About CJ Groundworks
CJ Groundworks is a family-run groundwork and drainage company based in Barns Green, near Horsham. With more than 35 years of industry experience, we support homeowners, builders, developers and commercial clients across Sussex, Surrey and Kent.
Our team delivers foundations, concrete bases, excavation, drainage and off-mains wastewater systems with practical advice, direct communication and a high standard of workmanship. From the first site visit to the final handover, your project is managed by people who understand the work and take pride in completing it properly.
/Our Story
Built on 35 Years of Groundwork Experience
CJ Groundworks was founded by Chris Johnson after more than 35 years working within the groundworks, construction and drainage industry. What began as a local, hands-on business has developed into an experienced family-run team serving domestic and commercial customers across the South East. Our work includes:
Building foundations for extensions and new structures
Concrete bases for sheds, garages and garden rooms
Site preparation, excavation and ground levelling
Foul-water and surface-water drainage
Drain surveys, repairs and replacement systems
Septic tanks, cesspits and sewage treatment plants
We remain directly involved in every project. Customers deal with the people responsible for assessing, planning and completing the work rather than being passed between sales teams, subcontractors and office departments.
How We Work
What Makes Us Different
Direct, In-House Service
No middlemen. No subcontractors. Just our experienced team on every job — fully insured, fully accountable, and fully focused on your project.
Honest Advice
We won’t upsell you. We won’t pressure you. We’ll simply assess what’s needed, explain your options, and deliver the best solution at a fair price.
Workmanship That Lasts
Every trench, pipe, base and foundation we install is designed to last. That’s why we back all our work with a 2-year workmanship guarantee.
Fully Compliant & Insured
All work is carried out to UK Building Regulations and Environment Agency standards. We hold full public liability insurance for your peace of mind.
Meet the Founder
Chris Johnson
Chris Johnson has worked in construction, groundworks and drainage since the 1980s. His experience spans practical site work, civil engineering, excavation, foundations and the installation of drainage and off-mains wastewater systems.
After decades working within the industry, Chris founded CJ Groundworks to provide customers with a more direct and dependable service. He remains personally involved in site assessments, project planning and the delivery of work alongside the wider family team.
His approach is simple: treat every site with the same care and attention you would expect on your own property.
/Our Clients
Who We Work With
CJ Groundworks supports a broad range of domestic, rural and commercial customers, including:
Homeowners planning extensions, garden rooms, concrete bases or drainage improvements
Self-builders requiring excavation, foundations and below-ground drainage
Builders and developers looking for dependable groundwork support
Rural property owners installing or replacing off-mains wastewater systems
Landlords and commercial clients managing drainage, access or concrete works
Surveyors, engineers and other construction professionals coordinating specialist site work
Every customer receives a clear scope of work, practical communication and a service tailored to the site—not a generic package.
/ Our Area
Groundwork Contractors Serving Sussex, Surrey and Kent
We’re proud to be based near Horsham, with easy access to:
- Cranleigh
- Midhurst
- Petworth
- Pulborough
- All surrounding areas in Sussex, Surrey, and Kent
Speak Directly with Our Groundworks Team
Planning foundations, drainage, excavation or an off-mains wastewater installation? Speak directly with our family-run team for practical advice and a clear next step.
Call 0788 175 7877, send us your plans or photographs, or arrange a site visit to discuss the work in person.
/Our Contact
Ready to break ground?
Get in touch with CJ Groundworks today to discuss your project and receive a free, no-obligation quotation. Our team is here to answer your questions and provide expert advice tailored to your needs.
Address
CJ Groundworks, Lower Batchelors, Emms Lane, Barns Green, West Sussex, RH13 0QH.
/Our Testimonials
What clients say about us
/ From the blog
Latest Articles
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Buying a property with off-mains drainage can be perfectly manageable, but it is important to understand exactly what system serves the property before you commit. Unlike a property connected to the public sewer, an off-mains home relies on a private system to manage wastewater. This may be a septic tank,
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Soakaways are underground drainage systems designed to collect surface water and allow it to gradually disperse into the surrounding ground. They are commonly used to manage rainwater from roofs, driveways, patios, paths, gardens, yards and other hardstanding areas where water needs to be moved away safely. In simple terms, a
Soil Grading and Levelling: Why It Matters
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