First Time Buyer Meets Japanese Knotweed

The Guardian recently published an article about a first time buyer encountering Japanese Knotweed on the property he is proposing to purchase.  The potential buyer discovered that the property has Japanese Knotweed only after making the offer. The article mentions that digging up knotweed is a thankless task.  Although digging up knotweed is not easy as the rhizomes can be up to 3 metres deep, if done correctly is very successful and often eradicates the weed and removes the problem.  Herbicide chemical control will manage the problem and stop the spreading but will not remove the knotweed contaminated soil.

The author states within the article that he should have asked his solicitor to find out if there were any issues around knotweed before making the offer. However, this question should have been on the TA6 form.  When looking to buy a property, always make sure you have read the Instructions to Buyers at the beginning of the Law Society Property Information Form (TA6).  On question 7.8 within the TA6 form, it states

“The seller should state whether the property is affected by Japanese Knotweed.  Japanese knotweed is a non-native invasive plant that can cause damage to property. Japanese knotweed requires several years of treatment before it can be eradicated. A Japanese knotweed management plan can help to control the spread of Japanese knotweed and eradicate it. Most management plans provide a record of works carried out to control Japanese knotweed. They can provide reassurance to mortgage lenders who may be concerned about the impact of Japanese knotweed on the value of the property. Sellers should provide a copy of any Japanese knotweed management plan to the buyer.”

Based on the above, it is the seller’s responsibility to declare whether Japanese Knotweed is present on the property.  It is not the responsibility of the buyer to check for knotweed when viewing the property. Rather, the best method is to get the garden surveyed by a knotweed specialist.  If knotweed is present then the current owner might have a Knotweed Management Plan (KMP) in place and this should be made available to the potential buyer.  The article noted that a survey has been carried out but the garden and grounds weren’t inspected. Instead of relying solely on the surveyor to identify knotweed, a specialist knotweed survey should be carried out in conjunction with the normal survey as this is aimed at identifying knotweed in many cases in the winter and providing the best remedial action.

Coming back to Herbicide Chemical Treatment it does control and eradicate the surface growth BUT does not remove the deep rooted rhizomes. Only excavation can do this. And chemical treatment can take 3 or 4 years to stop aerial growth appearing.  Removal by excavation is by far the most long term reliable remedial solution especially if the knotweed is close to buildings and landscaped areas. Only a specialist knotweed survey which costs £150 plus VAT from Japanese Knotweed Ltd will be able to advise whether chemical treatment or excavation is best.

If you find Japanese Knotweed in the property you wish to buy, this needn’t be too much of a problem as it only needs to be managed properly and professionally. The true damage and impact can be clearly assessed and if this is significant, the problem can be removed by excavation.  Structural damage caused by Japanese Knotweed is very rare and increased cost to extensions is common.

Judging things from the article, it is the lessees who should pursue the management company to manage the knotweed problem professionally and transparently.  The TA6 form would have asked the current owners to declare the presence of Japanese Knotweed and it is advisable to get a specialist knotweed survey done on the property to make sure no knotweed is present.

Japanese Knotweed Ltd is a PCA accredited company and the UK’s largest knotweed eradication company. For more information about a survey and treatment options email info@knotweed.co,uk or call 0333 2414 413.

Alex Evans

You May Also Enjoy

Estate Agent Talk

Renting an Apartment for Streaming and Gaming: What to Check Before Paying the Security Deposit

For those who stream or compete online from home, choosing a place to live becomes a task with many variables. Beautiful photos in a listing say little about whether an apartment is suitable for a home studio, stable livestreaming, and long hours in front of a monitor. The decision should be based not on the…
Read More →
Breaking News

London rents outperform property values

The latest research by London lettings and estate agent, Benham and Reeves, has revealed that rental growth has outperformed house price growth across 26 of London’s 32 boroughs since the start of the year, with rents continuing to climb despite weaker property price performance across much of the capital. Benham and Reeves analysed the average…
Read More →
Breaking News

Rental property availability falls

The number of rental properties available across England fell by 12.1% during the third quarter of 2026, according to new analysis by Dwelly, highlighting an increasingly competitive rental market in many parts of the country. Dwelly is one of the UK’s largest rental property management groups, with more than 15,000 properties under management. The firm’s…
Read More →
Breaking News

Average advertised rents surpass £1,400 for the first time

The average advertised rent of homes outside London has risen to a new record of £1,418 per calendar month, up 1.5% this quarter: Despite a new record rent, annual rental growth has returned to a more stable level of +2.4% Number of available rental homes nationally is 2% lower than a year ago, while renter…
Read More →
Breaking News

Barclays unlocks wider mortgage access for company directors

Limited company directors who meet the income threshold can now have their Profit After Tax (PAT) considered in their affordability assessment regardless of property value The change means that, for a wider group of limited company directors, Barclays will consider a fuller view of the applicant’s income The update is the latest in a series…
Read More →
Breaking News

Homebuyer demand fall in Q3

The latest sales demand data from eXp UK has revealed that homebuyer demand in England slipped by -1.6% in Q3 2026. The analysis shows that just five counties managed positive growth during the quarter, suggesting that buyers may be holding back, adopting a wait-and-see approach ahead of what promises to be a vital Autumn Budget –…
Read More →