Environment Agency, NRW and Defra: who you have to notify and when
Notifications, permits and exemptions for knotweed work near watercourses, on common land, and on regulated sites.
Most domestic knotweed treatment needs no formal notification. The moment you are near water, on protected land, or planning to bury material on site, the rules tighten quickly.
Watercourses
An aquatic-use glyphosate product (e.g. Roundup ProActive) applied by a PA1 + PA6AW operator under an Environment Agency / NRW permit is the only legal route within 5 m of any watercourse — including ditches, brooks, ponds and the sea wall.
On-site burial
Up to 1,000 m³ of knotweed-affected soil can usually be buried on site under a Deposit for Recovery (DfR) exemption, provided the engineering follows the regulator's published guidance and the cell is permanently recorded.
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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