An empty-looking part of a backyard may already be doing important work. It may carry a registered drainage easement, protect access to a sewer, contain electricity or communications assets, receive overland flow, or provide the only practical route for maintenance. A granny flat that fits geometrically can still be unapprovable, unsafe, expensive to service or vulnerable to future excavation.
The right starting question is not “Can we build over the easement?” It is: What legal right, physical asset or service function exists here; who controls it; and what evidence would support a buildable design?
Jurisdiction and currency note — 11 September 2026: This is general Australian information using NSW Land Registry Services, Sydney Water and NSW safety examples. Easement law, utility ownership, referral processes, technical clearances and approval terminology differ by state, territory, council and network area. Obtain current title, survey and asset-owner requirements for the property. This article does not guarantee consent, certification, utility approval, relocation, connection cost or buildability.
Easements and services are related, but not identical
An easement is a legal interest or right affecting land. It may benefit another parcel or an authority and can support drainage, access, services or other purposes. Its terms, location and benefiting party matter. A title notation alone may not show the complete physical or legal picture; the relevant registered dealing and plan may need to be obtained and interpreted.
A service asset is physical infrastructure such as a sewer, water main, stormwater pipe, gas line, electricity cable or telecommunications conduit. An asset may sit inside an easement, outside one, or not appear accurately on a basic site sketch. Private house drains and cables also matter even when they are not utility-owned.
A planning or building control is different again. Setbacks, landscaping, access, flood response and structural requirements may affect the same area. Clearing one test does not clear all three layers.
Who answers which question?
Land registry, surveyor and lawyer or conveyancer
NSW Land Registry Services maintains land-title records on behalf of the NSW Government. Obtain a current title search, deposited plan and relevant instruments rather than relying on a sales plan. The Registrar General’s easement guidance is authoritative about registered dealings, but legal interpretation of rights, restrictions, release or variation should come from a property lawyer or conveyancer.
A registered land surveyor identifies boundaries and surveys relevant features and levels. The surveyor does not grant permission to build over an easement or utility.
Utility or asset owner
The asset owner sets protection, access and approval requirements for its infrastructure. Sydney Water says approval is required when building or digging near its pipes, drains or meters. Its building-plan approval guidance explains that plans must be assessed before work starts because development may damage or limit access to services.
That principle is useful nationally, but the responsible organisation and process vary. Identify the actual water, sewer, drainage, gas, electricity and communications owner for the address. Council may own stormwater assets; a water corporation may own sewer; an owners corporation may control shared private infrastructure.
Planner, certifier and council
A planner can identify the approval pathway and planning implications. Council or a registered certifier performs only the statutory functions available under the applicable pathway. Neither can waive another party’s property rights or utility conditions merely by issuing a planning or building certificate.
Council may also act separately as drainage authority, road authority or asset owner. Ask which “hat” the council officer is wearing and whether the response is formal approval, preliminary advice or general information.
Engineers and service specialists
A civil or hydraulic engineer can design stormwater and service solutions. A structural engineer can address loads, footing interaction and protection measures. A utility-accredited coordinator may be needed for asset location, protection, adjustment or connection. These professionals design and document solutions; the relevant authority accepts or rejects work within its remit.
Why a clear title is not enough
Title records are essential, but they are not a complete utility map. Conversely, a utility plan showing a pipe does not establish all legal rights affecting the land. Before You Dig Australia’s pre-excavation guidance says its tools provide plans and information for underground and overhead infrastructure, helping prevent injury, service disruption and costly damage.
Treat BYDA plans as one evidence stream, not centimetre-accurate survey data or permission to excavate. Asset plans may be schematic, private services may be absent and site conditions may have changed. Where position or depth affects design, use the locating, survey and authority process appropriate to the asset and risk—potentially including accredited locating, potholing or non-destructive excavation under a safe-work method.
An evidence-first workflow
Step 1: assemble the legal-property pack
Obtain and date:
- current title search and deposited or strata/community plan;
- every easement, covenant or restriction instrument relevant to the proposal;
- an appropriate boundary and detail survey;
- existing approvals and drainage or service documents held by council;
- owners-corporation records where shared property is involved.
Create a schedule listing the easement’s purpose, burdened area, beneficiary or authority, instrument reference and unresolved interpretation. Do not paraphrase “easement for services” as “cannot build”; equally, do not assume silence means permission.
Step 2: create a coordinated constraints plan
On one controlled base plan, plot boundaries, easements, buildings, trees, levels, visible pits and meters, known public assets, private service routes, overhead lines, stormwater paths and proposed access. Label the source and confidence of each item.
Use three statuses: confirmed, supported by suitable current evidence; indicative, useful for planning but requiring confirmation; and unknown. This prevents a coloured line copied from a search result from becoming a false design datum.
Step 3: identify asset owners and requirements
Send a precise enquiry to each relevant owner. Include the property identifier, survey, concept footprint, proposed excavation and known asset information. Ask:
- Is the asset information current enough for concept design?
