Japanese Knotweed and how it can affect your property

For homeowners, it’s important to think about potential threats that could cause damage to your property, such as flooding, rising damp, and infestations. One of the most damaging threats is a plant known as Japanese Knotweed.

The Japanese Knotweed is a plant species which is native to Eastern Asia. It was first introduced to the UK in the 19th century and it’s known to be an invasive and aggressive plant. As these plants can grow up to as much as 10cm per day, it causes damage to buildings, walls, drainage systems, and even flood defences which costs landlords, building developers, and local authorities significant amounts of money each year in terms of removal fees and project delays.

Before you buy a property, it’s recommended to speak to a RICS qualified surveyor who can carry out a homebuyer’s survey or a full structural survey report. By speaking to an expert who can undertake this for you, you will be able to get a clear understanding of the state and conditions of your property. Qualified surveyors will also be able to spot signs of plant infestations, including Japanese Knotweed. It’s important to know that it is a criminal offence for property sellers if they do not disclose Japanese Knotweed infestations. This further emphasises the importance of trying to identify and eliminate these types of infestations.

Scientists had recently conducted a study on managing this type of plant and they had found that it would be impossible for homeowners to manage with standard measures by themselves. The plant grows rapidly and can pose structural risks which makes it very difficult for homeowners. It’s estimated that even having Japanese Knotweed present can reduce the value of the property by as much as ten per cent.

If you’re currently experiencing an infestation, it’s important to be aware that only companies who specialise in removing this type of plant will be qualified to eradicate it once the plant has taken root. The costs for Japanese Knotweed removal can start from approximately £5,000 and it’s estimated that it could potentially cost the UK £1.5 billion to clear the country of Knotweed.

Published: 25 August 2021