The Sewer at the Back of Your Adelaide Block: SA Water Easements, Build-Over Approval and Whether a New Lot Can Be Serviced

General information only for South Australian landowners, and not legal, engineering or surveying advice. Where an SA Water main or easement affects your block, the location and level of the asset belongs to a licensed surveyor and a civil engineer, the interests recorded against your title belong to your solicitor or conveyancer and the Lands Titles Office, and whether a structure or lot layout can be authorised belongs to SA Water on its current policy. Charges are re-set from time to time — confirm the live position before you rely on it. Nothing here is a determination about your land.

There is a version of the Adelaide infill story that plays out most weeks. An owner in Croydon, Klemzig, Woodville or Clarence Park has a generous block, a rear yard doing nothing, and a plan to put a second dwelling behind the existing house. A designer produces a concept and the feasibility looks reasonable. Then someone finally orders the asset plans, and a wastewater main runs along the rear of the allotment — sometimes with a registered easement over it, sometimes without one — with a maintenance structure sitting almost exactly where the new dwelling's living area was drawn.

The conversation then stops being about zoning and yield and becomes a question about pipes: where the asset actually is, how deep it sits, what SA Water will and will not authorise above it, and whether each proposed allotment can be serviced inside its own boundaries. That second conversation can take a proposed allotment off the plan altogether, and in our experience it tends to happen later in a project than it usefully could.

Cyberate PM is engaged by the owner. We are not paid on the transaction, we are not paid by a developer or a lender, and our role here is narrow: we do not locate assets, we do not design drainage, we do not certify anything, and we do not decide what SA Water will approve. We coordinate the licensed surveyor, the civil engineer and the conversation with SA Water, and we make sure that conversation happens before design money goes out the door. We coordinate; we do not give the advice.

One boundary before we start. This article is about the physical asset and what it does to your lot layout, and it carries no charges, fees or rates; where cost falls is noted only as a question of who bears it, never as an amount. Every dollar question — augmentation, connection, what must be cleared before new titles issue — belongs in our separate piece on SA Water's augmentation charges and how they are levied, and ultimately with SA Water's current published schedule.

The easement and the main are two different problems

The two are easy to treat as a single item. They are assessed differently, and by different means, so running them together tends to produce the wrong question. An easement is a legal interest — a right held by someone else over your land, here typically a right for SA Water to have its infrastructure there and to enter, repair, maintain and replace it. It occupies a defined strip, usually recorded as a dealing against a title.

The main is the physical asset. It has a real alignment, a real depth, real junctions where private drains connect into it, and real access structures — maintenance holes, maintenance shafts, inspection openings and government inspection points. Those need to stay reachable by people and equipment for the working life of the asset. (Where the authority's asset ends and private plumbing begins is a different point again — the connection point — and your surveyor and SA Water will confirm where it sits.)

The distinction matters because the answers differ. A wastewater easement is a strip you may, in some circumstances and for some structure types, be authorised to build within. An access structure is operating infrastructure that has to stay accessible. As SA Water publishes it, construction is not permitted over water easements, nor over its sewer access points, maintenance holes, maintenance shafts, inspection openings and government inspection points. Wastewater easements are treated differently: some structures may be authorised there, in writing, case by case. And the prohibition on access structures is not the whole of it — the asset SA Water is protecting is the pipe as well as the openings into it, so nothing should be assumed authorisable anywhere over the alignment. What may sit above a main, and on what footings, is SA Water's assessment on your plans, not a distance you can read off a drawing. So "people build over easements all the time" does not get you to an answer. The question that does is: which asset, where exactly, and what is on top of it.

Why the title search is not the whole answer

The instinctive due-diligence move is to pull the title and look for an easement. A title search is worth running — but a clean title is not an all-clear. Land Services SA is explicit that some easements may not be listed on the certificate of title, and it names electricity, sewerage, water and telecommunications easements as examples. Separately, a main can physically cross private land in an older Adelaide suburb simply because that was the sensible way to drain the fall of the land when the area was sewered. In the older parts of Unley, Prospect, Norwood, Port Adelaide Enfield and Charles Sturt, we see rear-of-allotment wastewater alignments often enough that they should be treated as ordinary rather than exotic — the asset search is what tells you whether yours is one.

