Drain Unblocking explained
Drain unblocking means clearing the waste pipe so water flows again. The pipe may be inside the house, such as a sink or toilet waste, or outside, such as a gully or manhole run. The method depends on the pipe and on what is blocking it, because each type takes a different tool.
Engineers usually start with the simplest tool that could work. Drain rods and plungers deal with soft blocks, while a powered snake or a water jet handles harder ones. If the block comes back, a camera check shows why.
How drains are usually unblocked
Most jobs follow the same order, while the tools change with the block. The engineer finds which pipe is blocked, then picks a tool to match the block. After that, running water through the pipe shows whether the flow has returned.
- Plunger or toilet auger: soft blocks in a pan or a trap
- Drain rods: blocks in a straight outside run
- Powered drain snake: hair, roots or compacted waste in bends
- High-pressure water jet: grease, scale and silt on the pipe walls
- Camera inspection: repeat blocks and unknown causes
Jetting suits many outside drains, since the water scours the pipe as well as clearing the block. You can read more on the drain jetting page.
What to try before you call
A plunger clears many simple sink and toilet blocks, so try one first. It costs little. Wear gloves, and wash your hands afterwards. Stop if water starts to overflow.
Be careful with chemical drain cleaners. Read the label, never mix products, and keep them away from children. Chemicals can also stay in the pipe, so tell the engineer if you used any, since they can harm skin.
Inside or outside the house?
Inside blocks show up at one fixture or in the waste pipes behind the walls, where waste enters. The guide to internal drain unblocking explains the signs and the fixes.
Outside blocks show up as pooling water, a full gully or a manhole near the surface, and ownership of the pipe varies. The guide to external drain unblocking explains who owns the pipe and how it is cleared.
Typical UK costs for drain unblocking
These are typical UK ranges from national price guides, not Essex quotes. The final price moves with access, pipe length and the cause.
| Job | Typical UK range | Source |
|---|---|---|
| Minor blockage | £80 to £150 | Precise Drainage Solutions |
| Moderate blockage | £150 to £300 | Precise Drainage Solutions |
| Outside drain | £80 to £150 | MyJobQuote |
| Sewer drain | £100 to £200 | MyJobQuote |
| Jetting | £70 to £175 | MyJobQuote |
Complex or recurring blocks can cost £300 or more, according to Precise Drainage Solutions. Ask for a written quote before work starts, since the scope can change once the pipe is open. Also ask whether there is a call-out charge.
Drain Unblocking guides
External Drain Unblocking
Outside drains, gullies and manholes block with leaves, silt and roots, and ownership of the pipe varies. This page explains who owns what and how it is cleared.
Internal Drain Unblocking
Inside waste pipes block with hair, grease and wipes, and the fixture may not show where. This page explains how to find the blocked pipe and what clears it.
Local pages for this service
Local pages cover drain unblocking town by town. Start with drain unblocking in Chelmsford, which is the main page. If you are further out, read unblocking a drain in Brentwood or Billericay drain unblocking guide. 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 formDrain Unblocking questions answered
How do I unblock a drain outside my house?
Lift the gully cover if it is safe, since leaves and silt often sit just below. Clear what you can reach with gloves and a stiff brush. If water still does not drain, ask an engineer to rod or jet the run.
How much does drain unblocking cost in the UK?
Precise Drainage Solutions gives £80 to £300 for minor to moderate blocks. MyJobQuote gives an average of about £100. Jetting and complex jobs cost more, since they take longer. Ask for a written quote first.
Why does my drain keep blocking?
A drain that blocks again and again may have damage, roots or a sagging section. Clearing the block treats the symptom, while a camera survey finds the cause. Ask for a CCTV drain survey if the block returns.