Introduction

If you’re planning to sell your home and have discovered Japanese Knotweed on your property — don’t panic. While this invasive plant can complicate a sale, it doesn’t make it impossible. In fact, with the right professional support and documentation in place, you can sell your home legally and successfully in 2025.

This guide explains everything UK homeowners need to know, from your legal obligations to how knotweed affects valuations, mortgages, and buyers.

Is It Legal to Sell a House with Japanese Knotweed?

Yes — it is legal to sell a house with Japanese Knotweed as long as you disclose its presence honestly and take reasonable steps to manage it. Failure to do so could lead to the buyer suing for misrepresentation.

Your Legal Obligations as a Seller

1. Disclosure on the TA6 Form

The Law Society’s TA6 Property Information Form is a key part of the home-selling process. Section 7.8 specifically asks:

“Is the property affected by Japanese Knotweed?”

You must answer:

  • Yes – if knotweed is present, even if it’s being treated

  • No – only if you have written evidence there’s no knotweed and no history of it

  • Not Known – if you’re genuinely unsure (not a way to avoid disclosure)

Failing to answer truthfully is grounds for legal action.

2. Provide Documentation

If knotweed has been treated, include:

  • A management/treatment plan

  • A 5–10 year insurance-backed guarantee

  • Survey reports and photos

Buyers (and mortgage lenders) will often request this upfront.

How Does Japanese Knotweed Affect the Sale?

1. Property Value

Knotweed can reduce your property’s market value by 5–15%, depending on how close it is to the structure and how severe the infestation is.

2. Buyer Confidence

Buyers may walk away unless:

  • A professional contractor is handling the issue

  • A long-term guarantee is in place

  • Clear evidence of treatment is shown

3. Mortgage Approval

Most UK lenders will not approve a mortgage unless:

  • A PCA-accredited contractor (like us) is treating the knotweed

  • An insurance-backed guarantee is provided

Some lenders may impose higher interest rates or require proof of treatment before issuing an offer.

What If I Hide the Knotweed?

This is a serious legal risk. If you say “No” to knotweed on the TA6 form and it’s later discovered, the buyer may:

  • Sue you for misrepresentation under the Misrepresentation Act 1967

  • Demand compensation for removal costs and loss of value

  • Attempt to reverse the sale in extreme cases

A 2019 UK case saw a seller fined over £200,000 after misleading the buyer.

Steps to Sell a Property with Knotweed (2025 Checklist)

✅ Book a professional site survey
✅ Start a treatment plan with a PCA-approved contractor
✅ Obtain a long-term insurance-backed guarantee
✅ Gather documentation for your solicitor
✅ Be honest on the TA6 form
✅ Work with estate agents who understand the issue

Case Study: Sale Success Despite Knotweed

Property Type: 4-bed detached home in Bridgend
Issue: Moderate knotweed growth 6m from property
Actions Taken:

  • Hired Japanese Knotweed Elimination Ltd

  • Treatment plan and 10-year guarantee in place

  • Full disclosure made on TA6
    Outcome: House sold within 4 months at 96% of asking price

Frequently Asked Questions

Q: Will knotweed ruin my house sale?

A: Not if it’s treated and disclosed. Many homes in the UK sell successfully with managed knotweed issues.

Q: Do I have to reduce the price?

A: Possibly. Buyers may negotiate, especially if they perceive ongoing risk. The more proactive you are, the less leverage they have.

Q: Can I sell to a cash buyer to avoid mortgage issues?

A: Yes — some sellers choose this route, especially for faster sales. However, cash buyers often offer below market value.

Why Choose Japanese Knotweed Elimination Ltd?

  • PCA-Qualified Technicians

  • Fully Compliant with Lender Requirements

  • Insurance-Backed Guarantees for 5–10 Years

  • Fast Documentation for Solicitors & Agents

  • Friendly, Local Service in Wales and the West

Ready to Sell With Confidence?

We help homeowners across Wales and the UK protect their property sale and restore buyer trust. If you’re looking to sell a house with Japanese Knotweed, contact us today for a no-obligation survey and treatment plan.

Call Now: 07582 869979

Or visit www.knotweed-wales.com to request your free quote.