The physical check is separate. Approximate asset locations are available through Before You Dig Australia — the natural companion to the rest of the questions to ask before you buy a block in Adelaide. As information, it is generally at its most useful while the layout is still open to change and before design work has been committed to; how it bears on any particular transaction, and what the legal due diligence around one should cover, belongs with your own solicitor or conveyancer. But those plans are indicative. SA Water warns that pipeline locations must be physically confirmed before mechanical excavation or boring, and notes that in older suburbs the connection point may never have been brought into the property at all. Turning an indicative plan into a design input is surveying and engineering work — and it produces what your designer needs: where the asset is, and how deep.

Building over the easement is a separate approval, running alongside your planning application

This is a part of the process that is easy to read the wrong way. The assumption is often that once planning consent is granted, the easement question has been dealt with. Planning consent and easement authorisation are not the same decision. Where a registered easement exists, an assessment authority will take it into account and may well decline to approve something that obstructs it. But a planning consent is not an authorisation from the party who holds the easement. SA Water's own guidance puts the two on parallel tracks: where you propose work over its easements — a house, an extension, a retaining wall, a shed, a carport, a pool, a rainwater tank, excavation or fill — you are directed to give SA Water the building plan and a building plan application at the same time as you lodge with council, and its written approval is to be obtained before building work starts.

That sequencing changes your program. This is not a post-consent formality folded into the conditions; it is a second assessment, by a different body, on different criteria, running concurrently — and it can force a redesign of a scheme that has already cleared planning. SA Water publishes what happens if you get this wrong. If authorisation is not granted, you may be required to redesign or relocate the structure so no part of it encroaches over the easement. If you build without authorisation, you may be required to remove completed or partially completed structures and restore the land to its original condition. Where the cost of that work falls is a matter for SA Water's current published terms and for your own arrangements — confirm the live position with SA Water, and what it means for you with your solicitor or conveyancer.

What can be authorised is assessed case by case, on the structure type, its footings, and whether access to the asset is preserved. That is why there is no rule of thumb to hand you: the design is the answer, and the asset owner assesses it on its merits.

Every new allotment has to work as a serviced allotment

Now the part that actually reshapes yield. Creating a new Torrens allotment does not just create a line on a plan; it creates a parcel whose servicing is looked at on its own. In practice SA Water and your land-division surveyor will set what each new allotment must have — ordinarily its own connection, with the private drainage inside its own boundaries rather than running across a neighbour's land or across the parcel you are about to sell. Confirm the requirement for your division with SA Water before the layout is fixed.

That requirement, whatever form it takes on your site, converts lot layout from a planning exercise into an engineering one. Where the main sits at the rear and the fall runs the wrong way, the rear lot may not reach a lawful connection point without crossing the front lot. Where the main is in a neighbour's property, SA Water's position is that the neighbouring owner's written consent is required to enter their land and carry out works to extend the network and service your new lots — so your yield can turn on a consent that is the neighbour's to give or withhold. Where the network does not reach, you are into a main extension, which SA Water arranges under a land development agreement, with an accredited consulting engineer designing and an accredited civil contractor constructing. Who bears the cost of that work is set by SA Water's current published terms for those agreements and by what the parties arrange between them — a question to put to SA Water and your solicitor rather than an assumption to carry into a feasibility.

Each outcome moves the driveway, the building envelope, the finished floor levels and the boundary lines. All argue for drawing the plan around the asset, and for running the planning and servicing tests together rather than in sequence. The zone, frontage and site-area tests in our piece on what actually determines minimum block size in Adelaide tell you what the Planning and Design Code will entertain. They say nothing about where the pipe runs. A layout can satisfy every planning test on the page and still be unserviceable.

Where this sits in the sequence, and why the sequence is tightening

SA Water assesses the servicing of a land division as part of the statutory process: once the plan of division is lodged through the PlanSA system it is referred to SA Water for comment, and its requirements come back into the assessment. The servicing answer is coming regardless. The only variable is whether you learn it before or after you have paid for a concept design, a survey set and a lodgement.