- What horizontal, vertical and maintenance clearances apply?
- Is building over or near the asset prohibited, conditionally acceptable or assessed case by case?
- Are protection works, access openings, encasement, piering, relocation or specialist design required?
- Who may prepare and certify the submission?
- What approval must be obtained before certification and before excavation?
For Sydney Water-serviced land, Tap in is part of the building-plan and connection process. Other regions use different portals and providers.
Step 4: test options before detailed design
Compare at least three responses: avoid the constrained area, span or protect where officially acceptable, or relocate the asset where feasible. Evaluate each against approval risk, authority fees, engineering, excavation, access, programme, maintenance rights and disruption to the main home.
Moving the building is often cheaper than moving infrastructure, but not always. Record the basis rather than relying on a rule of thumb.
Step 5: coordinate planning, structure and hydraulics
The selected solution must appear consistently in the site plan, architectural drawings, structural design, stormwater design, landscape work and construction methodology. Check that piers, eaves, stairs, decks, retaining walls and excavation—not only the internal floor area—respect the accepted envelope.
Confirm how the granny flat connects to sewer, water, electricity and communications and where each service crosses other assets. Verify capacity, gradients, pump assumptions, meter arrangements and protection from future work.
Step 6: control excavation and close-out evidence
Before digging, refresh asset information if required, locate services on site, establish exclusion zones and brief workers. SafeWork NSW warns that people, plant and equipment must be kept from unsafe distances to overhead and underground electric lines so far as reasonably practicable, with risk assessment and supply-authority controls where separation cannot be assured.
SafeWork NSW’s excavation and earthmoving guidance also requires current essential-services information for the work area and adjacent areas before work is allowed to commence. That information must be provided to the people carrying out the work and kept readily available for inspection. The guidance identifies failures to use, share and understand asset maps as contributing factors in plant strikes, so a plan request should become a site control—not remain an unread attachment.
Retain authority approvals, approved plans, inspection records, as-built surveys, test results and connection evidence. As-built information is valuable for future owners and maintenance teams.
Warning signs
- The only site information is a real-estate plan or aerial image.
- “No easement shown” is treated as “no service exists”.
- BYDA plans are treated as exact locations or excavation permission.
- A designer places the floor plan before obtaining title and survey information.
- The quote excludes relocation, protection, authority fees and connection work without an allowance.
- A builder proposes excavation before services are located and marked.
- An authority’s preliminary email is described as formal build-over approval.
- Piers, eaves, retaining walls and access paths are omitted from the clearance check.
- The scheme blocks a maintenance route, pit, inspection opening or overland-flow path.
- Different consultants use different survey or drawing revisions.
Questions before commitment
- Which current title, plan and instruments define the legal constraint?
- Who benefits from the easement, and whose written consent or approval is required?
- Who owns each public and private service?
- Which locations and depths are confirmed, indicative or unknown?
- What authority standards and maintenance clearances apply?
- Can the design avoid the constraint without compromising privacy, access or amenity?
- If protection or relocation is proposed, who designs, approves, constructs and certifies it?
- What is excluded from the builder’s price?
- What evidence is required before design freeze, excavation and occupation?
- What is the stop condition if location, depth, capacity or authority acceptance differs?
A safer project decision
Do not reduce the issue to whether a rectangle overlaps a dashed line. A defensible decision links legal rights, surveyed facts, physical assets, authority requirements, professional design and construction controls. Freeze the granny-flat footprint only when the critical constraints are coordinated and the remaining uncertainty is priced, assigned and visible.
About AMESCORP
AMESCORP has a commercial interest in granny-flat design, building and advisory services. This article is educational content and is not a title opinion, survey, service location, engineering design, utility approval, planning approval, legal advice or quotation. AMESCORP may coordinate investigations but cannot grant rights over an easement or bind an authority or utility. Any engagement should define scope, assumptions, exclusions and evidence deliverables in writing. No AMESCORP consultation, design or quotation guarantees approval, relocation, connection, cost, programme or buildability.
Reviewed official sources
These are the first-party and authoritative references reviewed for this article.
- How to find a record — NSW Land Registry Services; accessed 2026-09-11.
- Easements — NSW Registrar General's Guidelines; accessed 2026-09-11.
- Building over or next to assets — Sydney Water; accessed 2026-09-11.
- Building plan approvals — Sydney Water; accessed 2026-09-11.
- Sydney Water Tap in — Sydney Water; accessed 2026-09-11.
- What to do before you dig — Before You Dig Australia; accessed 2026-09-11.
- Power lines — SafeWork NSW; accessed 2026-09-11.
- Excavations and earthmoving plant in construction — SafeWork NSW; accessed 2026-09-11.
- Secondary dwellings — NSW Department of Planning, Housing and Infrastructure; accessed 2026-09-11.