Groundworks in Ashtead
From The Park Estate to the Common. We deliver engineered foundations, basements, and drainage solutions to Ashtead with zero travel costs.
Built for Ashtead
Whether you are extending a property in the 'Lanes' or building new near Ashtead Park, we have the local geological data to ensure your project is compliant and secure.
The Clay/Chalk Divide
Ashtead presents two distinct geological challenges. North of the railway line (towards Ashtead Common), the ground is predominantly Heavy London Clay. This highly shrinkable soil requires specific heave protection.
To the south (towards Headley and Epsom Downs), the ground transitions to Chalk. While this offers better stability, it requires different drainage strategies to prevent wash-outs. We tailor our engineering to your specific street.
In the clay zones (e.g., The Lanes), we use compressible heave board (Claybord) under foundations to absorb ground movement and prevent structural cracking.
In the chalk zones, we utilize deep-bore soakaways to manage surface water effectively, adhering to strict environmental protection guidelines.
Surface Water Management
Unlike Leatherhead, Ashtead's primary risk isn't river flooding, but Surface Water Run-off. Rainwater flows rapidly off the Downs and pools on the impermeable clay of lower Ashtead. We implement advanced SUDS (Sustainable Urban Drainage Systems).
Hydro-Brakes
Flow control devices installed in manholes to regulate the speed at which storm water leaves your property, preventing sewer overwhelm.
Permeable Paving
Essential for Ashtead driveways. We install porous sub-bases that allow water to filter naturally into the ground rather than pooling.
French Drains
Perimeter drainage systems designed to intercept run-off from higher ground before it reaches your foundations.
Planning Resources
Mole Valley Planning
Verify local constraints for KT21, including tree preservation orders (TPOs) common in Ashtead.
Visit Portal →Surface Water Map
Check the government long-term flood risk map specifically for surface water pooling.
Check Postcode →Thames Water
Essential for build-over agreements if your extension crosses public sewers.
Developer Services →