Depending on the distance between the Japanese knotweed and your house, you may find that an infestation in your neighbour’s garden can have a negative effect on your house value. Property surveyors can often downplay or over-estimate this devaluing effect, so it can be difficult to understand where you stand. The amount of money that you stand to lose from being next door to a knotweed infestation depends on the severity of the infestation and how close it is to encroaching on your land. Obviously, if it is identified on a survey then extra care should be taken and you should always request a survey from the Japanese Knotweed Agency.
