“No-dig” pipe repair isn’t a single technology, it’s a category that includes several distinct methods, each suited to different pipe conditions, sizes and situations. Understanding which method applies to your situation helps you ask better questions when getting quotes. This guide covers all the main trenchless sewer repair options available in Australia, what each does, and when each is the right choice.
The quick answer
The most widely used no-dig sewer repair method in Australia, including on the Central Coast, is cured-in-place pipe (CIPP) relining. It suits most residential pipe conditions. Point repair (patch liner) is a CIPP variant for isolated defects. Pipe bursting is used where the pipe needs to be upsized. Slip lining is used for large-diameter municipal pipes. For most residential and commercial property owners on the Central Coast, CIPP relining and point repair cover the vast majority of scenarios.
Method 1: Cured-in-Place Pipe (CIPP), “drain relining”
What it is: A resin-impregnated felt or fibreglass liner is installed inside the existing pipe and cured hard, forming a new structural pipe inside the old one.
How it works:
- Pipe is cleaned by hydro jetting
- Liner is pulled or inverted into place
- An inflation bladder inflates the liner against the pipe wall
- Resin cures (ambient, steam or UV) to form a rigid pipe
Best for:
- Root intrusion and joint deterioration in residential sewer mains
- Cracked or joint-failed pipes in good enough structural condition to host a liner
- Pipes under driveways, slabs, gardens where excavation is undesirable
- Standard residential 100-225 mm diameter pipes
Not suited for:
- Completely collapsed pipes (no bore remaining)
- Pipes with very severe displacement where the liner can’t navigate the offset
- Pipes that need to be relocated or re-graded
Typical cost on the Central Coast: $3,500, $11,000 for standard residential jobs
Method 2: Point Repair (Patch Liner)
What it is: A short section of CIPP liner (typically 300 mm, 1,500 mm) installed over a specific, localised defect rather than the full pipe run.
How it works: Identical to full CIPP relining, but the liner is cut to length to cover only the defect area. Access and cure are the same.
Best for:
- One or two isolated defects on an otherwise sound pipe
- Root entry at a single joint
- A specific crack that doesn’t justify full-length relining
- Cost-saving where full relining isn’t warranted
Not suited for:
- Multiple defects spread along the pipe (full relining is better value)
- Structural problems that extend beyond the repair length
Typical cost on the Central Coast: $850, $2,000 per point repair
For the comparison, see point repair vs full-length relining.
Method 3: Pipe Bursting
What it is: A bursting head is pulled through the existing pipe, fracturing it outward and simultaneously pulling a new pipe (typically HDPE) in behind it.
How it works:
- Access pits are excavated at each end of the run (usually 2 small pits)
- A steel cable is fed through the existing pipe
- A bursting head is pulled through the cable, fracturing the old pipe into the surrounding soil
- A new HDPE pipe is attached behind the bursting head and pulled into position
Best for:
- Pipes that need to be upsized (pipe bursting can install a larger diameter than the original)
- Pipes in severe condition where relining isn’t possible
- Situations where the soil conditions allow the burst pipe fragments to be displaced outward
Not suited for:
- Urban areas with nearby services (burst pipe fragments displace outward, can affect adjacent pipes or cables)
- Rock environments where fragments can’t be displaced
- Situations where the existing pipe provides structural support (near foundations)
Current availability on the Central Coast: Less common than CIPP, requires specialist equipment. Available from larger contractors but less frequently offered than relining.
Typical cost: Comparable to or slightly higher than CIPP relining, plus the 2 excavation pits.
Method 4: Slip Lining
What it is: A smaller-diameter pipe (typically HDPE or GRP) is inserted into the existing pipe, with the annular space between them grouted.
How it works:
- A new pipe of slightly smaller diameter is manufactured in sections or coils
- It’s pushed or pulled through the existing pipe
- The annular space (gap between old and new pipe) is grouted to fix the new pipe in position
Best for:
- Large-diameter infrastructure pipes (300 mm+)
- Gravity sewers and storm drains at infrastructure scale
- Situations where some diameter loss is acceptable
Not suited for:
- Residential 100-150 mm pipes (too much diameter reduction for a viable slip liner)
- Pipes with significant bends or junctions that prevent slip liner passage
Current availability on the Central Coast: Used primarily by Council and infrastructure contractors for mains rehabilitation. Not typically used for residential property drain repair.
