A CCTV drain survey is an inspection of your drainage system using a small waterproof camera fed through the drains. It produces a video recording and a written report identifying blockages, cracks, collapses, root intrusion, displaced joints, misconnections and other defects that can’t be detected from the surface. CCTV drain surveys are commonly used before buying a property, to investigate recurring blockages, to support insurance claims, and ahead of significant home renovations.
The drainage system is one of the few parts of a property that a standard home survey can only inspect superficially. A surveyor lifts the manhole covers and reports on what’s visible, but everything between manholes (where most of the issues actually occur) remains hidden. A CCTV survey is the only way to see inside.
CCTV drain survey at a glance
| Feature | Detail |
| What it inspects | Internal condition of drains and sewers |
| Equipment used | Small waterproof camera on a flexible rod |
| Typical duration | 1 to 2 hours on-site |
| Output | Video footage, written report, drainage plan |
| Identifies | Blockages, cracks, collapses, root intrusion, displaced joints, misconnections |
| Typical cost | £150 to £300 |
| Carried out by | Specialist drainage engineer or qualified surveyor |
What a CCTV drain survey shows
The camera produces a continuous video record of the inside of the drain, narrated by the operator. The report covers:
- Blockages. Build-ups of grease, wipes, sediment or debris.
- Cracks and fractures. Damage to the pipe wall, which may be allowing groundwater in or wastewater out.
- Collapses. Sections where the pipe has lost structural integrity.
- Root intrusion. Tree and shrub roots penetrating joints, a leading cause of recurring blockages.
- Displaced or open joints. Where pipe sections have moved apart.
- Misconnections. Foul water connected to surface water drains (or vice versa), which is a common issue in older properties.
- Pipe material and diameter. Sometimes properties have a mix of clay, plastic and pitch fibre that affects long-term performance.
- Layout. A drainage plan showing how the system actually runs, which often differs from older deed plans.
When you need a CCTV drain survey
There are five clear scenarios.
1. Before buying a property
This is the most common use case. Drainage defects are expensive (£3,000 to £15,000+ to put right) and not picked up by a standard home survey. Buyers of older properties, properties with established trees, and properties in areas with known drainage issues should strongly consider a CCTV survey alongside their Level 2 or Level 3. See our guide on whether you need a CCTV drain survey before buying.
2. Recurring blockages
If you’re clearing the same blockage repeatedly, the cause is structural, not behavioural. A CCTV survey identifies the root cause (often literally a root), allowing a targeted repair rather than another temporary clear.
3. Suspected leaks or damp
Where a property has persistent damp, sinkholes, soft patches in the garden, or unexplained water on a wall, a defective drain is a common cause. A CCTV survey is the cleanest way to confirm or rule it out.
4. Insurance claims
Insurers often require CCTV evidence before approving a drainage claim, particularly where subsidence or escape of water is involved.
5. Home renovations
Before excavation, building over drains, or substantial extensions, a CCTV survey confirms what’s underground. Building over a drain without approval (a Build Over Agreement) can cause expensive problems later.
What CCTV surveys identify that home surveys miss
A standard Level 2 home survey inspects the drainage system superficially. The surveyor lifts accessible manhole covers, notes the apparent condition and flow, and reports on visible features. Most drainage defects exist between manholes and are invisible from the surface.
| Defect | Visible from manhole? | Visible on CCTV? |
| Surface debris | Yes | Yes |
| Slow flow | Sometimes | Yes |
| Cracks in pipe wall | No | Yes |
| Root intrusion | No | Yes |
| Pipe displacement | No | Yes |
| Collapsed section | Only if severe and adjacent to chamber | Yes |
| Misconnections | No | Yes |
This is why CCTV surveys are increasingly the standard recommendation for buyers of any property over 30 years old, or any property where the standard home survey has flagged drainage concerns.
What the report includes
A typical CCTV drain survey report includes:
- Camera footage of every inspected drain run
- Written commentary identifying each defect and its location
- Severity grading for each defect
- Recommended remedial action and approximate cost banding
- A drainage plan showing the layout of the system
For buyers, this becomes a useful negotiation document. Where significant drainage defects are identified, repair costs can run into thousands, and buyers routinely use survey findings to negotiate the asking price.
Who carries out a CCTV drain survey?
CCTV drain surveys are carried out by specialist drainage engineers using camera equipment, or by surveying firms with in-house drainage capability. The technical inspection is straightforward; the value is in the interpretation of what the camera shows.
Survey Hut is based in Altrincham and carries out CCTV drain surveys across the North West, often alongside a Level 2 or Level 3 home survey for buyers wanting a complete picture.
FAQs
How long does a CCTV drain survey take?
A typical CCTV drain survey for a residential property takes 1 to 2 hours on-site, depending on the size of the property and the length of the drainage runs. The written report is usually returned within 2 to 3 working days.
Is a CCTV drain survey worth it before buying a house?
For older properties, properties with mature trees near drainage, and properties in areas with known drainage issues, yes. Repair costs for serious drainage defects routinely exceed £3,000 and can reach £15,000 or more, so the survey cost is small relative to the risk being managed. Our guide on whether you need a CCTV drain survey before buying covers when it’s worth it.
Will the CCTV survey damage my drains?
No. The camera is small and flexible, fed through existing access points (manhole covers, rodding eyes, gullies). It’s a non-invasive inspection. The drainage system continues to function normally during and after the survey.