certificate with confidence.

What is a dilapidation report?

A dilapidation report — also called a condition survey — is a dated, photographic and written record of the existing condition of the properties, structures and public infrastructure surrounding your site. It is taken twice:

• Before any works begin (the pre-construction report), and
• After the works finish (the post-construction report).

The pre-construction report establishes an agreed baseline of pre-existing cracks, movement and damage. The post-construction report then compares against that baseline to determine, fairly and on evidence, whether your works caused any new damage.

Why you actually want one (it protects you)

Most owners and builders treat the dilapidation report as a box to tick for the certifier. It is far more than that. A properly prepared report:

• Establishes a baseline of every pre-existing defect on neighbouring buildings, fences, retaining walls, footpaths, kerbs and roads before you touch the site.
• Protects you against unfounded damage claims. When a neighbour points at a crack and says your excavation caused it, a dated pre-construction photo showing that crack already existed is the difference between a dismissed claim and an expensive dispute.
• Gives a fair, evidence-based way to assess genuine damage if it does occur, so the right party pays for the right repair.
• Satisfies your conditions of consent so the certifier can issue your Construction Certificate and, later, your Occupation Certificate.

The cost of a dilapidation report is small. The cost of a contested damage claim with no baseline evidence is not. This is risk insurance you can hold in your hand.

Who is allowed to prepare it?

This is where many projects trip up. Conditions of consent in NSW almost always require the report to be prepared by a qualified structural engineering firm — not a builder, not a building inspector, not the owner. The consent will typically use the words “Engineer” or “Practising Structural Engineer.” If the report is not authored and signed off by a suitably qualified structural engineer, your certifier can reject it.

JSBC Consulting prepares qualified structural engineering dilapidation reports across Sydney, including the Burwood, Inner West and metropolitan council areas.

When does each report have to be done?

The single most important sentence in this article: the pre-construction dilapidation report must be completed and (in most cases) issued to the neighbouring owners before any works commence. Missing the pre-works survey cannot be fixed later. Once the excavator is on site, the original condition is gone.

The “Zone of Influence” — how far beyond your boundary do you have to survey?

This is the question that confuses almost everyone, and getting it wrong is a common reason certifiers send reports back.

You do not only survey the buildings immediately next door. Your conditions of consent require you to survey every property, structure and piece of public infrastructure that falls within the zone of influence of your excavation. The zone of influence is the area of ground around your excavation that could realistically be affected by the works.

How the zone of influence is defined on a real project

The zone of influence is defined by the project geotechnical engineer in their geotechnical investigation report, and it is specific to your excavation depth and ground conditions. As a worked example, here is how it was defined for a real mixed-use development in Burwood, New South Wales:

The geotechnical report defined the zone of influence in these terms:

• Detailed dilapidation surveys must be carried out prior to demolition and excavation on the neighbouring buildings, buried services and infrastructure (including roadways and footpaths) that fall within the zone of influence of the excavation.
• The zone of influence is defined as those areas that are above a line drawn upwards at 1 Vertical (V) to 2 Horizontal (H) from the base of the excavation.
• The dilapidation reports must provide a record of existing conditions prior to commencement of the work.

What the 1V : 2H line means in practice

The “1 Vertical to 2 Horizontal” rule is a simple geometric projection. Starting at the base of your bulk excavation, you draw a line that rises one metre vertically for every two metres horizontally, projecting outward and upward toward the surface. Anything that sits above that line — any building, footing, buried service, footpath, kerb or roadway — is inside the zone of influence and must be surveyed.

The practical consequence: the deeper your excavation, the wider the zone of influence becomes. For every metre of excavation depth, the zone extends a further two metres horizontally beyond the base of the excavation at the surface.

A quick worked example:

• If your bulk excavation is 5 m deep, the 1V:2H line reaches roughly 10 m horizontally out from the base of the excavation at ground level.
• If your excavation is 8 m deep, it reaches roughly 16 m horizontally.

