What is a Drainage CCTV Survey? Do You Need One When Buying?
A drainage CCTV survey uses a camera to inspect underground pipes for cracks, blockages and root ingress. Find out when it is recommended and what it costs.
Published: 16 Mar 2026 · Updated: 16 Mar 2026 · 5 min read
What Is a Drainage CCTV Survey?
A drainage CCTV survey involves inserting a small waterproof camera into the underground drainage system at the property. The camera travels through the pipes and records footage of their condition, which is then reviewed by a specialist drainage engineer and written up in a report.
The survey covers foul drainage (waste from toilets, sinks and baths) and sometimes surface water drainage (rainwater from roofs and paved areas), depending on scope.
When Is a Drainage Survey Recommended?
A drainage survey is not a standard part of every house purchase, but it is strongly recommended in the following situations:
- The property is more than approximately 30 years old, clay and pitch fibre pipes from this era are prone to fracture, displacement and root ingress
- There have been repeated blockages reported by the seller
- There is a large tree close to the building, tree roots actively seek out moisture and can crack and infiltrate pipes
- There is evidence of ground movement
- The property has had a significant extension, drainage routes may have been diverted or poorly connected
- There are shared drains or a shared sewer running through the property
What Problems Does It Find?
| Problem | Severity |
|---|---|
| Root ingress, tree roots penetrating joints or cracks | Medium – High |
| Fractures or cracks from ground movement or age | Medium – High |
| Displaced joints causing partial blockage | Medium |
| Collapsed pipe, section has failed entirely | High |
| Debris and build-up causing blockage | Low – Medium |
| Incorrect falls, insufficient gradient | Medium |
Shared Drainage and Conveyancing
Since the 2011 Sewers Transfer, most private shared sewers serving more than one property in England and Wales were transferred to the relevant water authority. However, shared lateral drains (the section running from each individual property to the shared sewer) often remain the private responsibility of each property owner.
Your solicitor will commission a drainage search (CON29DW) which shows whether the public sewer is near the property. However, a drainage search is a desktop record check, not a physical inspection, it will not reveal whether the pipes are in good condition.
Typical Costs
| Property Type | Typical Cost |
|---|---|
| Standard 2–3 bed house | £150 – £250 |
| Larger detached or multiple drain runs | £250 – £400 |
What Happens If Problems Are Found?
Minor blockages can often be cleared by high-pressure jetting (£100–£200). Fractures in accessible locations may be repaired by drain lining (no-dig repair) for £500–£1,500. Collapsed sections typically require excavation and pipe replacement, which can cost several thousand pounds.
As with any defect found before exchange, you can use the findings to renegotiate the purchase price or request a retention from the seller's solicitor.
You can check the property's planning history and recorded searches on Property Passport UK before proceeding to a physical drainage survey.
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