Our affiliations and accreditations


PCA (Property Care Association)

Japanese Knotweed Ltd are members of the Property Care Association (PCA) Invasive Weed Group. This provides consumers with a means of identifying specialist contractors and consultants who can undertake invasive weed control services which can help control and eradicate Japanese knotweed and other invasive plant species. Accreditation to this scheme demonstrates our professionalism in the industry of invasive weed management, treatment and removal.

Trust Mark

Trust Mark

TrustMark is the only Government endorsed scheme for trades in and around the home. They award registered firms with their accreditation after thorough vetting and on-site inspections to ensure the firm is raising industry standards. This accreditation gives customers reassurance of quality and protection from rogue traders. TrustMark is the only ‘find a tradesperson’ scheme to cover all 3 cornerstones of quality:

  • Good trading practices
  • Good customer service
  • Technical competence

CHAS (The Contractors Health and Safety Assessment Scheme)

Japanese Knotweed Ltd are registered contractors to the CHAS Government backed and SIPP Health and Safety scheme. Each month thousands of contractors and consultants (suppliers) apply for work with public and private sector organisations (buyers). To win work, they must meet the buyer’s health and safety standards.

Assessing suppliers health and safety competence is usually a lengthy and time consuming process. Suppliers can sometimes meet one buyer’s Health and Safety standards but not another. Being CHAS approved reduces duplication as suppliers compliance is accepted by all CHAS buyers.

CHAS assesses applicants:

  • Health and safety policy statement
  • Their organisation for health and safety
  • Their specific health and safety arrangements to a standard acceptable to our buyers and to others

Accreditation to this scheme demonstrates our proficiency to Public, Company, Employer and Employee Health and Safety.

Safe Contractor


Japanese Knotweed Ltd are registered contractors to the SafeContractor, SSIP (Safety Schemes in Procurement) Health and Safety scheme. The SafeContractor scheme provides a health and safety audit service for contractors who want to reassure their clients that health and safety is being handled correctly and sufficiently on their sites.

Accreditation to this scheme demonstrates our proficiency to Public, Company, Employer and Employee Health and Safety.

Builders Profile

Builder's Profile

Japanese Knotweed Ltd is registered and approved suppliers on the Builder's Profile Supply Chain Management Assessment Scheme used by companies such as Balfour Beatty and Wates Group.

Builder's Profile is the open-access Common Database service providing compliance and PQQ (pre-qualification questionnaire) information to the construction industry. Our secure Common Database enables subcontractors and suppliers to easily maintain and share information. For main contractors and clients it provides all the information, documents and tools required to manage a supply chain no matter how large or small.


RISQS (Railway Industry Supplier Qualification Scheme)

RISQS, formerly known as Achilles Link-up, has been developed to provide a service for the qualification of suppliers for all products and services that are procured by the industry. RISQS supports Network Rail, LUL/Transport for London, passenger, light rail and freight train operators, rolling stock organisations, main infrastructure contractors and other rail products and services providers in the management of supply chain risk. RISQS is an independent, third party qualification assessment of a supplier’s capability to supply products and services.



ConstructionLine collect, verify and monitor standard company information aligned to PAS 91:2013, the standardised PQQ (pre-qualification questionnaire) developed by BSI to reduce duplication within the construction industry.



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