Japanese knotweed on or near a property is something a valuer assesses rather than something that decides the answer on its own. This explains what the current surveying standard asks a valuer to look at, why the old seven-metre measure was dropped, and what you can establish yourself before anyone visits.
Nobody can tell you online whether a lender will proceed. What follows is what the surveying standard actually asks, what one lender actually publishes, and the paperwork that makes the first conversation a short one.
Equity release may involve a lifetime mortgage, secured against your property, or a home reversion plan. It will reduce the value of your estate and impact funding long-term care.
There is no national rule that says knotweed stops equity release. There is a surveying standard that tells a valuer how to categorise what they find, and there are lenders who each decide what to do with that category. Those are two different things, and they have moved apart.
A refusal from one provider is that provider’s answer on one product on one day. It is not a verdict on your home, and it is not the end of the question.
No seven-metre rule. Off-site growth is assessed within 3 metres of the boundary, inside a four-category assessment.
RICS, effective 23 March 2022“More than 7 metres away from habitable spaces, conservatory and/or garage of the property”
Legal & General, opened 6 September 2026. Their criteria add: “This is subject to valuers comments.”Both were opened on the same day. Both are current. That is why a page cannot tell you the answer, and why the question is worth taking to somebody with access to more than one provider.
The current RICS standard gives a valuer a decision tree that ends in one of four management categories. The wording in quotation marks below is RICS’s own, from the journal article written by the standard’s technical author. The plain-English line under each is ours.
“Japanese knotweed is present and is causing visible material damage to a significant structure.”
The plant is doing visible damage to something that matters structurally.
“no material damage to structures, but that Japanese knotweed is likely to prevent use of or restrict access to amenity space.”
Nothing is damaged, but part of the garden or access to it cannot be used.
“Japanese knotweed is present, but it is not causing damage or affecting amenity.”
It is there and it is not doing anything, so it is managed rather than treated as a problem.
“infestations seen off-site within three metres of the boundary”
It is on somebody else's land, close enough to the boundary to be worth recording.
A category is a description of what is there, not an instruction to a lender. Two providers can read the same category and reach different answers, and the same category can mean different things on a terrace and on a smallholding. There is no published percentage that a category takes off a valuation, and anybody quoting you one has made it up.
The seven-metre measure came from the paper that preceded the current standard. A House of Commons committee described it as a “blunt instrument”, and the research that followed reported three metres as being a more appropriate distance to use for the likely spread of an infestation. RICS dropped it when the new standard took effect on 23 March 2022.
It has not gone away, because it was written into places that do not update when a surveying standard does. Legal & General’s published lifetime mortgage criteria still use it, and we opened them on 6 September 2026 to check. So a reader can be told seven metres by a lender and three metres by a surveyor in the same week, and both will be quoting something real.
This is the single most useful thing to know before the conversation: if somebody gives you a distance, ask whose distance it is.
Equity release requires repaying any existing mortgage. Money released, plus accrued interest, would need to be repaid upon death or moving into long-term care.
We have not said whether your property would be accepted, what your home is worth with knotweed on it, or which lenders will proceed. We cannot: we are not advisers, we have not seen your garden, and criteria differ between providers and between products from the same provider.
None of this needs a phone call and none of it commits you to anything. Somebody who arrives at an adviser holding the treatment guarantee and a note of where the plant actually is gets a far better hour than somebody who arrives worried.
If you have none of it, that is not a problem either. It is simply the first thing an adviser will help you chase.
Take these to an adviser or a valuer. They are the questions that get a useful answer, and every one of them is something we are not allowed to answer for you.
Which RICS management category did the valuer record, and why that one?
The category is the valuer's conclusion in one letter. Asking which one, and what drove it, turns an opinion you cannot see into something you can discuss.
Does this lender use the RICS categories, or its own distance rule?
They are not the same test and they can reach different answers on the same garden. An adviser with the whole market can tell you which providers use which.
Is my treatment guarantee insurance-backed, and is it transferable?
A guarantee that ends if the contractor closes, or that does not pass to a buyer, is worth less to a lender than one that survives both.
Would a current specialist survey change the assessment?
Sometimes the cheapest way forward is a fresh report rather than an argument. Ask what it would need to say, and what it would cost, before commissioning one.
If this provider will not proceed, which ones might, and on what basis?
A refusal is one lender's answer on one product on one day. Ask for the reason in writing, because the reason is what another provider will be assessing.
Short answers to the things that come up most. None of it is advice, and every figure on this page carries its source.
No. The RICS professional standard sorts it into categories, and only one of them is the plant causing visible material damage to a significant structure. The others cover restricted use of garden space, presence without damage, and growth on somebody else land near the boundary.
Not in the RICS standard. The research it drew on reported three metres as a more appropriate distance for the likely spread of an infestation. One lender does still publish a criterion of more than 7 metres away from habitable spaces, conservatory or garage, subject to valuer comments, which is a lender rule rather than a surveying one.
Any survey that already mentions it, the treatment plan and record of visits from whoever treated it, the guarantee and who backs it, and roughly how far the nearest growth is from the house, the conservatory and the garage.
An insurance-backed guarantee is underwritten by an insurer rather than by the contractor, which matters if the contractor is no longer trading.
Equity release may involve a lifetime mortgage, secured against your property, or a home reversion plan. It will reduce the value of your estate and impact funding long-term care.
One qualified equity release adviser. They will go through your figures and tell you if there is a better answer. It costs nothing and commits you to nothing.
Google Analytics, Microsoft Clarity and Vimeo. Say no and none of them loads. What each one stores, and what Microsoft use theirs for.