No-dig repair — also called CIPP (cured-in-place pipe) lining — is now the default fix for the majority of drainage defects in UK domestic and commercial pipework. A felt or fibreglass sleeve soaked in epoxy or polyester resin is drawn into the pipe from an existing manhole or rodding eye, inflated against the pipe wall with an air or water bladder, and left to cure. Once cured the liner is a structural pipe in its own right with a design life of 50 years or more.
There are two forms. A patch liner covers a single defect — a cracked section, an open joint, a root entry point — and is typically 500mm to 1.5m long. A full-length liner reconstructs an entire run between two chambers where the pipe is degraded along its length. Both are installed in hours rather than days, and neither disturbs driveways, patios, extensions or established planting.
Excavation is only genuinely necessary when the pipe has fully collapsed, deformed so badly the liner cannot pass, or dropped out of alignment to the point where flow has stopped. A drainage contractor who quotes excavation before running a CCTV survey is guessing — always ask to see the camera footage that justifies digging.