A sewer connection is where a private drain joins the public sewer network. If you are building a new house, adding an extension with a bathroom, converting a garage or changing a drain run, ring 07427 195142. We can survey and trace the existing drains so you know what you are connecting into, and explain how the connection process works in Scotland.
Private drains and public sewers
In Scotland, Scottish Water owns and maintains the public sewers. The drains on your side of the connection, serving your property, are generally yours. Shared private drains that serve several properties before reaching the sewer are usually the joint responsibility of those owners, according to the title deeds. Our guide to who is responsible for a blocked drain explains where the lines usually fall.
Any new connection to the public network, or a change to an existing one, needs Scottish Water's agreement. Building work that involves drainage will usually also need a building warrant from the local council. Our guide to drainage regulations in Scotland covers both in plain language.
When you might need a connection
Some of these involve a brand-new connection. Others connect to a private drain that already runs to the sewer, which is simpler but still means checking that the existing pipe has the capacity and condition to take more.
- A new build house or a plot being developed
- An extension or conversion adding a toilet, kitchen or shower
- Moving off a septic tank onto the mains where a sewer is nearby
- Separating foul and surface water where they were wrongly combined
- Replacing a damaged connection where the drain meets the sewer
Surveying and tracing first
The most common surprise on a connection job is the existing drain. Old plans are often wrong, pipes do not run where people expect, and a run that looks fine at the chamber can be cracked or dipped further along. A CCTV drain survey shows the condition of the pipe you plan to connect to, with footage and a written report.
Tracing and mapping the run tells you its route, depth and where it meets the sewer, which is the information designers, builders and building control will ask for. Our guide to drain tracing and mapping explains how that is done. For a property you are buying with development in mind, our homebuyer drain surveys page is also relevant.
Foul and surface water
Many areas have separate sewers: one for foul water from toilets, sinks and showers, and one for surface water from roofs and paving. Connecting a new bathroom to the surface water sewer, or a downpipe to the foul sewer, is a misconnection that causes pollution or overloads the system. New development is generally expected to manage surface water sustainably, which may mean a soakaway or other arrangement rather than a sewer connection at all.
Getting this right at the start saves rework later. Where surface water needs a different route, our pages on land drainage and drainage channel installation describe some of the options.
Existing connections that have failed
The point where a private drain meets the sewer can crack, shift or let roots in, just like any other joint. Symptoms include repeated blockages near the boundary, smells, or a survey showing a displaced joint at the junction. Depending on the fault and where it sits, a no-dig drain repair from inside the pipe may be possible, or the section may need to be excavated as described on our drain repairs page. If the fault is on the public side, it is Scottish Water's to fix, and the survey footage helps show where it is.
Questions
Do I need permission to connect to the public sewer?
Yes. New connections and changes to existing ones need Scottish Water's agreement, and drainage building work usually needs a building warrant.
Can I connect an extension to my existing drain?
Often, if the existing drain is in good condition and has the capacity. A camera survey first shows whether it does.
Why survey the drain before connecting?
Plans are often inaccurate and old pipes can be damaged out of sight. Seeing the route and condition first avoids building onto a fault.
Who repairs the junction between my drain and the sewer?
It depends where the fault sits. Your side is usually the owner's responsibility; the public sewer is Scottish Water's. Footage helps show which.