Main page › Guides › Service connections

Connecting water, power and wastewater

From Modular Living Australia — the independent knowledge base Last updated: 8 Oct 2026

On-site wastewater systems are designed to AS/NZS 1547, and in New South Wales installing one needs council approval under section 68 of the Local Government Act 1993.^[1][2][3] Electricity connection fees are set by the distributor rather than the retailer, and Energex states that a basic connection needing no network upgrade is often free; builder-published commercial guidance puts water, sewer, power and telecommunications connections at about A$7,600–A$30,600 in total.^[5][6][8]

A serviced suburban block hides how much work "connecting services" actually is, because the work is already done: water, sewer, power and telecommunications are stubbed to the boundary. Move that same house to an infill block on an old septic system, or to acreage with no mains at all, and three separate approval-and-connection processes appear, each run by a different authority.

This is where a modular build's site budget most often blows out, and it is covered separately here from the broader site works costs because the rules — as opposed to the prices — are specific and knowable in advance.

Builder-published guidance puts service connections at roughly A$7,600 to $30,600 depending on location, with rural septic systems commonly A$15,300 to $38,200.^[8] Those are commercial figures spanning an enormous range, because the answer depends almost entirely on the block.

Wastewater: the approval most people underestimate §

If a block is not connected to mains sewer, the wastewater system needs its own council approval — and that approval is frequently the critical-path item, not the building approval.

The national framework is AS/NZS 1547 (on-site domestic wastewater management), supported by the AS/NZS 1546 series for treatment units and AS/NZS 3500 for plumbing and drainage.^[1] Each state overlays its own legislation, so the process differs by jurisdiction.

New South Wales

Any on-site treatment system requires council approval under Section 68 of the Local Government Act 1993 and the Local Government (General) Regulation 2021.^[2][3] There is a distinctive extra step: NSW Health accredits the design of domestic sewage systems before a council can approve installation, and secondary treatment systems such as aerated wastewater treatment systems (AWTS) must be on that accredited list.^[3][4]

NSW approvals also do not last forever. On-site systems are often given operational approvals that require periodic renewal, with some councils renewing every three to five years.^[4] This is an ongoing obligation, not a one-off permit.

Queensland

A plumbing and drainage application is lodged with the council, and the council plumbing inspector reviews it against the Queensland Plumbing and Wastewater Code and the relevant Australian Standards. For a standard septic system with trench or bed disposal, no separate state-level tank approval is needed beyond the council plumbing permit.^[4]

The common process

Across states, the sequence is broadly consistent:

1. A site and soil evaluation assesses the land's capacity to absorb effluent.^[9]
2. A designer produces a system design showing tank location and specifications, the land application area, and load calculations demonstrating compliance with AS/NZS 1547.^[9]
3. An application — often titled "Application to Install a Human Waste Treatment Device" or similar — is lodged with the council, together with the soil report and design plans.^[9]
4. Council environmental health officers review it against state legislation, local bylaws and the standard, a process that can take several weeks to months.^[2]
5. A "Permit to Install" is issued, sometimes with conditions such as an ongoing maintenance or service contract.^[2][3]

The soil's absorption capacity determines the size of the land application area, which in turn can determine whether a given system fits the block at all. On a small or poorly draining lot, this is a genuine design constraint, not a formality.

Electricity: the fee is smaller than the myth, but the connection can be large §

Two different things get called the "connection cost," and conflating them causes most of the confusion.

Putting your name on an existing meter. Where a house is already wired to the grid, the connection fee is essentially a metering-service charge to register the account.^[6] Commercial guidance puts this initial charge in the range of A$10 to $60, alongside a daily network charge of around A$1.^[10] It is payable even if the home has solar and a feed-in tariff.^[6]

Physically extending the network to an unconnected block. This is the number that matters for a new or rural build, and it is set by the distributor — the business that transports energy — not the retailer that sells the plan.^[6] Charges are regulated by the Australian Energy Regulator.^[5]

The distributor's own framing is useful. Energex states that basic connections requiring no upgrade or change to the network — most homes, solar under 10 kW, batteries and small businesses — are generally free of charge, and distinguishes these "Standard Control Services" from "Alternative Control Services" such as negotiated connections and asset relocations, which incur a fee.^[5]

The word doing the work is "basic." A block that needs new poles, a longer service run or a network upgrade moves into the negotiated, chargeable category. TasNetworks illustrates the mechanism: for large connections over 100 amps or complex projects, a non-refundable assessment fee of at least A$2,603.24 (incl. GST) may be required before you even receive a firm offer, with design costs then deducted from the final contribution.^[7] Its published schedule lists discrete items — creation of a National Metering Identifier at A$49.23 (ex GST), crossover poles with overhead or underground service, and so on — that assemble into the total for a given site.^[11]

The practical point: there is no national figure. The distributor for the address issues a site-specific offer, and where poles or a network extension are involved, that offer can dwarf every other line on this page. It is worth requesting before committing to a block.

Water and telecommunications §

Mains water connection charges are set by the local water authority and vary by network; no single figure applies, and they are bundled into the A$7,600–$30,600 service-connection range in commercial guidance rather than broken out.^[8] Where there is no mains water, rainwater tanks become the supply — and in bushfire-prone areas a minimum tank capacity may be a condition of approval, a point covered under bushfire attack levels.

Telecommunications connection is generally arranged through the national broadband network for the premises. It is not covered in detail by the sources compiled here.

When off-grid is the answer §

On a remote block, the cost of extending the grid can exceed the cost of not using it. This is why so many rural modular builders offer off-grid packages: solar generation, battery storage and rainwater harvesting replace the mains connections entirely, and an on-site wastewater system was going to be required regardless.

Several builders in Australian directories describe off-grid capability as standard or optional. That is a commercial offering rather than a regulatory category — but the underlying logic is sound. Where a distributor's connection offer runs into the tens of thousands, the comparison is not "off-grid versus free grid power"; it is "off-grid system cost versus grid connection cost," and on a sufficiently remote block the former can win.

The wastewater approval process above still applies to an off-grid home. Going off-grid removes the electricity and water connections; it does not remove the Section 68 (or equivalent) wastewater approval.

What this page does not cover §

State-specific mains water and sewer connection charges, and the detailed wastewater approval processes for Victoria, South Australia, Western Australia, Tasmania, the ACT and the Northern Territory, are not set out in full here; the controlling documents are each state's on-site wastewater guideline and each council's requirements. Victoria's is published by EPA Victoria.^[1]

The Australian Standards themselves — AS/NZS 1547, the AS/NZS 1546 series and AS/NZS 3500 — are copyright documents available through Standards Australia and are not reproduced here.^[1]

Connection charges quoted above are indicative and, in the case of the commercial ranges, not independent survey data. The distributor and the council for a specific address are the only reliable sources for that address.

References §