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 Development – Norfolk

Sector: Commercial Development

Key Services: Survey, Tender Exercise & Project Management


  • Undertook a survey of the site for the extent of Japanese knotweed.
  • Reviewed existing geo-environmental reporting and identified the risk of Naturally Occurring Radioactive Material (NORM).
  • Submitted a Japanese Knotweed Management Plan to discharge planning conditions.
  • Procured and supervised contractor in the excavation of knotweed & coincidental NORM.


  • Works undertaken on time and within budget.
  • Works approved by both the Local Planning Authority and Radiological Protection Supervisor
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Housing Development – Wrexham

Sector: Housing

Key Services: Survey & Contract Management


  • Conducted a survey of the site for invasive species.
  • Prepared alternative strategies to those presented by a specialist contractor.
  • Tendered the client’s preferred strategy to six specialist contractors.
  • Successfully negotiated planning approval of preferred strategy.


  • Saving of over £100k to the Client.
  • Works undertaken on programme and within budget.
  • Local planning authority approval.
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Site Acquisition – Bristol

Sector: Commercial Key Services: Survey & Risk Overview Report Actions:
  • Conducted a survey of the site for invasive species.
  • Identified additional risks to managing the identified Japanese Knotweed i.e. land contamination.
  • Reviewed Client’s aspirations for the site if purchased from the vendor.
  • Provided a fully costed Risk Overview Report on the site for managing the Japanese Knotweed identified.
  • Client understood the required works to manage the Japanese Knotweed prior to purchasing the site.
  • Client understood the commercial risk (£200k – £300k) prior to agreeing the purchase price for the site.
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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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