Drain Relining vs Pipe Replacement: Which Saves You More in the Long Run?

Introduction

If a CCTV inspection has revealed a cracked, root-invaded or partially collapsed sewer line, you have two main options: reline it from the inside or dig it up and replace it. The right answer depends on more than just price — though price is where most people start.

The headline numbers

• Drain relining (per metre): $450–$750
• Drain relining (typical 6–10m residential job): $3,500–$7,500
• Full pipe replacement (excavation): $6,000–$15,000+
• Replacement under driveway/extension: $15,000–$30,000+

Lifespan and warranty

• Modern epoxy reline: 50+ year design life, typically 25-year workmanship warranty
• New PVC pipe: 50+ year life, 10–25 year warranty depending on installer

On lifespan, the two are essentially equivalent. The difference is in disruption, time and cost.

When relining wins

• Pipe is structurally intact but cracked or root-invaded
• Pipe runs under driveways, slabs, decking or established gardens
• You want minimal downtime (usually back online same day)
• You want to avoid landscape reinstatement costs

When replacement wins

• Pipe has collapsed, lost shape, or has a major belly (sag)
• Multiple junctions need reconfiguring
• Pipe is too small for current household demand
• Access for relining equipment isn’t feasible

The real-world maths

Example: Hawthorn double-storey, 1930s home. 8m of cracked clay sewer under a paved driveway.

• Relining quote: $5,200 (1 day, no driveway works)
• Replacement quote: $14,800 (3 days, driveway re-laid afterwards)

Both come with comparable 25-year warranties. The reline saves $9,600 and a week of disruption.

FAQ

Is relining always cheaper?

No. Fully collapsed, severely deformed or undersized pipes usually need replacement. CCTV tells us which camp you’re in.

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