Gardens & Drainage · Problem & repair
Waterlogged lawn that will not dry out
A soggy lawn is one of three problems wearing the same coat: compacted topsoil, heavy subsoil that will not let water through, or water arriving from somewhere else and having nowhere to go.
Treating the wrong one is expensive, so the diagnosis is worth doing properly before anything gets dug.
How to tell this is your problem
- Standing water for more than a day after rain
- Moss taking over from grass
- Squelching underfoot well into spring
- Grass thin and yellow in the wettest zones
- Water arriving from a neighbouring level or hard surface
Repair or replace?
Start with aeration and source control - a surprising number of waterlogged lawns need no pipework once compaction and run-off are dealt with.
Repair options, cheapest first
- 01
Aerate and top-dress
Hollow-tine aeration followed by a sandy top-dressing opens the surface and improves infiltration. The right first step for compaction.
- 02
Land drainage
A herringbone or single-run perforated drain in gravel, discharging to a soakaway or approved outfall. The answer where water genuinely cannot escape.
- 03
Re-grade the levels
Sometimes the lawn is simply the lowest point. Adjusting levels so water sheds to a planted or drained area solves it without pipework.
- 04
Intercept the source
Re-routing downpipes and adding a channel at the base of hard surfaces stops the lawn receiving water it was never going to cope with.
Why it happens
Surface compaction
Foot traffic, play and machinery close the pore structure of the topsoil so water cannot infiltrate. Very common and the easiest to fix.
Heavy clay subsoil
Clay drains slowly by nature. Where topsoil is thin over clay, water backs up at the interface.
Construction spoil under the turf
Many newer gardens have turf laid over compacted builder's subsoil with minimal topsoil - effectively a shallow bowl.
Run-off from hard surfaces
Patios, drives and roofs discharging onto the lawn deliver far more water than the ground can absorb.
Cost and time on site
Indicative cost
Aeration and top-dressing is a modest per-square-metre cost. Installed land drainage is significantly more and depends on the outfall distance.
Typical duration
Aeration is a day. A drainage scheme is typically two to five days depending on run length.
Every quote is priced after seeing the site. We diagnose before we dig - aeration first, drainage only where it is genuinely needed.
Waterlogged lawn: common questions
- Will sand fix a waterlogged lawn?
- Sand dressing over aeration holes helps. Spreading sand on an unaerated compacted surface achieves very little.
- Where can land drainage discharge to?
- Usually a properly sized soakaway within the property. Connecting to a sewer or discharging onto a neighbour's land is not acceptable without permission.
- Is artificial grass a solution to waterlogging?
- Only if the drainage beneath is built correctly. Laid over the same wet ground, it stays wet - and smells.
- When is the best time to aerate?
- Autumn or spring, when the grass is growing and can recover, and the ground is workable rather than saturated or baked.
Services that fix this
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