Buying a Home? Why a CCTV Drain Survey Is Worthwhile

A standard property survey rarely shows the inside of underground drainage. A CCTV drain survey can reveal defects that are expensive and disruptive to discover after completion.

The symptom is the starting point rather than the answer. Record when it happens, what else changes at the same time and whether the condition is getting worse. Those details help separate a local fitting fault from a wider supply, drainage or heating problem.

What the symptoms can tell you

Drain faults are easiest to diagnose when you look at the pattern rather than the mess alone. One slow fitting usually points to a local restriction; several affected fittings, a gurgling toilet or wastewater appearing at a low-level drain suggests the problem may be farther along the system.

What the survey should cover

• Confirm which drains are private, shared or adopted. Note which fixtures are affected and whether the result lasts. That evidence indicates whether the action addressed the cause or only moved the restriction.
• Record cracks, displaced joints, roots, deformation and standing water. Recurring symptoms need structural evidence. A CCTV survey can locate joints, deformation and root entry so clearing and repair are not confused.
• Locate defects from the surface and estimate the affected length.
• Ask for video, still images and a plain-English report.
• Use evidence to plan repairs or inform negotiations before exchange.

A safe way to narrow down the cause

1. Work out whether one trap, one branch or several fixtures are affected; that distinction helps locate the restriction.
2. Ask whether neighbours have symptoms too, because a shared or public sewer fault may need the sewerage company.
3. Record odours, noises, water levels and the weather conditions instead of repeatedly forcing water through the system.
4. Use only a simple, non-destructive first measure that suits the fitting, and stop if it does not improve flow promptly.
5. For recurring faults, request diagnosis such as CCTV or root-cause testing before agreeing to excavation or lining.

Common mistakes to avoid

• Treating repeated clearing as a permanent repair when roots, displacement or collapse may be present.
• Putting hands into contaminated water or an inspection chamber without suitable controls.
• Mixing different drain chemicals or using chemicals after a product has already failed.
• Continuing to flush toilets or run appliances while wastewater is backing up.

UK context and safety

Older properties with clay or pitch-fibre drains, extensions built over pipework, mature trees or a history of blockages merit particular attention.

Wastewater can contain harmful microorganisms. Keep children and pets away, avoid direct contact, ventilate the area and wash thoroughly after any minor clean-up. Never enter a drain, sewer or confined chamber. Ownership also matters in England and Wales: the sewerage company usually maintains public sewers and many lateral drains, while the property owner is normally responsible for a drain serving only that property within its boundary.

Prevention and ongoing care

Once the immediate fault is understood, use the findings to reduce the chance of a repeat.

• Keep wipes, sanitary products, food scraps, fat and building waste out of the drainage system.
• Deal with slow flow early and note whether the same branch has needed previous attention.
• Keep accessible gullies and grates free of leaves without pushing debris into the pipe.
• Use planned CCTV inspection where a property has recurring blockages, mature trees or known old clay drains.

Useful UK guidance

• Ofwat: public and private sewer responsibilities

When to call PHD24

PHD24 provides CCTV surveys and can explain whether a defect needs monitoring, repair or urgent action.

A useful drainage visit should do more than restore flow. The engineer should confirm the likely location, explain whether the symptom suggests a blockage or structural fault, and recommend CCTV, jetting, repair or monitoring only where the evidence supports it.

Call promptly if water cannot be isolated, wastewater is entering the property, heat or hot water has failed in vulnerable circumstances, or the fault involves gas, wet electrics or a risk to the building. For a non-urgent visit, photographs and a short history help PHD24 plan the right first attendance.