A Veteran Groundworks & Drainage Company in Horsham, Cranleigh, Midhurst & All Surrounding Locations | CJ Groundworks

Welcome to the website of CJ Groundworks, a trusted groundworks and drainage company serving domestic, commercial and industrial clients alike. Covering all locations throughout Sussex, Surrey and Kent - including Horsham, Cranleigh, Midhurst, Petworth and Pulborough - we provide a comprehensive range of services which takes in, but is not restricted to: septic tank installation, cesspit replacement, drainage installation, the integration of sewage treatment plants, and construction of building foundations and concrete bases.

Why Choose CJ Groundworks?

Our founder brings over 35 years of experience to bear on each and every project we’re tasked with, ensuring an unrivaled standard of workmanship, customer service and project management. As a family-run business, we keep everything in-house and refuse to bring in subcontractors, ensuring we’re in full control of the quality of work you’ll receive.

Carrying both employer and public liability insurance policies, we offer two-year workmanship guarantees on completed works, while upholding all manufacturer warranties on materials used. Clients in and around Horsham, Cranleigh, Midhurst, Petworth and Pulborough choosing us as their groundworks and drainage company of choice thus receive total peace of mind, further strengthened by the strong ties we have to industry leading manufacturers, such as Clenviro and Klargester.

If you’d like to discuss a project you have in mind in person, whether it’s septic tank installation, sewage treatment plant / cesspit replacement, drainage installation, or something on the groundworks side of things such as the construction of building foundations or concrete bases, we urge you to get in contact with us at your earliest convenience to book a consultation. We’ll welcome you to visit our office or yard, or visit your own home, site or premises - whatever your preference. Want to see first-hand examples of projects we’ve completed? We’ll be happy to take you to previous job sites upon request.

To learn more about the different sides of what we do, and how we manage to cater to all requirements while tackling a diverse range of works, navigate our website. Dedicated pages go into further detail on the services listed below, from feasibility studies to complete drainage commissions, while our Gallery and Testimonials pages evidence the fantastic work our team carry out on a week-to-week basis.

Our Services


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Off Mains Drainage

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Other Services

Sewage Treatment Plant

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Septic Tanks & Cesspits

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Concrete Bases

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Our Drainage Services

As a seasoned drainage company serving homeowners, and commercial / industrial entities from Horsham to Cranleigh, Midhurst to Petworth and onward to Pulborough, we solve problems such as blocked drains, outdated sewage systems, and non-compliant systems which are overdue an update. Typical services we provide include:

  • Sewage Treatment Plant Installation
  • Cesspit Replacement & Cess Pool Installation or Repair
  • Septic Tank Installation & Replacement
  • The Solving of All Types of Drainage Related Issues

Our Groundworks Services

Complementing our drainage services are a number of standalone groundworks services, which help prepare domestic, commercial and industrial sites in and around Horsham, Cranleigh, Midhurst, Petworth and Pulborough for further development, or handover for end use. These include:

  • Building Foundations
  • Rafts
  • Underpinning
  • Block & Beam Works
  • Roadways
  • Retaining Walls
  • Soakaways
  • Drainage Fields


Searching for a proven groundworks and drainage company to undertake anything from domestic works in Horsham, to commercial or industrial works in Cranleigh? CJ Groundworks wants to hear from you. Pick up the phone and call 0788 175 7877 today.