Why Greenwich properties get standing water and waterlogged ground
Greenwich combines Georgian and early Victorian terraces near the town centre, larger detached and semi-detached homes towards Blackheath, and newer riverside flats along the Thames. Older properties frequently retain their original below-ground clay pipework.
The most common failure in a French drain is having nowhere for the water to end up. A trench that fills and cannot discharge is a soakaway with extra steps.
The riverside is tidal and parts of the borough fall steeply from the heath, so surface water arrives fast and finds any weak point in a drain run. Older clay joints, root ingress from mature street trees and displaced sections are the faults we see most often.
Our approach in Greenwich
Ground conditions decide the specification, so we test rather than assume.
- Survey the site, the levels and the subsoil to confirm where water is collecting
- Establish a viable discharge point, whether a surface water drain, a soakaway or a watercourse
- Excavate the trench to the depth and fall the design requires
- Lay geotextile membrane, perforated pipe and washed aggregate in the correct order
- Reinstate the surface and check the run under a controlled flow of water
Conservation areas and cobbled or stone-set frontages need care when covers are lifted. We work around that rather than forcing access, and we reinstate what we move.
Signs it needs attention now
- Ground that stays waterlogged for days after rain
- Water pooling against an external wall or across a patio
- Damp appearing on an internal wall at low level
- A lawn that has become moss-heavy and will not dry out
- A newly paved area with no drainage provision
What we see most often in Greenwich
- Root ingress from mature street trees into older clay pipework
- Displaced joints caused by ground movement on the slopes towards the heath
- Surface water arriving faster than gullies can take it after heavy rain
In Greenwich we work for owners of period houses, for buyers commissioning a survey before completion, and for the managed blocks along the riverside. Conservation-area properties need a careful approach, and we plan for that rather than improvising on the day.
Equipment and what happens afterwards
A French drain is only as good as its components, so we use geotextile membrane, perforated pipe and washed aggregate rather than pit-run material that will clog. The membrane is what keeps fine soil out of the stone, and it is the thing most often left out of a drain that silts up within two seasons.
We test the finished run with a controlled flow of water before reinstating the surface, so you can see it discharging rather than take our word for it. We explain where the water goes and what to keep clear, and we are honest when a French drain is not the right answer and the real problem lies somewhere else.
What french drains cost in Greenwich
French drain installations are quoted after a site visit, because the price depends on the run length, the depth and where the water can be taken. We confirm the figure before any work starts, so nothing changes once the engineer is on site in Greenwich.
Areas we cover around Greenwich
Greenwich sits within our core coverage, taking in SE10, SE3, SE7 and SE18 across Royal Borough of Greenwich. Average response is 75 minutes, and we operate in Southwark, Tower Hamlets, Peckham and Dulwich too, which helps when a drain run is shared between properties in different streets.