Drain Repair Options Explained: From Patch Lining to Full Excavation

Facing a broken drain? We explain the different repair options available, including minimally invasive patch lining, full relining, and traditional excavation.

When a CCTV survey reveals structural damage to your drainage system, such as a crack, a collapsed section, or severe root ingress, a repair is necessary to restore function and prevent further property damage. Modern drainage technology offers several repair options, ranging from minimally invasive techniques to traditional digging. Understanding these options helps you make an informed decision based on cost, disruption, and the severity of the damage.

The first step is always an accurate diagnosis via a CCTV survey. This dictates the appropriate repair method.

Option 1: Patch Lining. This is a localised, no-dig repair ideal for isolated defects like a single cracked joint, a small hole, or minor root damage. A fibreglass mat impregnated with a specialised silicate resin is wrapped around an inflatable packer. This is positioned over the defect inside the pipe and inflated. The resin cures and bonds to the existing pipe wall, creating a tough, watertight patch that seals the damage. It is fast, cost-effective, and requires zero excavation, preserving your garden or driveway.

Option 2: Full Pipe Relining. When a longer section of pipe is degraded, suffering from multiple cracks, or extensive root ingress, full relining is the superior no-dig solution. Similar to patch lining but on a larger scale, a continuous, flexible liner coated in resin is inverted and pulled through the entire damaged length of the pipe. Once inflated and cured, it essentially creates a brand-new pipe within the old one. It seals all joints, increases flow efficiency, and can extend the life of the drain by over 50 years, all without lifting a single paving slab.

Option 3: Full Excavation and Replacement. While no-dig technology is preferred, it is not always possible. If a pipe has suffered a catastrophic collapse, is severely misaligned, or has lost its gradient (meaning water pools rather than flows), lining cannot fix it. In these instances, traditional excavation is the only option. The damaged section must be dug up and physically replaced with new pipework.

Excavation is undoubtedly the most disruptive and expensive option, requiring groundworks, potential reinstatement of driveways, and longer completion times. However, sometimes it is the only way to achieve a permanent, structurally sound repair.

Choosing the right option is a matter of balancing the extent of the damage with the cost and disruption of the repair. At A&B Drainage Solutions, we always prioritise no-dig methods wherever feasible to save our customers time and money, but we possess the full groundwork capabilities to undertake complex excavations when strictly necessary.