So a deep basement on a tight site can pull neighbouring properties two or three lots away into the zone of influence. This is why you should never assume “just the immediate neighbours” — always check the geotechnical report’s definition against your excavation depth and measure the projection from the base of excavation.

Important: Always use the zone of influence defined in your project’s geotechnical report. The 1V:2H ratio above is the definition adopted for the Burwood example. Other sites may adopt a different ratio depending on soil type, rock head, groundwater etc, so the geotechnical engineer’s definition governs.

Survey the whole building, not just the part inside the zone

A frequently missed condition: where only part of a building falls within the zone of influence, the report must still cover the whole building. Do not survey only the portion near the works. Certifiers check this.

What gets inspected and recorded

A thorough dilapidation report covers far more than the neighbour’s lounge-room wall. The scope typically includes:

Properties and assets

• All buildings and structures on land adjoining the site, plus any building partly within the zone of influence (whole building).
• Exterior and interior of adjoining buildings where access is granted.
• Public infrastructure: footpaths, kerbs and gutters, driveway crossovers and laybacks, kerb ramps, road carriageway and street drainage.
• Street trees and plantings, parking and traffic signs, street lighting and other street furniture.
• Boundary structures: dividing fences, retaining walls and party walls.

Condition detail for each element

• Cracking — location, length, width (measured with a crack gauge), orientation and pattern.
• Movement and distortion — leaning, bulging, settlement, out-of-plumb walls, uneven floors.
• Water damage, dampness, efflorescence, spalling and rust staining.
• Finishes — render, paint, tiling, plaster, brick and mortar condition.
• Pre-existing repairs and prior damage.
• Pavement and road defects — cracks, depressions, trip hazards and existing patching.

Photographic standard

• Date-stamped, high-resolution colour photographs, with a scale or ruler against cracks where practical.
• A wide context shot of each elevation, then close-ups of each defect.
• Consistent, logical photo numbering keyed to a location plan and the written notes.
• Every adjoining elevation captured even where no defect is visible (recorded as “no visible defect” or “existing conditions”).

Getting access to the neighbours

You cannot survey a building you cannot get into, and neighbours are not always cooperative. The conditions of consent anticipate this:

• Write to each adjoining owner early, explaining the purpose of the survey and requesting access.
• Keep a dated record of every request and response.
• If access is refused or not granted, document that all reasonable steps were taken, advise the owner of the reason for the report, and confirm this in writing to your certifier. Survey the exterior from publicly accessible vantage points and clearly note the limitation in the report.

Handled this way, a refused access does not hold up your Construction Certificate — but an undocumented gap will.

Balancing quality against cost — and getting it past the certifier first time

There is a genuine tension here. An overly thin report gets rejected by the certifier and leaves you exposed in a dispute. An over-engineered report costs more than it needs to. The sweet spot is a report that:

1. Addresses the exact conditions of your consent — quoted by condition number — so the certifier can tick each one off without interpretation.
2. Correctly applies the zone of influence from your geotechnical report, including any whole-building requirement.
3. Has a complete, indexed, dated photographic record that will stand up if a claim is ever made.
4. Documents distribution — confirming copies were issued to the certifier, Council, Planning Secretary and each adjoining owner as the consent requires.
5. Documents any no-access properties in writing.

A report that does these five things is both defensible and proportionate. It is the balance of quality versus cost that actually serves you: enough rigour to protect you legally and satisfy the certifier, without padding you do not need.

Report contents checklist

A compliant dilapidation report should include:

• Cover page — project, site address, consent number(s), report type (pre- or post-construction) and date.
• Author details — The structural engineering firm approving the report.
• Purpose and scope, and the consent condition(s) being addressed.
• Methodology — inspection dates, equipment, weather and any limitations or no-access items.
• Locality / site plan identifying each property and asset surveyed, and the zone of influence.
• Condition description for each property and element, cross-referenced to photos.
• Indexed, dated photographic record (Index of Photos table).
• Access correspondence appendix.
• Statement of baseline condition (pre) or comparison and damage findings (post).
• Distribution list confirming copies issued.

