The short answer is yes.
Any knotweed within 7m of your house is an issue. If you are a homeowner, I have been informed it could take 10% off your house price. It turns out that could be a conservative estimate. In this article this homeowner was looking at a 50% discount on his house price plus he has the headache of trying to sue Network Rail.
But it doesn't stop there. You could be liable if the weed spreads to neighbouring property and recent case law suggests you could be liable for the loss in value of those properties. Not an insignificant risk.
This reminds me of past issues of rising damp, next it was subsidence. Both those issues are treatable and no longer a huge threat. Let’s hope knotweed goes the same way.
Until then, consider taking out insurance cover which you can get for £50
When the Victorians introduced Japanese knotweed to Britain thinking it would be a pretty addition to the herbaceous border, they could not have predicted the damage its rapid, uncontrolled spread would eventually cause.