/ Home & Energy

Are weeds killing your mortgage chances?

The list of plant nightmares for your house can be quite extensive. And now some people are finding they can’t get a mortgage if Japanese knotweed has been found in their garden or even close to the property.

There are Leylandii conifers that block out your light, ivy plants pulling out your mortar and tree roots clogging up your drains. But Japanese knotweed is the one to watch out for.

Japanese knotweed looks a bit like bamboo or dogwood. It’s hardy, perennial (it lives for more than two years), and can grow to over two metres tall. It was introduced to the UK in the mid-19th century and, because it’s invasive, difficult to kill and nothing really eats it, it’s now widespread.

Weeding out the issue

Keen gardeners will know all about dealing with difficult weeds such as bindweed and ivy – but Japanese knotweed is devilish to get rid of. The Royal Horticultural Society even calls it a ‘thug’!

The creeping roots of the Japanese knotweed are extremely difficult to eradicate and it can grow back from just a centimetre of root. However, it can be killed by repeated treatment over several years with the strong weedkiller glyphosate.

If you call in the professionals it can be a very expensive job – the Royal Institution of Chartered Surveyors (RICS) estimates it can cost up to £5,000 to use other techniques like root barriers to stop it spreading while the weedkiller is working. If the knotweed is creeping in from nearby land, you’ll need a co-ordinated attack.

But what damage does it do to your house? The guidance from RICS talks about drains getting blocked by roots, patio slabs being disrupted, and buildings with shallow foundations (like garages, sheds and conservatories) being undermined. It says that more dramatic damage to buildings is very rare and exceptional.

Knot a problem?

So is Japanese knotweed a big problem when it comes to selling your house? You may have read about Peter Gingell over the weekend, whose house sale fell apart when his buyers discovered Japanese knotweed in his garden. Some mortgage lenders are even turning down mortgage applications on properties where knotweed is present.

So even if Japanese knotweed can really cause uninsurable structural problems, surely a blanket ‘no’ policy to mortgage lending isn’t the best solution? Our mortgages expert Marie Kemplay says:

‘The situation regarding knotweed is quite confusing, and although organisations like RICS have produced guidance for mortgage lenders, there are no clear cut rules. Some lenders will not offer mortgages if Japanese knotwood is present on your land whilst others will consider it providing there are some guarantees in place.

‘But one general piece of advice is, no matter how tempting, not to just rip it out of the ground yourself. You need to get professionals in otherwise you may find it difficult to prove you have taken appropriate action to get rid of the problem.’

Have you had any plant problems with your house? Would finding Japanese knotweed in the garden put you off a purchase?


So it makes sense to completely remove all of the plants before you try to sell your house. If I was buying a house I would only worry if I thought they would effect the mortgage – I’m not sure it often happens that a mortgage is actually stopped due Knot weed

bellaboo says:
1 May 2013

we have just had a mortgage application declined after valuation on a property that “apparently” has knotweed on it…

we have scoured the place and not seen ANY evidence of it, not even something that resembles it, and we haven’t even been given the opportunity to get a horticultural expert in to identify the supposed knotweed, just a flat out decline!
we feel there is a high likely hood that the valuer has misidentified “japanese knotweed” and cost us our mortgage, but we don’t even have the chance to find out WHERE he thinks he saw it, and double check…

bellaboo says:
5 May 2013

just an update- we had a survey done by a japanese knotweed specialist, and it turns out that there ISN’T any present ANYWHERE on the grounds, or even anything that could be mistaken for it, but a surveyor not knowing what he was talking about in his report caused a decline of our mortgage!

Jan says:
25 May 2013

Well it has just stopped the sale of my house. I know the plant, most of it is in a neighbouring garden and I have been treating it for over 10 years to the extent that I have eradicated to the main extent.

