Tree roots are one of the most common causes of blocked or damaged drains in the UK. They often remain unnoticed for months or even years until they grow large enough to obstruct the pipe or cause a serious leak. By the time the symptoms appear the damage can be extensive, yet many homeowners don’t realise how easily roots can enter a drainage system or how quickly the problem can escalate.
This guide explains exactly how tree roots cause problems, how to spot the warning signs and what you can do to fix and prevent the issue. As a specialist utility contractor, Tiger Utilities has extensive experience diagnosing and repairing root-related drainage damage.
Why Tree Roots Target Drains
Tree roots naturally grow towards sources of water. They are drawn to moisture, nutrients and warm ground that helps them thrive. Drainpipes provide all three. Even a tiny seep from an ageing joint or hairline crack is enough to attract fine root hairs.
Roots do not need an open hole to enter a pipe. They exploit the smallest defects and will push into any gap as they grow. Once inside they expand, thicken and multiply which leads to blockages and structural damage.
How Tree Roots Enter Drains
Roots rarely break through a perfect pipe. They usually take advantage of weaknesses in the system. The most common entry points include:
Weak points in older systems
Many properties still have clay pipes joined with mortar. These joints naturally deteriorate over time and create small gaps where roots can enter. Ground movement, frost heave and general ageing all contribute to these failures.
Modern pipe systems
Plastic drainage systems are more resilient but not immune. Poor installation, slight misalignment or accidental impact can create opportunities for roots to get in.
Other vulnerable access points
- Loose or displaced joints
- Cracked pipe sections
- Inspection chamber walls
- Redundant gully connections or old junctions
Once roots gain access they quickly establish themselves inside the pipe where moisture is abundant.
The Damage Tree Roots Cause
The extent of the damage depends on how long the roots have been growing inside the pipe and how advanced the intrusion is.
Minor intrusion
Early stages involve thin root strands entering through a small defect. They may only cause occasional slow drainage or mild blockages.
Moderate intrusion
Roots develop into dense mats that catch wipes, tissue and debris. This leads to repeated blockages and wastewater backing up inside the property.
Severe intrusion
If left unchecked roots can:
- Fracture or collapse the pipe
- Cause significant leaks or soil erosion
- Create dips or voids in the ground
- Lead to flooding and foul smells
At this stage a full repair or replacement is usually required.
Warning Signs Homeowners Should Look For
Tree root problems often reveal themselves gradually. Common signs include:
- Drains that run slowly or back up repeatedly
- Gurgling noises from toilets or sinks
- Bad smells around manholes or outdoor drains
- Lush or unusually green patches on lawns above the drain line
- Soft spots or dips in the ground
- Regular blockages in the same section of pipe
Any of these symptoms should prompt a professional inspection.
How Tree Root Intrusion Is Diagnosed
Tiger Utilities uses several methods to assess root-related damage:
CCTV drain surveys
A camera system is fed through the pipe to identify root ingress, cracks and structural issues. This provides a clear view of the problem and helps locate the exact entry point.
Dye testing
Coloured dye helps confirm leaks or establish the direction of water flow.
Drain route tracing
Electronic probes and sensors identify the precise route of the drainage system which ensures repairs target the correct area.
What You Can Do About Tree Root Damage
The right solution depends on the severity of the intrusion and the condition of the pipe.
Early-stage treatments
- Mechanical root cutting
- High-pressure jetting
- Application of approved root inhibitors (with consideration for environmental guidelines)
These treatments remove roots and restore flow but do not repair the defect that allowed them to enter.
Medium-stage repairs
- Patch lining or CIPP (cured in place pipe) lining
- Re-sealing joints
- Re-rounding distorted pipe sections
Lining creates a smooth internal surface that blocks root re-entry and extends the life of the drain.
Full replacement
When pipes are badly damaged the only reliable solution is replacement. This can be completed through open excavation or trenchless technologies such as pipe bursting or moling.
Modern MDPE or PVC pipes provide excellent long-term resistance against root intrusion.
Preventing Tree Root Problems in Future
Proactive measures can significantly reduce the risk of root-related damage.
Planting guidelines
- Avoid planting trees too close to drainage lines
- Be cautious with species known for aggressive roots such as willows, poplars and sycamores
- Choose less invasive species for smaller gardens
Maintenance tips
- Arrange periodic CCTV surveys for older drains
- Keep inspection chambers accessible and clear
- Repair minor cracks or displaced joints before roots exploit them
Protective barriers
Root barriers can be installed during landscaping to create a physical separation between tree roots and drainage pipework.
Costs: What Homeowners Can Typically Expect
Costs vary depending on access, depth, pipe material and the severity of the intrusion.
Typical price guide
CCTV drain survey: moderate cost range depending on property size
Root cutting and jetting: usually affordable for early-stage intrusion
Patch lining: mid-range cost depending on length and complexity
Full replacement: higher cost due to excavation or trenchless equipment
Example scenarios
- Minor root intrusion affecting a single joint
- Multiple sections of root damage requiring several liners
- Severe intrusion from a large tree requiring pipe replacement over a long distance
A clear survey and diagnosis ensures homeowners know exactly what work is required and why.
How Tiger Utilities Helps
Tiger Utilities provides a complete service for root-related drain issues, including:
- High-quality CCTV survey equipment
- Skilled engineers trained in drain repair and replacement
- Trenchless installation methods where possible
- Clean and efficient workmanship
- Clear diagnosis, transparent pricing and practical advice
Take Action Now
If you suspect tree roots are affecting your drains, a professional survey is the best first step. Tiger Utilities can identify the problem quickly, explain your options and provide a clear fixed quote for any required work.
Contact us today to arrange your drain survey and protect your home from further damage.
FAQs
Can I use chemical root killers?
Some treatments are available but must be used responsibly. They can offer temporary relief but will not repair damaged pipes.
Will cutting down the tree stop the problem?
Not immediately. Roots can remain active long after a tree is removed.
Are neighbours responsible if their tree caused the problem?
Responsibility depends on property boundaries, ownership and drainage layout. A CCTV survey helps clarify the situation.
Will my insurance cover the repair?
Some policies cover accidental damage to underground services. Homeowners should check their policy wording.
Can roots damage new plastic pipes?
Plastic pipes are resistant but not entirely immune. Proper installation and secure joints are essential.
