GUIDE 04
DRAIN REPAIRS
EXPLAINED
Understanding the different drainage repair options and how we choose the right solution for your property.
Not every drainage problem requires excavation. Modern repair techniques allow many damaged drains to be restored with minimal disruption while providing long-lasting results.
This guide explains the most common repair methods, when each should be used and how we determine the best solution for every drainage system.
IN THIS GUIDE
01 Quick Answer
02 When Do Drains Need Repairing?
03 How We Assess Your Drain
04 What Can a CCTV Camera Condition Inspection Identify?
05 Our Drain Repair Methods
06 Drain Lining vs Patch Repairs
07 When Excavation is Necessary
08 What to Expect During Repairs
09 Aftercare & Guarantees
10 Why Choose Drainsmart?
11 Need Advice About Drain Repairs?
12 Frequently Asked Questions
13 Related Guides
01 Quick Answer
Every drainage problem is different.
We recommend the most appropriate repair by combining the findings from a CCTV Camera Condition Inspection with the condition of the pipework, the location of the defect and the long-term performance of each repair option.
Our goal is always to provide the most effective, cost-efficient and least disruptive solution.
02 When Do Drains Need Repairing?
Drain repairs may be recommended where we identify:
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Cracked or fractured pipes
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Root penetration
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Defective or leaking joints
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Pipe collapses
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Displaced pipework
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Corrosion or deterioration
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Repeated blockages
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Standing water caused by poor pipe alignment
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Water infiltration or exfiltration
Early repairs often prevent more extensive damage and reduce long-term repair costs.
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03 How We Assess Your Drain
Before recommending any repair, we carry out a thorough assessment.
This typically includes:
CCTV Camera Condition Inspection
We inspect the drainage system to identify defects and assess the overall condition.
Condition Assessment
We consider:
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Pipe material
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Structural condition
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Severity of damage
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Accessibility
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Remaining service life
Recommendations
Using this information, we recommend the most appropriate long-term repair solution.
You'll then receive a clear report explaining our findings and recommendations.
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04 What Can a CCTV Camera Condition Inspection Identify?
A CCTV Camera Condition Inspection provides a detailed view of the inside of your drainage system, allowing our engineers to identify a wide range of structural defects, blockages and maintenance issues without excavation.
Depending on the condition of the pipework, we may identify the following:
🚽 Blockages
Build-ups of debris, wipes, grease, roots or other obstructions that restrict or prevent the normal flow of wastewater.
→ Learn more about Blockages
🌳 Root Penetration
Tree roots entering the drainage system through defective joints or damaged pipework, often leading to recurring blockages and structural damage.
→ Learn more about Root Ingress
⚡ Fractures
Cracks or breaks in the pipe wall that may allow water to escape or groundwater to enter the drainage system.
→ Learn more about Fractures
💥 Collapses
Sections of pipe that have failed structurally, preventing normal flow and often requiring repair or replacement.
→ Learn more about Collapsed Drains
🔓 Open or Defective Joints
Pipe joints that have separated or deteriorated, allowing leakage or root penetration.
→ Learn more about Open Joints
↔️ Displaced Joints
Pipe sections that have moved out of alignment, creating an uneven connection that can restrict flow or allow leakage.
→ Learn more about Displaced Joints
🪨 Scale Build-up
Mineral deposits that gradually reduce the internal diameter of the pipe and restrict flow.
→ Learn more about Scale
🛢 Grease Deposits
Accumulations of fats, oils and grease (FOG) that harden over time and contribute to blockages.
→ Learn more about Grease Build-up
🛠 Corrosion
Deterioration of pipe materials caused by age, chemical attack or prolonged use.
→ Learn more about Corrosion
📉 Pipe Deformation
Changes to the original shape of the pipe, often caused by ground movement, loading or deterioration.
→ Learn more about Deformation
💧 Backfalls
Sections of pipe where the gradient has been lost, allowing water to collect instead of flowing freely.
→ Learn more about Backfalls
🐀 Vermin Entry Points
Defects that may allow rodents to enter or travel through the drainage system.
🚫 Redundant Drains
Disused drainage connections that may no longer serve a purpose and could benefit from capping or removal.
→ Learn more about Redundant Drains
🔀 Incorrect Connections
Drainage connected to the wrong system, such as foul water entering surface water drainage, or vice versa.
→ Learn more about Drain Misconnections
🔧 Previous Repairs
Evidence of earlier repair work, allowing us to assess its current condition and ongoing performance.
