Sydney Apartment Shared Water Billing: What Conveyancers Check

In many Sydney apartment buildings, water use is not billed to each owner directly. Sydney Water bills the owners corporation for whatever its master meter records beyond any individual unit meters. That includes common areas and, where hot water is centralised, all hot water. Those costs usually flow through strata levies. Before exchange, buyers should confirm which metering model applies and review the strata records showing what the building actually pays.

A Utility Bill That Sits Inside the Levy

For a house buyer, water is simple: one property, one meter, one bill.

Apartments do not always work that way.

Depending on when the building was approved, how it is titled and how its hot water is supplied, part or all of an owner's water use may never appear on a personal water account.

It is billed to the owners corporation instead and recovered through strata levies.

That has consequences beyond the settlement statement.

Elyment has already examined how water usage is apportioned at settlement, which is a one-off calculation.

This article looks at the structure that continues for as long as the buyer owns the lot: who is billed, for what water, and how much of it is outside the owner's control.

Three Metering Models, Three Different Bills

Sydney Water's Multi-level individual metering guide (Version 12, August 2025) sets out how billing works in each type of building.

Sydney Apartment Water Metering and Billing Comparison

1. Master Meter Only

What the unit owner is billed for: No direct water use charge.
What the owners corporation is billed for: All water use in the building.
Where the buyer's exposure sits: Entirely in strata levies.

2. Individual Meters, No Centralised Hot Water

What the unit owner is billed for: All water used inside the unit.
What the owners corporation is billed for: Common water, calculated as the master meter total less the sum of unit meters.
Where the buyer's exposure sits: Own account plus a common-water share in levies.

3. Individual Meters With Centralised Hot Water

What the unit owner is billed for: Only cold water used inside the unit.
What the owners corporation is billed for: Common water, including all hot water used inside units.
Where the buyer's exposure sits: Own cold-water account plus a larger common share in levies.

Sydney Water states that in the third model the common water charge is "for about 40% of total water measured by the master meter", because the hot water used in apartments is not measured by the individual meters.

In each model, Sydney Water notes that the common charge "is typically then apportioned by the owners' corporation through strata levies."

Why Many Sydney Buildings Still Share a Meter

Individual metering became a condition of connection for most new multi-level buildings when Sydney Water introduced its rules in September 2014.

Under the current guide:

Strata and stratum subdivided buildings: Must install individual unit meters.
Non-strata residential, serviced apartment and mixed-use buildings: Must install plumbing that allows future meters, but the meters themselves are optional.
Existing multi-level buildings: Are not required to have individual unit meters.

The result is a mixed stock.

Older apartment blocks across Sydney often still rely on a single master meter.

The City of Sydney's water guide for apartment buildings states plainly that most high-rise apartment buildings have a single water meter measuring use in both common areas and individual apartments.

Newer buildings may have unit meters but still route a significant share of water through the common account.

What the Common Account Can Contain

Buyers often picture common water as garden irrigation.

Sydney Water's guide lists a wider range of uses measured by the master meter rather than unit meters:

Gardens and landscaping.
Swimming pools.
Rainwater tank top-up.
Fire hose reels.
Cooling towers.
Car wash bays.
Centralised hot water used inside apartments.

The guide also flags a less obvious item.

Where a building uses a fire sprinkler configuration under the FPAA101D code, toilets connected through the sprinkler system cannot be individually metered.

That water is recorded as common use and billed to the owners corporation.

Leaks follow the same path.

Water lost from common property pipework passes through the master meter and is paid by all owners.

The City of Sydney recommends that owners corporations consider submeters at strategic points on common property, together with an online monitoring portal, to identify and respond quickly to leaks.

It also notes that water use in apartment buildings affects common property electricity costs.

What the Conveyancer Should Establish

The contract of sale and a standard strata report will not always answer the water question directly.

A focused review usually works through the following steps.

Identify the metering model. Is there a master meter only, or individual unit meters as well? Sydney Water's guide requires unit meters to be installed in common areas, labelled with the unit number, not inside apartments.
Confirm how hot water is supplied. A centralised hot water plant means hot water used in the apartment is billed as common water, regardless of individual meters.
Read the Sydney Water lines in the administrative fund. The owners corporation's financial statements and invoices show what the building pays for water and how that figure has moved over time.
Check how the cost is recovered. Is water simply part of the general levy, or has the owners corporation adopted another arrangement? Any special arrangement should be traceable to a resolution in the records.
Search the minutes for water issues. Leak investigations, unexplained spikes, hot water plant replacement, submetering proposals and plumbing works all leave a trail in meeting records and correspondence.
Look for retrofit discussions. Sydney Water's guide states that installing individual meters in an existing strata building must be endorsed by the owners corporation and must comply with its plumbing, location and metering system rules.
Check for non-compliance notices. If an individually metered building has not met Sydney Water's requirements, Sydney Water will not individually meter the site and will bill all water use to the owner, which in a strata building is the owners corporation.

These records are available under section 182 of the Strata Schemes Management Act 2015.

NSW Government guidance on strata record keeping confirms that financial records, including invoices, bank statements and levy records, must be kept for seven years, and that a potential buyer, or a strata searcher they hire, can inspect them with the owner's authority.

The fee for an authorised person is $60 including GST for the first hour and $30 for each additional half hour.

Elyment's guide to what a strata report covers compared with a building inspection explains why a records search and a physical inspection answer different questions.

Water billing sits between the two.

The Investor Dimension

For investors, the metering model shapes rental returns as well as levies.

