Question 1

Does no-dig drain repair actually work?

Accepted Answer

Yes. Cured-in-place pipe (CIPP) relining has been the mainstream sewer repair method across UK water companies since the 1990s and is the default for Thames Water, Severn Trent and Anglian on lateral and main repairs. The liner is a felt or fibreglass sock impregnated with epoxy or silicate resin, inverted or pulled into the existing pipe and cured in place by hot water, steam or UV light. Once cured it forms a structural pipe-within-a-pipe to BS EN 13380, fully load-bearing and sealed at every joint. Independent WRc Manual of Sewer Condition Classification testing routinely returns relined runs at grade 0 or 1 — better than most original clay or pitch fibre installations.

Question 2

How long does drain relining last?

Accepted Answer

The BS EN 13380 type test demands a minimum 50-year design life for every CIPP system sold in the UK, verified by accelerated ageing under load. In practice the earliest large-scale UK relining schemes were installed in the mid-1980s and the WRc Sewer Rehabilitation Manual now references documented field installations still serving at 35+ years with no observable degradation. ERL backs every lined section with a 10-year workmanship guarantee covering bond failure, wrinkle and end-seal issues. The resin matrix itself does not corrode, the felt or glass carrier does not rot, and tree roots cannot re-enter a sealed liner.

Question 3

How does drain relining compare in cost to a full dig?

Accepted Answer

On a typical 15-20m London lateral run, no-dig relining works out at roughly 35-55% of the cost of open-cut replacement once you account for excavation, reinstatement, traffic management and disposal. A 20m CIPP reline at £3,200-£5,400 compares with £8,000-£14,000 for a comparable open-cut replacement, particularly where the run sits under a driveway, paved patio, garage floor or listed building. Add in the lost time waiting for paving and resin-bound reinstatement to cure and the no-dig method usually wins on both price and disruption.

Question 4

Are the trees safe during root cutting?

Accepted Answer

Yes. Cutting roots inside a drain run does not kill the parent tree because only the fine feeder roots that grew inside the pipe are removed — the tree's main structural and water-uptake root system in the surrounding soil is left intact. Tree Preservation Order (TPO) compliance is straightforward because no excavation, root-zone disturbance or canopy work takes place. We do not cut tree roots outside the drain. If the tree is genuinely the source of repeat issues we install an external root barrier between the tree and the run as a permanent solution that protects both the drain and the tree.

Question 5

Does the liner stop roots permanently?

Accepted Answer

Yes. A correctly installed CIPP liner forms a continuous, joint-free internal surface across the run. Roots get into clay and pitch fibre drains through hairline cracks, open joints and porous wall material — none of which exist in a cured liner. The epoxy or silicate resin matrix is non-porous, the felt or fibreglass carrier is encapsulated, and the end seals are mechanically clamped at each manhole. Once the relined section is signed off on post-CCTV survey at WRc grade 0 or 1, roots have no entry point. Future regrowth simply meets the smooth liner surface and is diverted along the flow.

Question 6

How long does the relining job take on site?

Accepted Answer

A typical single-day London install runs 6-10 hours from arrival to post-CCTV sign-off. Jetting and pre-survey takes 60-90 minutes, robotic cutting 30-90 minutes depending on root mass, liner preparation 30-60 minutes (resin impregnation), inversion or pull-in 15-30 minutes, cure time 1-4 hours depending on cure method, lateral reinstatement 30-90 minutes, post-CCTV 30 minutes. UV-cured liners on shorter runs can be completed in under 4 hours. Hot-water-cured longer runs are usually done in a single day.

Question 7

What pipe materials and diameters can be relined?

Accepted Answer

All standard UK domestic drainage pipe materials are relinable: vitrified clay, pitch fibre, cast iron, asbestos cement, concrete and uPVC. Diameter range typically covers 75mm to 600mm, which encompasses every residential lateral, soil stack and shared private sewer in London. Pitch fibre is a particularly strong candidate because pitch fibre delaminates progressively from the inside out and a structural CIPP liner stops the failure mechanism completely. Older Victorian clay drains across central London inner boroughs are the most common reline customer.

Question 8

Do you need access to my property?

Accepted Answer

Only to your manhole or rodding eye — not to your garden, driveway or floors. The robotic cutter, jetter and liner inversion unit all work through existing chambers. Surface vehicles need to park within hose distance (around 30m) of the chamber, which on most London streets means a single vehicle outside the kerb. Where parking is restricted (red routes, controlled parking zones) we apply for the relevant Council suspension or skip permit in advance. Inside the property no internal access is required for a standard external lateral reline.

Question 9

What is the difference between patch repair, partial liner and full reline?

Accepted Answer

Patch repair (£450-£850) is a single localised liner up to about 1m, used for an isolated defect on an otherwise sound pipe — one cracked joint or one displaced socket. Partial liner (£950-£1,650 for up to 5m) covers a longer defective section, typically where roots have entered at two or three adjacent joints. Full reline (£180-£280 per metre, typically £3,200-£5,400 for a 20m run) is end-to-end manhole to manhole, used where the whole run shows multiple defects, delamination, ovalisation or porous walls — the standard solution for failing Victorian clay or 1950s-60s pitch fibre installations.

