Home›Blog›Pipe Relining vs Replacement

Short answer: For most damaged drains, pipe relining is the better choice — it's typically 30–50% cheaper than digging up and replacing the pipe, it's finished in about a day, and there's no excavation, so your garden, driveway and flooring stay intact. Pipe replacement is only the better option when a pipe has fully collapsed, severely sagged, or lost its shape so badly that a liner can't be installed. A CCTV camera inspection is the only reliable way to tell which one your pipe needs.

Relining vs Replacement: The Key Differences

Here's how the two approaches compare on the things that actually matter:

  • Method. Relining cures a resin liner inside the existing pipe with no digging. Replacement means excavating, removing the old pipe and laying a new one.
  • Typical cost. Relining runs $3,000–$15,000. Full replacement commonly runs $15,000–$50,000+.
  • Disruption. Relining is minimal — no trenches. Replacement tears up lawns, paving or driveways.
  • Time. Relining is often a one-day job. Replacement can take several days to weeks.
  • Lifespan. Both last 50+ years; relining carries a structural warranty.
  • Best for. Relining suits cracks, leaks, root intrusion and misaligned joints. Replacement suits fully collapsed or badly deformed pipes.

Why Relining Usually Wins on Cost

The expensive part of traditional pipe replacement isn't the pipe — it's the digging and the clean-up afterwards. Excavating a sewer line means tearing up lawns, paving, driveways or even internal flooring, then paying again to reinstate all of it. That's why full replacement commonly runs $15,000–$50,000+.

Relining skips the excavation entirely. We feed a resin-saturated liner into the existing pipe, inflate it, and cure it in place to form a smooth, joint-free, root-resistant new pipe inside the old one. No trench, no landscaping bill, far less mess — and the relined section is actually stronger and smoother than the pipe it replaced. For the full pricing breakdown, see our pipe relining cost guide for Melbourne.

"Nine times out of ten the customer's pipe can be relined — it's cheaper, it's done in a day, and the garden stays exactly as it was. I only recommend digging when the camera shows a pipe that's genuinely too far gone to line."

When Replacement Is Genuinely the Right Call

Relining isn't always possible. You'll likely need replacement if:

  • the pipe has fully collapsed and there's no longer a continuous channel to line;
  • the pipe is severely sagged ("bellied") so water pools rather than flows;
  • the pipe is badly out of shape or misaligned beyond what a liner can bridge; or
  • the pipe is too far gone over a long run, making replacement more economical.

This is exactly why we never quote relining blind — the CCTV inspection tells us whether a liner will hold, so you don't pay for the wrong fix.

How We Decide Which You Need

1. CCTV camera inspection

We send a camera down to see the exact damage, length and location inside the pipe.

2. Honest assessment

We tell you straight whether relining will work or replacement is genuinely required — no upselling to the more expensive option.

3. Upfront fixed price

You get the cost before any work starts, with no surprises halfway through the job.

Frequently Asked Questions

For suitable pipes, yes — often better. The cured liner is seamless and root-resistant, and it is designed to last 50 years or more with a structural warranty.

In the large majority of cases, yes — usually 30 to 50 percent cheaper once you account for excavation and restoration. The exception is a fully collapsed pipe, where replacement may be the only option.

Yes. Relining seals the cracks and joints that roots invade through, creating a smooth surface roots cannot penetrate — which is why it is the permanent fix for repeat root blockages.

A CCTV drain inspection. It is the only way to confirm the condition of the pipe and therefore the right repair. Relining suits cracked, leaking or root-invaded pipes that are still mostly intact; replacement is for pipes that have fully collapsed or severely deformed.

Not Sure Whether to Reline or Replace?

Water Serpent Plumbing diagnoses and repairs damaged drains across Melbourne's Ranges and eastern suburbs — Ringwood, Croydon, Ferntree Gully, Lilydale, Mooroolbark and surrounds. We run the camera, show you exactly what's happening, and give you an honest, fixed-price recommendation.

Call Jack direct on 0425 226 636 for a same-day assessment, or reach out via the contact form below.