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Japanese Knotweed Survey

If you suspect that Japanese knotweed is present on your site, or you have been asked for a survey already, Arbtech can carry out a Japanese knotweed survey using our expert knowledge and years of experience.

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Arbtech are the best asset you can possibly have when you need ecology or tree surveys to help you obtain planning permission.

Everything You Need to Know About Japanese Knotweed Surveys

There’s lots of things you may want to know if you suspect you have Japanese knotweed on your site. You’ll find everything you’re ever likely to want to know about your Japanese knotweed survey here, but if you still have questions just give our experts a call!

Japanese Knotweed Background

Japanese knotweed is listed in Schedule 9 of the Wildlife and Countryside Act 1981. It is an offence to plant Japanese knotweed or cause it to grow in the wild. Any action that causes Japanese knotweed to spread is an offence which includes dumping contaminated material. If a homeowner allowed Japanese knotweed to spread from their land, this could also be an offence although currently, this has not been tested in court.

Japanese knotweed is also listed as controlled waste under the Environmental Protection Act so it can only be disposed of at licenced landfill sites.

Japanese knotweed was brought over to Europe, from Japan by a botanist named Phillipp von Siebold. At first, the plant was praised for its beauty and potential for use as animal feed. Eventually, it made it’s way into the Royal Botanical Gardens in Edinburgh and began to be sold commercially.

As the plant started to make its way across the UK, it eventually got out of control by spreading, undetected via waterways and the movement of contaminated soil that was used for construction.

Why Japanese Knotweed Causes Problems

Japanese knotweed causes problems because it spreads so quickly and it is very difficult to get rid of. It is a robust plant, capable of growing in difficult conditions on the sides of Japanese volcanos, so in the comparatively welcoming climate of the UK, it can grow far more rapidly. You may have heard the horror stories of homeowners having the price of their home slashed because it emerged that Japanese knotweed was present on their property or property developers being refused planning permission due to Japanese knotweed being found on the site.

Japanese Knotweed and Mortgages

Winter stand found during a Japanese knotweed survey
Winter stand of Japanese knotweed

If a surveyor finds Japanese knotweed on a site and includes this in a report, it can seriously harm the chances of a loan provider giving you the funds you need. Some lenders including Barclays and Santander require that you get a professional in to eradicate the knotweed before a mortgage offer is made. Knotweed eradication can cost in the region of £3000 and it can take some time to sort out the problem, with treatments sometimes needing to be done over a number of seasons.

Other lenders have slightly more flexible guidelines. Nationwide, Northern Rock and Clydesdale all require a report from a specialist surveyor before they would consider lending. Mortgage lenders are worried about lending on houses that are infected with Japanese knotweed because infestations can seriously affect the ability for the property to be resold in the future and in extreme circumstances the roots can even affect drainage systems and foundations.

Starting Your Japanese Knotweed Survey

Arbtech can provide a Japanese knotweed survey by our experienced consultants. It is important to seek professional advice if you have been asked to obtain a Japanese knotweed survey and the first step is to simply give us a call or fill in the quote form by clicking on the ‘Get a Free Quote’ button on this page. We will be able to provide you with a free quote that explains everything you need to know.

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