Off-mains Drainage Services Including Cesspit Replacement & Septic Tank Installation in Horsham, Pulborough & the wider South East | CJ Groundworks


For over 35 years, the CJ Groundworks team has been handling septic tank installation and replacement for domestic, commercial and industrial clients throughout Kent, Surrey and Sussex. This is complemented by cesspit replacement and repair services, helping individuals and companies in areas such as Cranleigh, Horsham, Midhurst, Petworth and Pulborough establish a sanitary, compliant off-mains drainage system. A deep knowledge of quality products from leading manufacturers such as Clenviro and Klargester, ensures you won’t be let down by the capability and reliability of your infrastructure.

The aforementioned services are only provided by particular types of drainage company: those with the technical prowess required to install and maintain septic tanks and cesspits in line with a litany of rules and regulations, and ready access to powerful plant to expedite excavation and re-covering. We firmly tick both these boxes, while also providing exceptional project management, and the kinds of advice and assistance which makes the process of designing an off-mains drainage system as simple and straight-forward as can be.

Septic Tank Installation & Replacement


A septic tank is a crucial component of a wastewater treatment system, typically installed underground to collect and treat sewage from households or commercial properties that are not connected to a centralised system. Septic tank installation begins with a thorough assessment of the site, including soil type, water table level, and property layout. Excavation follows, creating a suitable space for the tank placement. The tank is carefully positioned, levelled, and connected to the property's plumbing system, before proper backfilling and compaction takes place to ensure stability and functionality. As both a drainage company and groundworks specialist, we’re capable of performing all aspects of septic tank installation to the most meticulous of standards.

Over time, septic tanks may require replacement due to various factors such as age, damage, or inadequate maintenance. Signs indicating the need for replacement include foul odours, sewage backups, and groundwater contamination. Our expert technicians conduct thorough inspections to determine the most appropriate replacement solution tailored to the property's needs and environmental regulations. Clients around Cranleigh, Horsham, Midhurst, Petworth and Pulborough choosing CJ Groundworks for a septic tank installation will benefit from a two-year guarantee, in addition to all relevant manufacturer warranties.

Cesspit Replacement & Repair


A cesspit, also known as a cesspool, is a sealed underground chamber designed to collect and temporarily store sewage and wastewater from a property. Over time, cesspits can deteriorate due to age, structural damage, or inadequate maintenance, necessitating replacement or repair. Installation or cesspit replacement involves excavation of the site, placement of the chamber, and connection to the property's plumbing system. Our experienced team ensures proper sizing and positioning to accommodate the property's needs while adhering to local regulations present in our areas of coverage, which include Cranleigh, Horsham, Midhurst, Petworth and Pulborough.

Throughout its lifespan, a cesspit may require various repairs to maintain functionality. Common issues include leaks, cracks, and blockages, which can lead to foul odours, contamination, and environmental hazards. Our comprehensive repair services address these issues promptly, utilising advanced techniques such as sealing, lining, and jetting to restore the cesspit's integrity and performance. In extreme cases, where repairs are simply not possible, we can provide cesspit replacement at distinctly competitive prices.

Trust CJ Groundworks, a veteran drainage company serving clients in all areas surrounding Horsham and Pulborough, with everything from septic tank installation to cesspit replacement. To discuss your requirements, call us today on 0788 175 7877.