Resin driveways and drainage

In short: resin bound is porous, but a driveway only drains to ground if the binder course and sub-base are permeable and the ground can absorb water. On clay or solid existing bases, water needs falls and somewhere to go: a lawn or border, a soakaway at least 3 m from foundations, or a channel drain. Government guidance gives simple tests to check.

Three ways a resin drive drains

Approach	How it works	Suits
Permeable to ground	Water passes through resin, porous binder and open-graded sub-base into the ground	Sandy, gravelly or chalk ground that absorbs water
Permeable with storage and outlet	Sub-base stores water and releases it through a pipe to a soakaway or outlet	Slow-draining clay
Impermeable with falls	Water drains through the resin then runs over a solid base to a lawn, border or channel	Overlays on sound tarmac or concrete

Ground conditions around Guildford

Ground varies sharply over short distances here. The North Downs chalk runs east to west through Guildford; to the south lie the sandy Lower Greensand soils around Shalford, Bramley, Godalming and Shere; to the north, around Woking, Send and Worplesdon, the ground is a patchwork of London Clay, Bagshot sands and river deposits along the Wey. This is general geology, not a site assessment, but it shows why an installer should test your ground rather than assume.

The government tests

Pit test before building: dig a 300 mm cube and fill it with water. If it takes more than 11 hours to drain, include a pipe outlet rather than relying on infiltration alone.
Peg test for ground strength: if a 50 mm square peg is hard to drive beyond 150 mm, the ground is likely strong enough; if it goes in easily, get expert advice.
Hosepipe test on the finished surface: after one or two minutes, there should be no puddles and water should not run more than 200 to 300 mm.

Soakaways and channels

Government guidance says rain gardens and soakaways for small driveways should be at least 3 m from building foundations, or further depending on ground conditions. Channel drains are used across drive entrances and in front of garages where falls cannot be corrected.

Why it matters locally

The Environment Agency's 2024 national assessment estimates 4.6 million properties in England are at risk of surface water flooding. Every driveway that drains on site rather than onto the road reduces the load on local drains during heavy rain.

Frequently asked questions

Are all resin driveways permeable?

The resin layer is porous, but the drive as a whole is only permeable if everything beneath it is. Over solid concrete or dense tarmac, water drains through the resin and runs off across the old surface.

My drive slopes towards the house. What should be done?

Water must not be directed at the house. The installer should regrade the base or add a channel drain in front of the house or garage connected to a soakaway or suitable outlet.

Can I connect a drive to the road drain?

Under the 2008 rules, draining an impermeable front-garden surface over 5 m² to the road or public drain needs planning permission. Draining to ground on your own property avoids this.

Sources

MHCLG and Environment Agency, Guidance on the permeable surfacing of front gardens — www.gov.uk/government/publications/permeable-surfacing-of-front-gardens-guidance
Environment Agency, National assessment of flood and coastal erosion risk in England 2024 — environmentagency.blog.gov.uk/2024/12/17/transforming-our-understanding-of-flood