Drain Unblocking explained
Drain unblocking clears a pipe that has stopped carrying water. Drain cleaning goes a step further, since it removes the grease, silt and scale that line the pipe. Many jobs involve both, so the two terms often mean the same visit.
Where the block sits decides the method. A sink trap needs a spanner and a bucket, while a long outside run may need rods or a water jet. The sections below explain each case in plain terms.
Drain cleaning or drain unblocking: which do you need?
Choose unblocking when water will not drain at all. Choose drain cleaning when drains run slowly or smell, because build-up is narrowing the pipe. If you are unsure, say so in your request and describe what you see.
- Water will not drain: ask for drain unblocking
- Water drains slowly or smells: ask for drain cleaning
- The same block returns every few weeks: ask about a camera check
- Water backs up outside: ask for the gully and manhole to be checked
Inside drains and outside drains
Internal drain unblocking covers traps, waste pipes and stacks inside the building. External drain unblocking covers gullies, manholes and the pipes under your garden. Pick the page that matches where the water backs up, since the fixes differ.
The two meet at the point where the waste leaves the building. A block there can look like an inside problem, yet the cause may sit outside. For that reason, tell the engineer which fixtures are slow.
Methods you may be offered
Engineers choose a method to suit the pipe and the cause, although the choice varies from one engineer to the next. This table shows the usual options. Ask the engineer to explain the choice.
| Method | Usually suits | Worth knowing |
|---|---|---|
| Plunger or auger | Sinks, toilets, baths and showers | Reaches blocks near the fixture |
| Drain rods | Outside runs and manholes | Pushes through soft blocks |
| Cable machine | Longer pipe runs | Cuts through roots and hard build-up |
| High-pressure water jet | Grease, silt and scale | See the drain jetting page |
| Camera check | Blocks that keep returning | See the CCTV drain survey page |
Ask which method the engineer plans to use, and why. A jet suits some pipes and not others, so a good answer names the pipe type, for example clay or plastic. You can read more on drain jetting and on CCTV drain surveys.
Typical UK costs for drain unblocking
These ranges come from published UK cost guides. They are not Dundee quotes, so treat them as a rough guide, because real prices still depend on the job. Prices differ between engineers.
| Job | Range the guide gives | Source |
|---|---|---|
| Outside drain unblocking | £80 to £150 | MyJobQuote |
| Rodding | £80 to £145 | MyJobQuote |
| Basic unblocking | £80 to £150 | Book A Builder |
| Most unblocking outside London | £80 to £250 | Fantastic Services |
MyJobQuote lists a standard call-out charge of £50 to £100 and an emergency call-out of £100 to £200. Since charges differ between engineers, ask what the call-out covers. A written quote before work starts keeps everyone clear on the price.
Local pages for this service
Each local page covers this service for one town. Start with drain unblocking in Dundee, which is the main page. If you are further out, read drain cleaning in Arbroath or Forfar drain unblocking help. Each of those pages links back here. On the Fife side of the Tay, there is also a page for drain unblocking Tayport.
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 formDrain Unblocking questions answered
What is the difference between drain unblocking and drain cleaning?
Unblocking clears a pipe that has stopped draining, while drain cleaning removes the grease, silt and scale that build up on the pipe walls. Many jobs involve both, so describe your symptoms in the request. The section above explains the difference in more detail.
Who is responsible for unblocking outside drains?
You are responsible for drains that serve only your property. Scottish Water looks after the public sewers. However, if a pipe serves several homes, check your title deeds and ask Scottish Water where the public sewer begins.
Who do I call if an outside drain is blocked?
Start by working out who owns the pipe, since that decides who to call. If it is your own drain, send a request through the form so an engineer can respond. If the block is in a public sewer, report it to Scottish Water instead.
What can I put down a blocked outside drain?
Clear loose leaves and debris by hand first, using gloves. Then flush with clean water from a hose. Avoid strong chemicals, because they rarely shift a solid block and can be harsh on old pipes. If the water backs up, stop and ask for help.
What is the fastest way to unblock a drain?
For a sink, clean the trap and use a plunger. For a toilet, one or two plunges often move a soft block. However, a block that returns or affects several fixtures needs proper equipment, so ask for help.
How much does drain unblocking cost?
MyJobQuote lists outside drain unblocking at £80 to £150, and Fantastic Services gives £80 to £250 for most jobs outside London. These are UK guide ranges, not Dundee quotes, so real prices may still differ. Ask for a written quote before work starts.