No-dig drain repair — London
Drain relining in London
Cracked, leaking or root-damaged drains repaired without excavation. CIPP drain relining across all 33 London boroughs — no damage to driveways, gardens or floors. 10-year guarantee and post-lining CCTV certificate on every job.
What is drain relining?
CIPP — pipe repair from the inside
Drain relining — formally known as cured-in-place pipe rehabilitation, or CIPP — is a method of repairing a damaged drain from the inside, without digging up the ground above it. A flexible liner tube, pre-saturated with resin, is inserted into the damaged pipe through an existing access point. Once in position, the liner is inflated against the pipe wall and the resin is cured, forming a new, seamless pipe within the old one.
The technology was developed in the UK in the 1970s and has been used in water main and sewer rehabilitation for decades. The same principle now applies to residential drains as small as 100mm in diameter. Modern UV-cured liners can be installed and cured in a single day on a standard terraced house drain run.
The finished liner bonds chemically and mechanically to the host pipe, bridging cracks, sealing joints, blocking root entry points and — in the case of structurally failed pipe — providing independent structural support. Once cured, it is chemically inert, resistant to hydrogen sulphide attack (the main cause of concrete pipe corrosion in sewer environments) and hydraulically smooth.
Why no-dig matters in London
London presents specific challenges that make no-dig drain repair disproportionately valuable compared to other parts of the UK. Drainage in most London streets and properties runs beneath tarmac driveways, block-paved front gardens, poured concrete paths, Victorian mosaic floors, and the roots of mature London plane trees that are often subject to Tree Preservation Orders. Excavating any of these features carries costs and complications well beyond the drain repair itself.
How it works
The drain relining process
CCTV drain survey
Before any relining begins, a push-rod or crawler CCTV camera is run through the pipe to map defects, measure the pipe bore, confirm the pipe material and assess whether relining is the right solution. The survey footage is saved and a written condition report is produced.
High-pressure water jetting
The inside of the pipe must be clean for the liner resin to bond. We jet at up to 4,000 psi to remove root mass, grease, scale, silt and any loose debris. Where roots have grown through joints, we use a root-cutting nozzle before jetting. The pipe is then re-surveyed to confirm it is ready for lining.
Liner preparation and insertion
A felt or glass-fibre liner tube is cut to length, saturated with epoxy or polyester resin, and inserted into the pipe using an inversion drum or pull-in method. The liner is sized precisely to the host pipe bore — too loose and it won't bond, too tight and it won't invert. This step requires no digging; the liner enters and exits through an existing access point such as a manhole or rodding eye.
Inflation and curing
Once in position, an inflatable calibration tube is inserted and inflated to press the resin-impregnated liner firmly against the pipe wall. The resin is then cured — either by ambient temperature (12–24 hours), hot water (2–4 hours), or UV light (30–60 minutes depending on pipe length). UV curing is the fastest and preferred method for residential drains where access is limited.
Post-lining CCTV inspection
After the liner has fully cured and the calibration tube is removed, the CCTV camera runs through the relined pipe again. This confirms the liner has cured correctly, has no voids, and that any lateral connections have been reinstated. We issue a Kingfisher post-lining inspection certificate with both the pre- and post-lining survey footage.
Types of drain lining
Full relining, patch lining and lateral lining
Not every drain relining job is the same. The right approach depends on the number of defects, their location and the overall condition of the pipe. A CCTV survey before any work begins determines which type of lining is appropriate — and avoids paying for full-length relining when a patch repair will solve the problem.
Full-length relining
A continuous liner inserted from one access point to another, covering the entire pipe run in a single pass. Used where multiple defects are distributed along the full length of the pipe or where the pipe condition is generally poor. Most cost-effective per metre when the pipe needs rehabilitation along more than 40% of its length.
£1,200 – £3,500 (residential, London)
Patch lining
A short liner section — typically 500mm to 1,500mm — targeted at a single defect: a cracked joint, a localised fracture, a root entry point. Inserted and cured in the same way as a full liner but covers only the affected section. Fast to install and significantly cheaper than full relining when only one or two defects are present.
£400 – £800 (per patch, London)
Lateral lining
Relining for the connection between a property's internal drainage and the main drain — the lateral junction. Lateral connections are a common failure point, particularly where a 100mm clay branch connects to a 150mm main drain. A robotic cutter and lateral launcher are used to insert and cure a liner at the junction. This is specialist work requiring camera-guided robotic equipment.
From £600 per lateral
All costs are indicative for London residential drainage. Final price depends on pipe diameter, access conditions, pipe length and extent of defects identified in the CCTV survey. We provide a fixed price before any work begins.
What drain relining repairs
Drain defects that relining solves
Drain relining is not the right solution for every drainage problem — but for the six defect types below, it is almost always superior to excavation in terms of cost, speed and disruption.
Root intrusion
Tree and shrub roots enter through hairline cracks or open joints and, over years, fill the pipe with root mass. Relining seals every entry point with a continuous, jointless internal surface that roots cannot penetrate.
Cracked or fractured pipe
Clay pipes crack under traffic loading, ground movement and frost. Hairline cracks become structural fractures over time. A CIPP liner bonds directly to the fractured pipe wall and provides independent structural strength, preventing further deterioration.
