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Sewage Treatment Plant Installations by expert installers. Free no-obligation quotes.

With recent legislation changes and continued environmentally-focused regulation, Septic Tanks are a thing of the past. Sewage Treatment Plants are the future. Call the expert installers on 0800 3101092 to arrange a FREE quote or contact us here.  


sewage treatment plant intaller


Sewage Treatment Plant Installations by expert installers. 

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Call the expert installers on 0800 3101092 to arrange a FREE quote or contact us here.  

Why Homeseptic Sewage Treatment Plant Installers? 

Homeseptic is an intentionally small, professional installation and maintenance company. We operate a maximum of two jobs per week. We do not outsource our jobs. Each of our jobs is led by one of our installation directors, who have a vested interest in the company and have at least 20yrs experience in the drainage sector. This means a director/ expert engineer will be on-site every day leading your job. 

We will not send a salesman. The director who will eventually carry out your job will come to visit at the quote stage. You’ll have a chance to meet them and talk to someone who is an actual expert in the area, rather than someone whose only interest is to sell you what’s best for them. This prevents two things. Firstly, engineers turn up to a job and realise the salesman has sold completely the wrong system or an impossible install that will not work.

Secondly, the benefit of having a chance to meet the person who will actually undertake your installation prevents the standard formula of a salesman followed by inexperienced, installation teams on minimum wage.

We are a group of friends who grew up together and set up Homeseptic intentionally to be different. We grew tired of the sales-led drainage culture where the customer and the quality of work are treated as incidental. Our ambition is to come and meet great people and do a great job.

What should you look for when choosing an Installer? 

We are obviously a little biased and would, of course, choose ourselves but here are our recommendations.

  • Look to get at least 3 quotes. Check these quotes are from Ltd companies. There are lots of one-man-band installers that pop up on Google Ads and then disappear after taking deposits. You can check if a company is Ltd here
  • Insist that you meet the engineer who will undertake the job at the quotation stage. If the person is not going to do your job they are a salesman. One of the main drivers of our setting up this company is to get away from the Salesman.
    • The main problem with Sales led quotations is the Salesman are only interested in getting the sale.
    • They could not install a plug. This applies to all the salesmen we have met in this sector. Hair products and the latest fashions are normally their things.  As well as getting the unsuspecting customer to hand over their money. 
    • They will tell the customer they can have whatever they want. The engineer then turns up and has to try and turn an impossible dream into a reality.
    • This leads to upset customers and systems that do not work properly. Moreover, these salesman-led businesses often do not really have any trained engineers. They just send out the cheapest groundworkers and agency staff they can find. These laborers don’t really care about the customer or the company and will generally undertake a poor install. 
  • Do a little research, our guide to buying a sewage treatment plant is a good start, as well as reading the rest of this page.  Another essential reading is our Summary of the General Binding Rules for Septic Tanks and Sewage treatment plants.
  • Avoid the local farmer and tarmac company, Sewage Treatment Plants need an expert to install them. 
  • Look at the finances of the company that is coming out to visit. Every Ltd company has to file their accounts on Companies House. So once you have found the company, click on Filing History. This will show a list of all of the statutory documents, find the last set of accounts, look at the pdf. Find the page with the Balance Sheet in the heading.  There will be a line that says Total Assets less Current Liabilities. If the number here is in brackets (£,0000) It means the company has debts that are due in the next year which exceeds the total value of the whole company.  These companies are not solvent, their warranties are meaningless, and whatever you do not pay them a deposit! If their Total net assets are in brackets it means they are also heavily in debt. We do not have an office, we do not have any debt or borrowings, and our overheads are minimal. In short, we will be around as long as our bodies let us work. Please see our full guide on this. 
  • Ensure that your job will not be outsourced by the company that visits. Again ask to meet the person who will carry out your job. 
  • Prices may be different, understand why. It may be that a cheaper install option has been chosen. This will cost you far more in the future. 

Homeseptic Ltd. is rated 4.8 out of 5 based on 28

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The Sewage Treatment Plant Installation journey with Homeseptic.



We offer a quick easy and professional installation service with all the key features and guarantees you would expect at market-leading prices:

  • You get in contact and arrange a FREE quotation.
  • We visit, discuss the options available to you and carry out a site assessment. At this point, you may require a percolation test, we will discuss this option if necessary with you as there will be a cost associated. 
  • We send you our FREE quotation.
  • If you would like to proceed with the work we carry out a full survey of your property and perform a percolation test to ensure our preferred solution is viable.
  • We arrange an Installation date
  • The installation starts, and we normally book a full week for the job.
  • On the first day of the installation, the lead engineer (who you will have already met) will take you through the planned schedule of work. Generally, you will need to be available on Friday for sign-off. 

