TEL: 01327 703129
(Head Office)

TEL : 01962 886060
(Southern Regional Office)


Developers and Commercial Premises

The Knotweed Company offers a full range of services geared to construction sites and commercial premises. We have had experience of working on construction sites since 2004 and tailor our works to our client’s requirements and needs.


The Knotweed Company is one of the most experienced and competent contractors working with Japanese knotweed and other invasive weeds. Our professional team began working exclusively with Japanese knotweed (as well as other invasive plants) in 2004 and since then has successfully completed a vast number of excavations, herbicide programmes, cell burials, bunds, root barrier installations and a variety of combined solutions. We have experience of both small and large projects and operate throughout England and Wales, as well as the Channel Islands (and elsewhere if requested). Health and Safety is a key factor in our work. We operate to the highest standards and are always looking to improve.

Our operational staff hold appropriate qualifications, such as SSSTS or SMSTS, as well as CSCS cards. All operational staff hold the appropriate certificates to apply herbicides (NPTC PA1, PA6AW as a minimum) as well as holding the appropriate qualifications for Japanese knotweed, such as the PCA’s CSJK (Certificated Surveyor in Japanese knotweed) or the QTJK (Qualified Technician in Japanese knotweed). We are active contributors to the PCA Invasive Weeds Control Group and have greatly influenced both the creation and running of the examination systems for both knotweed Surveyors and Technicians.

As well as being a full contracting member of the PCA, we are accredited with Constructionline (Gold), CHAS, Safecontractor and Builders Profile.

The Knotweed Company were awarded the PCA Project of the Year in 2018 for innovative thinking that enabled an important construction project to proceed despite a substantial Japanese knotweed presence and a history of previous site disturbance. Click here for the case study.


We cover all of England and Wales, as well as the Channel Islands, and can offer:

  • Knotweed Management Plans
  • Invasive weed surveys
  • Free quotations
  • Consultancy services
  • Watching brief
  • Full excavation and muckaway contract works
  • Cell burials
  • Bund/Stockpile creations
  • Root barrier installations
  • Screening works
  • Herbicide treatment programmes
  • Extended and Insurance-Backed Guarantees

Our clients include:

Client Logo Allenbuild Client Logo London Borough of Hounslow Client Logo London Borough of Richmond Client Logo National Trust Client Logo NHS Client Logo St.Mungo's Client Logo Wesleyan Client Logo Blafour Beatty Client Logo Greater London Demolition Client Logo Kier Client Logo Morris Client Logo Taylor Wimpey Client Logo The Church of England Client Logo HML Andertons Client Logo Kettering Borough Council Client Logo Bowmer Kirkland Client Logo CWC Group Client Logo Guernsey Housing Association Client Logo Riney Client Logo Fortem Client Logo PYE Homes Client Logo Rihoy and Son Client Logo Ground Union Housing Group Client Logo Luton Client Logo R G Falla Client Logo Cambridgeshire County Council Client Logo Allenbuild Client Logo London Borough of Hounslow Client Logo London Borough of Richmond Client Logo National Trust


Site development
Root Barrier Installed

Our many previous clients include Allenbuild, Balfour Beatty, Bellcross Homes, Bowmer and Kirkland Ltd, Cambridge County Council, CWC Group, Fortem Solutions, Grand Union Housing Group, Greater London Demolition, Guernsey Housing Association, JB Riney & Co Ltd, JSL (Trevenson), JW Rihoy & Son Ltd, Kier, Lodge Park, Luton Borough Council, Morris Homes, Newland Construction, Pye Homes, RG Falla and Taylor-Wimpey.

For more case studies please click here.

Accreditation Property Care Association Accreditation Trustmark Accreditation CHAS Accreditation Constructionline Acclaim Accreditation Amenity Forum Accreditation Amenity Standard Accreditation Alcumus Safe Contractor Accreditation Builders Profile Accreditation FSB

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