How Adelaide Plumbers Fix Pipes Under Concrete Without Excavation

You have just found out that there is a cracked or damaged pipe running under your driveway. Maybe a CCTV inspection revealed tree root damage. Maybe sewage is backing up, and the blockage is somewhere beneath two tonnes of concrete. Either way, your first thought is probably about jackhammers, trucks, and your driveway being torn apart.

Here is the good news. In most cases, Adelaide plumbers can repair that damaged pipe without touching your driveway or patio. The solution is called pipe relining, and it allows us to fix pipes from the inside without any excavation. No jackhammers. No concrete removal. No weeks of disruption.

This guide explains how pipe relining works, when it is suitable for pipes under concrete, and what Adelaide homeowners can expect from the process.

Why Pipes Under Driveways and Patios Fail in Adelaide

Pipes do not care what is built on top of them. They crack, corrode and get invaded by tree roots regardless of whether there is grass, pavers or 100mm of reinforced concrete above. But when a pipe does fail under a driveway or patio, the repair becomes much more complicated and expensive if excavation is required.

The most common reasons pipes fail under Adelaide driveways include:

Old clay or earthenware pipes

Homes built in Adelaide from the 1950s through to the early 1980s typically have clay sewer pipes. These were installed in short sections joined together, and over 40 to 60 years, those joints deteriorate. Cracks develop, joints separate, and tree roots find their way in.

Tree root intrusion

Tree roots are attracted to the moisture inside sewer and stormwater pipes. Even small cracks release enough moisture for roots to detect. Once a root finds its way into a pipe, it grows rapidly and causes blockages. In suburbs like Burnside, Unley, Norwood and Mitcham, where established trees are common, root damage under driveways is something we see regularly.

Ground movement

Adelaide’s reactive clay soils expand when wet and shrink when dry. This movement puts stress on underground pipes, especially rigid clay pipes that cannot flex. Over the years of seasonal movement, pipes crack, or joints pull apart. The Adelaide Hills and foothills suburbs like Blackwood, Belair, Glen Osmond and Burnside experience significant soil movement.

Heavy vehicle loads

Driveways that regularly support heavy vehicles like trucks, caravans or boats can put extra stress on pipes below. If the pipe was not installed with adequate bedding and cover, the weight above can cause cracks or crush the pipe over time.

Poor original installation

Sometimes pipes were installed with minimal fall, inadequate bedding, or joins that were never sealed properly. These problems might take decades to cause issues, but eventually they do.

The Problem With Traditional Pipe Repair Under Concrete

Before pipe relining technology became available, fixing a damaged pipe under a driveway meant one thing: dig it up. This process involves:

• Cutting and removing the concrete – A concrete cutter or jackhammer is used to break through the driveway or patio. For a typical repair, this might mean removing a section 1 to 2 metres wide and several metres long.
• Excavating to the pipe – Sewer pipes in Adelaide are typically 500mm to over 1 metre deep. All that soil needs to be dug out and disposed of.
• Replacing the damaged section – The old pipe is removed, and a new PVC pipe is installed.
• Replacing the concrete – New concrete is poured to match your existing driveway. Except it rarely matches perfectly, and you are left with a visible patch.

For a typical driveway excavation and pipe replacement in Adelaide, homeowners can expect to pay anywhere from $5,000 to $15,000 or more, depending on the length of pipe, depth, and how much concrete needs replacing. The job usually takes several days, and you cannot use your driveway during that time.

This is why pipe relining has become so popular. It avoids all of this.

How Pipe Relining Works: The No-Dig Solution

Pipe relining repairs damaged pipes from the inside. Instead of digging up and replacing the old pipe, we insert a new pipe lining inside the existing one. Think of it like putting a new pipe inside the old pipe.

Here is how the process works step by step:

Step 1: CCTV Drain Inspection

First, we send a camera down the drain to inspect the damage. This shows us exactly where the cracks, breaks or root intrusion are located, how long the damaged section is, and what condition the rest of the pipe is in. The camera footage also confirms the pipe is suitable for relining.

Step 2: High-Pressure Cleaning

Before relining can begin, the pipe needs to be completely clean. We use high-pressure water jetting to blast away tree roots, debris, grease and any buildup on the pipe walls. This creates a clean surface for the liner to bond to. For heavy root infestation, we use mechanical cutting heads to remove roots before jetting.

Step 3: Preparing the Liner

The liner is a flexible tube made of fibreglass or felt material saturated with a special epoxy resin. It is cut to the exact length needed to cover the damaged section, plus a bit extra at each end to ensure complete coverage. The resin is mixed and applied to the liner just before installation.

Step 4: Inserting the Liner

The liner is inserted into the pipe through an existing access point. This is usually an inspection opening, a drain cleanout, or sometimes through the toilet connection point. No excavation is needed because we access the pipe through openings that already exist.

Once in position, an inflatable bladder inside the liner is expanded with air. This pushes the liner firmly against the walls of the old pipe, pressing the resin into every crack and gap.

Step 5: Curing

The resin needs time to harden and cure. Depending on the product used, this takes anywhere from 2 to 4 hours. Some systems use UV light or hot water to speed up curing. Once cured, the liner becomes a rigid, seamless pipe within the old pipe.

Step 6: Final Inspection

After curing, we run the camera through again to inspect the finished liner. This confirms the liner has bonded properly, there are no wrinkles or defects, and the repair is complete. You get to see the before and after footage so you can see exactly what was done.

Damaged Pipe Under Your Driveway?

We specialise in no-dig pipe relining across Adelaide. Our CCTV inspection will show you the exact problem, and we will explain whether relining is the right solution for your situation. Upfront quotes with no surprises.