It seems to be this neurosis is like the earlier days of trees near to houses…. irrespective of the size or behaviour of tree root sizes …. It makes me absolutely sick that mortgage companies who are supposed to issue mortgages will use every method in the book to deny mortgage lending … and thereby economic growth… Its a bit like bankers not allowing people to open bank accounts or insurance companies not paying out on insurances…. the place has gone mad… Just glad that from this year I wont need a blinking mortgage…. and I can get shot of the evidence before the next chump with his ladder and tape measure waddles around my premises…… fume!

bellaboo says:
25 May 2013

thats just the thing isn’t it! if you eradicate any sign of it before the pen pusher comes around, all would be fine, so they are only encouraging people to hide things, which makes it MORE of a risk to the bank!
If they would just accept the insured eradication program as part of the mortgage stipulations, then it would be dealt with, and people wouldn’t need to try to hide it!

in our case, there just was NO knotweed anywhere but the valuer made it up to red line our mortgage!
we proved him wrong,with a survey from a weed expert ,so are moving forwards once again with the house sale, but its all just jolly ridiculous…

JJ says:
31 July 2014

I have a £200,000 plus house on the market that I have sold…everything going well we have bougtht another property etc…the buyers thrilled wth this house then valuer comes says house if “perfect” but mentions on vauation that on neighbouring waste land there is knotweed…caused immediate termination of Mortgage by buiding society nearest plant o my boundary is 10 metres and we have a huge wall and driveway in between…its devastating!.. as everything has now fallen through so it does happen and is happening more and more..there needs to be talks between lenders and government to stop blanket policy on this weed and some form of grading system developed as my house according to surveyor for knotweed is not at risk!

bellaboo says:
13 September 2014

I just wanted to update on my above comment.

After calling B*** S*** on the valuer, we argued our case, and hired a plant expert to do a survey to PROVE there was NO japanese knotweed on the property or anywhere near it!

The surveyor was sorely mistaken, and there was nothing here that could even be mistaken for possible knotweed, so he had no idea what he was talking about.

we got our mortgage back on track and have been living in our home for over 6 mths now!

Coco says:
23 January 2015

It can cost money and major stress. I’ve even been told by one surveyor that colleagues actively look for it. Oh I had 1 report that demanded I get a survey undertaken by a specialist company, then sell you an eradication plan costing £kkks.

Jo Mullett says:
31 May 2016

If a vendor omits information or lies about a property being affected by Japanese knotweed on the TA6 Property Information Form (since 2013) you could be in breach of the Misrepresentation Act 1965. And yes depending on the mortgage company they can and do refuse mortgages if knotweed is on site or put barriers in place requiring surveys, monitoring and insurance backed guarantees or withholding money until controlled


I am afraid this is not an uncommon story. I have had to survey 2 properties where mis-identification was the cause of much stress and sometimes when surveyors know an area is a hotspot for knotweed or if the garden is overgrown they will use the “pro-cautionary principle” but a flat refusal is just bonkers.

Mark says:
21 August 2016

What have you done. I have had a similar experience! How do I get my neighbour to deal with the infestation in their back garden not mine


Unfortunately, it is not illegal to have Japanese Knotweed on your property, but it is illegal if you allow it to spread onto someone else’s property. You can educate your neighbour on the potential structure damage the knotweed can cause.

[Sorry nad1409, we can’t allow you to post links which could be promotional. Please ensure your comments adhere to our community guidelines. Thanks, mods]


Early identification and treatment should be the priority for home owners to contain the weed and costs associated with its eradication or control. Costs for eradicating Japanese Knotweed when it has spread can be considerable and the process can take some time to complete. Lenders are risk averse in this economic climate so it is increasingly likely that where Japanese Knotweed is identified as a problem, remediation will be required. Also, where construction work, such as an extension to a property is planned, soil containing Japanese Knotweed should be completely removed!

Charlie Douglas says:
13 September 2012

If you can bring in a specialist contractor to deal with the Japanese knotweed who offer a guarantee for treatments then a bank should, in most cases, offer a mortgage.

As mentioned in the article, RICS have recently put together a paper on Japanese knotweed to try and encourage banks to lend on properties affected. It is becoming a larger and larger problem, but thankfully, people are becoming aware of it. It was featured on The One Show recently, newspapers regularly have articles. Argyll and Bute Council are creating a Code of Practice for it too.

