Japanese Knotweed

Does Japanese Knotweed Require action?

If Japanese knotweed is present, it must be dealt with in line with government regulations. It is governed by the Wildlife and Countryside Act 1981, the Environmental Protection Act 1990, and the Anti-social Behaviour, Crime and Policing Act 2014 across residential and commercial sites.

Our process begins by having a detailed Japanese knotweed survey carried out, we would then write up a management plan, along with recommendations. For a typical domestic property the cost of this necessary survey and management plan will cost £312 incl. VAT. The management plan in simplistic terms is a document which outlines how we would eradicate the Japanese knotweed whether that be through chemical treatment or excavation.

Being commercially minded, our recommendations will always take into account the requirements of the owner, site conditions, whether the property is being purchased or sold, along with any other constraints.

In practice, this means:

Professional identification is about formally confirming whether Japanese knotweed is present, its extent, and how it affects the site and any plans for the site.

Until that position is confirmed, property and land are treated as uncertain — which can affect value, delay transactions, and expose parties to avoidable risk.

What Happens Next

Step 1

Initial discussion and advice

We discuss your situation and confirm whether a formal survey is required at this stage.
Step 2

Professional survey and management plan

An accredited survey confirms presence and extent. We set out the appropriate removal strategy based on the individual site.
Step 3

Implementation of the management plan

Where triggered, works are undertaken in line with the management plan defined at Step 2.
Step 4

Ongoing support and assurance

Where applicable, this includes monitoring, insurance-backed guarantees, and support for future transactions.

What This Gives You

With over 28 years of experience, £5 million indemnity insurance, 10-year insurance-backed guarantee and a 5 star Google rating, we deliver professional, dependable solutions for complete peace of mind.

What This Gives You
What the report provides	Why this matters
A clear document on whether Japanese knotweed is present or not	It removes uncertainty and provides documentation that can be presented to solicitors or lenders enabling you to proceed with the purchase or sale
The area covered and where the Japanese knotweed has come from	Allows you to assess the risk and makes it clear if other parties are involved
A clear plan to move forward and all associated costs	Allows fair appraisal of the value of the property and enables you to make a fully informed decision

This shifts the situation from unknown to defined. Transactions, planning, and project decisions can proceed on the basis of confirmed information, rather than hesitation or precaution.

Furthermore, reporting is prepared to a standard that can be relied on by lenders, solicitors, and other professionals involved in the process.

Japanese Knotweed Expert operates across England and Wales, offering professional surveys typically within 48 hours with all management plans written up and emailed within 24 hours of the site survey. Options for Japanese knotweed control are chemical treatment or excavation with all our work having a 10-year insurance-backed guarantee.

What Are the Risks of Not Dealing With Japanese Knotweed Properly?

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Japanese knotweed can become more difficult and costly to manage if it is disturbed, allowed to spread or treated without an appropriate plan. Therefore, professional Japanese knotweed treatment should begin with a clear assessment of the infestation, the site conditions and how the property or land is being used.

The most common risks of Japanese knotweed include:

Lender or solicitor requests for further information late in the process
Delays to planning or development decisions while clarification is sought
Repeat surveys or duplicated costs when earlier information is not accepted; due to unqualified people surveying or writing the reports
Escalation of neighbour disputes where legal responsibilities are unclear
Ongoing uncertainty that affects value, timing or future flexibility

These risks aren’t about severity — they’re about ambiguity. Until the position is clearly defined and supported by appropriate documentation, progress often slows by default.

Addressing the issue properly at the outset is what prevents those downstream complications from emerging later. All our reports are prepared by experienced specialists and aligned with recognised industry standards.

If Japanese knotweed is not managed correctly, the consequences can extend beyond the original infestation. In addition, cutting, digging or moving affected soil without suitable controls can spread viable plant material into new areas. As a result, professional Japanese knotweed removal may require herbicide treatment, monitoring or Japanese knotweed excavation, depending on the circumstances. As experienced Japanese knotweed specialists, we can recommend the most appropriate approach and reduce the risk of further spread.

