Groundwork Company in Sussex, Surrey & Kent
Welcome to CJ Groundworks, a veteran groundwork company serving domestic, commercial, and industrial clients across Sussex, Surrey, and Kent. With over 35 years of experience, our family-run team delivers high-quality, fully insured groundworks and drainage solutions tailored to your project’s unique needs.
We’re proud to be the first choice for a groundwork company in towns like Horsham, Cranleigh, Midhurst, Petworth, and Pulborough. Whether you need a solid base for a garden room or a fully integrated off-mains sewage system, we’ve got it covered — from excavation to completion.
/ Our Services
Our Groundworks & Drainage Services
As a full-service groundwork company, CJ Groundworks handles everything from first dig to final levelling.
We support property developers, homeowners, and businesses with a wide range of services, including:
Groundworks & Site Preparation
- Site clearance & levelling
- Excavation and earthworks
- Building foundations: strip, raft, trench fill & piled
- Concrete bases for sheds, garages & garden rooms
Drainage Installation
- Foul and surface water drainage systems
- Septic tanks and cesspit installations
- Sewage treatment plants (STPs)
- Soakaways, French drains & stormwater systems
- Drain repair, CCTV surveys & jetting
Off-Mains Drainage Specialists
Not connected to mains drainage?
We specialise in off-grid sewage solutions, including septic tank installation, cesspit emptying, and sewage treatment plant systems designed for long-term compliance.
Concrete Bases
We lay robust, level concrete bases for sheds, workshops and outbuildings — finished with Type 2 sub-base and damp-proof membranes. Our concrete shed bases are tailored to your structure’s size and weight.
Building Foundations
From pad foundations for extensions to piled foundations on challenging ground, we provide structurally sound solutions to suit any soil condition.
/ Our Mission
Why Choose CJ Groundworks?
35+ Years of Experience
A long-standing reputation built on expert workmanship.
In-House
Team
No subcontractors; we keep all trades under one roof.
Fully Insured &
Guaranteed
No subcontractors; we keep all trades under one roof.
Compliant &
Certified
All works carried out to UK building regs and environmental standards.
Local
Expertise
Proudly serving Sussex, Surrey & Kent.
/ Our Clients
Who We Work With
As an experienced groundwork company, we work with:
- Homeowners developing property
- Commercial developers and contractors
- Industrial clients with civil engineering needs
- Rural clients needing off-mains drainage
We also assist with ground stabilisation for new builds, hard landscaping prep, and foundations for modular buildings. No matter the size of the job, our experienced team can adapt our services to suit tight timelines, restricted access, and challenging terrain.
/ Our Portfolio
Example Projects
Our portfolio includes:
Garden room concrete bases in Horsham
Sewage treatment plant installations in Cranleigh
Full groundworks packages for new builds in Midhurst
Septic tank replacement and drainage upgrades in Petworth
We’re proud to maintain long-term relationships with local contractors and property owners who trust us to deliver results, time and again.
/ Our Locations
Areas We Cover
We’re a Horsham-based groundwork company covering:
- Cranleigh
- Horsham
- Midhurst
- Petworth
- Pulborough
- All surrounding areas in Sussex, Surrey, and Kent
Get a Free Quote
Give us a call on 0788 175 7877 or email chris@cjgroundworks.com to discuss your project. We’re happy to meet you on-site, at your property or at our yard — whatever works best. No obligation, just straight-talking expert advice.
/ FAQs
Frequently Asked Questions
A groundwork company prepares the site for construction or installation. This includes excavation, levelling, foundation construction, drainage installation, and building concrete bases. We ensure the site is stable, safe, and ready for the next stage of development.
Costs vary depending on the scope of work, soil conditions, and site accessibility. For example, a simple concrete shed base may cost a few hundred pounds, while complex drainage and foundation works for a new build will run higher. We provide transparent, itemised quotes tailored to your project
Yes — we carry both employer and public liability insurance, and all our operatives are fully trained. Our installations comply with current Building Regulations and Environmental Agency requirements.
Absolutely. We specialise in off-mains drainage, including septic tank installation, cesspits, and sewage treatment plants. We also handle servicing, upgrades, and compliance checks.
We operate throughout Sussex, Surrey, and Kent, focusing on Horsham, Cranleigh, Midhurst, Petworth, Pulborough and nearby areas. If you're unsure if we cover your location, just ask — chances are, we do.
/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