How to Plan Driveway Drainage in 2026 (UK)
Get drainage right and your driveway stays usable, legal and flood-free for decades; get it wrong and you risk standing water, a soggy garden, and falling foul of UK SuDS rules — since 2008 any new non-permeable driveway over 5 m² that drains onto the public highway needs either drainage back into your own land or planning permission. The three workable routes are permeable surfacing, channel (linear) drains feeding a soakaway, or a gravel/sub-base sponge. This guide walks you through assessing your site, choosing a method, sizing a soakaway and getting it signed off.
How to Plan Your Driveway Drainage
- Check the SuDS rule first. If your new driveway is non-permeable and over 5 m² draining to the road, you must drain to your own land or apply for planning permission. Permeable surfaces are exempt.
- Test how your ground drains. Dig a 300mm test hole, fill with water and time how fast it drops. Free-draining soil suits a soakaway; clay needs a larger soakaway or a connection to a surface-water sewer.
- Set the falls. Slope the driveway 1:40 to 1:60 away from the house and toward your chosen drainage point so water never pools against the building.
- Choose the method. Permeable block paving or resin, a channel drain across the threshold feeding a soakaway, or a gravel sub-base that absorbs run-off.
- Size the soakaway. Use a soakaway crate sized to the driveway area and your soil's infiltration rate — typically 1–2 m³ of crates for an average drive, set at least 5m from the house.
- Install a threshold drain at the house. A linear channel drain (ACO type) across the garage or front door stops water entering the property.
- Get it signed off. Keep evidence the surface is permeable (or that drainage is to your own land) for Building Control and future sale.
Permeable vs Channel Drain vs Soakaway
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