🧱 Pipe Material
Identification of the drainage pipe material, such as clay, pitch fibre, PVC or cast iron, helping determine its likely lifespan and suitability for repair.
→ Learn more about Pipe Materials
🛡 Structural Lining Condition
Assessment of existing drain liners to determine their condition and whether they continue to provide an effective long-term repair.
Our Role
Every drainage system is different. Our role is to identify what's present, explain its significance and recommend the most appropriate solution based on the evidence, not assumptions.
05 Our Drain Repair Methods
Every drainage system is different, so we offer a range of repair techniques.
Structural Drain Lining
Ideal for restoring structurally damaged pipes without excavation.
Suitable for:
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Cracks
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Leaking joints
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Root Penetration
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Longer damaged sections
Structural Patch Repairs
A cost-effective solution for isolated defects.
Typically used for:
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Individual cracks
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Localised joint failures
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Short damaged sections
Picote Milling
Specialist robotic cutting equipment used to remove:
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Root masses
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Concrete intrusions
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Scale
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Protruding connections
Often carried out before drain lining.
Traditional Excavation
Where pipework has collapsed or is unsuitable for lining, excavation allows damaged sections to be replaced.
Although more disruptive, it is sometimes the most appropriate long-term solution.
Pipe Replacement
Where drainage has reached the end of its service life, replacement may provide the best long-term outcome.
How We Choose the Right Solution
There is no single repair method suitable for every defect.
When making recommendations we consider:
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CCTV survey findings
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Pipe material
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Pipe size
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Structural condition
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Accessibility
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Location of the defect
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Length of damaged pipe
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Long-term durability
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Budget and practicality
Our recommendations are based on providing the best long-term outcome—not simply the quickest repair.
06 Drain Lining vs Patch Repairs
Both techniques repair damaged drains without excavation, but they're designed for different situations.
Patch Repairs
Best suited to:
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Localised defects
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Small cracks
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Single joint failures
Advantages include:
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Lower cost
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Short installation time
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Minimal disruption
Structural Drain Lining
Best suited to:
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Multiple defects
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Longer pipe runs
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General structural deterioration
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Root Penetration
Advantages include:
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Creates a new pipe within the old one
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Longer service life
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Protects the entire lined section
We'll always recommend whichever option provides the best long-term value.
07 When Excavation is Necessary
Although trenchless repairs are often possible, excavation remains the best solution in certain situations.
This may include:
Fully collapsed pipes
Significant pipe deformation
Missing sections of pipe
Severe ground movement
Drainage unsuitable for lining
If excavation is required, we'll explain why and discuss the available options before work begins.
08 What to Expect During Repairs
1
Survey
Confirm the exact defect.
2
Preparation
Clean and prepare the drainage system.
3
Repair
Carry out the agreed repair method.
4
Quality Inspection
Complete a final CCTV Camera Condition Inspection to confirm the repair.
5
Reporting
Provide photographs, CCTV footage (where applicable) and confirmation of the completed work.
09 Aftercare & Guarantees
We stand behind the quality of our workmanship.
Many qualifying repairs include our 15-year workmanship and materials guarantee, giving you confidence in the long-term performance of your drainage repair.
Following completion, we'll also provide practical aftercare guidance to help maximise the life of your drainage system.
10 Why Choose Drainsmart?
Choosing the right repair is just as important as carrying out the repair itself.
At Drainsmart, we've been inspecting and repairing underground drainage systems for over 20 years, helping homeowners, businesses and property professionals throughout London and the South East.
Our engineers are accredited by both DrainSafe and the National Association of Drainage Contractors (NADC), giving you confidence that every recommendation is based on recognised industry standards and extensive practical experience.
Our credentials include:
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DrainSafe Accredited Contractor
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National Association of Drainage Contractors (NADC) Accredited
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Over 20 years' drainage experience
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Fully insured engineers
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15-year guarantee on qualifying lining and repair workmanship and materials
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Honest advice and practical repair recommendations
11 Need Advice About Drain Repairs?
Not sure which repair method is right for your drainage system?
Our experienced team will assess the condition of your drains, explain your options clearly and recommend the most appropriate long-term solution.
Request a quotation today or call us on 02086633699
12 Frequently Asked Questions
Our Drain Repairs FAQ covers:
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Do I need excavation?
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Can my drain be lined?
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What's the difference between patch repairs and lining?
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How long do repairs take?
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What guarantee is included?
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Will I receive CCTV footage?