Drain excavation means digging down to replace a failed section of pipe. It suits drains that have collapsed, lost their shape, or cracked along a long length. Relining often cannot fix those faults. Because a CCTV survey shows where the damage is, the trench can stay as small as possible.
The engineer reviews the camera footage to plan the dig. Ask for a clear scope of work before they start, including who puts the surface back. Because the footage shows the depth, it helps limit the dig.
A mini-digger suits open ground, while hand digging suits tight spaces near buildings. Shoring keeps the trench safe where it runs deep. For example, a dig beside a wall needs more care.
The engineer removes the damaged section and lays new pipe at the right fall. New drainage work must meet Building Regulations Part H, so ask how the job will do that. Since the rules cover gradient and joints, this matters.
The engineer fills the trench in layers, so the ground does not settle later. Ask what surface finish the price includes, such as turf, paving, or tarmac. Because reinstatement can add cost, check this before you agree.
The cost of excavation depends on depth, length, ground type, and surface repair. Because each dig differs, ask for a written quote after the CCTV survey. Check what the quote says about putting surfaces back, since that can add a lot. Ask whether there is a call-out charge too.
Time depends on the length and depth of the pipe and on the ground. Putting the surface back adds to it. Since every dig differs, ask the engineer for an estimate before work starts.
Digging a trench does disturb the ground. A camera survey first helps keep the trench short. However, ask what the quote includes for putting lawns, paving, or tarmac back.
Often, yes. When a pipe has fully collapsed and lost its shape, digging is usually the sure repair. However, a partly collapsed pipe may suit relining. A CCTV survey shows which method fits.