Question 10

Is the liner approved by water companies?

Accepted Answer

Yes. Every CIPP system we install is on the WRc Manual of Drainage Repair Techniques approved list and carries a current BS EN 13380 type test certificate covering structural performance, watertightness and durability. This is the same regulatory framework Thames Water requires for any rehabilitation work on their public network, so if your run subsequently transfers to the public sewer it remains fully compliant. ERL holds Thames Water Section 50 / Section 104 method statements on file and can co-ordinate adoption documentation where the lined section crosses the public-private boundary.

Question 11

Can you reline a collapsed drain?

Accepted Answer

If the drain is fully collapsed (CCTV grade 5 with full cross-section loss) it cannot be relined directly — the liner needs an existing pipe wall to take its shape. In that case we excavate and replace only the collapsed metre or two, then reline the rest of the run if other sections are also defective. Partial collapses, ovalisation up to about 10% and severe root intrusion are all still reline candidates. A pre-survey CCTV is the only reliable way to confirm which sections are recoverable. We never quote relining sight unseen.

Question 12

What guarantee comes with the work?

Accepted Answer

Every lined section is covered by a 10-year ERL workmanship guarantee for bond failure, wrinkle, end-seal leak and material defect. This sits on top of the BS EN 13380 minimum 50-year design life of the liner system itself. A printed certificate is issued with the post-installation CCTV report and is transferable to subsequent property owners — useful at sale. ERL is a limited company (Co. No. 17120057) with £5m public liability and £2m product liability insurance.

Question 13

Will I lose use of my drains during the work?

Accepted Answer

For a standard single-day domestic reline you should plan to avoid heavy water use (washing machine, dishwasher, multiple baths) during the cure period — typically 2-4 hours. The toilet and sinks can be used in moderation as the liner cures because flow simply runs over the curing surface, but we ask households to minimise usage to give the resin a clean cure. Commercial properties that cannot lose drainage during trading hours are scheduled out-of-hours, usually overnight, at a small premium.

Question 14

Do you carry out the CCTV survey yourself?

Accepted Answer

Yes. Every reline starts with a WRc-coded CCTV survey carried out by our own crew with a Pearpoint P350 Flexitrax or equivalent push/crawler camera. The footage is supplied to you as MP4 with a written report identifying every defect against the WRc Manual codes (CR cracks, OJM open joints, DH displaced sockets, RT root intrusion etc.). After the reline a second post-cure CCTV is run on the same equipment so you have before-and-after evidence on the same scale. Both surveys are included in the relining price.

Question 15

What standards do you work to?

Accepted Answer

BS EN 13380:2011 — the European structural standard for cured-in-place pipe linings — for the liner system itself. WRc Manual of Drainage Repair Techniques (4th Edition) for installation methodology. WRc Manual of Sewer Condition Classification (5th Edition) for pre and post CCTV coding. Building Regulations Part H for any newly built or replaced sections of the run. Sewers for Adoption (8th Edition) where the work touches an adopted lateral. All technicians hold City & Guilds 6028 Drainage Operative qualifications and EUSR confined-space tickets.

Service	What's Covered	Typical Cost
Robotic root cutting (per visit)	High-torque rotary cutter run on a single drain run, roots and scale removed, post-clear CCTV.	£180–£320
CCTV pre-survey + condition report	WRc-coded survey, DVD/MP4 footage, written report on liner suitability and pipe grade.	£180–£280 (credited against relining)
Patch repair (localised liner up to 1m)	Single-defect repair on a cracked or displaced joint. Silicate or epoxy resin, ambient cure.	£450–£850
Partial CIPP liner (up to 5m)	Felt-and-resin liner inverted from manhole, hot or UV cured, BS EN 13380 compliant.	£950–£1,650
Full CIPP relining (per metre)	Continuous structural liner across the run. WRc-approved felt/glass + epoxy. Includes pre & post CCTV.	£180–£280 /m
Complete drain reline (typical 20m run)	Common London terraced run — manhole to boundary. All in: cutting, lining, cure, post-CCTV.	£3,200–£5,400
Root barrier installation	Physical root barrier set externally to keep regrowth away from the lateral.	£250–£550
Lateral junction reinstatement (robotic)	Robotic cutter re-opens branch connections after liner installation.	£220–£420 per junction

Drain Relining London — Root Cutting & No-Dig CIPP Repair

What is no-dig drain relining?

When you need root cutting and when you need relining

Drain relining cost London — 2026 pricing

What's included in every reline

How a no-dig reline works on site

CCTV survey & quote

Jet, descale, root cut

Liner impregnation & install

Cure & lateral reinstatement

Post-CCTV & sign-off

Standards and regulatory framework

Real London relining jobs

Victorian terrace, Camden — root mass in clay lateral

Edwardian semi, Wandsworth — joint displacement on 150mm pitch fibre

Block of flats, Hackney — recurring kitchen blockages

Suburban detached, Bromley — driveway over the run

Commercial restaurant, Westminster — grease + scale + root cut

Conservation street, Islington — listed terrace, no excavation permitted

Why London property owners choose ERL for relining

Areas covered across London

Drain relining FAQs

Book your drain reline today

Service area — all London boroughs

Drain failing? No-dig CIPP repair across London.

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