Japanese knotweed (Fallopia japonica) is a highly invasive plant that has become a major problem in the UK for homeowners and purchasers seeking mortgages. Although the plant is reported to cause significant damage to buildings and external areas, the evidence to support this is limited in many cases. As a result, the government and environmental agencies have been working to update their advice on Japanese knotweed.
In this article, we will take a closer look at the updated advice and what it means for homeowners, buyers, and sellers.
What is the Updated Advice on Japanese Knotweed?
In 2021, the Royal Institution of Chartered Surveyors (RICS) updated their guidance on Japanese knotweed to provide more clarity for property professionals, including surveyors, lenders, and conveyancers. The new guidance acknowledges that not all Japanese knotweed infestations are equal, and provides a risk-based approach to managing the plant.
The new guidance moves away from the ‘seven metre rule’ previously used in assessing the risk of Japanese knotweed’s impact on a building, with focus on the area three metres from a property now recommended following recent research on the potential spread of the plant.
Under the updated guidance, the risk of Japanese knotweed is assessed based on the size of the infestation, and the potential for damage to the property. If the risk is deemed low, the knotweed may not need to be treated. If the risk is high, a management plan will need to be put in place to control and monitor the infestation.
What Does this Mean for Homeowners, Buyers, and Sellers?
For homeowners, the updated advice means that they may not necessarily need to treat Japanese knotweed if it is not posing a risk to their property. However, they should be aware of the potential risks and should monitor the plant regularly.
For buyers and sellers, the updated guidance means that the presence of Japanese knotweed is not necessarily a deal-breaker. The risk assessment will determine whether the knotweed needs to be treated or not. Sellers will need to disclose the presence of Japanese knotweed to potential buyers and provide evidence of a management plan if necessary.
What Should You Do if You Find Japanese Knotweed on Your Property?
If you find Japanese knotweed on your property, you should contact a professional for advice. They will be able to assess the risk and provide a management plan if necessary. It is important not to attempt to remove the plant yourself, as this can cause the infestation to spread.
The updated advice on Japanese knotweed provides a risk-based approach to managing the plant. Homeowners, buyers, and sellers should be aware of the potential risks and seek professional advice if Japanese knotweed is present on their property. With the right management plan in place, it is possible to control and monitor the infestation and minimize any potential damage.