At SE Knotweed, we record a knotweed case against the RICS 2022 management categories A to D, which grade the risk to the property and its neighbours using a 3 metre zone rather than the older 7 metre one.
At SE Knotweed, we record every case against the RICS management categories A to D, the assessment framework the RICS Professional Standard 2022 introduced to grade Japanese knotweed by the management action a property needs rather than by distance alone.
The category tells a mortgage valuer and a solicitor how serious the case is and what has to happen before a sale or a loan can proceed. Our survey records the band for your site and explains what it means.
The RICS Professional Standard 2022, in force from 23 March 2022, replaced the older 2012 approach: it dropped the 7 metre zone in favour of a 3 metre zone and swapped the numbered risk categories 1 to 4 for the management categories A to D.
It also states that sound, modern foundations are unlikely to suffer structural damage from knotweed, which moved the focus from alarm to management. Valuers and lenders now read cases in this language.
The four RICS management categories run from A, the most serious, to D, where the source sits off the property. Category A means visible, material damage to a structure; B means no such damage but remediation and an insurance-backed guarantee are advised; C means the stand can be managed with limited impact; and D means the knotweed originates on adjoining land within 3 metres of the boundary.
| Category | What it indicates | Typical implication |
|---|---|---|
| A | Visible, material damage to the property or a significant structure such as an outbuilding or boundary wall | The most serious band; treatment and often repair are needed before lending |
| B | Within the 3 metre zone with no visible structural damage | A management plan and an insurance-backed guarantee are advised; the common mortgage band |
| C | Present but with limited impact on this property; the stand can be managed | Usually manageable without holding up a sale once a plan is in place |
| D | The knotweed originates on adjoining land, within 3 metres of the boundary | Your report records the off-site source; your side is planned and the neighbour position is separate |
The RICS category shapes a mortgage valuation because it tells the lender how much management the property needs: a Category B or C case usually proceeds once a plan and an insurance-backed guarantee are in place, while a Category A case may need repair as well as treatment before a valuer will lend.
The category is not an automatic refusal. Our knotweed and mortgages pillar explains how lenders treat each band and how a costed plan moves the case forward.
A category does not mean your foundations are damaged: the RICS 2022 standard states that sound, modern foundations are unlikely to suffer structural damage from knotweed, which exploits existing gaps, drains and cracks rather than breaking sound concrete.
Category A is reserved for cases where damage is actually visible, often to a lightweight structure like an outbuilding, a path or a boundary wall. The survey records what is genuinely present rather than assuming the worst.
The management categories A to D replaced the numbered risk categories 1 to 4 that the 2012 framework used, shifting the assessment from a risk score to the action a property needs. The 3 metre zone also replaced the older 7 metre one.
An older report may still refer to the 1 to 4 bands, so if you hold one from before 2022 it is worth a fresh survey to record the case in the language a current valuer and lender expect.
Your category is decided at survey by measuring the distance from the stand to the dwelling, outbuildings and the boundary, checking for visible damage to any structure, and recording whether the source is on your land or an adjoining plot.
We photograph the stand, map it against the 3 metre zone and set the finding out in the report with the reasons. Book a survey and we will record and explain your category.
To move a sale forward after a category is recorded, the step is to put a management plan and an insurance-backed guarantee in place, which is what lets a lender proceed even while treatment continues.
We produce the management plan from the survey and set out the guarantee term, so your solicitor can answer the buyer's enquiries and the valuer can release the loan.
Tell us the address and what a surveyor flagged. We confirm the plant, record the RICS category and set out the figures.