Why You Need a Japanese Knotweed Management Plan (and a Guarantee to Match!)

If you're buying or selling a property with Japanese Knotweed, a Knotweed Management Plan isn’t just a good idea—it’s essential. Most mortgage lenders won’t even consider approving a loan without one, especially if the knotweed is within the property boundary. In some cases, even knotweed on a neighbouring property can raise red flags.

So, what exactly is a management plan? It’s a structured treatment programme carried out by a qualified contractor—usually a member of the Property Care Association (PCA). These plans often span 5, 7, 10, or even 15 years, depending on how severe the infestation is.

But here’s the important part: most lenders will only accept a plan if it comes with a 10-year insurance-backed guarantee. This gives buyers peace of mind—and gives lenders the reassurance that the problem is being professionally managed.

The cost? It can range from a few hundred to several thousand pounds, depending on the level of treatment needed and how widespread the knotweed is. It’s a serious investment—but one that protects your property value and keeps the sale (or purchase) moving forward.

Always work with a PCA-registered company to ensure the plan meets lender requirements and is backed by a proper guarantee.