The more that we do to spread the word about Japanese knotweed the easier it will be to stop it causing problems.


Susie B says:
13 September 2012

Finding Japanese knotweed would definitely put me off buying a house a bit : but then if I ever found it, I would negotiate with the sellers of the house on the house price, and use it to lower my offer. It may be that it would have to be treated in order to get the mortgage, so then I’d just agree with the sellers that I’d buy it once the problem is sorted out. Job done!


My next door neighbour’s garden has been overrun by Japanese knotweed but they don’t appear to mind as they never use their garden.

l only bought the house in December, so there was no sign of this plant but I doubt it would have put me off because, until recently, I’d never heard of Japanese knotweed.

I live in a terrace house, so the neighbours garden is very close to my property. Should I be worried by this stuff as it’s now at least 7 or 8 foot high.

David Knight says:
13 September 2012

There are a number of plants that cause damage to buildings. Budlea is one of the most common, some gardeners call it the butterflies friend but it can self seed in the smallest areas, grows quickly and the root ball can cause large cracks in brickwork.

My boss has been trying to get rid of knotweed at the back of his garden for a number of years, he was told that he would not be able to sell his house because of it. I know he burns it but it keeps growing back. I will tell him to contact the RICS after reading this article.


To richardlondon

Firstly make sure it is Japanese Knotweed in your neighbour’s garden. If their garden is full of it, I’d be really surprised if it hasn’t already made it’s way into your garden. Sometimes dogwood (cornus) can look a little like Japanese knotweed as it has red stems, similar leaves and grows extremely quickly.

Have a look at the Royal Horticultural Society website. It has some great identification tips and eradication advice if it is knotweed.



Hi Adelaide

Thanks for the information and the note about Dogwood. Unfortunately it is definitely Japanese Knotweed. Looks like I’ll be paying my first house-call to my neighbour and delivering some unwanted news.



We have this on a council-owned piece of land next to our front garden. Every year it grows around 10′ long through the railings and we have to chop it back 3 or 4 times each summer so we can get our car off the driveway. We report it to the council every year but they refuse to do anything about it, although I’ve been told that it’s on some sort of restricted plant list that the council are responsible for. I hadn’t heard about the problems with mortgages before. Maybe when we come to sell and can’t get a buyer we should sue the council. The most annoying thing is that we live at the end of a cul-de-sac where nobody ever walks, but if our hedge grows more than about 6″ over the pavement we get a letter from the council telling us it’s causing a nuisance and threatening us with prosecution if we don’t cut it within 2 weeks!


I have just had a bank turn down lending on a property, as the survey company said there was a previously case on the street!! They haven’t even gone to view the property, the bank has flat out refused to lend on the advice of there surveyors.

Very frustrating.. as I don’t even know where the infection was (a neighbour) if it has been dealt with.

I have contacted the council… no record of anything on the street

Contact the environment agency…. only can help if Japanese Knotweed is on the property.

Bank doesn’t know where the outbreak was, and I am trying to contact their surveyors

Mark says:
21 August 2016

Where are you now?

Nigel says:
7 April 2013

We bought an old deserted farmhouse to renovate and the front garden was full of the stuff. My research advised that spraying with Glycophosphate was the most reliable method of eradication – and to never just pull up healthy plants. Initial spraying killed the visible plants, and it took about 5 years to completely eradicate them.

Himalayan balsam is the biggest problem now – thankfully that can safely be pulled up, but care has to be taken when disposing of the plants.


Despite what you may read on many websites, the weedkiller is glyphosate and not Glycophosphate. Simple mistakes like this are often a good way of deciding which advice is worthwhile using.

Best of luck with the balsam bashing.


