A CCTV drain survey is a camera inspection of the inside of an underground drainage system, carried out without any excavation. It produces a written report setting out every defect found and what should be done about each one.
This document is the only part that a solicitor, insurer, mortgage lender, or building control officer will accept as evidence. A drainage survey without a properly coded report will leave you with footage you cannot use.
What is a CCTV drain survey?
A CCTV drain survey is an inspection in which a certified surveyor feeds a camera directly into the drain, producing real-time footage of its condition from the inside. It is the only way to see the conditions inside a pipe without digging it up.
Using the images and footage from the survey, a drainage engineer can identify what’s causing your drains to block, along with the problems that haven’t arisen yet but will in time. They can recommend how best to resolve the issue and restore normal drainage function with the least disruption and expense.
A CCTV drain survey provides peace of mind. Every observation is recorded against the WRc Manual of Sewer Condition Classification, which means a properly produced report reads the same way to a drainage surveyor, an insurer, and a water authority.
What does a CCTV drain survey involve?
For a standard residential property, the survey takes a morning at most, and very little is required from you beyond access. Our CCTV drain surveys in London follow the same sequence whether the property is a terraced house in Hackney or a commercial site in the City.
An engineer arrives at the agreed time with a full range of tools and equipment. Before anything is set up, we discuss the situation with you. This includes what you’ve noticed, when the problem started, and which parts of the property are affected.
The camera then goes into the drain, usually through a manhole, inspection chamber, or rodding eye. Depending on the layout, we use remote-operated crawlers, sonar units, and flexible access rods to push the camera through the system and navigate tight turns and corners. Our engineers use XTI cameras, which produce footage clear enough to classify a defect, rather than just confirm that something is wrong.
As the camera travels, the engineer observes and logs everything it passes: damage and blockages, collapsed sections, tree root ingress, displaced joints, and evidence of poor installation. The findings are then recorded and returned to you as a written report.
How long does a CCTV drainage survey take?
A standard residential property may take around two hours to survey. Larger or more complex drainage systems take longer, and a line that needs clearing before the camera can pass through it will add extra time to the process on the day.
The report is a separate matter and doesn’t come back with the engineer. Ours are produced in PDF format and delivered within 48 hours of the survey being completed. If you’re working to a deadline, whether that’s an exchange date or a building control submission, tell us when you book, and we will work to it.
How much does a CCTV drain survey cost?
A CCTV drain survey on a standard residential property costs between £250 and £650. Where you sit within that range depends on the number of drain runs inspected and the level of reporting required. Larger commercial sites and surveys that call for detailed drainage mapping sit above this cost range.
The report is included in that figure rather than charged separately, and we give you a clear quote before any work begins, with a breakdown of what is covered.
Several things can impact the price within the standard range:
- The number of manholes, inspection chambers and drain runs – More access points mean more pipework to survey and more to document.
- The size of the property and the complexity of its layout – A Victorian conversion with shared runs takes longer to work through than a modern semi.
- Whether the line needs clearing first – A camera cannot see through standing water or a fully blocked drain, so jetting may be needed before the survey can proceed. Drain jetting typically costs between £70 and £180.
- Whether you need a sonde trace and a site plan – Locating and plotting the route of the drain, rather than just inspecting its condition, is additional work.
- Whether the property is domestic or commercial – Commercial sites tend to have larger, older, and less accessible systems.
Whether that money is well spent depends on the total costs you would otherwise be guessing at. If you’re buying a property, £250 to £650 is a small fraction of a London purchase price, and the report either confirms the drains are sound or hands you documented evidence to negotiate with. If you have a drain that keeps blocking, the alternative to a survey is paying to clear the same pipe repeatedly without ever addressing the cause.
If there is a case where a survey is poor value, we would rather say so. For example, if you have had a single blockage with an obvious cause and no history of trouble, clear the drain first and see whether it recurs. A survey earns its fee when there is a pattern to explain, a decision to make, or a document you need to produce for somebody else.
When do you need a CCTV drain survey?
Some surveys are booked because a solicitor, water authority, or insurer has asked for one. Most are booked because something is going wrong and the cause is not visible from above ground. The most common situations we’re called out to tend to involve:
Buying a property
A standard building survey covers the structure, the roof, and the walls, but the drainage system is rarely inspected in any meaningful depth. Drainage problems that go undetected before exchange become your responsibility the moment you sign.
