Pre-Purchase Drain Inspection Brisbane: When You Need One

A building and pest report will tell you the stumps need packing, and the gutters are rusting through. What it can’t tell you is the state of the sewer line under the backyard, because nobody has put a camera down it.

A pre-purchase drain inspection puts a camera down those pipes while you can still walk away. The drainer feeds a CCTV camera in through the overflow relief gully or an inspection opening and films the sewer line all the way to the connection point, with the stormwater lines added if you ask. Cracked joints and roots are easy to spot on the footage. Less obvious finds include a section that has dropped and now holds water, or a repair that looks nothing like the one described on the invoice in the sale documents. Book one on any pre-1980s Brisbane house still running clay pipe. Same for a property where the building inspector has written: “recommend further inspection by a licensed plumber.”

Key takeaways

• A building and pest inspection reports drainage problems visible from the surface. The pipes themselves go unchecked.
• Flushing the toilet proves the drain is clear today. Roots and cracked joints only show on camera.
• Have the drain inspection done during your building and pest inspection period, and confirm with your solicitor or conveyancer that the condition covers it.
• Once you have a repair quote, a defect on the report becomes something to negotiate with.

Does a building and pest inspection check the drains?

Only the parts visible from the surface. Queensland building inspections are generally carried out to AS 4349.1, which limits the report to what the inspector can see and reach, and a clay sewer line half a metre under the lawn is neither.

The building inspector looks at drainage the way they look at everything else on site, from above ground. Water sitting against the slab after rain gets a line in the report. An overflow relief gully lost under garden mulch might get another, though plenty of reports miss it. Beyond that there’s nothing for them to see, hence the wording on so many reports: “recommend further inspection by a licensed plumber.” That’s a referral and nothing more. In plain terms, nobody has looked inside the pipes. A CCTV drain inspection is the only way anyone will.

Then the tone. Building reports are written with the inspector’s liability in mind, which is fair enough from their side, but it makes them hard going for a buyer. Cracked laundry tiles get the same grave language as a leaning retaining wall. Read cold, a perfectly decent house can sound condemned. Ten minutes with the inspector at the end of the job sorts most of that out, if you can get there. Ask what they’d want fixed before moving in. Most will tell you straight, in a way they never would in writing.

Quality varies a lot between inspectors, and a report supplied by the seller was commissioned with the seller’s interests in mind. Pay for your own.

Is running the taps and flushing the toilet enough?

No. It tells you whether the drain is blocked today, and nothing about the pipe itself.

Do it anyway at the open home. Run each tap, flush each toilet and listen. A toilet that gurgles when the shower empties points to a partial blockage or a venting problem further down the line, and that alone justifies a closer look. A clear drain, though, passes this test even when the pipe is cracked through at three joints.

Cracked earthenware will carry water for years. So will a joint with roots growing through it, until the root mass gets big enough to start catching paper, and from then on the blockage comes back every few months, however often it’s cleared. Then there’s the sag. A section that has dropped still drains, but silt settles in the low point and stays. A quick check of the taps is about as far as most buyers’ plumbing inspections go, and none of this shows up in one.

A camera isn’t needed on every purchase. A 2010s house in Springfield Lakes with PVC throughout, no repair history and a clean building report gives you very little reason to go looking. The older stock is a different conversation.

When should you book a pre-purchase drain inspection in Brisbane?

Book one when the house gives you a reason to. These come up most:

• Built before 1980. Houses from that era were usually plumbed with clay (earthenware) sewer pipe, and tree roots get in at the joints.
• Past drainage repairs with little or no paperwork. A single invoice doesn’t show what was done.
• Anything drainage-related in the building report, including a referral to a licensed plumber.
• Mature trees stand within a few metres of the sewer line. Jacarandas and figs are the usual offenders along older streets, with camphor laurels close behind.

Ground conditions add to it. Parts of Logan and Ipswich sit on reactive clay that swells through a wet summer and shrinks over a dry winter, and rigid clay joints don’t flex with it. Over decades, the joints open up. A gap of a few millimetres is enough for a fine root.

On a house that fits any of these, a sewer line inspection is the only way to see the pipe before you own it. Without a drain camera inspection pre-purchase, the first sign of a problem is often a blocked drain after you’ve moved in.

Can a drain work fine on the day and still be a problem?

Yes. A drain can pass every test on inspection day and still block every few months after you move in.

A sagging section is the most common example. Water still flows through it, but silt and solids settle in the low point and build up over time. Keeping it clear usually means regular jetting, an ongoing cost you’d take on with the house.

Older Brisbane properties often have patch repairs, such as a short length of PVC joined into a clay line after a collapse, or a reline patch over one cracked joint. Bathroom renovations also tend to connect new PVC pipe to the old earthenware main. The repair may be fine. The clay pipe on either side is the same age as the section that failed, and that’s where the next problem usually shows up.

