Why Knotweed Neighbour Disputes Are Rising — and How to Handle Them

Conversations with property solicitors across southern England suggest a steady rise in private nuisance claims involving knotweed encroachment. The legal principle is now well established — a landowner who allows knotweed to spread onto neighbouring property can be liable — but the practical reality is that most disputes are far better resolved before they reach a courtroom.

The most common dispute pattern

Disputes typically begin when one neighbour discovers a stand on a shared boundary and asks the other to deal with it. Tensions escalate when the responsible party either denies the problem, attempts a clumsy DIY removal, or treats only their own side. A unilateral approach often pushes the rhizome system in the opposite direction, deepening the damage and the resentment.

How to keep things constructive

The most successful resolutions we have seen on the Isle of Wight involve both neighbours commissioning a single specialist to assess the entire affected area, agreeing a joint treatment plan, and sharing the cost in proportion to the affected ground. A written agreement avoids future disputes about who paid what and protects both parties when either property is sold.

When legal action becomes unavoidable

If a neighbour refuses to engage at all, a formal letter from a solicitor referencing the relevant case law often produces movement without litigation. Courts have shown a clear willingness to order treatment costs and, in some cases, damages for diminution in property value. Documentation from a recognised specialist will be central to any claim, which is another reason to involve a professional from the outset.