Japanese Knotweed Problems


What are the problems caused by Japanese Knotweed?

Japanese Knotweed can interfere with drainage pipes and other structures, blocking and sometimes lifting the pipework and clogging sumps, Other underground infrastructures are at risk, such as cabling and water pipes. Along with other features such as damp and structural defects, surveyors will take the risk of damage from Japanese knotweed rhizome into account in their assessment of a property.

This is based on criteria advised by the Royal Institution of Chartered Surveyors. Where Japanese knotweed is considered to pose a risk to the property, it is usually necessary to undertake to eradicate the plant by implementing a Japanese knotweed management plan. In order to meet the requirements of the mortgage lender the plan and its execution need to be undertaken by a member of a recognised trade association such as the Property Care Association, OUR STAFF AT JKS ARE PCA TRAINED.

The mortgage lenders recognise the standards and professionalism of such a trade association along with the assurance that comes with their work. Typically, a plan will be produced for your approval with costs provided. This will then be carried out, usually by applying herbicide once or twice in the first year and then once each following year until the plant no longer reappears. The property will be monitored for regrowth for the following two years and if still no regrowth, the property will be declared free of Japanese Knotweed Problems.

Were it to reappear, the herbicide treatment would resume and so on. In some cases, lenders have simply rejected applications for a mortgage, unprepared to accept a Japanese Knotweed management plan. The herbicide used is most likely to be Glyphosate and the application can only be undertaken by an appropriately certificated operative. Glyphosate has a remarkably low toxicity to humans and other animals and it becomes inactivated, effectively harmless, on contact.

Contact us for more information on 01782 243158

 Knotweed and the law