NSW Fair Trading guidance on water supply in rental properties states that a landlord can only ask a tenant to pay water usage charges if:

The property is separately metered, or water is delivered by vehicle.
The property meets the prescribed water efficiency measures.
The charges are no more than the landlord is billed by the water supplier.
The landlord gives the tenant a copy of the relevant part of the bill or other evidence of the cost.

Payment must be requested within three months of the bill being issued, and the tenant must have at least 21 days to pay.

Since 23 March 2025, the efficiency measures include dual flush toilets with a minimum 3-star WELS rating, alongside the existing flow-rate limits on showers and certain taps.

The practical consequence is significant.

In a master-metered building, the owner has no individual usage charge to pass on, so water consumption remains a levy cost carried by the landlord.

In an individually metered building with centralised hot water, only the cold water on the owner's own account can potentially be recovered, and only if the efficiency requirements are met.

Sydney Water's guide makes the same point: unit owner charges can be passed to tenants "if their lease allows."

Where Renovation Plans Meet the Meter

Water billing also intersects with physical works after settlement.

Several points are worth raising before a renovation scope is fixed.

Meter location: Unit meters must sit in common areas and their cupboards must not be locked, because Sydney Water needs unrestricted access. Works in corridors, plant rooms or riser cupboards need to keep that access clear.
Isolation and shut-downs: In a shared-supply building, isolating water for a bathroom strip-out may involve building management. Elyment's article on power and water isolation before tile removal covers the sequencing.
Fixture choices: For investors, replacement taps, showers and toilets determine whether the property meets the water efficiency measures needed to pass usage charges to a tenant.
Common property boundaries: Pipework, risers and meter assemblies are frequently common property. Elyment's guide on what common property means before renovating explains why approvals may be required.

Questions Buyers Should Put in Writing

Water Billing Due Diligence Checklist

1. Is the Building Master-Metered Only, or Does Each Lot Have a Sydney Water Unit Meter?

Where the answer is usually found: Sydney Water account details, strata manager and meter cupboard inspection.

2. Is Hot Water Supplied by a Central Plant or by Individual Units?

Where the answer is usually found: Strata manager, building manager and physical inspection.

3. What Did the Owners Corporation Pay Sydney Water Over Recent Years?

Where the answer is usually found: Administrative fund statements and invoices.

4. Have There Been Leak Investigations, Usage Spikes or Plant Failures?

Where the answer is usually found: Meeting minutes, correspondence and maintenance records.

5. Has Submetering or Retrofitting Been Proposed or Approved?

Where the answer is usually found: Meeting minutes, motions and capital works plan.

6. For Investors, Can Water Usage Legally Be Passed to a Tenant?

Where the answer is usually found: Metering model plus a water efficiency check of the unit.

A dedicated strata conveyancing review can add these items to the standard records search, and a contract review can confirm whether any special condition addresses utilities.

Buyers in newer buildings should also be aware that the same record trail applies to electricity, as covered in Elyment's article on embedded networks in strata reports.

The Broader Picture

Shared water billing is not a defect.

It is a structural feature of how many Sydney apartment buildings were designed and titled.

It does change where costs sit, how much control an owner has over them, and what an investor can recover.

The answers are almost always in the records.

Buyers who identify the metering model, read the building's water spend and connect it to their renovation or leasing plans enter the owners corporation knowing what they are paying for.

Buying Into a Sydney Strata Building?

Elyment can review strata records, contract terms and post-settlement works planning so that ongoing costs and renovation steps are clear before you commit.

Request a Strata Purchase Review

Sources and References

Regulatory and Water Billing Sources

1. Sydney Water – Multi-Level Individual Metering Guide

Technical guidance covering individual unit metering, master meters, common water usage, centralised hot water systems and billing arrangements for multi-level buildings.

Multi-Level Individual Metering Guide – Version 12, August 2025

2. City of Sydney – Water Guide for Apartment Buildings

Guidance on water consumption in apartment buildings, shared metering, leak monitoring and opportunities to improve water efficiency.

Water Guide for Apartment Buildings

3. NSW Government – Strata Record Keeping Requirements

Information about owners corporation record keeping, financial documentation, retention periods and access to strata records.

Strata Record Keeping Requirements

4. NSW Government – Water Supply in Rental Properties

Guidance on when landlords can charge tenants for water usage, separate metering requirements, water efficiency standards and billing obligations.

Connection and Supply of Water to Rental Properties

Related Elyment Insights

1. Settlement Adjustments NSW: Council Rates, Water Usage and Strata Levies Buyers Need Priced Before Settlement

An examination of how water usage, council rates and strata levies are apportioned during property settlement.

Read the NSW Settlement Adjustments Guide

2. Conveyancing Sydney: Strata Report vs Building Inspection

An explanation of the different information available through strata records searches and physical building inspections.

Read the Strata Report vs Building Inspection Guide

3. Tile Removal Sydney: The Power and Water Isolation Check Before Bathroom Demolition Starts

Considerations for coordinating utility isolation, building access and renovation work before apartment bathroom demolition.

Read the Power and Water Isolation Guide

4. Strata Says It Is Common Property: What That Means Before You Renovate the Floor

An examination of common property boundaries, renovation approvals and the responsibilities affecting apartment improvement projects.

Read the Common Property Renovation Guide

5. Embedded Network in a Strata Report: What NSW Apartment Buyers Should Ask

An explanation of embedded electricity networks and the questions buyers should investigate before purchasing a strata property.

Read the Embedded Network Guide

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