Drain relining is the go-to method for repairing drains cost-effectively and conveniently. But how much should you expect to pay?
If left in disrepair, the cracks and defects in drainage can start to cause problems. This can be anything from leaks and foul smells to more serious problems like structural damage and subsidence.
Drain relining works by adding a protective layer to the inside of the drain. This forms a coating to protect against cracks and other defects.
This article will cover the costs of drain relining, factors that affect the cost, plus other common questions around their use.
Drain Relining Cost Per m²
The prices below are for a straight run (no cuts) drain relining. Prices exclude VAT.
|Pipe Diameter / Service||National Average||Typical Range||Low End - High End|
|100mm||£72 / m²||£60 - £100 / m²||£40 - £110 / m²|
|150mm||£108 / m²||£95 - £120 / m²||£90 - £130 / m²|
Factors Affecting Price
Has a CCTV Survey Been Conducted?
A CCTV survey identifies the exact issue with the piping and its precise location. Only then can a contractor have a better understanding of more specific price calculations.
The costs for the pre-inspection CCTV survey when we conducted this research averaged around £88 extra. However, there are different types of CCTV that have slightly different prices, as seen below.
|Type of CCTV Drain Survey||Average||Typical Range|
|Look & See Survey||£70||£50 - £120|
|Recorded Survey||£90||£60 - £140|
|Full Report & Recorded Survey||£120||£65 - £200|
Site and Vehicle Access
The locations and number of access points or manholes the drains have and how many connections are within the drains.
Number of Lateral Cuts
Once the drain is relined, it usually blocks pipe intersections. Lateral cuts allow the water to flow through the intersection. More cuts increase the price.
Existing Pipe Condition
A contractor will ask the reason for the lining. In combination with the CCTV survey, this gives them a good understanding of the repairs needed.
High-pressure water jetting is then needed to break up debris or other substances are found within, around, or attached to the drain or pipe. This removes blockages and builds to help restore the optimum flow within the pipe.
Overheads and labour costs tend to be higher in the south of England, particularly in London.
If the contractor needs to travel beyond a certain radius, then they may add an extra fee on top. Unless you live in a very rural location or want to use a tree surgeon that operates further afield, you shouldn’t need to pay extra.
What is Drain Relining?
Drain relining is a method of repairing damaged drainage pipes. It does this via a process of fixing a new pipe into an existing one without the use of excavation. This means no digging is required.
It is a highly effective procedure and is a non-destructive way of securing pipework in the home.
It is often used to fix leaking joints or cracks that are caused by blockages, as well as root intrusions. Clay drainage pipes in particular are known to have issues with roots growing into the pipe.
Drain Relining Process
First, a pre-survey is undertaken to inspect the condition of the pipe. This helps locate where the issues are such as potential leaks, root intrusions and any open joints. The contractor can also mark exactly where the liner should start and finish, which is usually manhole to manhole.
The epoxy is mixed with hardeners with the correct ratios. The liner is then laid out and the epoxy is added to the liner. A wet-out process can also ensure that all felt fibres in the liner are saturated with epoxy. The liner is then inserted into the drain and pulled out from the other side.
Then resin solution is mixed with hardeners and get the calculations right so that the resin goes off at the correct time. Lay the liner out, brush the resin on the liner and then pull it through the pipe.
Once pulled through the pipe, inflate inflation hose through it, blow it up to correct pressure and leave it in the pipe to cure. Once hardener, deflate hosing side, pull out and brand new inner liner of a pipe.
A calibration hose is inverted into the new liner using water pressure. This forms a liner into the existing pipe and holds it in position when cured.
Once cured, the calibration hose is removed and the pipe is left. A full post-CCTV survey is carried out and the new pipe is tested several times with water. This CCTV survey is then handed over to the client.
Pros and Cons of Drain Relining
- Little to no excavation necessary, reducing restoration costs for landscape damage
- Easy for hard to access areas where excavation is not ideal
- Minimal disruption and downtime. Jobs can often be completed within a day
- Able to negotiate bends and offset joints
- Many pipe materials can be renovated
- Much longer guarantees compared to new PVC pipes
- Far cheaper than replacing pipelines
- Incorrect installation or materials can mean roots grow back between the host pipe and the relining
- Does not fix low stops or bellies in the sewer pipe
- Does not repair any bad grading of pipe or offset joints in clay piping
- Relining may not be possible in all situation
What to Look for When Hiring a Drain Relining Contractor
When looking for a contractor, ensure they meet the standards set by industry regulators. If the drain relining is installed to WIS (Water Industry Specification) standards, the liner life is 50 years.
Contractors should be able to offer lengthy guarantees and warranties of at least 5 years minimum. Keep in mind that most relining should be able to be completed within a day.
Some of the certifications to look out for when considering contractors for the job include:
- NADC – National Association Drainage Contractors
- WJA – Water Jetting Association
- CHAS – Contractor Health and Safety Assessment Scheme
- Achilles UVDB – Utility Vendor Database (UK)
Get Prices On Drain Relining Near You
We’ve done our best to give you a good idea of what you can expect to pay for drain relining.
However, our guides are not a substitute for a fixed written quote specifically for you.
We work with all the best drain relining experts ready to price your job. Get free, no-obligation quotes in your local area and compare prices using the form below.
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