Septic Tanks & Off Mains Drainage Windsor
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Services we offer in Windsor
Off-Mains Drainage Compliance Windsor
Private drainage around Windsor can involve a wide range of property types, from older homes and larger gardens to rural-edge properties, estate buildings and Thames Valley sites where the drainage history is not always clear. Some properties use septic tanks, while others rely on sewage treatment plants, drainage fields, shared systems or older pipework that may have been altered over time. Boxall Ward helps homeowners, buyers, sellers, builders and professional advisers understand whether an off-mains drainage system appears suitable, serviceable and compliant. This can be particularly important before a property sale, renovation, extension or change of use, where a private drainage issue can become a much larger problem if it is left until late in the process. A compliance check can help establish what type of system is installed, where it discharges, whether there are visible signs of failure and whether further investigation or remedial work may be needed. For more information, see our dedicated page on off-mains drainage compliance.Septic Tank Installation and Replacement in Windsor
Older off-mains drainage systems do not always remain suitable for the way a property is now used. A Windsor property may have been extended, renovated, divided, modernised or brought into heavier use since the original private drainage system was installed. Where an existing septic tank is damaged, undersized, poorly performing or no longer suitable for the discharge arrangement, replacement may need to be considered. Boxall Ward can advise on septic tank replacement and sewage treatment plant installation for properties in Windsor and surrounding Thames Valley areas. Where appropriate, a modern sewage treatment plant may provide a more suitable long-term solution than an older septic tank, depending on the site, ground conditions, access and discharge options. Boxall Ward is experienced in assessing off-mains drainage sites, planning practical installation routes and carrying out the excavation and groundworks required for a reliable replacement system. The company is also a distributor of Matrix sewage treatment plants, giving customers access to modern treatment plant options for domestic and light commercial use.Septic Tank Repairs Windsor
A drainage fault does not always mean that the whole system needs to be replaced. Problems with septic tanks and sewage treatment plants can be caused by damaged pipework, blocked inlets or outlets, failed pumps, broken covers, poor access, mechanical faults or a drainage field that is no longer coping properly. Boxall Ward carries out off-mains drainage repairs for septic tanks, sewage treatment plants and associated pipework. For Windsor properties, this can be especially useful where private drainage is tucked away in gardens, paddocks, driveways or outbuildings, and where the route of the pipework is not immediately obvious. The first step is to understand the cause of the problem properly, rather than guessing. A repair-led investigation can help establish whether the system can be restored to reliable use or whether a more significant upgrade is likely to be required. Early action can also reduce the risk of a manageable fault turning into a disruptive and expensive drainage issue.Septic Tank Survey Windsor
A septic tank or sewage treatment plant can become a major concern during a property transaction if its condition, discharge route or compliance position is unclear. Boxall Ward provides homebuyer septic tank surveys for people buying properties with private drainage. For properties in and around Windsor, this can be particularly valuable where the home is older, larger, rural-edge, close to sensitive land or has drainage arrangements that are not fully documented. A specialist survey can help identify the type of system in place, the visible condition of the main components, whether there are signs of failure and whether the discharge arrangement may need further attention. This gives buyers, sellers, estate agents and conveyancers clearer information before exchange, rather than leaving private drainage questions until after completion. Where necessary, Boxall Ward can also advise on repairs, replacement options or further investigation.Groundworks Windsor
A reliable off-mains drainage system depends on careful groundworks as well as the tank or treatment plant itself. Excavation routes, pipe runs, drainage fields, access for machinery and reinstatement all affect how well the system performs and how smoothly the work is completed. Boxall Ward provides groundworks for septic tank installations, sewage treatment plant installations, drainage repairs and associated off-mains drainage projects. Around Windsor, this may include work for larger gardens, rural properties, renovation projects, private land, older homes and sites where access or ground conditions need careful planning. The aim is to install or repair the drainage system properly while keeping disruption to the surrounding property as controlled as possible. Good groundworks help ensure the finished system is practical, serviceable and suitable for the property it serves.Certified Installers Windsor
Choosing the right off-mains drainage contractor matters, especially where the system serves a larger property, a renovation project, a shared drainage arrangement or a home being bought or sold. Boxall Ward works with established sewage treatment plant and drainage product manufacturers and can advise on suitable system options for the site. The company is experienced with products from manufacturers including Harlequin Manufacturing and Marsh Industries, and is also a distributor of Matrix sewage treatment plants. For Windsor customers, this means Boxall Ward can help with both the practical installation work and the wider decision about what type of system is likely to be suitable. The right solution depends on the property, the number of occupants, available land, discharge options, access, ground conditions and any compliance issues that need to be resolved. Boxall Ward can assess the situation and recommend a practical route forward.More About Our Core Services
Areas We Serve In Thames Valley
If your area isn’t listed, we may still be able to do the work – just call us on
01903 815 377
and we’ll be delighted to discuss your needs and our solution.