From the Royal Horticultural Society website:

A note on glyphosate May 2016: After reviewing glyphosate, the European Parliament has given the go ahead to relicense it but proposes disallowing certain uses such as public open space and restricting it to professional use only. The final resolution will be decided by national authorities this summer which may mean the withdrawal of glyphosate-based weedkillers for home gardeners in the UK. Check the RHS website for further updates.

lisa says:
10 May 2013

I think WHICH should really investigate this issue and write a more thorough and informed article about it. There are many different types of treatment i.e. glycophosphate and tordon, etc. and it is important to know what to look for in a reputable company i.e. being a member of Property Care Association, etc. This information may help a consumer who is looking to deal with the problem in a proper way, which ensures they can sell their property on. There are some cowboy companies around and this information would help people to make informed decisions.

It might also be helpful to advise consumer to request that this is looked for in their surveys and what is possible if someone moves into a property to discover it there even if surveyors and bank valuers have missed it or if people have been duped by the previous owners. Again, important information for a WHICH magazine reader.


The PCA came in for a great deal of criticism on a Conversation (search for ‘dodgy damp advice’) about their members’ advice on damp treatment. Some of this was from representatives of companies that are not members PCA, obviously intent on destroying the reputation of PCA. What I did learn was how important it is to try and understand a problem before calling in the professionals.

PCA is a trade organisation and I think its fair to say that trade organisations are primarily there to serve the interests of their members. From the consumer’s point of view, you need to find out what a trade body will do if you are unfortunate enough to have a dispute with one of their members.

As I said before, there is no such thing as ‘glycophosphate’.

Steve says:
14 June 2013

I’m in the process of buying a house which has Knotweed growing right behind the rear garden fence, I’ts about 10 ft high and the land is owned by the local council.The seller told me about the weed and she was quite open about it and said that the council had treated it in the past, but I did not realise that some banks won’t lend because of it. I have contacted the council who say that they will get it treated, but I have put a hold on the transaction. Does anyone know which banks would be willing to lend.

mary says:
9 July 2013

get in touch with your local or any estate agent they will have a list of lenders willing to take on the property with japanese knotwood.

Nigel says:
22 November 2013

My daughter bought a new build house 5 years ago. When moving in, Japanese Knotweed was found 3 feet from the side wall, bottom of garden & on adjacent land. The developer contracted clearance to a specialist, who sprayed with piciloram & repeated 12 months later. After 3 years he issued a certificate of clearance but no extended guarantee.
My daughter has to sell, due to health problems and move into a small apartment. Her estate agent advises that she will have to drop the price to sell!
My question is – can one obtain & pay for insurance say for 20 years? If any one knows a company that does this, I would be grateful to hear as it may satisfy the purchaser & mortgage company. Thanks.


I had a valuer come round today for a remortgage and he said there was Japanese Knotweed growing in the land behind my garden which is owned by National Rail. It is about 7 metres away and he said it will likely result in my flat being rendered worthless and the lender not agreeing to a mortgage. I’ve contacted NR but I also think it’s started growing in the communal garden which adjoins mine.I’ve been here 5 years and I’ve never seen it before now, it’s not in my garden to my knowledge. I’ve told the management company as it’s share of freehold but on top of being extremely worried I don’t know who’s responsible. I was also looking to sell the flat next year but doubt anyone will buy it now



I have a similar issue in that I have knotweed on land around my first floor leasehold flat. I am trying to sell it (after a sale fell through a couple of years ago because of it) but so far no one wants to touch it when they know about the knotweed. Like you, I am struggling to find out who is responsible for treating it – my freeholder said he is treating it himself but that doesn’t provide me with the insurance and treatment plan mortgage lenders want, even with it, some are still refusing mortgages. The knotweed is also in the garden next door so it looks as though it’s come from there, but I was told by a solicitor that because I don’t own the land, I can’t make a claim on them. So I am left with a flat I can’t sell, and no power to do anything about it.


My daughter bought a new build property in 2008 and there was a plant in the side passage which we joked was Japanese Knot Weed – B Hell it turned out to be true. Having done instant research on the web, I contacted “LandTech of Worc,s” whom I put in contact with the developers – they met the cost of treatment with “piciloram” over a three year period – this has been effective. However due to illness my daughter is contemplating selling and the Estate agents were most negative – “it will be difficult to sell and the price will have to be dropped”
LandTech put us in touch with an insurance company which covered the re-damage to the property for 25 years. It did not cover treatment for re-appearance but LandTech agreed to cover this for the same period.

