Body plans knotweed risk guidance
There have even been "rare and exceptional" reports of the weed causing more dramatic harm by ripping through foundations and pushing its way up inside the home.
But RICS, which has opened a consultation on the issue, said concerns are often based on "misunderstanding and overreactions".
Sales have fallen through due to lenders turning down loans on properties blighted by Japanese knotweed, the professional body said.
But it added that while the plant is hard to control, with the right treatment "it needn't be a life sentence for a property".
The organisation suggested that the problem can be assimilated into the lending process in the same way that challenges such as building movement and asbestos have been dealt with.
RICS spokesman Philip Santo said: "When assessing market value, valuers must take account of a variety of factors and the presence and effects of Japanese knotweed is just one of the many considerations that may affect value.
"While this invasive, non-native plant can be difficult to control it should be recognised that timely and persistent treatment programmes can minimalise its impact."
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