Gardenvale's Older Units and Shared Drains

Gardenvale is one of Bayside’s most compact suburbs, and a lot of it lives in units: interwar flats near the station, 1960s and 1970s brick walk-ups, and villa units strung along shared driveways. Almost all of these were built with one thing in common underground. Rather than each dwelling having its own drain to the street, the units share a single sewer line that collects from every kitchen, bathroom and laundry on its way to the authority’s main.

Shared drains work fine until they do not. And when a fifty-year-old shared earthenware line finally blocks, the plumbing problem is usually the easy part. The hard part is the second question everyone asks while the gully trap is still overflowing: whose problem is this, and who pays?

For a strata-titled block in Victoria, the general shape is this. Pipes that service only your lot, typically the branch lines from your own fixtures up to where they join the shared line, are usually the lot owner’s responsibility. Pipes that service more than one lot, or that run through common property, are generally the owners corporation’s responsibility to maintain and repair. The shared sewer line that everybody drains into is the classic example of the second category.

That is the general shape, not a guarantee for your block. The exact boundary depends on your plan of subdivision, which defines where lots end and common property begins, and older plans are not always tidy about services. Villa units on some older subdivisions have different arrangements again. When it matters, the plan and the owners corporation rules are the documents that decide, and Consumer Affairs Victoria publishes plain-language guidance on owners corporation responsibilities that is worth reading before a dispute rather than during one.

Beyond the property boundary there is a third party: the water authority owns and maintains the sewer main itself and usually the connection point. If a blockage turns out to be in the authority’s main rather than the private drain, it is their job to clear it. A plumber who locates the blockage properly can tell you which side of that line you are on.

This is where the drain camera earns its keep. A blockage found in the branch line serving only unit 3 is, in most blocks, unit 3’s cost. The same symptoms caused by roots in the shared line twenty metres downstream are an owners corporation cost, shared by everyone. Without a camera and a locator, nobody knows which situation they are in, and the owner who happened to call the plumber often ends up wearing a bill that should have been shared.

So our standard approach on unit blocks is to camera the line, locate the blockage on the surface with a sonde, and record footage showing exactly where the problem sits relative to the junctions. That footage is what lets an owner, a property manager or a committee settle the responsibility question with evidence instead of assertions. We provide it before anyone commits to repair work.

Most shared drains under Gardenvale’s older blocks are glazed earthenware, laid in short sections with rigid joints, and they fail in familiar ways.

For an owner-occupier, the practical sequence is: deal with the immediate blockage, get camera footage and a written location, then take both to the owners corporation if the problem sits in shared pipework. Keep copies of everything. Recurring blockages in a shared line are a maintenance item the corporation should be planning for, not an emergency it rediscovers annually.

For tenants and property managers there is an extra layer. A blocked or broken sewer that makes a rental property unfit to live in falls under the urgent repairs provisions of Victoria’s Residential Tenancies Act, which set out how quickly such faults must be addressed and what tenants can do if they are not. Consumer Affairs Victoria explains the current rules and processes. Managers juggling an owner, an owners corporation and a tenant at once need a plumber who documents as they go, which is a large part of the property manager work we do across Bayside: photos, footage, a clear statement of where the fault sits, and an itemised invoice addressed to the right party.

One more note for anyone tempted to save the argument by grabbing a hire-shop eel: clearing and repairing sanitary drainage is licensed plumbing work in Victoria, and on a shared line a botched clear does not just affect your unit. It affects the neighbours downstream of your mistake.

The least expensive time to deal with a shared drain is between blockages. A camera survey of the main shared line gives a committee an honest picture: sound pipe, root-affected joints that suit relining, or failed sections that need excavation. From there, maintenance can be budgeted like painting or gutters instead of arriving as a special levy after a flood. If your block in Gardenvale or the surrounding suburbs has a drain that blocks on a schedule, that survey is the conversation to start. We are happy to attend a committee meeting armed with footage rather than adjectives.