The post-construction report

The post-construction report is not a fresh survey — it is a deliberate re-shoot of the same properties, elements and viewpoints captured before works, so a true before-and-after comparison can be made. It must explicitly state whether, by comparison with the pre-construction report, any structural damage has occurred to adjoining buildings, infrastructure or roads, and where damage is found, whether it resulted from the development works. It is issued before any Occupation Certificate and distributed per the consent.

Do’s and don’ts at a glance

Talk to JSBC Consulting

If your conditions of consent require a pre-construction or post-construction dilapidation report, JSBC Consulting can prepare a structural engineering report that is mapped to your exact consent conditions, correctly applies your geotechnical zone of influence, and is built to satisfy your certifier first time — protecting you against future damage claims without unnecessary cost.

Get in touch to discuss your project and your conditions of consent.

This article is general guidance for developers, builders and owners in NSW. The conditions of your specific development consent and the definition of the zone of influence in your project’s geotechnical report always prevail. Always read your conditions in full.

Delivering a large-scale commercial, high-rise residential, or mixed-use development in New South Wales requires navigating some of the strictest regulatory and environmental conditions in the world. Developers and architects cannot afford the risk of disjointed design between the building’s skeleton and its skin.

JSBC Consulting solves this by providing integrated, Tier 1 engineering solutions across two specialized divisions: Structural Engineering and Facade Engineering.

Our principal engineers are registered Design Practitioners under the NSW DBP Act, meaning we deliver fully compliant, regulated designs for Class 2 residential buildings, commercial towers, health infrastructure, and complex deep excavations.

Here is an overview of our core engineering capabilities.

1. Structural Engineering Services
The structural integrity of a high-rise tower or deep basement is the foundation of a successful project. JSBC’s structural division specializes in building structures, delivering advanced analytical modeling and practical, buildable designs that optimize material use and manage complex load transfers.

Our core structural capabilities include:

• Advanced Structural Design: Comprehensive design for reinforced concrete, structural steel, and post-tensioned concrete systems.
• Subterranean & Foundation Engineering: Expert design of raft foundations, temporary shoring, and complex deep basement excavations (including managing Specialist Engineering Assessments for Sydney Water assets).
• Lateral & Dynamic Analysis: Advanced engineering to manage lateral wind loads and earthquake/seismic activity for high-rise structures.
• BIM & 3D Modeling: Utilizing advanced Revit and Building Information Modelling (BIM) for precise spatial coordination, clash detection, and technical CAD drafting.
• Inspections & Reporting: Providing dilapidation reports, structural assessment reports, and thorough site inspections during the construction phase.
• Compliance: Issuing mandatory DBP Act Design Compliance Declarations for Class 2 residential structures.

2. Façade Engineering Services
A building’s envelope is its primary defense against the elements. A poorly designed façade leads to water ingress, thermal inefficiency, and massive remediation liabilities. JSBC Consulting’s façade engineering division ensures high-performance, weather-tight building envelopes that meet stringent architectural visions.

With the NCC 2025 weatherproofing requirements (Part F1) coming into effect on May 1, 2026, early engagement with a façade engineer is more critical than ever.

Our core facade engineering capabilities include:

• Weatherproofing Certification: Engineering bespoke façade systems to meet the strict F3P1 (NCC 2022) and the upcoming
• Part F1 (NCC 2025) weatherproofing performance requirements.
• Contractor & Site Coordination: Reviewing façade contractor shop drawings, developing detailed installation method statements, and conducting on-site façade inspections.
• Forensic & Remedial: Providing forensic engineering investigations for existing building failures and developing remedial feasibility studies.

Partner With JSBC Consulting

Whether you are developing a 30-storey Class 2 residential precinct, a sprawling commercial center, or complex health infrastructure, your project requires precision engineering.

