UK's leading independent
Invasive Species advisor

Property Care Association’s only
approved independent surveyor

Ashfield Japanese Knotweed (AJK)  has extensive experience working with commercial and industrial property developers, high street banks, public authorities and industrial fund owners.

See a selection of our case studies below.

Commercial / Industrial Property Owner


 Sector: Commercial / Industrial

Key Services: Survey; Options Appraisal; Tendered Works, Resolved Dispute with Neighbouring Properties


  • Conducted a survey of the site and adjacent properties.
  • Undertook an Options Appraisal and Specification prior to Tendering the works. 
  • Liaised with neighbouring land owners on behalf of the client. 
  • Reviewed all tender returns, sought clarifications and recommended the preferred contractor to the client. 


  • Cost savings of £22,014 to the client. 
  • Resolved dispute with neighbour amicably and at little cost to the client.
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Residential Property in South Wales


Sector: Residential

Key Services: Survey; JK Management Plan; Tendered Works


  • Conducted a survey of the site and undertook a visual inspection of adjacent properties.
  • Advised on the correct JK Management Plan. 
  • Tendered works to three PCA approved contractors.


  • Correct JK Management Plan implemented.
  • Provided reassurance to homeowner on the required works.
  • Saving of £2,250 to the client based on costs provided by contractors.
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Public Authority Northern Ireland

JK Embankment Ek

Sector: Planning

Key Services: Survey; Options Appraisal; Management of Works; Regulatory Approval; Boundary Dispute; Contract Management


  • Provided advice on a planning application for development on a site which contained Japanese Knotweed.
  • Carried out full site survey and organised intrusive tracing to understand the extent of the issue.
  • Prepared an Options Appraisal to identify most suitable remediation techniques to enable development.
  • Created a Management Plan for submission to the NIEA and planning authority to satisfy planning conditions.


  • Integrated the Japanese Knotweed remediation solutions into the final site design.
  • AJK is currently in the tender review process for the works and the site is progressing through planning.
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Large Industrial Fund Owner

  • JK Onsite-735

  • Brynmenyn-plan-735

Sector: Commercial divestment

Key Services: Demolition Advice; Options Appraisal; Management of Works; Regulatory Approval; Boundary Dispute; Contract Management


  • Provided advice on the segregation and supervision required during demolition works.
  • Reviewed quotes obtained by the client to remediate Japanese Knotweed for £500,000.
  • Instructed a full invasive species survey which identified Japanese Knotweed, Himalayan Balsam and Horsetail both on site and along the boundary of an adjacent site. 


  • Options Appraisal identified a method of clearing the site for divestment at a cost of £100,000.
  • Saved the client £400,000.
  • Negotiations were initiated with adjacent land owner for the boundary infestations prior to the completion of land sale.
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Commercial Industrial Fund

Commercial Industrial

Sector: Securing Investment

Key Services:  Site Survey; Management Plan; Cost Risk Review


  • Carried out a survey of a large number of industrial sites as part of a due diligence exercise for the financial restructuring of a large industrial portfolio holder.
  • Made recommendations on the management of the Japanese Knotweed observed as part of the financial restructuring deal.


  • Client obtained funding without overly onerous management requirements associated with Japanese Knotweed.


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