Signs you need drain excavation help
- A camera survey shows a collapsed or crushed pipe
- Ground sinking over a drain run
- A drain that will not flow at all after clearing
- A pipe too damaged for relining
Drain Excavation: what the job involves
Drain excavation means digging down to a damaged drain and replacing it, while relining leaves the pipe in place. It is the fix when a pipe has collapsed, lost its shape or sunk too far to reline. The engineer uses camera footage to mark exactly where to dig. That keeps the trench as small as possible.
They lift the surface and dig down to the pipe, since they need room to cut out the damaged section. They then lay a new pipe on a proper bed and connect it to the old run. Before filling the trench, they test the new section. Finally, they backfill the trench and make good the surface.
Excavation takes longer than relining and causes more disruption. Still, it gives you a new pipe where the old one had failed. The depth of the drain and the ground conditions affect how long it takes. The engineer explains the plan and the time, and you can ask for the price before they start.
How the job goes
- 1. Mark the damage The engineer uses camera footage to mark where to dig.
- 2. Replace the pipe They dig down, cut out the damage and lay a new section.
- 3. Test and reinstate They test the new pipe, fill the trench and make good the surface.
Typical costs
Excavation costs vary widely, because depth, access and the surface on top all matter. A camera survey first, at about £85 to £350 (MyJobQuote and Precise Drainage, 2026), shows what the job involves. Your engineer then quotes for the dig and repair. If the damage is in a shared lateral drain or public sewer, the water company should pay instead.
Around Wolverhampton
Ground conditions vary a lot across our area. For example, Dudley and Cannock both have old mine workings in places, while much of Wolverhampton sits on clay and sandstone. The Coal Authority can tell you if your home sits in a former coal mining area. Your engineer takes the ground into account when planning a dig.
Drain Excavation: frequently asked questions
How long does drain excavation take?
A short, shallow repair can take a day. However, deeper pipes, longer runs or hard ground can take two or three days. The engineer gives you a timeframe before starting.
Will excavation damage my garden or drive?
The trench does disturb the surface above the pipe. However, camera footage keeps the dig as small as possible. The engineer makes good the surface afterwards.
Is excavation the only option for a collapsed drain?
Usually, yes, because a liner needs a pipe that still holds its shape. If only part of the pipe has collapsed, a mix of digging and relining may work. The camera survey shows which option suits your drain.
Who pays for a collapsed drain?
You pay for drains that only serve your home. However, shared lateral drains and public sewers belong to the water company. The survey shows which part has failed.