Let me tell you it is a shattering experience for someone who is extremely disabled and ill.

Should you want more feedback, please come back to me.



Previous Message

jodie says:
15 October 2014


what was the name of the insurer? did you manage to sell and did the new owners manage to get a mortgage on it?
I’ve found a property where the neighbouring garden has knotweed (there is a lot of scrubland/woods around the properties). They have a plan in place with a specialist for the next 3 years and one treatment has already happened.
Wondering whether this would affect the mortgagability of the house.


My daughter had mortgage approved ,contracts came in post to exchange valuation done,she rang mortgage company to ask about something and they said sorry mortgage offer cancelled due to this weed,surely they should have been informed before it got to this stage,


Extra to above email the house is a new build soil has been treated and removed a wall and a fence at bottom of garden,the weed isnt even on property

Sue says:
16 June 2015

has anyone been succesful in getting a mortgage offered on a property with JKW with a care plan in place ?


This has all the hallmarks of a racket, but for more dangerous because it has grown into the professions that once looked after people, but now concentrate on their power to ruin people’s lives. A newspaper report said that one person has even killed himself because of knotweed in his garden. (Google “knotweed suicide”) Myths like “Knotweed can grow through concrete” abound (it only grows through cracks — so will grass.)

Members of these professions will slavishly follow rules that makes them money, and the government gets 20% on top, so turns a blind eye. It is a sort of Ponzi scheme in reverse. At someone else commented, the PCA is a trade association, designed to increase the income of trades, not to care for customers’ property, as its name suggests. Obviously if gardeners can get wages running into thousands of pounds (rather than £10 to 20 an hour) they would be foolish (albeit unethical) to take it. Similarly mortgage lenders and associated professions such as conveyance lawyers get more money (+VAT) if house sales fall through. The customers are still there to fleece for the next one. The more stressful house sales become, the more money they make, It doesn’t matter that people’s health is damaged, just as long as the fees (+VAT) keep rolling in.

There must be (ethically rather then just legally) honest people in the professions, and hopefully Which? can point them out for subscribers, but like trying to find some indigenous plants in an English garden, it could be very difficult.


I smell a racket too here. I had a surveyor come round yesterday for a valuation on behalf of Barclays/Woolwich, he asked what was behind the house. I told him it was a stream, I told him the name and he said ‘Ah that one, it’s full of Japanese Knotweed’, then he started to actively look for any growths in our garden and moving about plant pots. When he found ONE, it was almost with some satisfaction, he excalimed ‘Found it!!!!’.

Have just read the report this morning which he has submitted to Barclays/Woolwich stating,

“Japanese Knotweed is present within 7 metres of habitable space. The property is not considered suitable securityuntil remedial work is undertaken by a PCA registered company covered by a minimum 10 year insurance backed guarantee which is property specific and fully transferable,”

This is really frustrating as it has taken nearly 2 years to get to this stage of the buying process for me – I shall nervously wait to hear what Barclays/Woolwich have to say. Should state I am only looking for a 50% LTV.


This link from the Rockefeller University in the USA has been brought to my attention. It says is all really:


It seems that all this is just a legalised protection racket. This link from the Telegraph shows how far these people will go:

The plant of hate in Arizona this week is Tamarisk:


Another “plant of hate”, in the USA at least, is Kudzu, also from Japan and east Asia.


However it has its uses as well, as the link explains. It is very good at nitrogen fixation, which means it is a plant that adds fertiliser to the soil rather than the other way round, and can be used as animal feedstock.

The ease with which it propagates could well find that it has a use for the mortgage profession as well, in order to raise the stress for those needing a loan. It will also help them to enable specialist gardeners to charge hundreds of times their usual wages for its removal. It will benefit the government’s VAT take on services that in reality add very little value.