As part of the Installation, we will:

  • Firstly install and configure a first-class sewage treatment system that complies with the general binding rules.
  • We Liaise with the environment agency, and local council building control on your behalf to register your new system and facilitate a permit if it is required.
  • Arrange a building inspector for final approval and issue of a building regulations certificate.
  • Supply you with all relevant manufacturer’s instructions, warranties, and a maintenance schedule for the upkeep of the tank.
  • Offer our optional servicing and maintenance contract.
  • Provide you with a 2-year guarantee on our groundwork.
  • Issue you with a certificate of completion for the installation and a part P electrical connection certificate.

How far from my house or a dwelling does a Sewage Treatment Plant or Septic tank have to be installed?

Building Regulations state that a Sewage Treatment Plant or Septic Tank must be installed at least 7 meters from any habitable building. If this is not possible at your site, you will need to speak to your Building Control inspector to see if an exception can be made. Generally, if you have no other option for installation, then the 7-meter rule can be compromised. If however, you want the tank closer for aesthetic or non-essential reasons the 7-meter is unlikely to be compromised.

As part of all our Installations, we include guaranteed building control sign-off. This is achieved through consultation with our professional partners to ensure a hassle-free and compliant installation.

Sewage Treatment Plant Installers
A Marsh Ensign Shallow 8pe

In the adjacent picture, you can see a Marsh Ensign Shallow 8pe being lowered into place. The shallow-style tank is used in locations with a high water table or where ground conditions are poor, for instance running sand. 

The Ensign range is a very versatile and reliable range. The system is a simple aerator meaning there are no complex electronics to go wrong. However, on the flip side, the effluent quality is not as good as a batch cleaner. The effluent quality, however, is well within the limits set by the relevant British Standard and this factor is only of concern for instance if you are looking to offset or minimise Nitrate outputs. 

The Marsh tank comes with a 25yr structural guarantee and a 2yr warranty on parts. We supplement this with a 2-year guarantee on our groundworks and installation. The Tank is constructed of glass fibre and is tested and compliant with BS EN12566. The tank uses a highly efficient compressor to create the correct conditions for optimal aerobic digestion and treatment. Electrical running costs are estimated at between £60 and £90 per annum.

Some Common Questions 


A Sewage Treatment Plant does not necessarily need a drainage field. A Sewage Treatment Plant can discharge directly to a drainage ditch, watercourse, or river. Permission from the EA will only be needed if this discharge exceeds 5m squared. 

As part of a septic tank system, the soakaway treated the effluent. If discharging to ground the written rules demand you have a traditional Drainage Field which can be slightly smaller than that attached to a Septic Tank. Bizarre I know, as the effluent is already treated.  The Environment Agency allows you to pump the waste straight to streams that our children splash in during the summer but are strict when discharging to the ground. Fortunately, common sense can prevail. 

With consultation with Building Control, Infiltration tunnels can be used which vastly reduce the size of discharge to the ground. Infiltration tunnels also allow a much better functioning system. They also reduce the cost. In reality, most people cannot physically fit drainage fields in their gardens in line with the Environment Agency’s guidelines. We can walk you through the options available here.


This depends on several factors. The main factors are the size and type of tank required, the type of discharge available, and ground conditions. For a 4-bed house with a drainage ditch available and no adverse ground conditions, you are looking at between £8k and £10k for a basic tank system. If discharging to ground the cost for the same scenario would likely be between £10k and £12k. All prices exclude VAT.


If you are building a new house then yes. Should you have a septic tank already then Building Control sign-off will be sufficient unless you are looking to change the discharge point significantly. If you live in an area of AONB or a national park then special permissions may be needed. 

We will advise you of any specific requirements at the quote stage. 

What type of sewage treatment plant do I need?

The type of sewage treatment plant needed for your property depends on a number of variables.

Firstly the size of the property and how many occupants, essentially how much effluent needs treating. Trying to economise by using a smaller tank can lead to extra costs from a failing system due to overloading.

Soil type and absorption rate are very important factors that must be taken into account. We can advise on this and will do a percolation test before we install a system. This will tell us the soil absorption rate which we use to determine how large the soakaway must be. We also need to consider the water table as this can have a massive impact on any installation. 

The cost will also be a consideration for most.

