Damaged drains rarely announce themselves until something goes wrong: a flood, a collapse or a crack in the wall from subsidence. A drain survey finds the problem while it is still small, so you can fix it on your terms rather than in an emergency.
The Hidden Damage a Leaking Drain Can Do
- Subsidence: water escaping from a cracked pipe can wash fine soil away from under foundations.
- Damp: leaking drains near the house can cause damp walls and floors.
- Sewage flooding: a blocked or collapsed drain can back up into your home.
- Rats: broken pipes let rats in from the sewer; see rats in drains.
What Is Yours to Fix?
Thames Water explains that you are responsible for drains within your property boundary, so long as they serve just your property, while it looks after sewers which you share with your neighbours, even if they are under your garden or driveway. A survey shows exactly where the problem is, which tells you who should pay for the repair.
Prevention vs. Repair
A domestic CCTV survey with Drain 247 starts from £150. Compare that with excavating and replacing a collapsed pipe under a patio or extension, or dealing with an insurance claim for subsidence. Many cracks and root problems found early can be relined or patch repaired without digging.
When a Survey Makes Most Sense
- Buying a home: especially an older property or one with big trees; see surveys before buying.
- Planning building work: to find drains before you dig foundations.
- Recurring blockages: a repeat blockage usually has an underlying cause.
- Cracks or damp: to rule out a leaking drain.
Why Heavier Rain Makes It More Important
The Met Office reports that very wet months in the October to March half-year have approximately doubled in 2016–2025 compared with 1961–1990. Drains with defects are more likely to fail under that extra load.
Frequently Asked Questions
How Often Should I Have My Drains Surveyed?
There is no fixed rule. Survey before buying or building, and whenever you have repeat blockages or signs of damage.
Can a Survey Find the Cause of a Bad Smell?
Often, yes. Smells can come from a cracked pipe, a displaced joint or a dry trap; see slow drains and gurgling sinks.
Book a Drain Survey
Drain 247 is a family-run drainage company serving Watford, Hertfordshire and North West London since 1986. Call 0208 387 5591 or see CCTV drain surveys.
