
Bristol records highest density of Japanese knotweed in England – Environet
The city reported 32.29 incidences per square mile, more than twice the density seen in Merseyside at 13.45.

The city reported 32.29 incidences per square mile, more than twice the density seen in Merseyside at 13.45.

Nic Seal, founder of Environet, said: “It’s been incredible to see Environet lead the growth in the industry over the past 30 years."

The study showed 7% of homes were hit by knotweed, lowering average values by about 5%, or £13,500 per property.

Environet said that while AI can help as a guide, relying on it alone is risky for property transactions where accuracy is needed.

According to data from Environet, Merseyside followed with 11.87 cases per square mile, then Greater London at 7.74, and Lancashire at 7.25.

Andrew McColl said: “This report offers a reliable way to flag potential issues early on, benefiting surveyors, conveyancers, estate agents, and the public.”

Long-awaited new RICS Guidance Note for Japanese Knotweed scraps 7 metre rule and gives surveyors more leeway to use judgement.

The blight of Japanese knotweed has wiped an estimated £11.8bn off the current value of the UK housing market,
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