Japanese Knotweed Survey

Japanese Knotweed Survey

Japanese knotweed is an invasive and resilient weed. Its roots and rhizomes can grow to a depth of 2m. A property is considered to be “affected” by knotweed if it is found within the boundaries of the property or close to the boundary on an adjacent property. To help understand and categorise the level of risk that the knotweed presents to the property, the Royal Institution of Chartered Surveyors (RICS) have created a “risk” table (see table below). The area around the visible knotweed will contain underground rhizomes and this area is indicated on our survey drawing and referred to as the “risk zone”.

If you are selling or buying a property that is affected by Japanese knotweed it would be prudent to obtain a Japanese knotweed survey to obtain a Japanese knotweed report. A survey will provide a formal Japanese knotweed identification and an accurate record of where the knotweed is located and the true extent of the contaminated area.

Survey Costs

Once you proceed with your Knotweed Management Plan (KMP), the cost of the survey will contribute to the overall cost of your KMP. Find out out more about our KMP here.
NB: If the property is in the Highlands of Scotland, Isle of Anglesey, Gwynedd, or the Isle Of Wight we charge a further £100 +VAT

Survey Only: £150 +VAT.

Survey and Initial Herbicide Treatment: £250 +VAT

Example of a Plan of Japanese Knotweed Contaminated Areas from a Knotweed Survey

Knotweed Survey

Knotweed Plan Proposal

A professional Japanese knotweed identification, detailed account of our findings, photographs, location plan and confirmation on the knotweeds RICS property risk category will all be included in a Knotweed Management Plan (KMP) proposal.

Any visible signs of damage caused by the knotweed to the buildings, ancillary structures or hard standing/paving will be noted. The survey/KMP will quantify the extent of the problem and may also identify knotweed in neighbouring gardens. It will enable you to establish the true and realistic cost of the remedial works.

This applies for all mainland counties in England, Scotland and Wales.

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.

Knotweed Survey

  • Ideal for home sellers & buyers/mortgage lenders of knotweed affected property
  • The Japanese Knotweed survey report includes the Royal Institute of Chartered Surveyor’s (RICS) property risk category
  • Includes an accurate drawing using an Ordnance Survey map
  • Required for the Insurance Backed Guarantee
  • Japanese Knotweed Ltd are members of the Property Care Association Invasive Weed Control Group (PCAIWCG)

Survey Scope

  • Location of the infestation
  • Extent of the affected area
  • RICS risk category
  • Damage to property
  • Damage to drains and services
  • Damage to patios, paths and driveways
  • Knotweed in adjacent land/property
  • Proximity of knotweed to a watercourse

Other Considerations

  • New extensions and outbuildings
  • Landscaping works
  • Gardening
  • Encroachment onto other properties
  • ASBO
 
 

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