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Japanese knotweed removal Services
Cost-effective, professional treatment with insurance-backed guarantees for both residential and commercial properties.
What is Japanese knotweed?
Described by the Environment Agency as “the UK’s most aggressive, destructive, and invasive plant,” Japanese knotweed has a powerful root and rhizome system that spreads deep into the ground. Left untreated, it can cause serious property damage and devaluation. Professional removal is essential to prevent its regrowth and associated risks.
How to Identify Japanese Knotweed
Accurate identification is crucial. Use our FREE identification service—simply send us a photo, and our experts will confirm if it’s knotweed. Additionally, our video and seasonal photo guide can help you spot it year-round.
Beyond identification, key factors include:
- The plant’s maturity and extent of spread.
- The underground rhizome system’s condition.
- Soil and site conditions where it’s growing.
For accurate results, we recommend a professional site survey. This ensures we can design a tailored Japanese Knotweed Management Plan (JKMP) to maximise treatment success.
How We Remove Japanese Knotweed
Resi-Dig-Out™
Knotweed Herbicide Treatment
Our specialists will recommend the best approach based on the infestation’s size, maturity, and site conditions. The right method will also depend heavily on what you want to do with the space afterwards and how long you are prepared to wait for the results.
Why Choose Environet?
Market-Leading Guarantee
Receive an insurance-backed guarantee for up to 10 years, accepted by all major mortgage lenders
Flexible Solutions
Tailored removal methods for every property type
Expertise You Can Trust
PCA accredited professionals who care about their customers
What our clients say
Reviews
What our clients say
Reviews
Excellent service throughout
by Customer
Professional and courteous
by Catherine Christie
Japanese Knotweed removal
by A Heather
Excellent service throughout
by Customer
Environet I give you 5 stars
by Francis
Cost of Japanese Knotweed Removal
The cost of removal depends on factors such as infestation size, site conditions, and the chosen method. Below is an indicative range of industry prices:
| Area affected | Lower limit | Upper limit |
|---|---|---|
| 5m | £2,100 | £12,000 |
| 25m | £3,250 | £30,000 |
| 50m | £4,000 | £60,000 |
For more details, read our guide to knotweed removal costs.
Why Act Now?
Ignoring Japanese knotweed can lead to:
- Property Devaluation: Knotweed can reduce property value by up to 10% and deter potential buyers.
- Legal Issues: Landowners are liable if knotweed spreads to neighbouring properties.
- Structural Damage: Knotweed can damage patios, walls, and foundations over time.
Case Studies
Resi-Dig-Out™, Bolton
Resi-Dig-Out, Suffolk
Dig & Dump, West Sussex
Resi-Dig-Out™, Runneymede
Resi-Dig-Out™, Cardiff
Resi-Dig-Out™, Thames Valley
Resi-Dig-Out™, Highgate
Resi-Dig-Out™, Bath
Excavation & treatment, Bridgend
Xtract™, Folkestone
Xtract™, Derby
Xtract™, Putney
Protect Your Property Today
Don’t let Japanese knotweed devalue or damage your property. With Environet’s expertise, innovative methods, and guaranteed solutions, you can regain control. Contact us today for a site survey and a customised treatment plan.
Japanese knotweed FAQs
The simple answer is Yes. You’re legally obliged to disclose whether the property is “affected” when selling and mortgage lenders will impose conditions that could prompt a buyer to renegotiate or even walk away. But don’t panic, a professionally prepared and actioned Japanese Knotweed Management Plan normally returns the value close to the “non-affected” value. Check out this online calculator to get an idea of how your property’s value might be impacted.
If you’re tempted to treat it yourself, consider these points:
- Most people attempting a DIY solution will fail, making subsequent professional treatment more complicated and expensive.
- Using chemicals purchased from a garden centre or DIY store will rarely be strong enough to kill the underground root system, and will often result in dormancy which means that even if the plant appears to be dead above ground, the underground rhizome remains very much alive ready to regrow at any moment.
- Killing Japanese knotweed with bleach,vinegar or diesel does not work!
- Burning Japanese knotweed is also not recommended, as you are not safe from regrowth, and may be open to other implications.
- Damage to other prized plants may be caused by poor herbicide application.
- DIY treatment won’t provide you with much of a legal defence if it spreads into your neighbours’ land.
- Digging out the rhizome system is difficult; it’s best left to professionals.
- You won’t get the all-important insurance-backed guarantee which could make it very difficult to sell your property in the future and adversely affect its value.
To determine the knotweed infected area in sq m on a subject property measure/approximate the length and breadth of the visible Japanese knotweed at ground level. Multiply the length x breadth to give you the total visible in sq m. As knotweed rhizome spreads laterally underground the actual area of infestation is greater than is visible above ground. A buffer zone is therefore added in each direction to the visible length and breadth of 1-2m or more in exceptional cases.
If there are 2 stands of Japanese knotweed within 2m of each other, it is likely that these are interconnected underground and should be classed as 1 stand when measuring the length and breadth.
That’s easy – just email us your pictures! Environet offers a free, same-day identification service. Just send us some close-up pictures to [email protected] and we’ll let you know if it’s knotweed you’re dealing with. Once we’ve checked the pictures, we can talk you through the next steps.
Japanese knotweed isn’t always visible to the naked eye, for example during winter when the plant dies back, or if it’s been herbicide treated in the past it may be lying dormant beneath the ground and could begin to regrow at any moment. Sometimes people try to deliberately conceal knotweed.
For this reason, it’s important to use an expert to determine whether your property is affected.
GET IN TOUCH
Contact us
Our team of experts is available between 9am and 5:30pm, Monday to Friday to answer your enquiries and advise you on the next steps
Want a survey?
If you already know you have an invasive plant problem, you can request a survey online in less than two minutes by providing a few brief details. A member of the team will swiftly come back to you with further information and our availability.
Need quick plant identification?
Simply upload a few images of your problem plant to our identification form and one of our invasive plant experts will take a look and let you know, free of charge what you are dealing with. We’ll also be there to help with next steps where necessary.
