Drain relining repairs a damaged underground pipe from the inside. A resin liner is inserted into the drain, cured in place and checked so the old pipe has a strong new inner wall. If you are asking what is drain relining, the practical answer is simple: it can fix cracks, leaks, open joints and root damage without digging up your drive, garden, patio or floor unless excavation is genuinely needed.
For Kent and Surrey homeowners, this matters because many properties have older pipework, mature trees, hard standing drives and tight access points. Digging can add reinstatement costs before the pipe repair is complete. A no-dig option can keep the surface intact and help you decide from CCTV evidence, not guesswork.
If your drain keeps blocking, smells foul, drains slowly or has been flagged in a house survey, call 0800 654 6065. We can inspect the problem, explain the findings, and tell you whether relining is suitable before you commit.
What is drain relining and when does it work?
Drain relining is an internal pipe repair. Instead of removing the old drain, the damaged section is cleaned, surveyed, and lined with a flexible resin material. Once cured, the liner forms a smooth, sealed layer inside the existing pipe.
It works best where the drain still has enough structure to support the liner. Common examples include:
- Cracked pipe sections
- Open or displaced joints
- Small leaks
- Root intrusion after roots have been removed
- Repeated blockages caused by rough internal pipework.
It is not the right answer for every drain. If the pipe has fully collapsed, lost its shape or has severe misalignment, excavation may still be safer. The first decision should not be “line or dig”. It should be “what does the camera show?”
How does no-dig drain repair save money?
No-dig drain repair can save money because traditional excavation often includes breaking concrete, lifting block paving, removing planting, digging near services, replacing the pipe, backfilling and reinstating the surface.
| Repair factor | Drain relining | Excavation and replacement |
| Surface disruption | Low, uses existing access where possible | High, ground must be opened |
| Reinstatement | Often avoided | Often required |
| Time on site | Usually shorter | Usually longer |
| Best for | Cracks, joints, leaks, root damage | Collapse or severe deformation |
| Cost risk | Pipe length, access and condition | Labour, depth, spoil removal and reinstatement |
A good drain repair starts with evidence, because the right survey can show whether the pipe can be repaired from the inside.
Why should a CCTV drain survey come first?
A CCTV drain survey shows what is happening inside the pipe. It can confirm whether the issue is a crack, root intrusion, scale build-up, joint defect, a dip, a collapse, or a blockage. Without that evidence, a homeowner may pay for clearance when the real issue is structural or approve excavation when relining would have worked.
Our process starts with a survey, then we identify the affected section, agree on the repair, and carry out final checks after the liner cures. We use CCTV technology, reporting, and video evidence to make the decision visible. We also carry out inspections and flow tests after lining, so the repair is not left to guesswork.
What affects drain relining costs?
Drain relining cost depends on pipe length, diameter, depth, access, cleaning required, whether roots need removing first and whether the drain needs a patch repair or a longer liner.
A short patch repair for one defect will usually be priced differently from relining for a longer run. A deep drain under a driveway may also need more time and equipment than an accessible chamber in a garden. A fair quote should be based on survey evidence, not a vague description of “damaged drains”.
Can drain lining stop tree roots coming back?
Drain lining can help prevent roots from re-entering through the same crack or open joint, but roots must be removed first. Tree roots are attracted to moisture. Once they find a weakness, they can grow into the pipe and trap debris.
The correct sequence is inspection, clearance, root cutting where needed, then relining if the pipe is suitable. If roots are part of the problem, drain root removal should come before the liner is installed. If the pipe is not suitable for lining, we will explain the alternative rather than forcing the wrong repair.
When should Kent and Surrey homeowners consider drain repairs?
Homeowners should consider professional drain repairs when the same blockage keeps returning, a bad smell persists, water drains slowly from several fixtures, a survey flags an underground defect, or there are damp patches around the drain route.
For urgent flow problems, blocked drains may need clearing first. If the blockage is caused by a structural fault, drain lining repair may be the next step. For property purchases, a CCTV drain survey can give buyers evidence before exchange. For recurring issues, planned drain maintenance can reduce the chance of a small defect becoming a disruptive repair.
We work across London, Kent, Surrey, Sussex and the South East, with a Sidcup base and more than 15 years of combined drainage experience. Our app-based reporting helps customers track work, receive updates, and see the evidence behind the recommendation.
How to decide whether relining is the right choice
Use this checklist before approving the work:
- Has the drain been inspected with CCTV?
- Has the damaged section been clearly identified?
- Does the quote explain patch lining or longer relining?
- Has the contractor explained why excavation is not needed?
- Are final CCTV checks or flow tests included?
- Has root removal, cleaning or blockage clearance been allowed for?
This protects you from paying for the wrong fix. A detailed quote supported by survey footage gives you a clearer understanding of the proposed repair.
A less disruptive way to protect your drains
Drain relining is not a shortcut. It is a measured repair method for the right type of damage. When the pipe condition, access and defect location make it suitable, it can avoid digging, protect expensive surfaces and reduce the disruption that homeowners often fear most.
The safest way forward is evidence first. Find the defect, confirm the pipe condition, choose the repair, then check the results.
For clear advice, call 0800 654 6065 or email info@sedrainage.co.uk. We will assess the problem, explain your options and recommend the most practical repair for your property.
Frequently Asked Questions
What is drain relining?
A no-dig method of repairing a damaged drain from the inside by curing a resin liner within the existing pipe.
Is drain relining cheaper than digging?
It can be when the drain is suitable because it may avoid excavation, spoil removal, and surface reinstatement.
Can all drains be relined?
No. Fully collapsed, badly deformed or severely misaligned pipes may need excavation.
Do I need a CCTV drain survey first?
Yes. CCTV confirms the defect, location, and pipe condition so the right repair can be chosen.