Leaking joints
In Victorian clay drainage, spigot-and-socket joints sealed with mortar gradually open as ground moves. Groundwater infiltrates, solids exfiltrate, and the ground surrounding the drain gradually voids out. Relining bridges every joint with a seamless liner, eliminating infiltration and exfiltration in a single pass.
Joint displacement
Mild-to-moderate joint displacement — where adjacent pipe sections have moved laterally but the pipe is not fully collapsed — can be relined provided there is enough clearance for the liner to traverse the offset. Severe offsets (greater than 30% of the pipe bore) usually require local excavation before relining.
Minor collapses
Partial collapses where the pipe is deformed but not fully obstructed can sometimes be relined, particularly in pitch fibre pipes which deform elliptically rather than fracturing. Full collapses — where the pipe cross-section is completely lost — require excavation and pipe replacement before relining can continue.
Pitch fibre deformation
Pitch fibre pipes installed in the 1950s–1970s are notorious for delaminating and deforming under load. The pipe becomes egg-shaped, restricts flow and eventually fails. Drain relining is the most cost-effective solution for pitch fibre pipe rehabilitation, restoring a circular bore and eliminating the underlying material failure.
Honest assessment
When we recommend excavation instead
Drain relining is not universally applicable. A CCTV survey occasionally reveals conditions where open-cut excavation is the only safe option. We will tell you clearly if this is the case rather than attempting a relining job that will not succeed. Conditions that typically require excavation include:
In mixed situations — for example, a pipe run where 80% can be relined but a single collapsed section requires excavation — we often combine both methods: excavate the collapsed section, replace that section of pipe, then reline the remaining run in a single pass. This hybrid approach is almost always cheaper than full excavation.
London pricing
What drain relining costs in London
Drain relining costs in London are higher than national averages due to access constraints, traffic management requirements and the predominantly Victorian drainage infrastructure that requires more thorough jetting preparation before lining. The figures below reflect realistic London market rates in 2025.
Our guarantee
10-year guarantee on every reline
Every drain relining installation we carry out is backed by a 10-year workmanship guarantee. This covers defects arising from the installation itself — liner delamination, voids, failure at the termination ends, or inadequate cure. It does not cover new damage caused by events outside the liner's control: fresh root penetration at a location not covered by the liner, external ground movement, or upstream blockage.
On completion of every relining job, we issue a Kingfisher CCTV post-lining inspection certificate. This document includes a reference number, the pre-lining survey footage reference, the post-lining survey footage reference, the liner specification, the curing method and date, and our engineer's signature. The certificate is transferable to future owners and accepted by mortgage lenders, insurers and Thames Water for adoption submissions.
We can also register the guarantee with a third-party insured warranty scheme on request — relevant for properties being sold, refinanced or transferred to a management company.
What the certificate includes
- Pre-lining CCTV survey footage reference
- Post-lining CCTV survey footage reference
- Liner manufacturer and specification
- Curing method and date
- Engineer's signature and Prestige Engineers reference
- Kingfisher inspection certificate number
Common questions
Drain relining London: frequently asked
How long does a relined drain last?
A correctly installed CIPP drain liner has a design life of 50 years according to independent testing by organisations such as WRc. In practice, the liner bonds to the inside of the host pipe and becomes structurally self-supporting once cured. We back every installation with a 10-year workmanship guarantee and provide a Kingfisher CCTV post-lining inspection certificate so you have independent evidence of the finished condition.
Can you reline any pipe material?
Drain relining is suitable for most common pipe materials found in London properties: vitrified clay (the most common in Victorian-era drainage), PVC, cast iron, pitch fibre, and concrete. The only materials that cannot be relined are those with major structural failure — complete collapse, missing pipe sections, or severe offset joints where the liner cannot maintain contact with the pipe wall. A pre-lining CCTV survey tells us precisely whether a pipe is suitable before any work begins.
Does drain relining reduce the internal bore of the pipe?
Yes, but by a minimal amount. A typical 4mm-wall liner inserted into a 100mm drain pipe reduces the internal diameter by approximately 8mm, leaving a 92mm bore. This minor reduction has negligible impact on flow capacity because the smooth, seamless interior surface of the cured liner actually improves hydraulic efficiency compared to a rough, deteriorated clay pipe with root intrusion. For pitch fibre pipes — which typically have already deformed and reduced in bore — relining restores near-original flow capacity.
Is drain relining guaranteed?
Yes. Every drain relining job we carry out comes with a 10-year workmanship guarantee covering the liner installation itself. The liner materials we use carry manufacturer warranties of 10 years as standard. On completion we carry out a post-lining CCTV inspection and issue a Kingfisher inspection certificate showing the finished internal condition — this certificate is transferable to future property owners and can be used as evidence for mortgage or insurance purposes.
Will Thames Water accept a relined drain for adoption?
Thames Water and other sewerage undertakers will accept CIPP-relined drains for adoption provided the installation meets WIS 4-34-04 (the Water Industry Specification for lining of gravity sewers and drains) and is evidenced by a pre- and post-lining CCTV survey report. We provide the full documentation package required for Thames Water adoption submissions. If your drain is being adopted as part of a new development or a Section 104 agreement, let us know at enquiry stage and we will ensure the specification and paperwork meet adoption requirements.
Get a fixed price
Book a CCTV survey and drain relining quote
Tell us your postcode, the drain access point location and any symptoms you have noticed — slow drainage, subsidence, root blockages, persistent damp. We will assess whether relining is the right solution and provide a fixed price before any work begins.