A sewer inspection report is an official document that identifies the location and condition of sewer infrastructure on or near a property. In Sydney, obtaining one before you purchase or develop is not just smart practice — in many cases it is a legal requirement. Getting this right early can save you tens of thousands of dollars and months of delays.
What Is a Sewer Inspection Report and Why Does It Matter?
A sewer inspection report (sometimes called a Section 73 Compliance Certificate in New South Wales) documents the position of Sydney Water’s sewer mains, branch drains, and any easements that may affect your land. It tells you exactly where underground infrastructure sits relative to your building envelope, and whether any proposed works will encroach on a sewer asset.
For buyers, this information can be the difference between a sound investment and a nightmare renovation. For developers, it is a mandatory step in the DA and construction certificate process. Without it, you cannot legally connect a new dwelling to the Sydney Water network, and your certifier will not sign off on your project.
Beyond compliance, the report gives you real leverage. If sewer assets run through the middle of your proposed building footprint, you may need to divert them — a process that can cost anywhere from $15,000 to well over $100,000 depending on depth, diameter, and access. Knowing this before exchange of contracts puts you in a far stronger negotiating position.
What Does a Sewer Inspection Report Include?
The report typically contains a sewer service diagram (sometimes called a “works-as-executed” plan) showing the location of all Sydney Water assets on and adjacent to the property. This includes the depth and diameter of pipes, the position of manholes and inspection shafts, and any registered easements burdening the title.
For development applications, the report will also outline the conditions under which Sydney Water will allow building over or adjacent to its assets. These conditions are governed by Sydney Water’s Building Over or Adjacent to Assets guidelines, which set minimum clearance distances and structural requirements. In some cases a formal Building Over Asset agreement must be executed before construction can begin.
A comprehensive report may also flag whether the property has an existing legal point of discharge, the capacity of the local network to accept additional loads, and whether a developer contribution or augmentation fee will apply. These are the details that separate a thorough assessment from a basic diagram lookup.
How Much Does a Sewer Inspection Report Cost in Sydney?
Costs vary depending on the complexity of your project, the size of the lot, and who prepares the report. Here is a realistic breakdown of what you can expect to pay in 2026:
| Service Type | Who Provides It | Typical Cost Range (AUD) | Turnaround Time |
|---|---|---|---|
| Basic sewer service diagram (online) | Sydney Water (self-service) | $30 – $80 | Instant to 2 business days |
| Section 73 Compliance Certificate (residential) | Sydney Water or accredited provider | $500 – $1,500 | 10 – 30 business days |
| Section 73 Compliance Certificate (subdivision/development) | Accredited provider | $1,500 – $5,000+ | 20 – 60 business days |
| CCTV drain inspection (existing pipes) | Licensed plumber | $300 – $800 | Same day to 3 days |
| Building Over Asset assessment | Accredited provider | $1,000 – $3,500 | 10 – 20 business days |
Keep in mind that these figures cover the reporting and certification costs only. If sewer works are required — diversions, new connections, or augmentations — the construction costs are entirely separate and can be substantial.
How Do You Get a Sewer Inspection Report in Sydney?
The process differs depending on whether you are a buyer doing pre-purchase due diligence or a developer seeking formal certification. Here is the typical path for each:
For Pre-Purchase Due Diligence
- Order a sewer service diagram directly from Sydney Water’s online portal. This gives you a basic plan of assets on the lot and is a good starting point.
- Review the diagram with a professional — a water servicing coordinator or civil engineer — to interpret clearance distances and identify any red flags before you commit.
- Commission a CCTV inspection of any existing on-site drainage if the property has older infrastructure, particularly in Sydney’s inner suburbs where clay pipes from the early 1900s are still common.
- Check the title for easements — sewer easements are registered on the title and will appear in a standard title search, but the sewer service diagram tells you where the physical pipe sits relative to those easements.
For Development Applications
- Engage an accredited Water Servicing Coordinator (WSC) as early as possible — ideally before lodging your DA. The WSC acts as your liaison with Sydney Water throughout the approval process.
- Submit a pre-DA servicing enquiry to understand what infrastructure upgrades or contributions Sydney Water will require.
- Obtain the Section 73 Compliance Certificate — this is the formal sewer inspection report required for all multi-lot subdivisions and most medium-density developments in NSW.
- Resolve any Building Over Asset requirements — if your design encroaches on sewer assets, your WSC will negotiate the conditions and manage the agreement with Sydney Water.
- Submit works-as-executed plans after any new drainage infrastructure is installed, so the network records are updated accurately.
Working with an experienced provider like All Spec Approvals means you have a dedicated WSC managing every step of this process, reducing the risk of delays caused by incomplete submissions or missed technical requirements.
Can You Get a Sewer Inspection Report Yourself?
For a basic sewer service diagram, yes — Sydney Water’s online portal allows any property owner or their representative to order one directly. This is perfectly adequate for a quick desktop check before making an offer on a property.
