Commercial Removal


Japanese Knotweed Removal on Building Sites

Japanese Knotweed removal is a pressing problem in the land development sector. Top of the list of the UK’s most invasive plant species, Japanese Knotweed causes untold damage to buildings and utility infrastructure. For landowners, property developers and building contractors, if it is present on a construction site it may result in costly delays to project timescales.

As a destructive and aggressive plant, Japanese Knotweed is highly regulated. The Infrastructure Act 2015 empowers local authorities to seek a Species Control Agreement (SCA) with landowners. If this is breached, then a Species Control Order (SCO) may be imposed. Getting rid of Japanese Knotweed quickly, aside from any legislation, is imperative.

Japanese Knotweed Experts

The Knotweed Experts has an outstanding track record of Japanese Knotweed removal on development sites, where speed is of the essence. Our offices are located across England, including London and Birmingham, and in Cardiff. We are proud to have worked with prestigious clients such as Taylor Wimpey, Persimmon, Babcock and Amey, demonstrating our expertise with large-scale projects. Our company features on the commercial pages of specialist websites for property developers, housing associations, the public sector, railways and utilities, as well as the construction sector. We have developed a unique scheduling app which enables live minute-by-minute reporting for your convenience.

We are:

• Members of the Property Care Association (PCA) invasive weed control group
• Achilles Building Confidence accredited
• Constructionline accredited
• SafeContractor approved

Getting Rid of Japanese Knotweed Quickly

There are a number of tried and tested methods of Japanese Knotweed removal, but unfortunately, some of these take a long time to achieve. For example, with herbicides it takes at least three years to guarantee eradication. This is not a viable option for land developers and building contractors with a deadline, when overrunning can incur hefty fines. Japanese Knotweed excavation is the only practical option on development sites.

Japanese Knotweed Excavation

Using top of the range plant machinery, we will excavate contaminated areas to remove all traces of Japanese Knotweed. The depth of excavation is usually around 1.8 m but may be even deeper. Since underground shoots can extend up to 7m from a single plant, the area of excavation will be more substantial than surface growth indicates.

As for disposal, there are two main options—on-site burial and off-site removal.

On-site burial must be at least 5m deep, which is not always feasible. We sometimes use 2m-deep burial, making sure we enclose the material in a specialist Japanese Knotweed root barrier to control further spread.

For off-site disposal, we sift and screen the contaminated soil, either manually or mechanically, to separate the Japanese Knotweed rhizomes. We take these to landfill sites for disposal.  The remaining infection-free soil can be used elsewhere on the development site. This has proved to be a sustainable, cost-effective solution.

We cover all types of sites; we have worked for property management companies, construction companies, facility management companies, property consultants, estate agents, civil contractors and many more.  Aside from excavation, we can offer herbicide spraying as well as all our other services for commercial clients.

Find out more about our process.


Our experts answer your questions from Monday to Friday 8:30 am – 5:30 pm at 0800 122 3310. Alternatively, fill in our contact form to request a callback within 1 working day.

Call a Knotweed Expert Now!
0800 122 33 10
Book your survey today


Building Confidence
Trust Mark