Sewer Pipe Relining vs Replacement: Which Is Right for Your Melbourne Home?

If your CCTV inspection has come back showing cracked or root-invaded sewer pipes, you have two main options: relining or full replacement. Both are valid. The right choice depends on the type of pipe, the extent of damage, the access to your yard, and your budget. This guide explains both methods, the costs, and when each one wins.

What is sewer pipe relining?

Relining (also called CIPP, or cured-in-place pipe) involves inserting a resin-saturated felt liner inside the existing damaged pipe. The liner is inflated to press against the inside of the host pipe, then the resin is cured (with steam, hot water, or UV light) to harden into a new pipe within the old one. The result is a smooth, jointless inner pipe that’s typically warranted for 35 to 50 years.

Melbourne relining works best on pipes between 100mm and 225mm diameter that are still structurally intact (cracked, root-invaded, slightly displaced, but not collapsed). It’s the go-to for cast iron and vitrified clay sewers in older homes, particularly in inner-east suburbs like Hawthorn, Camberwell and Kew where excavating gardens is impractical.

What is sewer pipe replacement?

Replacement means digging up the damaged section and installing new PVC (or sometimes HDPE) pipe. It can be done by traditional open-trench excavation, or by pipe bursting (pulling a bursting head through the old pipe to fracture it while drawing in new pipe behind).

Replacement is necessary when the host pipe has fully collapsed, when the misalignment is severe, or when access is straightforward and a fresh pipe is genuinely the simpler answer.

Cost comparison in Melbourne

These are 2026 Melbourne east figures. Costs vary with depth, length, and access.

Relining: $400 to $700 per metre for residential. A typical 15 metre section costs $6,000 to $10,500. Includes CCTV inspection before and after.

Open-trench replacement: $200 to $500 per metre for shallow runs in soft ground, much higher for deep runs or under concrete. A typical 15 metre replacement is $3,000 to $7,500, but add $3,000 to $15,000 for reinstatement of driveways, paths and landscaping.

Pipe-burst replacement: similar per-metre to open-trench but with much less reinstatement cost. Often a middle ground.

The headline number for relining looks higher, but it usually wins on total cost once you add reinstatement.

Pros and cons

Relining pros: minimal excavation, no garden destruction, fast (often 1 to 2 days), 35 to 50 year warranty, smooth inner surface improves flow.

Relining cons: requires functional host pipe (not collapsed), slightly reduces internal diameter (usually negligible at 100mm or larger), can’t fix severe misalignment.

Replacement pros: fully resets the system, can fix any pipe condition, allows pipe size upgrades, simple concept.

Replacement cons: garden destruction, longer timeline (3 to 7 days for typical residential), high reinstatement cost, traffic disruption if it crosses a footpath.

When to choose relining

The pipe is cracked or root-invaded but still structurally intact. The pipe runs under a paved driveway, established garden, or close to a heritage tree. You want to avoid disruption to landscaping. You’re staying in the home long-term and want a 35+ year solution.

When to choose replacement

The pipe has fully collapsed (CCTV can’t pass through). The pipe is severely undersized for the household. Access to the pipe is easy (open lawn, no obstructions). You’re pre-selling and a clean replacement adds marketability.

The Melbourne water authority connection

The boundary between your private sewer and the council/water authority main is typically the property boundary. Repairs on your side are your responsibility. Repairs to the connection at the main require coordination with Yarra Valley Water, South East Water, or Greater Western Water depending on your area. See yvw.com.au, southeastwater.com.au, or gww.com.au.

A Certificate of Compliance is required for any sewer work that involves disconnection and reconnection. See vba.vic.gov.au for the framework.

FAQ

Do I need council or water authority approval?

For work entirely on your side of the boundary, no special approval. For work at or across the boundary, yes. Your plumber handles the coordination.

How long does relining last?

Quality residential relining systems are warranted for 35 to 50 years. The actual service life often exceeds the warranty.

Can I reline a small-diameter pipe?

Yes, but below 100mm gets harder and pricier. Most Melbourne residential sewers are 100mm or 150mm, well-suited to relining.

Will my insurance cover sewer relining or replacement?

Generally no for routine deterioration. Some policies cover sudden damage. Check your PDS. The Insurance Council of Australia (insurancecouncil.com.au) has general guidance.

How do I know which option I need?

You need a CCTV inspection. Newton Plumbing offers a fixed-price CCTV survey with a written report showing exactly what’s in the ground and which option will work.

Get a CCTV survey before you decide

Newton Plumbing runs CCTV inspections, relining and replacement work across Melbourne’s east. We’ll show you the footage, walk you through the options, and quote both methods so you can compare.

Phone Newton Plumbing - +61 414 951 362. Licence #107733. Newton Huang Licenced Plumber.

Related reading:

• Why Melbourne’s Clay Soil Cracks Your Sewer Pipes

• • The Real Cost of a Blocked Drain in Melbourne

  • • Tree Roots and Council Trees: Who Pays

    • • Blocked Drain in the Middle of the Night

    • External references:

    • • vba.vic.gov.au - sewer compliance framework

      • • yvw.com.au - Yarra Valley Water boundary works

        • • southeastwater.com.au - South East Water boundary works

          • • insurancecouncil.com.au - sewer damage claims