Commercial Japanese Knotweed Survey

Commercial Japanese Knotweed Survey

Japanese knotweed a non-native invasive plant species governed by legislation and a risk to property. A site is considered to be “affected” by knotweed if it is found within the boundaries of the site or close to the boundary on an adjacent property/land.

In purchasing property/land you should make yourself aware to the presence of Japanese knotweed on or off site. It can have an impact on land price and a property owner has a duty of care to ensure that knotweed does not spread beyond the boundary of the site.

If land possessing Japanese knotweed is to be disturbed by development works the survey is further required to enable all feasible knotweed remediation methods to be ascertained and priced.

There are a variety of different methods of treating and eradicating Japanese knotweed from herbicide treatment to excavation. A survey will help determine the best method based on the extent of the infestation, proposals for the site, timescales and available space for any on-site sustainable remediation methods. It is for this reason that early identification is crucial to minimize remediation costs.

The Knotweed Management Plan (KMP)

Japanese knotweed site plan, site survey

When we carry out a survey we will prepare you a Knotweed Management Plan (KMP), which will include the survey, risk level, any proposed change of land use and proposal for remediation of the problem.

The KMP is a working document. When remedial works are undertaken the records of these works is recorded within the KMP, including any guarantee details and certificate where this is to be provided.

Royal Institute of Chartered Surveyors (RICS) RISK category table

Category Descriptors - Japanese knotweed risk categories (4 being the highest risk)

4

Japanese knotweed is within 7 metres of a habitable space, conservatory and/or garage, either within the boundaries of this property or in a neighbouring property or space;

and/or

Japanese knotweed is causing serious damage to outbuildings, associated structures, drains, paths, boundary walls and fences and so on.

Further investigations by an appropriately qualified and/or experienced person are required (Japanese Knotweed Limited)

3

Although Japanese knotweed is present within the boundaries of the property, it is more than 7 metres from a habitable space, conservatory, and/or garage. If there is damage to outbuildings, associated structures, paths and boundary walls and fences, it is minor. Further investigations by an appropriately qualified and/or experienced person are required (Japanese Knotweed Limited)

Further investigations by an appropriately qualified and/or experienced person are required (Japanese Knotweed Limited)

2

Japanese knotweed was not seen within the boundaries of this property, but it was seen on a neighbouring property or land. Here, it was within 7 metres of the boundary, but more than 7 metres away from habitable spaces, conservatory and/or garage of the subject property.

1

Japanese knotweed was not seen on this property, but it can be seen on a neighbouring property or land where it was more than 7 metres away from the boundary.

 

 
 
 
 

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