Neighbour knotweed disputes after Davies v Bridgend: what to do, in order
A practical step-by-step for homeowners whose neighbour has knotweed and won't act on it.
The Supreme Court's decision in Davies v Bridgend County Borough Council [2024] UKSC clarified that a defendant is liable in private nuisance for knotweed encroachment from the moment they knew or ought to have known about it — not only from the moment physical damage occurs. That changed the calculus for every neighbour dispute we handle.
Step 1 — Get evidence
Commission a written survey from a PCA-member contractor. The report identifies the species, maps the encroachment, dates the photographs, and quantifies the diminution in value. Without it, a claim is a he-said-she-said.
Step 2 — Write to the neighbour
A polite, factual letter (or your surveyor can send one on your behalf) outlining the finding, attaching the report, and inviting them to commission joint treatment. About 70% of disputes end here.
Step 3 — Solicitor's letter before action
If there's no engagement after 28 days, a property litigation solicitor can issue a letter before action setting out the Davies v Bridgend authority and proposing remedy. We've seen this resolve another 25% of cases.
Step 4 — Issue proceedings
Last resort. The remedies are typically a mandatory injunction requiring treatment plus damages for diminution in value. Courts have been awarding £6,000–£18,000 in domestic cases, plus costs.
Frequently asked questions
- Do I have to prove damage to my property to claim?
- No. Following Davies v Bridgend, interference with the use and enjoyment of your land is sufficient — physical damage is no longer a precondition.
- How long does a claim take?
- Most resolve within 60–90 days at the surveyor or solicitor letter stage. Issued claims that go to trial typically take 9–14 months.
Reviewed by
The survey team
PCA-certificated surveyors, Japanese Knotweed Elimination
PA1 / PA6A certificated surveyors who carry out the site visits, write the management plans and sign off the reports issued to lenders and solicitors.
Reviews the technical, legal and lender statements in this article.
What this page can't tell you
- Guidance is general. Identification, treatment choice and timescales can only be confirmed by a site visit — photographs alone are indicative.
- Lender and insurer requirements vary by institution and change over time. We state what is typically accepted, not what any named lender will accept on your case.
- Guarantee (IBG) eligibility depends on the plan chosen, the survey findings and the underwriter's acceptance. It is not automatic.
- Legal points summarise published law and guidance current at the review date. They are not legal advice.
Last reviewed · Questions on anything stated here: 07582 869979
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