Groundworks and Drainage Contractors in Sussex, Surrey and Kent
CJ Groundworks is a family-run groundworks and drainage company based near Horsham, West Sussex. With more than 35 years of industry experience, we undertake domestic, commercial and industrial projects throughout Sussex, Surrey and Kent.
Our in-house team carries out site preparation, excavation, foundations, concrete bases, drainage installation and off-mains sewage work. From the initial site visit through to excavation, installation and reinstatement, you deal directly with an experienced local contractor.
Need advice on a planned project or an existing drainage problem? Contact us to arrange a site visit and receive a clear, itemised quotation.
/ Our Services
Our Groundworks and Drainage Services
We provide practical groundwork and drainage solutions for homeowners, builders, developers, rural properties and commercial sites. Every project is assessed individually, with recommendations based on access, ground conditions, drainage requirements and the intended use of the site.
Groundworks and Site Preparation
- Site clearance and ground reduction
- Excavation and earthmoving
- Ground levelling and grading
- Foundation excavations
- Oversite preparation
- Concrete bases for garages, sheds and garden rooms
- Service trenches and associated drainage work
Drainage Installation
- New foul and surface-water pipework
- Drainage connections and diversions
- Soakaways and land drainage
- French drains and channel drainage
- Stormwater management systems
- Drain repairs, CCTV surveys and high-pressure jetting
- Septic tanks, cesspits and sewage treatment plants
Septic Tanks and Off-Mains Drainage
Properties without access to a public sewer need an appropriate system for collecting, treating or discharging wastewater.
- Sewage treatment plants
- Septic tanks
- Cesspits
- Drainage fields and pipework
- Pump chambers and controls
- Existing off-mains drainage
We begin by reviewing the property, expected usage, site access, ground conditions and potential discharge route. Where additional permissions, testing or specialist design work may be required, this will be identified before installation begins.
Concrete Bases for Sheds and Outbuildings
We construct level, durable concrete bases for sheds, garages, workshops, garden rooms and other outbuildings.
Each base is prepared according to the size, weight and intended use of the structure. Work may include excavation, sub-base installation, compaction, formwork, reinforcement, damp-proofing and concrete finishing.
Before quoting, we check access, levels, drainage and the volume of excavated material that must be removed. This helps avoid unexpected costs once work has started.
Foundations for Extensions, Garages and New Builds
We excavate and construct foundations for house extensions, garages, outbuildings and new-build projects.
Depending on the approved design and site conditions, work may include strip foundations, trench-fill foundations, raft preparation and reinforced concrete work. We can also coordinate associated drainage, service trenches, oversites and ground preparation.
Foundation dimensions and specifications should follow the approved plans and the requirements of the relevant building-control or engineering professionals.
/ Our Mission
Why Choose CJ Groundworks?
35+ Years of Experience
Proven expertise across all aspects of groundworks and drainage.
In-House
Team
No subcontractors; every project is handled by our qualified, insured operatives.
Fully Insured &
Guaranteed
Public and employer liability cover, plus a 2-year workmanship guarantee.
Compliant &
Certified
Work completed to UK Building Regulations and Environmental Agency standards.
Local
Expertise
Covering Sussex, East Sussex, Surrey, and Kent, including Horsham, Cranleigh, Midhurst, Petworth, and Pulborough.
/ Our Clients
Groundworks for Homes, Developments and Commercial Sites
- Homeowners: Groundworks for extensions, garden buildings, driveways, drainage improvements and off-mains sewage systems.
- Builders and Developers: Excavation, foundations, drainage, concrete work and site preparation completed as part of a wider construction programme.
- Commercial and Industrial Clients: Groundworks, drainage infrastructure, concrete bases and site preparation for operational and development sites.
- Rural Property Owners: Septic tanks, sewage treatment plants, drainage fields, access preparation and wastewater systems for properties outside the mains sewer network.
Our experienced team can adapt to tight timelines, limited access, and complex site conditions — always delivering safe, efficient, and compliant groundworks.
/ Our Portfolio
Recent Groundworks and Drainage 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
Groundworks Across Sussex, Surrey and Kent
We’re a Horsham-based groundwork company covering:
- Cranleigh
- Horsham
- Midhurst
- Petworth
- Pulborough
- All surrounding areas in Sussex, Surrey, and Kent
Arrange a Site Visit and Quotation
Tell us what work you are planning, where the property is located and when you would like the project to begin.
For the most accurate quotation, we will normally need to review site access, ground levels, existing drainage and the proposed scope of work. You will then receive a clear quotation outlining the work discussed.
Call 0788 175 7877, email chris@cjgroundworks.com, or send an enquiry through the form.
/ FAQs
Frequently Asked Questions
A groundwork company prepares your site for building or installation. This includes excavation, levelling, foundation laying, drainage works, and concrete base construction. Our goal is to ensure your site is safe, stable, and ready for the next phase of construction.
Costs depend on the project’s complexity, soil conditions, and site access. A small concrete shed base may cost a few hundred pounds, while complete foundation and drainage groundworks in Kent will cost more. We always provide detailed, itemised quotes.
Yes — we carry both public and employer liability insurance, and all our operatives are fully qualified. Our installations meet all Building Regulations and Environmental Agency standards.
Absolutely. We specialise in septic tank installation in Kent, cesspit installation, and sewage treatment plant servicing in Surrey. We also handle system upgrades and compliance testing.
We cover Sussex, Surrey, and Kent, focusing on Horsham, Cranleigh, Midhurst, Petworth, and Pulborough. If you’re unsure whether we work in your area, just give us a call — we likely do.
/Our Contact
Ready to break ground?
Get in touch with CJ Groundworks today on 0788 175 7877 for expert advice and a free quotation. Your trusted groundwork company in Sussex, Surrey, and Kent — delivering quality from the ground up.
Address
CJ Groundworks, Lower Batchelors, Emms Lane, Barns Green, West Sussex, RH13 0QH.
/ Our Testimonials
What clients say about us
/ From the blog
Practical Groundworks and Drainage Advice
Soil Grading and Levelling: Why It Matters
Soil grading and levelling are essential parts of site preparation because they shape the ground before construction, drainage, landscaping or concrete work begins. Good levels help water move in the right direction, create stable working areas and reduce the risk of future settlement, flooding and uneven surfaces. Many people think
Concrete Base for a Shed: Do You Need One?
A concrete base for a shed is often the best choice if you want a stable, level and long-lasting foundation. While not every small garden shed will need a full concrete base, most sheds benefit from a properly prepared base that keeps the structure supported, dry and secure. A shed
Soil Type and Foundations: Why It Matters
Soil type and foundations are closely linked because the ground beneath a building determines how well the structure will be supported. Before choosing between strip foundations, trench fill foundations, raft foundations or piled foundations, it is important to understand the condition, strength and behaviour of the soil on site. A