We try to offer, conditions dependent, a Bronze, Silver, and Gold tank option on the tank type. As you would expect the Gold option is the most expensive and will have several features that make it so. The Bronze will be completely capable of carrying out the job and meeting all regulatory commitments.  Essentially the recommended Sewerage treatment plants will vary as will installation costs.

At Homeseptic we manage the process of choice, making your decisions as simple as possible. Our expert advisers will visit prospective customers to explain what is appropriate, legal, and suitable for you and the property’s ground conditions. This is at no additional cost or obligation to you.

We always recommend the best system for the task and your individual circumstances. We endeavor to also offer you a number of options covering the complete range of sewerage treatment plants. All types and cost variants will be explained giving you exactly what you need to make the right choice.

Please see our Choosing a tank guide

Why do I need a Sewage Treatment Plant?

In many cases, it is not feasible to connect properties to the main public sewer system. If this is the case then your property will have to have its own mini-drainage system. These work by collecting, separating, and processing the waste that leaves your property. The two most common domestic drainage systems are septic tanks and sewerage treatment plants.

A sewerage treatment plant is a packaged system that processes the waste from a property by a range of methods. Primarily aerobic digestion which results in separated and treated solids and liquids. The effluent emitted is essentially water, the quality will depend on your system. The liquids are safely discharged to the nearby environment via a nearby watercourse, ditch or underground soakaway. A soakaway simply collects and disperses the water which is then absorbed into the ground. 

Septic tanks are simpler systems, not having the capability to treat waste in the way a treatment plant does. The liquid from septic tanks is also discharged via a watercourse, ditch or soakaway.

This effluent discharged, however, is not safe for the environment. The tank does not treat the sewage. It is for this reason that there are the new 2020 sewerage regulationsThe main feature of this regulation is that you will no longer be able to discharge to a ditch or watercourse.  If you have an existing Septic Tank it will also affect your ability to sell your house. 

We can help you to meet these new regulations so call on 0800 3101092 or email us today.



How a Graf Sewage Treatment Tank works

At Homeseptic we love a Graf tank, while in some cases they are a little more expensive the customer service and quality is top notch. Graf tanks are batch cleaners, which means they process an amount of effluent with each cycle.

How does a Sewage Treatment Plant work? 

There are generally three main operations taking place within a domestic Sewage Treatment Plant. The number of stages and their exact function varies depending on the type and brand of domestic Sewage Treatment Plant. Please see our Sewage Treatment Plant buying guide for more details.

Settling and Separation

The settling chamber is the first stage in the purification process. In this stage in a similar way to a Septic Tank, the solids are separated using gravity. Gravity pulls the heavier solids and sludge to the bottom of the tank chamber. This removes the majority of the main pollutants. The leftover liquid less the heavier elements are then passed to the purification chamber. Some Sewage Treatment Plants combine this first stage and the purification in a single process using a sequence batch reactor.

Aeration/Purification phase

In the second phase, oxygen is injected into the tank stimulating bacteria growth and development, and promoting aerobic digestion. The oxygen is normally injected using a compressor within the Sewage Treatment Plant which is super efficient using little electricity. This is one of the reasons that a Sewage Treatment Plant normally requires an electric connection.

 Final Separation

Once the purification phase is completed, which is normally managed by an internal management system. The treated waste for most tanks then flows into a separate section where gravity again separates out any residual waste. This is not the case with Graf technology. The previous wastewater is now purified to appropriate environmental standards, see below. As we have mentioned the quality of the discharge is dependent on the tank you choose

 Please see the relevant governmental guidance:

Discharge to Surface Water

Discharge to the Ground

New Forest Philosophy

Homeseptic is based in the New Forest in between the cities of Southampton, Salisbury, and Bournemouth. We are a group of friends who grew up together in the area and grew tired of the way other Drainage firms are run. We want to actually put the customer first and turn up to do a good job we can be proud of. Unfortunately, this is not the case in the market, with most companies pressuring their workers to sell unnecessary works on a visit. We are honest hardworking professionals, which we hope you will agree with. A flash sales vehicle will not show up, with an even flasher salesman, and give you a load of chat. Then inevitably do a terrible job. We will come with the job in mind and give you the best value we can in order to facilitate a quality installation. 

We cover all of Hampshire, West Sussex, Dorset, Somerset, and Wiltshire. Please get in touch and see what you think.

Want to learn more?

We have a large collection of articles containing the answer to all of your questions. Check out our Blog Page 

Sewage Treatment Plant Installation/ installers
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Sewage Treatment Plant Installation/ installers
This guide offers a great starting point for anyone who is looking to buy a Sewage Treatment Plant.
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