| Newbury | Reading | Wokingham |
| Bracknell | Maidenhead | Windsor |
| Henley-on-Thames | Marlow | Ascot |
| Twyford | Wargrave | Crowthorne |
All Areas We Cover:
West Sussex | East Sussex | Surrey | Hampshire | Kent | New Forest | Thames Valley
Check out our Homebuyer Surveys (Septic Tank Surveys)
Happy Customers
Windsor Off Mains Drainage FAQ
In order for wastewater to be taken away from your property, it will be connected either to a network of pipes leading to a main sewer, or to its own private drainage system, also known as off mains drainage. These properties are typically situated in more rural locations where a connection to a main sewer is not possible.
Your sewage treatment plant has to be 5 metres away from trees, fences and hedges, 10 metres away from a watercourse or stream, and 50 metres away from any lake or foreshore. Last but not least, it has to be 7 metres away from your housing and 4 metres away from a wall or a building.
Areas we serve include: West Sussex, East Sussex, Hampshire, the New Forest, Surrey, Kent, Berkshire and parts of Wiltshire and Dorset. If you are unsure whether we cover your area, please contact us and we’ll be happy to advise.
There are three different types of tanks:
- Septic Tanks
- Cesspits
- Sewage Treatment Plants
Septic tank:
A septic tank does not have any mechanical parts, and it doesn’t perform any ‘treatment’ of the waste. Instead, the waste enters the tank from the property, then separates into three different layers. The middle layer of separated waste water then leaves the tank, typically into a soakaway system.
A soakaway system is typically a network of slotted or perforated pipes, which allow the waste water to percolate through the sub soils without causing a pollution.
The remaining contents of the tank are then removed at regular intervals by a tank emptying company.
Cesspit:
A cesspit is literally just a holding tank for the waste from your property. Waste goes in and stays there until the tank is emptied. There is no treatment of the waste that goes in. A cesspit will need emptying on a regular basis.
Sewage Treatment Plant:
A sewage treatment plant is the most modern form of off mains drainage tank.
Powered by an electricity supply, a sewage treatment plant provides treatment of the waste. This means that the waste water that leaves the tank is cleaner than that which would come from a septic tank. For this reason, it is allowed for a sewage treatment plant to discharge straight to a ditch or watercourse. An STP will also require emptying, but not as regularly as a cesspit.
Septic Tank: should generally be emptied once a year. The frequency may vary depending on the tank’s capacity and usage.
Cesspit: requires more frequent emptying, depending on its capacity and usage. As it stores all wastewater without an outlet, the level should be monitored regularly.
Sewage Treatment Plant: should be serviced annually and emptied in accordance with the manufacturer’s recommendations and the servicing engineer’s advice.
The manufacturers’ guarantee gives the lifespan of 25 years
No, all will need emptying at some point.
If you’re installing a new septic tank in a domestic or commercial property, you will need planning permission from your local authority. If you’re simply replacing an old one, however, there’s no need to seek further permission.
Government’s General Binding Rules.
You can read more about planning permission for drainage systems on the official Planning Portal.
The installation of new sewage treatment plants and associated drainage. We also specialize in all forms of groundworks.
From single house applications to multi-user commercial sites, we undertake all aspects of the installation from system design, excavations, electrical installation through to final landscaping.
We offer a tailored annual service agreement to provide scheduled service visits and call-out cover in the event of a problem.
South East UK: Hampshire, Berkshire, Surrey, Sussex, Kent (South of the M25)
We have over 30 years’ experience in the drainage industry.
We are a relatively small, family run firm, and like to think we give a very personal service to our customers. Giving genuine advice without pressure to purchase.
Yes, all our installations are carried out to the very highest standards and fully comply with Building Control and Environment Agency requirements. All installations are completed using the government’s General Binding Rules https://www.gov.uk/government/publications/small-sewage-discharges-in-england-the-general-binding-rules/general-binding-rules-for-small-sewage-discharges-ssds-with-effect-from-2-october-2023
Certainly, we have installed a number of bespoke tanks which have had to be customized due to a lack of space or access issues.
All our tanks are installed to the correct manufacturers’ recommendations, surrounded in concrete with all the drainage laid to the correct fall for the site on a bed of 10mm shingle. An on-going service contract is offered with all new installations.
Call the office on 01903 815377 (or email on enquiries@boxallward.co.uk) and speak to our office staff who will be able to take your details. We can then arrange for Andrew Boxall to visit your site and discuss your specific requirements. After his visit a quote will be produced to provide a solution to your needs.
This is part of the annual service agreement. If the client does not have a service agreement we can attend as a one-off call-out for a fee. We work 5 days a week – Mon-Fri and commit to attend an emergency within 48 hours of the initial call.