There is also a legislative development worth flagging. The Statutes Amendment (Planning, Infrastructure and Other Matters) Act 2025 passed the South Australian Parliament in November 2025. It deals with binding agreements between developers and SA Water for the provision of water and sewer services in connection with the land division certificate — broadly, letting the division assessment proceed while servicing is settled by agreement rather than by completed connection. Exactly which provisions have commenced, and how SA Water and PlanSA are applying them in practice, are matters to confirm when you lodge — an Act passing is a different thing from a settled operational practice being in place. The Act points towards settling servicing earlier and through a more formal instrument; whether that is how it currently operates in practice is for SA Water and PlanSA to confirm, not something to assume from the text alone. An unresolved servicing position on a division that is otherwise ready is one of the quieter reasons behind why an approved subdivision still has no titles. Electricity is dealt with on its own track, and it is the other clearance-type mechanism owners tend to meet on a division — but its trigger, its assessing party and its timing are its own. The SA Power Networks leg is worth reading alongside this one rather than assuming the two processes mirror each other.

How Cyberate PM handles this on your project

Our role here is deliberately narrow, and it is coordination. We do not locate SA Water's assets and we do not survey. We do not design private drainage, connection points or main extensions, and we do not certify footings or levels. We cannot tell you what SA Water will approve — that is its decision on its own current policy. And we do not read your title for legal effect; the interests recorded against it, and what they permit, are for your solicitor or conveyancer.

What we do is sequence the work so the answer arrives earlier, while a change to the layout is likely to cost less than the same change would once consent has been granted. We commission the asset search and brief the licensed surveyor to pick up the alignment and levels as part of the feature survey rather than as a later variation. We bring the civil engineer in before the concept plan is fixed, so the layout is drawn around a known asset. We put the build-over and servicing questions to SA Water early and run that correspondence alongside the planning lodgement rather than behind it. And we keep it on one program, so the answer has the best chance of arriving while the second dwelling is still a line on a drawing rather than a design you have paid for. That is the honest value: not a better answer from SA Water, but the same answer earlier.

Frequently asked questions

Can I build over an SA Water easement in South Australia? It depends which asset. SA Water's published position is that construction is not permitted over water easements, nor over its sewer access points, maintenance holes, maintenance shafts, inspection openings and government inspection points. And the prohibition on access structures is not the whole of it — the asset being protected is the pipe as well as the openings into it, so nothing should be assumed authorisable anywhere over the alignment. Over a wastewater easement, some structures may be authorised in writing before work starts — that is SA Water's assessment on your own plans, not something to assume.

My title doesn't show an easement — does that mean there's no main? No — and a clean title is an easy thing to take false comfort from in pre-purchase due diligence. Land Services SA notes that some easements, including sewerage and water easements, may not be listed on the certificate of title — and a main can physically cross private land regardless of what the dealings show. An asset search covers what a title search does not, and the plans stay indicative until a surveyor confirms the alignment on the ground.

Does my development approval cover the easement? Not by itself. A planning consent decides the planning merits. Authorisation to build over an SA Water easement is a separate approval, and SA Water's guidance directs you to lodge with it at the same time as council rather than afterwards. If you build without that authorisation you may be required to remove the structure and reinstate the land, with cost responsibility as set out in SA Water's current published terms — confirm the live position with SA Water.

When is this information most useful? Generally, at the point where it can still change something. Establishing the asset position before concept design means a layout can be drawn around a known alignment instead of redrawn once one surfaces, and owners who order asset plans and have the alignment confirmed early tend to find out that a layout does not work while it is still a drawing rather than a design they have paid for. The same information arriving later is still the same answer; it simply has less left to act on. What that costs, and whether it is worth it on your site, is a question for you and your consultants.

Can I have the main relocated so the layout works? It is a question to put to SA Water, answered as an engineering and asset-management matter — there is nothing to suggest an owner has an enforceable right to relocation, and whether it is pursued comes down to SA Water's own assessment. Where a main extension or alteration is needed to service new allotments, SA Water arranges the work under a land development agreement, with an accredited consulting engineer designing and an accredited civil contractor constructing; where the cost of that falls is set by SA Water's current published terms and the parties' own arrangements. Whether that stacks up on a small infill site is a feasibility question for you, your engineer and your quantity surveyor — not something to assume is available.

If a main or an easement crosses your Adelaide block and you want the servicing question answered before you pay for a design, we can coordinate the asset search, the surveyor and the civil engineer, and sequence the SA Water conversation alongside your planning lodgement. We coordinate your professionals; we do not survey, design, certify or decide what SA Water will approve. Book a free consult.