Professional Japanese knotweed site surveys across Hampshire, West Sussex & Surrey
A Japanese knotweed survey is the first and most important step in identifying, assessing, and managing this invasive plant. Whether you are a homeowner, buyer, seller, landlord, or developer, our professional surveys provide the clarity, documentation, and peace of mind you need to protect your property and ensure compliance with lender and legal requirements.
At Knotweed Specialists UK, we have over 20 years of experience in Japanese Knotweed identification, control, and removal across the South Coast. Our CSJK-qualified surveyors are Property Care Association (PCA) members and follow RICS 2022 guidelines, ensuring your report is accepted by mortgage lenders, insurers, and local authorities.
To book your Japanese knotweed site survey, call Knotweed Specialists UK on 023 8251 2752 or email enquiries@knotweed-specialists.com.
What is a Japanese knotweed site survey?
A Japanese Knotweed survey is a detailed on-site inspection carried out by qualified specialists to determine whether knotweed is present on or near your property.
During the survey, we:
- Conduct a thorough inspection of the land, gardens, and boundaries
- Identify and record any visible signs of Japanese knotweed
- Assess the maturity, density, and spread of the infestation
- Evaluate potential risks to buildings, drains, and neighbouring land
- Provide photographic evidence, maps, and professional recommendations
All surveys follow PCA and RICS (Royal Institution of Chartered Surveyors) standards, ensuring full compliance for property transactions and insurance purposes.
What’s included in our Japanese knotweed survey report
Every Japanese knotweed site survey we carry out results in a detailed, easy-to-understand report that includes:
Every survey we complete includes a comprehensive, easy-to-understand report covering:
- Confirmation of whether Japanese Knotweed is present
- Site plans and photographs identifying affected areas
- Assessment of severity and spread of infestation
- Evaluation of risks to property, boundaries, and drainage systems
- RICS Risk Category (1–4) assessment
- Recommended treatment or removal methods
- Legal and mortgage guidance
- Optional Management Plan (KMP) for mortgage lender approval
If you are buying or selling a property, this report can be used to support your transaction and meet lender requirements.
Who needs a Japanese knotweed site survey?
Homeowners & buyers
If you’re buying or selling a property, a Japanese knotweed survey provides the clarity and documentation lenders and buyers need. Mortgage providers often require a formal Japanese knotweed management plan backed by a survey report. Our surveys ensure there are no surprises later in the process.
Landlords & business owners
For commercial properties, rental units, or development sites, a site survey helps identify potential risks before construction or leasing. We assess how knotweed could affect structural works or site plans and provide clear steps for remediation.
Land owners & developers
Councils, landowners, and developers rely on our Japanese knotweed site surveys to inform planning and construction projects. Identifying knotweed early prevents costly project delays, helps maintain legal compliance, and supports risk management.
Our survey process
- Initial consultation – We’ll discuss your concerns, location, and any visible signs before arranging a convenient visit.
- On-site inspection – A qualified technician carries out a full site assessment, examining vegetation, boundaries, and potential spread to neighbouring land.
- Risk evaluation – We assess the proximity to structures and potential damage risks, in line with RICS 2022 knotweed risk categories.
- Report & recommendations – You’ll receive a comprehensive Japanese knotweed survey report outlining our findings and a recommended management plan.
- Treatment planning – If knotweed is found, we’ll propose tailored solutions, such as herbicide treatment, excavation, or containment — all with insurance-backed guarantees.
How much does a Japanese knotweed survey cost?
The cost of a Japanese knotweed site survey depends on several factors — including property size, location, and infestation level. In most cases, surveys represent excellent value compared to the potential cost of property damage or devaluation caused by untreated knotweed.
- Free surveys may be available when you proceed with a treatment plan.
- Clear, transparent pricing with no hidden costs.
Call us today on 023 8251 2752 for a free quotation and expert advice.
Legal & mortgage considerations
The presence of Japanese knotweed can affect property sales, valuations, and mortgage applications. Many lenders now insist on a professional Japanese knotweed survey and management plan before approving a loan.
Under UK law, allowing knotweed to spread from your land to another property could result in fines or legal action under:
- Wildlife and Countryside Act 1981 (Section 14)
- Environmental Protection Act 1990 (Section 33)
- Anti-Social Behaviour, Crime and Policing Act 2014
A Japanese knotweed site survey not only protects you legally but also provides the documentation needed to satisfy potential buyers, lenders, and insurers.
Book your Japanese knotweed site survey today
Don’t leave it to chance — early detection can save you thousands in future costs. Whether you’re worried about an unusual plant in your garden, preparing for a property sale, or starting a development project, our Japanese knotweed survey specialists can help.
Call us on 023 8251 2752 or email enquiries@knotweed-specialists.com to book your Japanese knotweed site survey today.
What our clients say
FAQs
Should you buy a property with Japanese knotweed nearby?
Buying a house with Japanese knotweed should not be done without careful consideration, but with informed decision-making and proper precautions, the invasive weed need not be a deal breaker. While the persistent nature of this fast-growing weed has made it one of the most tenacious issues facing property owners, some steps can be taken to address its pervasive presence.
As a buyer, you should understand both your legal obligations for this plant and what preventative measures can be taken to contain it. A Japanese knotweed site survey is the best way to know for sure whether the infestation is something to worry about.
Should I get a Japanese knotweed survey?
If you are considering buying a property, or have recently purchased one, having a knotweed survey done is an important part of the process. Japanese knotweed is an invasive species that can cause incredible destruction to any given area if it is not properly managed.
A Japanese knotweed site survey can provide you with critical information about the presence of this plant on your land so that you can take measures for prevention and control as necessary. Investing in a knotweed survey does more than just save money in the long run; it also provides peace of mind knowing that your environment is protected from Japanese knotweed.
Is it easy to sell a house with Japanese knotweed?
Selling a house with Japanese knotweed can often be a daunting prospect, as this invasive plant species is destructive and notoriously difficult to eradicate. As such, it can be tempting to just ignore the issue and hope potential buyers won’t notice. This approach could cause financial disaster down the line.
To avoid potential problems, homeowners should undertake a full professional Japanese knotweed survey to assess the extent of the infestation and develop a plan that outlines what steps need to be taken in order to make the property safe. With an informed action plan in place, selling a house with Japanese knotweed does not have to be a nightmare scenario for either the homeowner or buyer.
Should you buy a property with Japanese knotweed nearby?
When searching for a new home, it is important to consider all potential risks, including those posed by Japanese knotweed. This invasive plant has caused major damage to properties and their value, often making it difficult to sell or remortgage in the future. However, there are steps you can take if you have an affected property or intend to purchase one.
Reputable and trusted Japanese knotweed removal services exist, and are often able to quickly and efficiently eradicate the problem. Ultimately, if you do decide to buy a property with Japanese knotweed nearby, make sure you are fully aware of the risks and take appropriate action going forward.
