Treatment & Removal Methods - TP Knotweed Solutions

Commercial knotweed removal

We serve a wide range of industries with our commercial knotweed removal services. Our professional services are used by construction companies, retail outlets, industrial units, local authorities, property managers and more, meaning that whoever you are, we will have worked with someone in your business area before. We operate quickly and efficiently in order to secure your premises against further knotweed growth and begin the process of elimination.

Our commitment to care extends beyond your immediate commercial knotweed removal. As fully certified Japanese knotweed removal experts, you can be assured of receiving the highest quality service, guaranteeing permanent commercial knotweed removal for up to 10 years. See our accreditations page for a full list of our certifications.


Precise site mapping

To ensure the highest possible level of accuracy we provide our clients with a site specific CAD plan detailing the exact location of the Japanese knotweed. This precise mapping is based on GPS coordinates taken by our surveyors whilst on site. Using CAD plans we are able to target the Japanese knotweed and tailor treatment or removal plans to suit your specific site. TP Knotweed Solutions have invested in the latest software to meet construction industry standards and enable developers to fully rely on the work carried out by us.


We have five removal options and which one you use will be dependant on the scale and spread of your Japanese knotweed. Click on the method below to find out more.


A good example of this type of removal is when the discovery of Japanese knotweed halts property developments. It can also be a planning condition that the knotweed is excavated and removed off-site.

Developers rarely have the time available to carry out a 5 Year herbicide treatment programme and these herbicide plans are also not suitable if you have plans to excavate soil and develop. In this case, immediate knotweed removal via physical excavation and licensed disposal of the controlled waste is the best option.

TP Knotweed use our experienced clerk of works to chase the knotweed roots down rather than excavating indiscriminately. This minimises the amount of clean soil removed from the site, and means that our excavation service is one of the most competitively priced on the market. We have effective measures in place to ensure all Duty of Care requirements are met under the Environmental Protection Act (EPA) 1990. All machinery is inspected and cleaned after use, to prevent further spread of this highly invasive plant.

Clients are provided with Waste Transfer Notes for their records.


Where the space is available on a development site, contaminated soil containing Japanese Knotweed can be excavated from the affected area of the site and relocated to a different area of the site and stockpiled. Here, it can be treated on-site using herbicide treatments over a period of 5 years to kill the Japanese knotweed.

This will enable the client to develop the previously affected area of the site immediately and will also reduce the overall costs as no Japanese knotweed soil (Classed as Controlled Waste) would need to be taken off site.

The client would need to have a large site for this removal method and should contact TP Knotweed Solutions early on during the development so that we can advise further.


This method can be very effective but depends on the soil type, weather conditions and the space available on the development site. If feasible, it can reduce costs by over 50% compared with complete excavation and off site disposal to landfill.

Soil screening involves the excavation and removal of Japanese knotweed material from the ground. A selection of different sized metal screens and conveyors are then used to separate the knotweed rhizome (Root material) from the soil. A handpicking station is then be used to manually remove any remaining bits of rhizome from the soil.

The Japanese knotweed rhizome can then be placed in to sealed bags and taken off-site to be incinerated. The screened soil can then be placed in to a separate area of the site and used for landscaping or alternatively as a subsoil layer, which is capped off. It is also important that a monitoring programme is implemented to ensure that any missed Japanese knotweed rhizome is quickly spotted and treated effectively.

The screening process means that the amount of material taken off site is significantly reduced, resulting in lower costs for the client. There will still be some soil that needs to be taken to a licensed landfill, however the quantities will be much lower.

This method is suitable for sites that do not have time for long-term herbicide treatments or they are not suitable due to planned development. Specialist machinery is used, tailored and specifically designed for the processing the soil into 3 fractions.


If your site has the space available we are able excavate the Japanese knotweed with the infested soil and encapsulate it within a heat welded geo-textile membrane.

A large burial pit is created (up to five metres deep) and the burial pit is lined with a geo-textile membrane.

The clean soil is temporarily stockpiled while the Japanese knotweed is placed into the burial pit. The seams of the geo-textile membrane are heat welded to create a fully sealed “cell” and then a minimum of two metres of the clean soil is placed on top of the cell.

▪ A relatively quick treatment method.
▪ Normally suitable below proposed car parks.
▪ Monitored carefully to ensure that there is no future knotweed growth.
▪ More cost effective and environmentally friendly than ”Dig and Dump”.

▪ Due to the extensive ground works, this method can be more expensive than others.
▪ Water table levels, the size of the site and the type of development need to be considered.
▪ We do not recommend locating a burial cell below a building or structure due to future issues with subsidence.


Root barriers are an effective knotweed control method consisting of a geo-textile membrane that prevents the rhizome network (roots) of the plant from spreading. They can be used to protect neighbouring properties from infestation, or the drains and foundations of your own property from damage.

Alternatively, root barriers can be installed to prevent knotweed on adjacent properties from infesting your land. Once installed, a root barrier should remain effective for approximately fifty years, although certain conditions such as prolonged exposure to sunlight or very acidic soil may reduce the lifespan. Root barriers are available in both permeable and non-permeable forms.

It is important to understand that knotweed control measures such as root barriers only contain the problem, they do not eradicate the infestation. We therefore recommend their application in conjunction with eradication methods such as herbicide treatments or excavation.



Timescale: 3-5 Growing Seasons

We offer the complete herbicide treatment to eradicate Japanese knotweed and will tailor our treatment to your home or land. This is the most cost-effective treatment available.

▪ We hold all relevant NPTC Certificates – PA1, PA6, AW
▪ We are experienced at treating Japanese knotweed in areas close to water, which involves liaising with the Environment Agency and other relevant authorities, working in line with the ‘Knotweed Code of Practice’ and the ‘Code of Practice For Using Plant Protection Products’.


Timescale: 3-5 Growing Seasons

We have developed a stem injection system that offers excellent results when you are looking to eradicate smaller concentrations of knotweed around your home or garden.

▪ Cost-effective solution
▪ This treatment can go ahead regardless of the weather
▪ Environmentally friendly with no negative effects on nearby plants or wildlife
▪ If a Tree Preservation Order is in place, stem injection is safe to use
▪ Ideal for use near water or on sensitive sites

Ready to get a bespoke quote?



TP Knotweed Solutions Ltd
Unit 3, The Spinney
Alkerton Oaks Business Park
Upton Estate, Stratford Road
Banbury, OX15 6EP


International House
124 Cromwell Road
Kensington, London
Tel: 020 3540 6135


Hill Quays
14 Commercial Street
M15 4PZ
Tel: 0161 250 5005


Our Swansea office is opening soon. You can still enquire about our services in your area by calling the number below:
Tel: 0800 389 1911