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External sewerage and drainage works — Drain and sewer service — Professionals
External drainage projects need coordinated planning across pipework, access and ground conditions. Providers should establish a project boundary and appropriate specialist input before committing to excavation or network connections.
Service scope
Agreed work to wastewater pipes and associated access infrastructure outside a building, within a confirmed ownership boundary. The service can include installation, alteration or repair but does not assume authority over a public sewer or private treatment system.
What is normally included
- External wastewater pipework
- Specified chamber and connection works
- Ground and surface reinstatement coordination
What is not included
- Public-network work without authorisation
- Septic or treatment-system servicing by default
Qualification checks
- Confirm ownership and connection
- Review site layout
- Identify buried services
- Plan access and groundworks
- Specify testing and records
Quote guidance
Itemise the agreed pipe runs, chambers and connections, with groundworks and reinstatement clearly described. Record assumptions about unknown services and groundwater rather than burying those uncertainties in a single fixed figure.
Lead risks
- Actual route and depth may differ from drawings
- Shared or public connections can require additional coordination
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