- 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
Assembling, curating, caring for, and designing the future.
A sensitive approach to renovating a building of historic stature.
UK energy policy uncertainty as Welsh project put on hold
What collaborative working achieves and how it can be put in place.
BSRIA publishes the 2019 edition of its small but concise annual databook.
Using QSAND to measure the performance of disaster response.
What U-values are, why they matter and how they are calculated.
The need to ensure that we plan for all aspects of our bio-economy
BSRIA calls on government to reach deeper into the causes of pollution.
George Demetri brings a whole new level of technical knowledge to Designing Buildings Wiki.
Quality professionals need to take an active role in driving the completion process forwards.
The innovations needed to move from rhetoric to realisation.