Buying a home in Bath is not quite like buying anywhere else. The city's Georgian terraces, Bath stone villas and converted period properties are part of what makes it a UNESCO World Heritage Site — and beneath many of them runs drainage as old as the buildings themselves. Before you commit hundreds of thousands of pounds, it is worth asking the question most buyers never think to ask: what condition are the drains actually in?
Your building survey does not cover the drains
This surprises a lot of buyers. A standard RICS homebuyer report or a full building survey assesses what the surveyor can see and reach — walls, roof, damp, timbers — but it does not send a camera down the drains. Below-ground drainage is specifically outside the scope of an ordinary survey. So you can pay for a thorough building survey, get a clean bill of health, and still inherit a collapsed drain the week after you move in.
That gap matters more in Bath than in a city of modern housing, because so much of the stock is old and drains through original pipework.
Why Bath's period pipes carry more risk
Georgian and Victorian houses were plumbed with what was available at the time: glazed clay (earthenware) pipes and, later, cast iron. Both have a long life, but both are now often well past it. The specific risks in Bath's period stock are:
- Cracked and displaced clay joints, opened up by more than a century of ground movement
- Root ingress from the mature trees that line so many of Bath's streets and gardens — roots find the moisture at an open joint and grow straight in
- Cast-iron soil stacks corroding internally, so material clings to the rough walls and slowly builds a blockage
- Bellied or dipped sections where the ground has settled and water now pools instead of flowing away
- Old, undocumented alterations from decades of extensions and conversions
None of this is visible from the surface. A CCTV camera is the only way to see it.
Build-over agreements and Wessex Water
There is a second issue that catches buyers of period and extended properties: building over a public sewer. If a previous owner added an extension, conservatory or garden room over or close to a public sewer, they were supposed to get a build-over agreement from the sewerage undertaker — in the Bath area, that is Wessex Water. Where no agreement exists, the water company can require expensive remedial work, and it can complicate your own future plans.
A pre-purchase survey maps where the drains run and flags whether anything appears to have been built over them, so you can raise it with the seller before you exchange rather than discovering it as your problem afterwards.
What a pre-purchase CCTV survey actually gives you
A proper pre-purchase drain survey is more than a video. You should expect:
- High-definition footage of every accessible drain run, from the property to the public sewer connection
- Each defect graded to the WRc MSCC5 standard — the industry classification that distinguishes a minor cosmetic blemish from a serious structural failure
- A schematic drain map showing pipe routes and where each defect sits
- A written PDF report your solicitor, surveyor, lender or insurer can rely on
- Plain-English recommendations and, where needed, repair costs
Grading matters because it turns "there's a crack" into "this is a Grade 2 that can be monitored" or "this is a Grade 5 that needs relining now" — the difference between a shrug and a negotiation.
When to book, and what it can save you
The ideal window is after your offer is accepted but before you exchange contracts. That gives you time to act on the findings. If the survey uncovers problems, you can negotiate a reduction, make repairs a condition of sale, or — occasionally — walk away from a property that would have cost you far more than the survey ever did. A single collapsed clay drain under a Bath garden can run to several thousand pounds to excavate and replace; the survey is a small fraction of that.
The bottom line
If you are buying a Georgian, Victorian or otherwise older property in Bath, a pre-purchase drain survey is one of the most cost-effective checks you can make. It closes the blind spot your building survey leaves, and it gives you evidence rather than guesswork at exactly the point in the transaction where evidence has value.
Bath Plumbers carries out pre-purchase CCTV drain surveys across Bath and the surrounding area, with a graded written report delivered within 24 hours. Request a survey online — there is no call-out fee and the price is confirmed before we attend.