Method 5: Spiral-Wound (Profile) Lining
What it is: A PVC profile strip is wound into a spiral in the existing pipe, forming a new structural pipe. Used primarily for large-diameter pipes.
How it works: A winding machine traverses the pipe while winding a PVC profile strip into a continuous spiral. The result is a new pipe formed in-situ.
Best for:
- Large culverts, stormwater mains and sewer mains (300 mm+)
- Live-flow conditions where the pipe cannot be taken out of service
Current availability on the Central Coast: Infrastructure-scale only. Not used for residential property drain repair.
Method 6: Mechanical Spot Repair (Point Repair with Stainless Steel Sleeve)
What it is: A stainless steel sleeve is mechanically expanded against the pipe wall at a specific defect point.
How it works: A sleeve and expansion mechanism are guided to the defect location and the sleeve is expanded mechanically to grip the pipe wall.
Best for:
- Very localised defects in pipes where resin cure is problematic
- Emergency temporary repairs
- Metal pipe sections where expansion grip is reliable
Less common than CIPP point repair: In the residential market, CIPP point repair has largely replaced mechanical sleeve repair because the resin bond seals the defect more effectively.
Decision guide: which method for your Central Coast property?
| Your situation | Recommended method |
|---|---|
| Standard 100 mm residential sewer, root intrusion, cracked | Full CIPP reline |
| Single root entry joint, rest of pipe sound | Point repair (CIPP) |
| Pipe completely collapsed over 1-2 m, otherwise sound | Excavation at collapse + CIPP reline of balance |
| Pipe under slab, root intrusion | CIPP reline (through toilet access) |
| Old pipe under driveway, structurally sound | CIPP reline |
| Pipe needs upsizing | Pipe bursting (with excavated end pits) |
| Municipal drain main rehabilitation | Slip lining or spiral winding (Council’s domain) |
Why CIPP relining dominates residential no-dig repair in Australia
CIPP (drain relining) has become the dominant residential no-dig method because:
- No excavation along the pipe run, only existing access points needed
- Works with existing junctions, junctions are reinstated in place by robotic cutter
- Suitable for the typical residential pipe size (100-150 mm) without significant diameter loss
- Fast, UV cure jobs complete in one day
- Long-lasting, 50+ year service life with proper installation
- Competent contractor availability, more contractors are trained in CIPP than in pipe bursting
For Central Coast residential property owners, CIPP is almost certainly the technology your contractor will recommend, and in most cases, it’s the right recommendation.
The role of CCTV in method selection
No no-dig method can be correctly specified without a CCTV inspection. The inspection determines:
- Whether the pipe bore is intact enough for a liner
- Where defects are located and how severe they are
- Whether any sections need excavation before no-dig work can proceed
- The pipe diameter and access configuration
See our CCTV drain inspection explained guide for what’s included in a thorough inspection.
Frequently asked questions
Is pipe bursting better than relining? Not inherently, they solve different problems. Relining is better for standard residential repair (preserves diameter, no end pits needed). Pipe bursting is better when the pipe needs upsizing or when the pipe condition is too poor for a liner to grip. They’re complementary technologies.
Are there no-dig methods for private stormwater pipes? Yes, CIPP relining is used for stormwater pipes the same as sewer pipes. The liner specification is slightly different (doesn’t need the same chemical resistance). See our stormwater drain relining guide.
Is there a no-dig option if the pipe has completely collapsed? Not at the collapse point itself. Excavation is required at a complete collapse to restore the bore. After excavation and repair at the collapse point, the remainder of the pipe can be relined without digging.
Can no-dig methods be used for pipes bigger than 225 mm on my property? CIPP relining is available in larger diameters, but it’s less common in residential settings. For pipes over 225 mm on a residential or small commercial property, get quotes that specify the liner product available in your pipe diameter.
Do all no-dig methods require a licensed plumber? Yes. All sewer and drain repair methods in NSW require a licensed plumber and drainer, regardless of whether they’re trenchless (no-dig) or conventional excavation methods.
Not sure which no-dig method applies to your situation? Book a CCTV inspection to get the diagnosis first.