Comparison
Drain Relining vs Excavation – Which Repair Fits Your Drain?
Relining is not automatically better and excavation is not automatically outdated. They solve different problems. The decision comes from the CCTV footage: what condition the pipe is in, where the defect sits, and what is built above it.
Side by side
How the two methods compare
General tendencies for UK residential drainage. Individual jobs vary.
| Factor | Drain relining | Excavation |
|---|---|---|
| Digging | Usually minimal | Normally required |
| Garden/driveway disruption | Lower | Potentially significant |
| Installation time | Often shorter | Often longer |
| Severely collapsed pipe | May not be suitable | May be necessary |
| Cost | Depends on length and access | Strongly affected by excavation and restoration |
| Property disruption | Usually lower | Usually higher |
Where relining tends to win
- The drain runs beneath a block-paved or resin driveway
- The pipe passes under a patio, conservatory or rear extension
- An established garden, mature planting or a lawn sits above the run
- Access is tight — a terraced property with no side entry, for instance
- The pipe is cracked or jointed poorly but still holds its shape
- You want the work finished quickly with minimal mess
Where excavation is the sensible choice
- The pipe has collapsed or lost a substantial part of its wall
- Deformation is severe enough that a liner cannot seat
- Joints have dropped badly out of alignment
- Sections are missing, or the run has been crushed
- A different pipe route, gradient or a new connection is needed
- The defect sits somewhere no liner can reach reliably
Comparing cost honestly
Relining is frequently the cheaper route overall, but that is not a rule. On a very short, shallow, easily accessible defect in an open lawn, digging can be competitive. What typically tips the balance is reinstatement: lifting and relaying block paving, replacing resin-bound surfacing, rebuilding a patio or re-turfing a garden costs real money, and it is often quoted separately. Ask both types of quotation to state exactly what surface restoration is included.
Length works the other way. Because relining is priced substantially by the metre, a long run can add up, while a single excavation point may be a fixed piece of work. Detailed figures are on the drain relining cost guide.
Practical considerations people forget
- Permissions. Excavation near a boundary, a public sewer or a protected tree may need consent or a build-over agreement.
- Vehicle access. Spoil removal needs somewhere to go; some streets make that awkward.
- Reduced bore. A liner slightly narrows the pipe, which is worth checking on small-diameter runs.
- Combined approaches. Sometimes the sensible answer is to excavate one collapsed metre and line the rest.
- Evidence. Whichever method is used, ask for post-repair CCTV footage.
A reasonable way to decide
Start with a CCTV drain survey, then ask the specialist to explain, in writing, why they are proposing their method and what they saw that ruled the other one out. If the reasoning is clear and matches the footage, you are on solid ground. If a company only ever proposes one method regardless of what the camera shows, get a second opinion.
Next step
Not sure which your drain needs?
Describe the problem and enter your postcode. We help route the enquiry to a specialist servicing your area who can assess whether lining is realistic.
We are an enquiry service, not a drainage contractor. The specialist who receives your enquiry carries out the CCTV survey, quotation and any repair work.