We operate across diverse markets, bringing Tier 1 project experience to every site. Contact the team at JSBC Consulting today to discuss how our structural and façade engineering divisions can add value, efficiency, and strict compliance to your next development.

For high-rise residential developers in Sydney, maximizing subterranean space for parking and plant equipment often requires deep basement excavations. However, when these excavations occur near critical underground infrastructure, navigating utility compliance becomes a major engineering hurdle.

If your deep excavation or shoring works fall within the “Zone of Influence” of critical Sydney Water infrastructure, standard approvals will not suffice. You will be legally required to submit a Specialist Engineering Assessment (SEA) before any construction certificate or work can commence.

JSBC Consulting provides comprehensive structural works engineering for complex high-rise basements. We work alongside Water Servicing Coordinators (WSC) and geotechnical experts to navigate the SEA process, ensuring your shoring and retention systems protect adjacent Sydney Water assets while keeping your project on schedule.

What is a Specialist Engineering Assessment (SEA)?

A Specialist Engineering Assessment (SEA) is a highly detailed, mandatory evaluation process mandated by Sydney Water. It is required when proposed building works fall “Out of Scope” (OOS) of the standard Building Over and Adjacent to Pipe Assets (BOA) guidelines.

The primary objective of an SEA is to scientifically prove that your construction activities—such as deep excavation, dewatering, piling, or crane loads—will not cause physical damage, restrict access, or induce long-term stress on Sydney Water’s critical infrastructure.

For the official policy, refer to Sydney Water’s Technical Guidelines: Building Over and Adjacent to Pipe Assets.

The “Zone of Influence” in Deep Basement Excavations

In high-rise construction, the greatest risk to underground utilities is not necessarily a direct strike, but rather ground movement.

When you excavate a deep multi-level basement, the surrounding soil naturally wants to relax or collapse into the void. This creates a Zone of Influence (ZOI)—a subterranean area where ground stresses are altered. If a Sydney Water asset (like a major sewer main) sits within this zone, the shifting soil can cause the pipe to crack, rupture, or lose structural integrity.

To mitigate this, JSBC Consulting designs robust shoring, anchoring, and basement retention systems that limit soil deflection to microscopic margins, satisfying the stringent criteria of the SEA.

Our Advanced BIM Workflow for Faster SEA Approvals

The key to a successful—and timely—SEA approval from Sydney Water is the accuracy and clarity of the structural technical drawings and reports. 

To ensure our SEA reports facilitate rapid turnarounds, JSBC Consulting utilizes an advanced Building Information Modeling (BIM) workflow to map the exact relationship between the bulk excavation and the critical assets:

1. Topographical Surface Modeling: We utilize the TIN (Triangulated Irregular Network) data from the land surveyor to generate a highly accurate existing surface model in Autodesk Civil 3D.
2. Revit Integration: This Civil 3D surface model is then shared and linked directly into our Revit structural model.
3. Utility Asset Mapping: We 3D model the existing and proposed sewer and water mains—based directly on the Sydney Water Coordinator’s design—into that exact same Revit environment.
4. Shoring & ZOI Visualization: Using these advanced BIM tools, we model the proposed shoring systems. Because the site, the shoring, and the Sydney Water assets are unified in one precise 3D model, we can instantly cut cross-sections anywhere on the site.

This workflow allows us to clearly and speedily demonstrate the exact Zone of Influence (ZOI) from the bulk excavation relative to Sydney Water’s assets. Providing this level of unquestionable, highly visual accuracy is a key input for our SEA reports, giving reviewing authorities the confidence they need to grant faster approvals.

JSBC Consulting: Expertise in Deep Excavations & Complex Basements

Executing a multi-level basement adjacent to critical infrastructure requires Tier 1 engineering experience. JSBC Consulting specializes in the design of deep foundation systems, temporary shoring, and load transfers for large-scale Class 2 and commercial developments in Sydney.

