Sewage Treatment Plant Installation Across Sussex, Surrey and Kent
CJ Groundworks installs sewage treatment plants for homes, rural properties, farms, holiday accommodation and commercial premises across Sussex, Surrey and Kent.
With more than 35 years of groundworks and drainage experience, our in-house team can manage the installation from the initial site assessment and excavation through to tank placement, drainage connections, backfilling and reinstatement.
We install new systems and replace older septic tanks or treatment plants, taking account of property usage, ground conditions, access and the proposed discharge method. You will receive clear advice on the work required, a detailed quotation and a system suited to the needs of your property.
/Definition
What is a Sewage Treatment Plant?
A sewage treatment plant is an off-mains drainage system used where a property cannot connect to the public sewer. Wastewater enters the plant and passes through a series of settlement, aeration and biological treatment stages before the treated effluent leaves the system.
The correct discharge arrangement depends on the site and may involve a drainage field, watercourse or another approved outlet. Ground conditions, available space, property occupancy and local environmental requirements must all be considered before a system is selected.
Compared with a conventional septic tank, a treatment plant processes wastewater to a higher standard. It can therefore be suitable for properties where an existing septic system is no longer adequate or compliant, subject to the required assessment and approvals.
/ Our Services
Sewage Treatment Plant Services
We provide a practical, end-to-end service for new installations, replacement systems and upgrades. The scope of work is tailored to the property rather than based on a standard package, helping ensure that the plant, drainage arrangement and installation method are appropriate for the site.
Full Design & Installation
We assess how the property will use the system, the expected daily flow, site access, ground conditions and the proposed discharge route before recommending a suitable plant.
Our installation service can include:
- Domestic sewage treatment plants
- Systems for farms, holiday lets and rural businesses
- Commercial treatment plants sized for higher usage
- Excavation, concrete bases and tank installation
- Inlet, outlet and drainage connections
- Backfilling and ground reinstatement
- Replacement of outdated or unsuitable systems
Where appropriate, we can install treatment plants from established manufacturers, including Klargester and Clenviro. The exact system will be selected according to the property, site findings and manufacturer requirements.
Site Assessment & Regulatory Compliance
A suitable installation begins with understanding the site. We inspect the available space, access for excavation equipment, ground levels, nearby buildings, boundaries, watercourses and the intended discharge location.
Depending on the project, the preparatory work may include:
- Reviewing ground conditions and drainage options
- Establishing the appropriate position for the plant
- Confirming access for installation and future emptying or servicing
- Planning inlet and outlet levels
- Identifying Building Control or environmental requirements
- Coordinating with relevant specialists or authorities where required
Any testing, applications or third-party professional input required for the project will be explained before work begins.
Upgrades & Replacements
An older septic tank or treatment plant may need replacing if it is failing, regularly backing up, producing odours, damaging the surrounding ground or no longer suitable for the property’s level of use.
We can inspect the existing installation, discuss the available options and complete the groundworks required for a replacement treatment plant. This may include removing or safely decommissioning the old system, installing the new plant, altering drainage runs and reinstating the affected area.
We regularly help owners of rural properties across Sussex, Surrey and Kent move from outdated off-mains drainage systems to modern treatment plants.
Repairs & Servicing
Regular inspection and maintenance can help identify problems before they lead to an overflow, breakdown or more extensive groundworks.
CJ Groundworks provides practical support for sewage treatment plants across Sussex, Surrey and Kent, including investigation of drainage faults, access problems, damaged connections and ground-related installation issues.
Contact us with the make of your treatment plant, its approximate age and a description of the problem. We will confirm whether the work is within our scope or whether a manufacturer-approved treatment plant engineer is required.
/Planning
When to Install a Sewage Treatment Plant
A sewage treatment plant may be suitable where:
- The property has no practical connection to the mains sewer
- A new home or conversion requires an off-mains drainage system
- An existing septic tank is failing or no longer suitable
- The number of occupants has increased
- A property is being converted into holiday accommodation
- A farm, equestrian site or rural business needs a dedicated wastewater system
- The existing discharge arrangement needs to be reviewed
Treatment plants can serve individual homes, groups of properties, holiday lets, glamping sites, agricultural buildings and commercial premises. The system must be correctly sized for its expected use and installed in a location that allows safe access for maintenance and emptying.
CJ Groundworks can assess the physical installation requirements and explain the groundworks involved before you commit to a system.
/ Our Mission
Why Choose CJ Groundworks for Your Installation?
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 Area
Sewage Treatment Plant Installation Areas
We install sewage treatment plants in:
- Cranleigh
- Horsham
- Midhurst
- Petworth
- Pulborough
- All surrounding areas in Sussex, Surrey, and Kent
Discuss Your Sewage Treatment Plant Installation
Planning a new sewage treatment plant or considering replacing an existing septic system?
Call CJ Groundworks on 07881 757877 or send us details of the property, postcode and current drainage arrangement. We will discuss the installation, arrange a site visit where required and provide a clear quotation for the agreed work.
/ FAQs
Frequently Asked Questions
A septic tank partially treats wastewater, while a sewage treatment plant uses aeration and biological processes to clean the water to a much higher standard—making it safe for discharge into watercourses.
Costs vary based on system size, ground conditions, and installation complexity. A domestic unit may range from £7,000.00 - £12,000.00 including installation. We provide transparent, fixed quotes with no hidden fees.
You may need to notify Building Control and, in some cases, obtain a discharge permit from the Environment Agency. CJ Groundworks manages all the necessary paperwork and approvals on your behalf.
Most installations take 3–5 days depending on access, weather, and soil conditions. We plan every project carefully to minimise disruption to your property.
We recommend annual servicing to ensure your system remains efficient and compliant. If you’re looking for reliable sewage treatment plant servicing East Sussex or domestic sewage treatment plant servicing near Surrey, CJ Groundworks provides trusted, affordable maintenance solutions.
/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
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