Call 0484 600 095 for a Pipe Relining Assessment

Benefits of Pipe Relining for Adelaide Homeowners

• No concrete removal or replacement – Your driveway, patio, paths and landscaping stay intact. This alone saves thousands of dollars and avoids the headache of mismatched concrete patches.
• Faster completion – Most relining jobs are completed in a single day. Compare that to excavation repairs, which can take 3 to 5 days or longer.
• Lower total cost – Even though relining technology is specialised, avoiding excavation and concrete replacement usually makes it cheaper overall. A typical relining job under a driveway costs between $3500 and $8000, depending on pipe length and diameter.
• Long-lasting repair – Quality pipe liners come with warranties of 35 to 50 years. The epoxy liner is resistant to tree roots, corrosion and ground movement. In many cases, the relined pipe will outlast a brand-new PVC pipe.
• Seamless finish – Unlike the old pipe, which had joints every metre or so, the liner creates a smooth, jointless interior. This improves flow and eliminates the weak points where roots typically enter.
• Minimal disruption – You can usually use your driveway the same day. There is no construction zone, no trucks blocking the street for days, and no mess to clean up.

When Pipe Relining Might Not Be the Right Solution

Pipe relining works for most damaged pipes, but not all. Here are situations where excavation might still be necessary:

• Completely collapsed pipes – If the pipe has collapsed and the walls have fallen in, there is nothing for the liner to bond to. The liner needs an existing pipe structure to work with. A CCTV inspection will show whether the pipe is cracked or collapsed.
• Severe bellies or sags – A belly is a low spot in the pipe where it has sunk. Relining can cover minor bellies, but if the sag is severe, waste will still pool in that spot even after relining. In these cases, that section may need to be excavated and relaid with proper fall.
• Back-to-back bends – The liner can navigate gentle bends, but sharp back-to-back bends can be difficult to line properly. Your plumber will assess this during the CCTV inspection.
• Pipes that are too small – Relining adds a layer inside the existing pipe, which slightly reduces the internal diameter. For pipes that are already undersized, this reduction might affect flow. Most residential sewer pipes are 100mm or larger, which is fine for relining.

Our plumber in Adelaide will always be upfront about whether relining is suitable for your situation. If the CCTV inspection shows relining is not the best option, we will explain why and discuss alternatives.

Common Scenarios We See in Adelaide

Here are some real situations where Adelaide homeowners have benefited from pipe relining under driveways and patios:

Tree root blockages in Burnside and Unley 

Established suburbs with mature trees often have recurring root problems. Relining seals the pipe completely, stopping roots from re-entering. We frequently reline pipes in these suburbs where large deciduous trees line the streets and backyards.

Cracked clay pipes in 1960s homes

Suburbs like Glenelg, Marion, Morphett Vale and Modbury have thousands of homes from this era with original clay sewer lines. When these pipes crack under driveways, relining saves homeowners from costly concrete replacement.

Damaged pipes under new extensions

Sometimes homeowners discover pipe problems after building an extension or patio over the sewer line. Relining allows repairs without demolishing the new construction.

Pipes under carports and garages

Excavating inside a carport or garage creates major access problems. The equipment cannot fit, and the concrete slab may be structural. Relining avoids all of this.

Get a CCTV Inspection First

Not sure what is wrong with your pipe? A camera inspection will show us exactly what is happening underground. We will give you the footage and an honest assessment of your options.

Call 0484 600 095 to Book a Drain Camera Inspection

Frequently Asked Questions

• How much does pipe relining cost in Adelaide?

For a typical residential pipe relining job under a driveway or patio, expect to pay between $3,500 and $8,000, depending on the length of pipe, diameter and access. This includes the CCTV inspection, cleaning, relining and final inspection. Compare this to excavation costs of $8,000 to $15,000 or more when concrete replacement is involved.

• How long does pipe relining take?

Most relining jobs are completed in a single day. The actual relining process takes a few hours, plus curing time. You can usually use your drains again the same evening or the next morning.

• Will pipe relining stop tree rootsfrom coming back?

Yes. The relined pipe is completely sealed with no joints or gaps for roots to enter. Unlike clearing roots with a jet blaster, which only removes them temporarily, relining provides a permanent solution. Roots cannot penetrate the cured epoxy liner.

• How long does a relined pipe last?

Quality pipe relining systems come with warranties of 35 to 50 years. The epoxy materials are resistant to corrosion, root penetration and most chemicals found in household drains. A properly installed liner should last as long or longer than a brand-new PVC pipe.

• Can you reline a pipe with multiple bends?

The liner can navigate bends up to 45 or even 90 degrees in most cases. Multiple gentle bends are usually fine. Sharp back-to-back bends can be more challenging. The CCTV inspection will show us the pipe layout and help us determine if relining will work for your specific situation.

• Does relining reduce the pipe size?

The liner adds a layer about 3 to 5mm thick to the inside of the pipe, which slightly reduces the internal diameter. For a standard 100mm sewer pipe, this is not a problem and will not affect flow. In fact, the smooth finish of the liner often improves flow compared to the rough, scaled interior of an old clay pipe.

• What if the camera inspection shows that relining will not work?

If the pipe is collapsed or has other issues that make relining unsuitable, we will explain your options honestly. Sometimes a short section needs excavation while the rest can be relined. We will always give you the most cost-effective solution for your situation rather than pushing unnecessary work.

• Do I need council approval for pipe relining?

Generally no. Pipe relining is considered a repair rather than new work, so council approval is not usually required for residential properties. If your property has heritage listing or other special conditions, check with your local council. Your plumber can advise on any requirements.