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Drain Excavation & Installation

When a drain can’t be repaired, we replace it safely and with minimal disruption.

We carry out full drain excavations and new installations where lining or patching isn’t suitable. Collapsed runs, old clay pipework, or a brand-new system for an extension or new build, we handle it start to finish.

Open excavation with new orange drainage pipe being installed

When excavation is necessary

  • Collapsed or severely broken pipes
  • Old clay or cast iron systems
  • Poor gradient or incorrectly installed drains
  • Extensions, outbuildings and new builds
  • Relocating existing drains
  • Root damage too severe for lining or patching
  • Trap removal and replacement

We install

  • Foul water drainage systems
  • Surface water systems, including soakaways and gullies
  • New manholes and inspection chambers
  • Pipe rerouting for extensions or landscaping
  • Connections to mains sewers (where permitted)
  • Rainwater harvesting and attenuation systems

Signs you may need excavation

  • Frequent blockages
  • Sunken or flooded areas in a garden or driveway
  • Toilets or sinks backing up with no clear cause
  • Older properties with outdated drainage
  • Builders needing new drainage for a project

Our process

  1. 01

    CCTV survey & diagnosis

    A camera inspection confirms the problem and the affected section.

  2. 02

    Excavation planning

    We plan the safest, cleanest dig with minimal impact.

  3. 03

    Excavation & removal

    We dig only where needed and remove the damaged pipework.

  4. 04

    New installation

    New pipework to modern standards, with correct flow and alignment.

  5. 05

    Backfill & reinstatement

    We backfill, compact and restore the surface as close to original as possible.

Recent jobs

Drain excavation in progress
Drain replacement work in progress
New pipe visible at the bottom of an inspection chamber
New orange PVC pipe connected into an old run
Drainage installation by Treaty Drains

Why choose us

  • Experienced in deep and complex excavations
  • Domestic and commercial work
  • Your property treated with care
  • Fully insured and qualified
  • Free CCTV survey included with major works

Other services

Book a drain assessment

We’ll inspect the drain and talk you through the repair and replacement options, with costs.

Call 020 7101 4086Callback