Japanese knotweed bush with green shovel shaped leaves and red stems


A management plan is created once a survey has identified Japanese knotweed is on your site. This plan covers the scheduled treatments or excavation works and related costs, and is essential when buying or selling a property. We offer an insurance on our company guarantees that is widely accepted by major UK mortgages lenders in the industry.


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why is a plan necessary?

The Environment Agency states that once you find Japanese knotweed on private land or commercial development site, it is essential that you set up some form of Knotweed Management Plan (KMP).

It’s the survey findings that will go on to form a documented KMP for the property. This includes an assessment of the extent of the infestation, and severity of impact to the current or proposed future use of the property or land, which can include restrictions on maintenance and amenity use activities, and in rare cases material damage to structures.

What’s included?

The KMP provides you with the survey report, picture evidence of Japanese knotweed (or other invasive weeds) found onsite, a site drawing locating the knotweed and our recommended plan of action for remediation –  herbicide programme or excavation and removal.

The quotation within the plan may include several methods depending on the site. If there are known change of land use proposals for the property, these will also be evaluated to decide the appropriate control method. After the works have been carried out you will receive a Completion Report as evidence of works undertaken.

Close up of Japanese knotweed stem showing detailed patterning

when we may need to leave knotweed on site

Should we use any method where the knotweed remains onsite (such as Dig & Cap or Dig & Burial) we record the location, dimension and depth of the burial in our Completion Report. It is important that the KMP is kept as a permanent record of where any knotweed was relocated to so that this can be provided to future purchasers. On developed sites this document should be included in the Operational and Maintenance Manuals.

Each KMP is specifically written to cater for the requirements of the customer and site.

excavators working in a rural site to clear contaminated ground of Japanese knotweed

insurance backed guarantee

When quoting your remedial works, we will include an insurance policy or provide you with a quotation for a Insurance Backed Guarantee which can provide insurance cover for a period of up to ten years and only a one-off premium payment is required. The quotation will confirm the premium applicable. This is a low cost, long term insurance policy, which provides valuable protection for consumers when undertaking home improvements projects. It provides you with additional peace of mind that in the unlikely event the company ceases to trade, for whatever reason, you can still make a claim under the terms of the original guarantee.

If you discover that the original contractor has ceased to trade you would make a claim to the insurance underwriters. They would organise a re-inspection of the property by an alternative PCA member contractor. If the re-inspection report confirms regrowth of Japanese knotweed*, The underwriters will meet the reasonable costs of any re-treatment works required.

*in the area(s) originally treated, and detailed within your management plan, and covered by the original contractor’s written guarantee.

Two business partners signing agreement documentations after negotiations.

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