However, for anything involving development, subdivision, or formal certification, you cannot do this yourself. The Section 73 Compliance Certificate must be issued either directly by Sydney Water or through a Sydney Water-accredited provider. Accreditation requires specific technical qualifications and professional indemnity insurance that only licensed WSCs hold.
Attempting to manage the Section 73 process without accreditation is not just risky — it is not permitted under the Sydney Water Act 1994. Errors in submissions can trigger costly re-works and push your project timeline back by months. This is one area where professional involvement is not optional; it is built into the regulatory framework.
Common Mistakes to Avoid When Obtaining a Sewer Inspection Report
Many buyers and developers make avoidable errors that cost time and money. Here are the most common pitfalls:
- Relying solely on the title search. Easements on title do not always reflect the actual physical location of pipes. A sewer service diagram is essential to confirm where assets truly sit.
- Leaving it too late in the DA process. Sydney Water’s assessment timelines are fixed. Engaging a WSC after your DA is lodged — rather than before — often means your construction certificate is held up waiting for sewer compliance.
- Assuming older properties have no sewer conflicts. In many Sydney suburbs, original sewer alignments were never formally easement-registered. The pipe is still there; it just does not appear on the title.
- Ignoring stormwater and sewer separation requirements. Sydney Water and local councils have strict rules about cross-connections. A thorough inspection will flag any illegal connections between your stormwater and sewer systems.
- Not budgeting for augmentation fees. High-density developments often trigger network augmentation charges that are not apparent until Sydney Water’s formal assessment. Factor this into your feasibility from day one.
When to Call a Professional
If your project involves any of the following, you should engage an accredited Water Servicing Coordinator before you go any further:
- A multi-lot subdivision or Torrens title separation
- Medium or high-density residential development (dual occupancy, townhouses, apartments)
- A proposed building that sits within 1 metre of a sewer main or branch drain
- A property in an older Sydney suburb with unknown or unmapped drainage infrastructure
- Any commercial or mixed-use development requiring a trade waste assessment
The cost of professional advice at this stage is a fraction of what a sewer diversion or delayed project will cost you later. All Spec Approvals specialises in water and sewer approvals across Sydney and the greater NSW region, managing the full Section 73 process so your project stays on programme. If you are unsure whether your project triggers a formal sewer inspection report requirement, reach out for an obligation-free assessment before you commit to a design or a contract.
Conclusion
A sewer inspection report is one of the most important pieces of due diligence you can undertake before buying or developing a Sydney property. It tells you where underground infrastructure sits, what conditions apply to building near it, and what costs you may face in achieving compliance.
For buyers, a basic sewer service diagram ordered directly from Sydney Water is a sensible first step. For developers, engaging an accredited WSC early — and obtaining your Section 73 Compliance Certificate as part of your pre-DA process — is the most effective way to protect your timeline and budget.
Do not leave this to chance. The regulatory framework in NSW is clear, the timelines are fixed, and the financial consequences of getting it wrong are significant. Contact All Spec Approvals today to discuss your project’s sewer servicing requirements and get the right approvals in place from the outset.
Frequently Asked Questions
What is a sewer inspection report in NSW?
A sewer inspection report in NSW is an official document — most commonly a Section 73 Compliance Certificate — that identifies the location and condition of Sydney Water’s sewer assets on or near a property. It is required for most development and subdivision approvals and must be issued by Sydney Water or an accredited provider under the Sydney Water Act 1994.
How long does a sewer inspection report take in Sydney?
A basic sewer service diagram from Sydney Water’s online portal is available within one to two business days. A formal Section 73 Compliance Certificate for residential development typically takes 10 to 30 business days, while complex subdivision or multi-unit projects can take 20 to 60 business days depending on the scope of works required.
Do I need a sewer inspection report before buying a property in Sydney?
You are not legally required to obtain a sewer inspection report before buying, but it is strongly recommended. Sewer assets running through a proposed building footprint can significantly affect what you can build and at what cost. Ordering a sewer service diagram before exchange of contracts costs very little and can reveal major issues early.
How much does a Section 73 Certificate cost in Sydney in 2026?
A Section 73 Compliance Certificate for a standard residential development in Sydney typically costs between $500 and $1,500 in 2026. For subdivisions or larger multi-unit projects, costs range from $1,500 to $5,000 or more, depending on complexity. These figures cover certification only and do not include any required sewer works or augmentation fees.
Can a homeowner apply for a sewer inspection report themselves in Sydney?
Homeowners can order a basic sewer service diagram directly from Sydney Water’s online portal for a small fee. However, a formal Section 73 Compliance Certificate — required for development and subdivision — must be managed by a Sydney Water-accredited Water Servicing Coordinator. This is a regulatory requirement, not just a recommendation.
What happens if I build over a sewer without approval in Sydney?
Building over a Sydney Water sewer asset without approval is a serious breach of the Sydney Water Act 1994. Sydney Water can require you to demolish any unapproved structure at your own expense, and you may face significant fines. Always obtain a Building Over Asset agreement through an accredited provider before commencing any construction near sewer infrastructure.
