Blocked Drains explained
A blocked drain shows up as slow water, a bad smell or a gurgling plughole. The block may sit in one fixture or in a shared pipe that serves several. However, a few quick checks tell you which, and that saves time and money.
First, count the fixtures that drain badly. If only one sink or toilet is slow, the block is probably in its own pipe. If several are slow at once, the shared pipe is the likelier cause, since they all feed into it.
Where the block usually sits
Use this table as a rough guide. It cannot replace a look inside the pipe, because one symptom can have several causes. Treat each row as a starting point.
| Symptom | Likely cause | What to do next |
|---|---|---|
| One sink drains slowly | Grease, food or soap in the trap or waste pipe | Clean the trap, then ask for the pipe to be cleared |
| The toilet fills towards the rim | Paper or wipes in the pan or soil pipe | Stop flushing, plunge once, then ask for help if it stays |
| Several fixtures drain badly and gurgle | A block in the shared pipe | Check the outside gully and manhole, then send a request |
| Water pools around an outside gully | Leaves, silt or roots in the outside run | Clear surface debris, then ask about drain jetting |
| Sewage smell, or sewage at a manhole | A block or damage in a drain or sewer | Treat it as urgent and read the emergency page |
Blocks that keep coming back often point to damage, not dirt. In that case a CCTV drain survey shows the pipe from the inside. Clearing the same block again and again only treats the symptom, while a survey finds the cause.
Who owns the blocked pipe in Scotland?
Since ownership decides who pays, start there. Under the Sewerage (Scotland) Act 1968, Scottish Water must provide the public sewers that drain its area. Citizens Advice Scotland says Scottish Water maintains and repairs those sewers.
The same Act defines a drain as a pipe inside the property boundary that serves one building, while a pipe that serves more than one property is usually a sewer. Citizens Advice says owners must arrange and pay for repairs to their own drains, up to the point where they join the sewer. Check where your own pipe ends before you pay for anything.
Shared pipes need care because two views exist. Citizens Advice says owners of a shared pipe are jointly responsible, and the title deeds usually say how to split costs. However, Scottish Water guidance says a drain that leaves your boundary, or joins drains from another property, becomes a public sewer. So the answer depends on where the shared pipe runs.
Read your title deeds first, then ask Scottish Water about any pipe beyond your boundary. If you rent from Dundee City Council, the council says to report a blocked or defective drain to its Customer Service Team or any Housing Office. Although many online guides describe English rules, those do not apply in Scotland.
Typical UK costs for clearing a blocked drain
These are ranges from published UK cost guides. They are not Dundee quotes, and prices still vary with access, pipe length and the cause of the block. Fantastic Services says prices in London and the south-east run 15 to 30% above those in northern England, Wales and Scotland.
| Job | Range the guide gives | Source |
|---|---|---|
| Drain cleaning | £80 to £100 | MyJobQuote |
| Rodding | £80 to £145 | MyJobQuote |
| Outside drain unblocking | £80 to £150 | MyJobQuote |
| Basic unblocking | £80 to £150 | Book A Builder |
| Most unblocking outside London | £80 to £250 | Fantastic Services |
MyJobQuote also lists a standard call-out charge of £50 to £100. Ask the engineer whether there is a call-out charge and what it covers. Then ask for a written quote before work starts, and compare two quotes if the job looks large, since prices vary.
Find the page that fits your problem
Each guide goes deeper on one fixture, since each one blocks in its own way. Blocked toilet help covers paper, wipes and repeat blocks. Blocked sink help covers grease and food waste.
Blocked bath and shower help covers hair and soap scum. If the block sits outside, read about drain unblocking and drain cleaning instead. For stubborn grease or silt, drain jetting is still the usual next step.
Local pages for this service
Each local page covers this service for one town. Start with blocked drains in Dundee, which is the main page. If you are further out, read clearing a blocked drain in Broughty Ferry or Monifieth blocked drain help. Each of those pages links back here.
Ask for help
Use the request form at the top of the page. Say what the problem is, where it sits and whether it is urgent, so the engineer can plan. Then ask for a written quote before work starts.
Go to the request formBlocked Drains questions answered
Who is responsible for blocked drains in Scotland?
You are responsible for the drains that serve only your property, and you arrange and pay for work on them. Scottish Water looks after the public sewers. Still, a pipe that serves more than one property is usually a sewer, so ask Scottish Water if you are unsure.
Does Scottish Water unblock drains?
Scottish Water maintains and repairs public sewers, while the drains that serve your home are your responsibility, up to the point where they join the sewer. If the block sits in a public sewer, report it to Scottish Water. Keep a note of the date you reported it.
Who is responsible for shared drains in Scotland?
It depends where the shared pipe runs. Citizens Advice Scotland says owners of a shared pipe are jointly responsible, and the title deeds usually set out how to split costs. However, Scottish Water guidance says a drain that leaves your boundary, or joins drains from another property, becomes a public sewer. Check your deeds first, then ask Scottish Water.
What causes blocked drains?
Grease, hair, wipes and food waste cause most blocks inside the home, while leaves, silt and tree roots cause most blocks outside. Damaged or sagging pipes can also trap waste, so repeat blocks may need a camera check. A survey shows which cause applies.
What can I do before I ask for help?
Stop using the affected fixture and see whether other fixtures are slow too. Look at the outside gully for leaves and silt. Avoid strong chemical cleaners, because they rarely clear a solid block and can be harsh on old pipes.
How much does it cost to clear a blocked drain?
Book A Builder puts basic unblocking at £80 to £150. Fantastic Services gives £80 to £250 outside London. These are UK guide ranges, not Dundee quotes. Costs still vary with access and the cause, so ask the engineer for a written quote before work starts.