- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 15 Sep 2014
Pre-purchase Japanese knotweed risk report
Japanese knotweed, a plant species that is not indigenous to the UK, is highly invasive and often causes extensive damage to property and to natural ecosystems. As a result, property values and lending decisions are often affected by its presence even if it is just in the near vicinity.
Non-native, invasive plant species are now regarded as one of the biggest threats to biodiversity worldwide, with the Centre for Environmental Studies estimating that £1.6 Billion is spent annually in the UK to remove Japanese knotweed.
 What damage does Japanese Knotweed cause?
- Damage to building foundations.
- Damage to housing drainage and underground sewers.
- Damage to tarmac and concrete areas.
- Damage to retraining walls.
The report utilises innovative remote sensing technology to highlight Japanese knotweed adjacent to, or on, commercial property sites. This allows commercial conveyancers, developers and surveyors to identify potential management costs as well as lending risks before purchasing properties.
A pre-purchase Japanese knotweed risk report might include:
- A location map.
- Indicative buffers showing the potential coverage of root systems.
- Unique remote sensing technique returns data.
- A site boundary polygon with 250m radius buffer.
- Polygon areas for knotweed stands greater than 5m2.
Additional expert advice may then be necessary:
- Follow up plant verification service.
- Guidance about Japanese knotweed treatment options, tailored to available time scales and budgets.
This article was created by --User:.MAPbyGroundsure
 Find out more
 Related articles on Designing Buildings Wiki
Featured articles and news
The seismic strengthening of historic churches.
Results show guarded optimism and payment concerns.
Noteworthy navigable aqueducts.
Technology is making remote work a reality.
Carefully placed structures add drama to pastoral vistas.
Report provides actions required by 2030 to achieve a zero carbon economy.
What type of cool roof is most suitable?
Active Travel programme prioritises cyclists and pedestrians.
CIAT issues caution for use of new standard.
Industry leaders discuss climate change, the economy and other influences.
The building manager is key to operations.
The impact Scotland’s dynamic coast has on the historic environment.