Sewer easement on your property: what it means before you buy

A sewer easement is a strip of your land that the water authority has a registered right to use for a sewer pipe, including the right to get in and maintain or replace it. You still own the land. What it mainly changes is where you can build. Most authorities will not let you build over maintenance holes or connection points, and building over or near the pipe needs to meet set clearances or get the authority's consent.

The catch most buyers miss is that the rules follow the pipe, not just the easement. Plenty of sewers cross private land with no easement on the title at all.

Sewer easement versus sewer pipe

An easement is registered on the title and drawn on the survey plan, so a title search shows it. But an easement is only one way a sewer can sit on your land. Sydney Water's own building guidelines say that "Some of our critical pipe assets are protected by acquired easements over land, but we have many critical assets that don't have easements," and that you must protect them either way. Icon Water in the ACT is blunter: "Easements are not a reliable guide," and pipes "traverse blocks without easements."

The building rules reflect this. Queensland's code for building near sewers applies to a lot that contains or adjoins the infrastructure, not only one with a registered easement. Victoria's water corporations need consent for work within one metre of their pipes as well as on an easement. In Tasmania, TasWater's consent applies within 2 m of its pipeline where no easement exists.

So the real question for a buyer is not just "is there a sewer easement?" but "where is the sewer, and what is near it?" For easements in general, including rights of way and drainage, see what easements on the title mean before you buy.

How to find a sewer on a property

Use more than one source, because each has gaps:

• The title and survey plan. These show any registered easement and its width. Your conveyancer gets them as part of the searches.
• The water authority's plan. Most authorities sell a plan of their pipes for a property. Sydney Water sells a sewer service diagram showing the private wastewater pipes on a property through its Tap in service. Unitywater sells a detailed infrastructure plan showing mains and maintenance holes. Yarra Valley Water sells a property asset plan.
• Before You Dig Australia (BYDA). A free enquiry gets you plans from the asset owners in the area. BYDA warns that the plans "indicate the presence of underground infrastructure only and not their exact location".
• What you can see on site. A concrete or metal lid in the yard is often a sewer maintenance hole.

None of these pins the pipe to the centimetre. Sydney Water notes its service location diagrams show that its pipes are there but do not pinpoint their exact location. If you are planning to build close by, a plumber or locating service can find the actual line.

Building over or near a sewer: the rules by state

Each state handles this differently. These are the main rules from the authorities' own published guidance, and they change, so check the current version with the authority for your area before you design.

Queensland. Building over or near sewers is assessed against Queensland Development Code MP1.4. The code stops applying beyond 3 m of the infrastructure for a house, shed or similar structure, and beyond 5 m for most other buildings. Within that, a building certifier checks the work against the code's acceptable solutions. Redland City Council's summary of them for a house includes keeping 1.5 m from the centre of a manhole, 1.2 m from the pipe, and 1 m clear of connection points. Lightweight structures such as some patios and sheds can go over a pipe if they meet the conditions. Work that cannot comply is referred to the water service provider, such as Urban Utilities or Unitywater. Urban Utilities warns that building work "may need to be demolished to enable access for maintenance and repair".

New South Wales. Sydney Water says "We must approve your plans before you start any building or excavation work," through its Tap in service. Its guidelines allow certain structures over smaller sewers, but not over maintenance structures or property connection points, and require clear access around them. Hunter Water asks that structures stay at least 1.5 m from its assets unless assessed and approved.

Victoria. Under the Water Act 1989, you need the water corporation's consent to build over its easement or within one metre of its sewer, maintenance hole or other assets. Separately, regulation 130 of the Building Regulations 2018 requires the report and consent of the service authority before building over an easement. Greater Western Water's guide says works over maintenance holes are not permitted.

South Australia. SA Water does not permit construction over its maintenance holes, inspection openings and similar access points. Structures over a sewer in an easement must generally be easily demountable, with set clearances from the main and a maximum encroachment length, and need an application to SA Water.

ACT. Icon Water applies a "pipe protection envelope" above, to both sides and along the full length of its water and sewer networks, whether or not there is an easement.

Tasmania. The Water and Sewerage Industry Act 2008 prohibits building prescribed structures within TasWater easements, or over or within 2 m of its infrastructure, without TasWater's consent.

What a sewer easement means for a buyer

A sewer along a back or side boundary is often no drama. It matters more when:

• The block is small. A sewer and its clearances can take a real bite out of the buildable area, especially on a narrow lot where it runs down one side.
• You plan to extend, add a granny flat, pool or shed. Check where the pipe runs against where you want to build before you buy, not after.
• Something is already built over it. If an existing extension, deck or garage sits over or near the sewer, ask whether it was approved. In NSW, Sydney Water issues a "building over sewer letter" telling you whether it approved a building over or close to its pipes, and conveyancers use it for exactly this. An unapproved structure can be removed at the owner's cost.
• There is a maintenance hole in the yard. You will need to keep it clear and accessible.

Common questions

Can I build over a sewer easement? Sometimes, within limits. Lightweight or easily removed structures can often go over a sewer if they meet the authority's clearances, but the authorities whose rules we checked do not allow building over maintenance holes or connection points, and larger sewers usually cannot be built over at all. Check the current rules with the water authority for your area before you design.

How do I find out if there is a sewer on my property? Check the title and survey plan for a registered easement, buy a sewer or asset plan from your water authority, and lodge a free Before You Dig Australia enquiry. Remember that sewers can cross a lot without an easement, so a clear title does not mean there is no pipe.

Does a sewer easement affect property value? It depends on where the sewer runs and what you want to do with the land. A pipe along a back boundary on a big block may not matter. One that cuts through the best building area on a small lot, or sits under an unapproved extension, can matter a lot.

Who is responsible for the sewer pipe on my property? Generally the water authority looks after its sewer mains, and the owner looks after the private pipes from the house to the connection point. Sydney Water says owners own all wastewater pipes and fittings up to where they connect to its system. Check your own authority's rules for the exact split.

Want utilities and easements for an address shown alongside the zoning, flood and other planning layers? Pop in your address or check out a sample report.

LayeredGeo's Property Report pulls together public planning and site data for property due diligence across Queensland, New South Wales, Victoria, South Australia, the ACT and Tasmania, so you can understand a place before you commit.

Sources

• Sydney Water - Technical guidelines: Building over and adjacent to pipe assets. sydneywater.com.au
• Sydney Water - Certificates, documents and diagrams. sydneywater.com.au
• Business Queensland - Building over or near relevant infrastructure. business.qld.gov.au
• Redland City Council - Building over or near relevant infrastructure fact sheet. redland.qld.gov.au
• Unitywater - Building over pipes and easements. unitywater.com
• Hunter Water - Building over assets. hunterwater.com.au
• Yarra Valley Water - Building over an easement. yvw.com.au
• Greater Western Water - Build over easement guidelines v2.2. gww.com.au
• Icon Water - Building requirements, Book 1 General requirements. iconwater.com.au
• TasWater - Guidelines for building near sewer or water pipelines. taswater.com.au
• Before You Dig Australia - A guide to utility plans. byda.com.au

About this article. Published by LayeredGeo and written from the published research cited in the Sources section above. It is general information about how property and ground conditions are assessed in Australia, not engineering, planning, legal or financial advice, and it is not specific to any property. Check anything that matters against the source dataset or a suitably qualified professional before you rely on it. If you spot something wrong, tell us at hello@layeredgeo.com.au and we will fix it.

← All articles