Our structural engineering portfolio demonstrates our capability in managing complex subterranean challenges:

• One City Square: We delivered the complex structural design for this 62,800 square metre masterplanned precinct, which included supporting a 42-storey tower and a 22-storey residential tower over a massive five-level deep basement.

Secure Your Subterranean Structural Design

Do not let utility compliance delay your high-rise development. If your site requires deep excavation near Sydney Water infrastructure, you need an engineering team capable of designing unyielding shoring systems backed by meticulous BIM documentation.

Contact JSBC Consulting today to discuss your basement retention, shoring, and high-rise structural engineering requirements.

Under the regulatory landscape of New South Wales, developing high-rise residential towers requires more than just standard engineering capability; it demands legislated compliance expertise.

For developers, architects, and builders in Sydney, securing a structural engineering team that is fully registered under the Design and Building Practitioners (DBP) Act is a mandatory step for Class 2 developments.

JSBC Consulting confirms that our principal engineers are registered Design Practitioners under the NSW DBP Act. We possess deep, proven experience in delivering compliant, practical structural frameworks for complex, large-scale residential precincts and high-rise towers.

What is a Class 2 Building?

Before commencing any multi-residential project in NSW, it is vital to understand its classification, as this dictates the regulatory path.

According to the National Construction Code (NCC), a Class 2 building is broadly defined as a building containing two or more sole-occupancy units, each being a separate dwelling.

This classification typically includes:

• High-rise residential apartment towers.

• Multi-unit residential complexes.

• Mixed-use buildings where a significant portion is residential living quarters.

For the precise definition and latest updates, refer to the ABCB (Australian Building Codes Board) National Construction Code.

Understanding Your Obligations Under the NSW DBP Act

The NSW Government introduced the DBP Act to restore confidence in the construction sector by ensuring residential apartment buildings (Class 2) are designed and built to high standards.

Crucially, the Act requires that regulated designs—including structural and façade engineering—must be prepared by a registered Design Practitioner. Furthermore, a Design Compliance Declaration must be issued before building work commences. This is not an optional step; it is a legislative requirement to ensure the structural integrity and safety of high-density living spaces.

For detailed information on developer and practitioner obligations, visit the NSW Fair Trading Design and Building Practitioners Hub.

Our Experience with Complex Class 2 High-Rise Towers

Compliance is just the baseline. The true challenge in Sydney’s market lies in engineering structures that are buildable, efficient, and capable of handling complex loads.

JSBC Consulting specializes in Tier 1 high-rise residential projects. Our teams are adept at solving intricate structural challenges, such as transferring massive tower loads through transfer podiums, designing deep basement retention systems, and engineering frameing for significant wind loads.

Our portfolio demonstrates extensive experience in delivering large-scale Class 2 infrastructure:

• Prime Macquarie Park: A massive mixed-use precinct featuring four residential towers up to 22 storeys, totaling 680 apartments. JSBC engineered an iconic, multi-storey structural tripod to resolve complex load transfers for the high-rise towers.

• The Archibald, Gosford: A landmark twin-tower development consisting of two 28-storey high-rises housing 289 residential apartments and a hotel over a common podium. Our team optimized high-rise load paths while navigating complex ground conditions.

• One City Square: A “city within a city” master-planned precinct. JSBC delivered the complex structural design for a 42-storey tower and a 22-storey residential tower, supported over a colonnaded podium and a five-level deep basement.

• Vivacity Stage 2, Sydney Olympic Park: A significant mixed-use precinct including 583 residential apartments across six towers, reaching up to 30 storeys in height, situated over a large transfer podium structure.

Secure Your DBP Compliant Structural Design

Navigating Class 2 regulations requires an engineering partner who understands both the legislation and the complexities of high-rise construction.

Ensure your next project is structurally sound and legally compliant. Contact JSBC Consulting to engage our DBP Registered engineers today.