Who Is Responsible for My Drains? A Homeowner Guide

One of the most common questions we hear is who actually pays to fix a blocked or broken drain. Here is a plain-English guide to what you own and what the water company looks after.

When a drain blocks or collapses, the first worry for most homeowners is the cost, quickly followed by the question of who is actually responsible for fixing it. The answer depends on where the problem is, and the rules changed significantly in 2011 when responsibility for many shared drains transferred to the water companies. Here is a clear guide to who looks after what.

The key is understanding three terms. A drain is the pipe that carries wastewater away from a single property, and it sits within that property's boundary. A lateral drain is the section of pipe that carries wastewater away from your property, usually beyond your boundary, and often connects to a shared sewer. A sewer is the larger shared pipe that collects wastewater from several properties. Knowing which type of pipe has the problem tells you who is responsible for it.

As a general rule, you are responsible for the drains inside your property boundary. Any pipework that only serves your home and sits within your land, such as the pipes running from your sinks and toilets to the edge of your property, is your responsibility to maintain and repair. This is the part homeowners most often need to deal with, and it is worth checking whether your buildings insurance covers drain damage, as many policies do.

Your local water company is generally responsible for lateral drains and shared sewers. Since the 2011 transfer, the pipes that run beyond your boundary, and any drain shared with neighbouring properties, are usually maintained by the water and sewerage company for your area. In much of Hampshire that is Southern Water, with some areas served by other providers. If a blockage or collapse is in a shared sewer, they will typically clear or repair it at no direct cost to you.

There is a useful rule of thumb for blockages. If the blockage only affects your home, it is likely in your private drain and therefore your responsibility. If it affects several neighbouring properties at once, it is probably in a shared sewer, which is the water company's responsibility, and you should report it to them.

Private roads, shared driveways, and older properties can complicate matters, and it is not always obvious from the surface which pipe is at fault. This is where a professional CCTV drain survey is invaluable, as it pinpoints the exact location and depth of the problem, which in turn confirms whether it falls on your side of the boundary or the water company's. If you are unsure who is responsible, our team can survey your drains, tell you exactly where the fault lies, and advise on the best course of action anywhere in Hampshire.