What drainage groundworks involves
Drainage groundworks cover the installation, alteration or replacement of external drainage infrastructure. This can include drainage runs, manholes, gullies, connections and surface-water management, subject to the design, site conditions and any approvals required.
When it may help
- New build or extension drainage
- Alterations to existing external drainage
- Damaged manholes, gullies or pipe runs
- Surface-water or foul-water drainage requirements
How it is assessed
The work begins with site information, levels, access and the proposed drainage route. The required excavation, pipework, chambers and reinstatement are then planned around the site and the applicable requirements.
What to expect
Before an engineer arrives
Provide drawings, survey information and details of the intended development or drainage problem where available. This helps define the scope and identify any approvals that may be required.
Timing
Programme length depends on the scale of excavation, ground conditions, material supply, access and coordination with other trades or inspections.
What affects the price
Price depends on the design, excavation depth, ground conditions, pipe lengths, chambers, reinstatement and any testing or approval requirements.
Excavation and alternatives
Groundworks generally involve excavation. The required extent and reinstatement should be described clearly in the proposed scope before work begins.
Common questions
What information is useful before drainage groundworks?
Existing drawings, drainage surveys, site levels, access details and the planned use of the site can all help define a suitable scope.
What affects a drainage installation programme?
The programme depends on excavation, ground conditions, material lead times, access, testing and any coordination with other trades or inspections.
Do drainage works need approvals?
Requirements vary with the site and the proposed work. Confirm the relevant building-control, water-company or planning requirements before the work is authorised.