I have had a similar issue with NatWest with knot weed found on a neighboring property. The valuer classified it as a category 2 per RICS guidelines which per Barclays/Woolwich lending criteria needs no further action but NatWest requires an investigation which of course runs into the thousands of pounds even though the specialist firm can do exactly the same treatment for a few hundred pounds if the Bank was not involved. I fully accept Banks should be careful with their lending but there must be a balance with being fair to their customers needs too. Is Which planning on doing anything ?


6 months ago my partner and I bought a property that has been surveyed as having JKW in the front garden. We have an insurance backed treatment program in place (paid for by the vendor) and the only people who would (and have) lend to us were Halifax. We’d started off with HSBC so it’s cost us two lots of fees / valuations etc. AND, the twist in the tail is that it isn’t knotweed!!! So we’re now waiting for confirmation of that fact, and then see if there’s anything we can do to claim back our costs from the knotweed firm which were in fact completely unnecessary!!!!


We have found our dream home and after putting in an offer and getting it accepted the estate agent casually said ‘did we mention the JK?’ We are devastated and not sure whether to go ahead with the purchase or not, indeed it may not be in our hands should the lenders refuse to give us a mortgage.

The Estate agents have sent us copies of the treatment plan, paid for by the vendor and they insist this is nothing to worry about! We called the company treating the JK and they said that although it’s in 3 separate places, it’s a small amount and will be straightforward to treat.

Would you buy the house? Put in a lower offer? If so how low? Or run a mile?


Hi KD, we have some advice on property haggling here (http://www.which.co.uk/money/mortgages-and-property/guides/buying-a-house/making-an-offer-on-a-house-or-flat/) which may be of some use to you.

It’s probably worth seeking a quote from specialist in Japanese Knotweed to help you in your decision and negotiations.


Hello KD – I would withdraw the offer, get the sellers to carry out the treatment plan at their expense, and possibly make a new offer at 10% below the original asking price [subject to survey and mortgage approval] if you still felt comfortable with buying the house. If you have already paid [or agreed to pay] a mortgage arrangement fee see if you can get the sellers to reimburse it. Also it would be advisable to check the insurability of the property and whether or not the premium would be loaded. There is no doubt that the estate agent should have brought the presence of the Japanese Knotweed to the attention of prospective purchasers since they were clearly aware of it. An interesting question to them would be what part it played in their valuation of the property.

Can you be sure that the treatment of the existing Japanese Knotweed will be permanent and that a further outcrop might not appear? – see if there is any in neighbouring gardens or areas from which it could spread. It says in the Intro that it needs repeated treatment over several years – are you content with that? And do you mind the property being ‘blighted’ for such a period? Disappointing though it might be, don’t be afraid to walk away from the purchase. If you do receive satisfactory assurances and acceptance of a revised offer you can still withdraw right up to exchange of contracts [although you would be liable for any legal costs incurred on your side]. Don’t be worried about another prospective purchaser coming in with a higher bid; the chances are that the estate agent will have to be much more upfront about the existence of the JK if the property goes back on the market and that will inhibit stronger interest. Sellers can’t honestly cover-up the presence of JK in a house sale because it is specifically declarable in the Property Information Form and therefore part of the Contract; you would be bound by that too if you proceeded to purchase and subsequently wished to sell. Even at a lower price a ‘dream home’ might have an irradicable blemish and on balance you might be better off leaving it to someone else to worry about while you pursue your quest for a nice new home – they do exist.


I’m probably going to get throttled here
We have a huge garden of JK growing on the next property down the lane………………It does not belong to us
It became so big that the silage trailers were carrying it up our way……………..I have successfully gotten rid of it on three occasions but to say its difficult is an understatement………….
The railways and Roads authorities have a herbicide that they use that we cannot get……………unfortunately………..
I cannot understand when such an invasive species is known about why our great and good do not legislate that the owners have to eradicate the problem……………….Why can this plant be allowed to simply grow where it pleases………………..

Tatter says:
23 May 2016

I’ve just had a buyer pull out because Japanese Knotweed is growing 80 metres away from my property!