Costs & Timeframes

Costs and timeframes for Japanese knotweed removal depend on what’s present, the extent of the growth, and how it interacts with what’s already underway.

Surveys & Associated Reports – £312 including VAT*
Chemical Treatment Costs – 85% of the jobs we do are between £3,000-£5,000 +VAT
Residential Excavation Costs – Typically greater than £12,000 +VAT
Commercial Excavation Costs – Typically greater than £20,000 +VAT**
Surveys within 5 working days unless fast tracked with reports issued within 24 hours of the survey
Herbicide treatment takes 3 years with a further 2 years of monitoring
Excavation of Japanese knotweed takes place 4 weeks after sign off but can also be fast tracked

Guarantees & Assurances for Japanese Knotweed Removal

Where treatment or removal is carried out, this is supported by:

Herbicide Treatment – a 10-year company guarantee & a 10-year insurance-backed guarantee on excavation
Excavation – 5 year company guarantee & a 10-year insurance-backed guarantee

These guarantees are designed to provide long-term assurance, supporting future sales, lending decisions, and ongoing management where required.

Treatment Methods

Herbicide Treatment

Effective, compliant control of Japanese Knotweed

Spraying is carried out when Japanese knotweed is actively growing, using professional grade systemic herbicides that are not available to the public.

Treatment typically involves three applications between August and October for the first three years, followed by two years of monitoring to confirm complete removal.
Excavation

Rapid removal for time-critical projects

This approach is typically used on development sites where rapid removal is required to keep projects on programme and there is no time to wait for herbicide treatment and associated monitoring periods.

Frequently Asked Questions

How much is a site survey?

A site survey starts from £260 + VAT, this is dependent on the size and location of the stand.

If I decide to proceed with the plan how soon does treatment start?

Treatment takes place between August -October and we treat once a month for 3 years. We then monitor for 2 years.

Do I legally have to deal with Japanese knotweed?

Yes. Japanese knotweed is a regulated invasive plant, and where it is present, it must be managed in line with established requirements. The obligation isn’t optional — the key question is what level of response is appropriate for the situation and timing involved.

Can I sell or buy a property with Japanese knotweed present?

Yes, but the position needs to be clearly established. Transactions typically rely on professional confirmation of whether knotweed is present, its extent, and whether management or treatment is in place. Uncertainty, rather than the presence of knotweed itself, is what most often causes delay.

Will lenders accept a Japanese knotweed report?

Lenders usually require professionally prepared documentation that clearly sets out the findings and any required action. Surveys and reports prepared to an appropriate professional standard are designed to meet those expectations and support lending decisions.

Do I need a survey before I decide what to do?

In most cases, yes. A survey is how the position is formally established. Until that point, decisions are based on assumption rather than confirmed information, which can lead to delay or unnecessary cost later.

What happens if Japanese knotweed is found?

If knotweed is identified, the survey will confirm its extent and what action is required. Where treatment or removal is needed, the response is matched to the site, timing, and future use — not applied automatically or disproportionately.

Is treatment always required, or are there alternatives?

Not every situation requires immediate removal. In some cases, management or monitoring may be appropriate. The correct approach depends on risk, use of the land, and external requirements such as lending or planning.

How long does Japanese knotweed removal take?

Timeframes vary depending on the treatment method used. Some approaches provide rapid clearance, while others are longer-term management strategies. Where removal is required, programmes are aligned with transaction timelines or development schedules wherever possible.

Are guarantees provided after treatment?

Yes. Where treatment or removal is carried out, this is supported by a 10-year company guarantee and a 10-year insurance-backed guarantee, providing long-term assurance for future transactions and ongoing management.

Book a professional survey today

If Japanese knotweed is affecting your home, land or development site, our experienced Japanese knotweed specialists can provide a clear route forward. We offer professional Japanese knotweed removal, targeted Japanese knotweed treatment and full Japanese knotweed excavation where faster remediation is required.

Contact Japanese Knotweed Expert for specialist advice, management plans and professional Japanese knotweed removal across England and Wales.

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