Drainage Systems
Certified surface and sub-surface drainage solutions for construction projects across Exeter, Devon and the South West.
Expert Drainage Installation for Safe, Sustainable Sites
A well-designed drainage system is essential for managing water safely and preventing future site issues.
At JMJ Groundworks, we specialise in the installation of high-performance drainage systems that meet Building Regulation Part H and support long-term site resilience. Whether managing groundwater below a new build or surface runoff on a commercial yard, we provide fully certified solutions across Exeter and Devon that are built to last.
Why Choose JMJ for Drainage Works?
Our drainage packages combine technical expertise, quality materials, and precise execution.
Technical Expertise
We assess soil reports, water tables, and CAD drainage layouts to ensure precise gradients, flow rates and chamber locations.
High-Quality Materials
WRAS-approved pipework, chambers and geotextiles sourced from trusted suppliers, all backed by manufacturer warranties.
Advanced Plant & Testing
Our team uses GPS-guided trenchers, laser-levels and on-site compaction testing. CCTV footage and test certificates are included as standard.
QHSE-Driven Approach
Every installation follows a full Health & Safety plan, with risk assessments and environmental controls like silt fences and wash-down areas.
What we offer
We design and install both sub-surface and surface water drainage systems to suit your site conditions and project scope.
Sub-Surface Drainage
Perforated Land Drains (French Drains)
Gravel-filled trenches containing perforated pipework to disperse groundwater away from structures.
Soakaways & Attenuation Systems
Crate or void-based systems that store and slowly release rainwater into the ground, preventing surface flooding and sewer overload.
Surface Water Drainage
Channel & Trench Drains
Surface-level linear drains with grates, ideal for collecting runoff in driveways, yards and loading bays.
Gullies & Inspection Chambers
Installed at low points to collect water and allow for easy maintenance and CCTV access.
Combined Sewer Connections & SUDS
We liaise with local authorities to carry out foul and storm sewer connections and install Sustainable Drainage Systems (SUDS) where required. Options include:
Swales
Permeable paving
Rainwater harvesting
Green infrastructure integration
Need groundworks in Exeter and Devon?
Whether you’re managing a multi-phase development or a one-off infrastructure upgrade, we’re ready to help.