The area it is growing in is a communal area managed by the residents managing agents and has spread from land owned by Northern Rail.

I’ve had my house on the market for two years and was about to exchange contracts, I’m absolutely livid!

As soon as Japanese Knotweed is mentioned people run a mile, which is ridiculous as this IS treatable and often not the problem of the buyer or lender.

alison says:
2 June 2016

im looking to purchase a house with JKW next door. The gentleman who owns the property next door is very old and is really unable to do anything with it. We wont be looking for a mortgage as we will be cash buyers, any advice ? My husband says definitely not, but I really want the house ? The estate agents informed us of it, but im wondering how bad can it really be ? Ive looked at pics etc, and read everything on here, but still unsure. House is a bargain anyway, and im thinking I could get it lower because of this. Any advice gratefully received


Hello Alison. A nice dilemma.

Someone will buy that house even if you don’t. The price might have to drop a bit but it will eventually sell, knotweed or not. Most people would probably say “leave it alone, there’s bound to be another house you’ll like as much on the market before too long”, but if I were in your shoes I would go for it – on the right terms. The sellers obviously know that they are sitting on a depreciating asset and must be expecting a reduced offer. However much of a bargain it seems to be at the asking price I would put in an offer at least ten percent lower and see the reaction. You can withdraw it and go lower if your offer is snapped up without demur. Don’t be frightened – they need you more than you need them [make sure you don’t overdo your liking of the house]. But you must go into this on the expectation that you will have to fork out for the removal of the JKW. Any offer is still subject to contract and can be withdrawn right up to that point [although you will be liable for your own legal and other expenses] so you should use the time after acceptance of your offer to talk to the man next door and see how amenable he would be to your taking full responsibility for eradication of the knotweed. A legal agreement with him might be helpful, entered into in a conciliatory manner with a view to being cooperative on both sides throughout. Some would suggest that you try to put a charge on his property for the expense of doing that but you need to be careful how hard you push, and anyway, if you get the right price with the seller, why upset someone who could be the way out of your dilemma? Of course, he might have no cares about the future resale value of his property, resent any interference, and be disinclined to go forward with you on that basis, in which case it probably would be better to walk away because JKW can, and will, only get worse and the surveyors’, valuers’and lenders’ antipathy to it will only harden.

I certainly think it would pay you to get a professional estimate of the cost of destroying your prospective neighbour’s knotweed and I think it would be reasonable to expect the sellers to deal with their neighbour along those lines in the first instance. If they won’t or can’t you might be able to persuade him. A professional report on the extent of the problem and the cost of a treatment plan will help both yourselves and the sellers in negotiating an acceptable price for the property. Please don’t get so carried way with desire for the property that you throw caution to the winds; there are plenty of houses on the market, nearly all of them without this problem. But if you can get the house you like, at the right price, with a solution to the problem within your overall budget, and end up with an amenable and grateful neighbour it is worth going for. If your husband still disagrees I think you should give him the benefit of the doubt and let this one go.

Makes the referendum question seem easy, doesn’t it?

Carl says:
7 July 2016

Just had a valuer come to value our property but because knotweed was found within 5 metres of my property , but not IN my property , they refused to proceed any further. I’ve been living here for 3 years with recent signs of it in my area and am now worried I’ll never be able to sell my house due to this problem. I don’t have 3/4/5 years to wait to eradicate it, I need to move on with my life , it’s absolutely appalling.


As long as you have a guarantee showing the knotweed is being treated/removed, it shouldn’t be a problem.

Diane says:
13 July 2016

My partner and I are selling both of our houses and buying one together. We currently live on the next street to each other. My survey was fine but his has just come back stating JKW has been found within 20 meters. The only place we can think it might be is on some derelict land at the top of our streets; but then it would also be within 20m of my house too. It makes no sense why it would be picked up on one survey but not the other. We now have a very nervous wait as we have had an offer accepted on our dream home.


I can tell you from a first-hand experience…knotweed can and does kill a mortgage application. For help and advice, I would recommend contacting a specialist Japanese Knotweed removal company.