Having the drains surveyed beforehand gives you documented evidence of their condition, which you can use to make an informed decision, support a price negotiation, or satisfy a request from your solicitor, mortgage lender, or insurer. This is why our home buyers drain survey is built around transaction timelines.
If you are extending rather than buying, you will need a build over drainage survey, and we have covered when a build over survey is required separately.
Water draining slowly
A bath or sink taking longer than it should to empty means there may be a partial blockage. Slow drainage shows that a restriction exists without telling you where it is or what has caused it. A survey answers both, which is the difference between clearing a drain and fixing it.
Standing water
Water that isn’t draining usually indicates a full blockage or a collapsed section of pipe. A survey establishes which one you’re dealing with and how far the damage extends, so the repair can be scoped rather than estimated. Where a collapse or a crack is confirmed, drain lining may resolve it without excavation.
Persistent smells from the drains
Grease, food waste, hair, soap scum, and sanitary products build up in kitchen and bathroom pipework until waste stops moving through it properly, at which point foul odours travel back up the system and into the property. A survey shows where the build-up has formed and how much there is, which determines whether the answer is jetting, descaling, or a drain repair. Masking a smell without finding its source only delays the same problem.
Suspected rats
Scratching noises in the walls or loft, droppings, and rub marks along skirting boards all point to a rodent problem, and in our experience, most London infestations originate in the drains. Rats get in through cracked and displaced pipework and travel up from there. A survey identifies the defect giving them access so it can be sealed, which is why our rat control work starts from a survey rather than from laying bait.
Preventative maintenance
Most surveys follow a symptom, but drainage systems take a great deal of punishment, and there is a case for inspecting them before anything has gone visibly wrong. Landlords, managing agents, and owners of older properties can benefit from this the most. A routine survey flags deterioration while it is cheaper to address (for example, lining a hairline crack will cost a fraction of the collapsed drain repair it will need if it is left for another five winters).
What a CCTV drain survey can and cannot find
A CCTV drainage survey can identify a range of issues, including:
- Collapsed drains
- Cracks and fractures
- Displaced joints
- Tree root ingress
- Blockages and deposit build-up
- Animal intrusion
- Leaks and burst sections
- Misconnections
- Evidence of poor original installation
It also establishes pipe material, diameter, flow direction, and the length of each run, which matters when the findings need to be acted on.
There are also some limits that are worth knowing about before you book a CCTV drain survey – for example:
- A camera cannot see through standing water or a completely blocked line, so a badly obstructed drain must be cleared before it can be surveyed properly.
- A chamber that cannot be safely accessed cannot be inspected, which occasionally happens with shared or buried access points on older properties.
- While a survey frequently identifies defective drains as a contributing factor in subsidence, it establishes the condition of the pipework rather than diagnosing the movement of a building on its own.
What you get in a CCTV drain survey report
The report is the deliverable, and ours is produced by certified drainage surveyors using WRc-approved reporting software, including Viewline and Wincan. It complies with the Manual of Sewer Condition Classification 5th Edition, the national standard for classifying drain and sewer defects in the UK.
Every report covers the full drainage layout, including a plan showing the system configuration, pipe materials, pipe diameter, flow direction, drain usage, connections, and the length of each run surveyed.
Defects identified during the survey are documented with their location, condition classification, and severity, rather than described loosely. High-clarity images are supplied alongside the written findings, so you can see the condition of the drains for yourself.
There is then a findings and recommendations section, setting out what we found, what it means in practical terms, and the most appropriate next step, whether that’s routine maintenance, a targeted repair, or no immediate action at all. Where drain mapping and tracing or manhole chamber surveys have been carried out, those findings form part of the same pack.
Because all findings are recorded using standardised defect coding, the report is structured in a way that insurers, solicitors, mortgage lenders, water authorities, and building control officers will accept without further explanation.
An engineer will also talk you through the findings once the report is produced. For surveyors, architects, and facilities managers, we can go into the technical detail and advise on how the report supports a planning submission, an insurance claim, or a stakeholder presentation.
Book a CCTV drain survey in London
We cover every London borough and the Home Counties for residential, commercial, and industrial properties. Our engineers are certified through the National Association of Drainage Contractors and EU Skills in CCTV surveying, high-pressure water jetting, electro-mechanical cleaning, and drain lining.
To book a CCTV drain survey, call 0208 594 7171 or email info@london-drainage.co.uk.
Our team will take a few details about the property and give you a clear quote alongside available booking slots. If you’re working to a deadline or a building control date, tell us when you get in touch, and we will fit the drain survey around it where we can.