So a quote or invoice in the sale documents proves little on its own. At most, it shows someone priced the work and was paid. Footage from a CCTV drain inspection shows whether the work happened and what the pipe looks like either side of it now. Ask the agent for the original footage, and if there isn’t any, book the camera.

Check where the downpipes go. Under Queensland plumbing rules, roof water has to drain to a lawful point of discharge, normally the kerb or a stormwater connection. A downpipe that empties into a garden bed or along the fence line doesn’t meet that requirement. Once you own the property, fixing it is your responsibility, including any water that runs onto the neighbour’s land. If you can’t see where a downpipe ends up, ask for a stormwater inspection as well.

What should the inspection report show, and should you be there?

Footage of every line, plus a written drain inspection report that gives each defect a distance from the access point. And be there if you possibly can.

The PDF that arrives afterwards is mostly stills and timestamps. On site you get the drainer’s running commentary, and that’s where the useful detail lives. Roots six metres in can look dramatic on a monitor. Often they’re hair roots through a joint in reasonable shape, a quick cut, and the drainer will say so as the camera passes. The report will just say “root intrusion, 6.0 m.”

Ask the drainer to locate the pipe and mark each defect on the ground. Repair quotes depend heavily on what sits above the problem. With the location marked, the repair can be quoted without filming the line again.

For older houses, Brisbane City Council has archived plumbing and drainage plans on file for many properties. Set one beside the footage from a CCTV drain inspection in Brisbane’s pre-war and post-war suburbs, and you can see whether the line runs where the plan says. Sometimes it doesn’t. Or a carport slab has gone over the top of it, and if the pipe underneath is an Urban Utilities sewer main, that structure needed approval to be built there. Find out before settlement whether it got one.

Is a drain defect a deal breaker when you’re buying?

The report can’t answer that by itself. You need a repair quote, because the same defect can be a short job in an open lawn or a large one under a concrete driveway.

What sits on top of the pipe drives most of the cost. Lawn and garden beds come up and go back without much fuss. Paths, decking, tiled alfresco areas and driveways are another matter, and on plenty of older Brisbane blocks the sewer runs straight under the driveway on its way to the street. Here pipe relining earns its place. A liner goes in through existing access points and leaves the concrete alone, provided the pipe still holds enough of its shape to take one.

The length of the run to the connection point counts for nearly as much. Work inside the property boundary is much simpler than work that carries on under the footpath toward the main, where permits and the utility come into it.

With a quote in hand, the report becomes a negotiating tool. Ask for the defect to be repaired before settlement, with footage of the finished work, or for the repair cost to come off the price. Sellers have good reason to deal with it. The next buyer’s inspection will find the same crack.

When should the drain inspection happen in the contract timeline?

Inside your building and pest condition period. Book the pre-purchase drain inspection the day the contract is signed, since condition periods in Brisbane’s market are often short and the drainer needs time to get access, film the lines and write the report.

The building and pest condition in a standard Queensland contract refers to a building inspector’s report. A plumber’s drain report may not be covered by it. Your solicitor or conveyancer can check this before you sign. If the condition doesn’t cover a drain camera inspection, they can add a special condition that does. A bad report loses most of its value once the condition date has passed.

Queensland’s seller disclosure statement, required since August 2025, won’t fill the gap. It deals with title, zoning, notices and similar legal matters and says nothing about the condition of the pipes underground.

Access goes through the agent. Let them know the drainer needs the overflow relief gully and inspection openings clear, which on an older property usually means moving a pot plant or digging back some mulch.

How much does a CCTV drain inspection cost in Brisbane?

There’s no single price. Quotes are built on how many lines get filmed and how hard they are to get into, and you should have a fixed figure in writing before anyone turns up.

Access does most of the damage to a quote. An overflow relief gully near the back door and an inspection opening near the boundary make for a quick job. The awkward houses are the ones where the original access points were concreted over during a renovation, which happens more than it should, and the camera then has to go in through the toilet with the pan lifted off and refitted afterwards. Silted or root-bound lines add a round of jetting before there’s anything to film.

Most quotes for a drain camera inspection in Brisbane list the sewer and stormwater lines separately, and some leave the written report off unless it’s asked for. Ask for it. A verbal summary on the driveway won’t get you anything off the purchase price.

Set the drain camera inspection cost beside the price of lifting a driveway, and the comparison isn’t close.

Getting the drains checked before your condition date

SEQ Blocked Drains carries out pre-purchase drain inspections across Brisbane, Logan, Ipswich and the Gold Coast. We film the sewer line (and the stormwater, if you ask), and you’re welcome to stand at the monitor with us while we do it. The written report locates each defect so your solicitor and the agent can work from it, and if something turns up we’ll quote the repair so you have a real figure to negotiate with.

We’re QBCC licensed (licence 15406825) and carry $20 million public liability. Give us your condition date when you book a drain inspection, and we’ll fit the job inside it.