Do you think you have Japanese Knotweed on your property or development site?


If you believe that you have found Japanese knotweed, we advise getting it identified as soon as possible. For a quick and easy identification, send us a photo of the suspected weed, along with your details and we will identify the image your provide. If it is believed that you have Japanese knotweed it is crucial that a site survey is organised straight away.

Japanese Knotweed Site Survey

Our Site Survey includes:

  • Site Location
  • Details of the client
  • A description of the site and surrounding area
  • A record of the plant location including a map
  • An outline of any development plans and past control work
  • A risk assessment as per the Royal Institute of Chartered Surveyors (RICS)
  • Recommendations


Japanese Knotweed Expert QuoteOur Site Surveys are charged starting at £312.00 and will be provided within 48 hours of the site visit. If the mortgage company also require evidence that the Japanese knotweed is being eradicated, we can create a Management Plan. This will outline how we would eradicate the invasive weed and how much this would cost. 

Before you agree to buy a house, lenders will require a Site Survey to be completed on the property to correctly identify any suspicious weeds and if they are a risk to the property. If you require written confirmation of what has been found on site, we are able to complete a full Site Assessment and Survey. This will include all relevant details about the Japanese knotweed that a Mortgage company need.

Japanese Knotweed Management Plan

Our Japanese Knotweed Management plans include detailed explanations of the different treatment methods that we can provide. They also state the most suitable treatment method for your individual case of Japanese Knotweed. This takes into account the site and clients preferences. Our Management Plans include:

  • The objective of control action
  • An evaluation of control options
  • A detailed control action description
  • Criteria for completion
  • Advice on preventing spread around/off/on site.
  • Any costs involved in the eradication of the invasive weed.


All of the Management plans we provide include a 10 Year Insurance Backed Guarantee and our 10 Year Company Guarantee. Our management plans are charged starting at £312.00.

Why would Japanese knotweed cause problems when purchasing a property with a mortgage?

You may find that it is difficult getting a mortgage with Japanese knotweed on the property. There is no set policy on whether or not lenders will provide financial support to clients looking to buy properties with Japanese knotweed, but generally, these clients are refused.

This is due to Japanese knotweed being highly invasive and having the potential to cause serious damage to drains, boundary/retaining walls, paths and driveways, patios and decking, flood defence structures, outbuildings, conservatories and gardens. Mortgage lenders may refuse a mortgage on a property where Japanese knotweed is within 7m (23 feet) of the property’s boundaries. 

Why would Japanese knotweed stop me developing on a site?

As mentioned above, Japanese knotweed is highly invasive and can grow up to 7 metres in one season. Even if the site has not been developed on yet, this puts any structures that are built on Japanese knotweed infested land at risk of structural damage. Any properties that are built on Japanese knotweed infested land are also at risk of severe depreciation.

To keep resulting costs to a minimum, development sites should be declared as free of Japanese knotweed before any development work commences. This reduces the risk to yourselves and to any future buyers of property on the site.