Sell a house with Japanese knotweed fast — no treatment plan needed.
The survey found it, the lender won't lend without a management plan and an insurance-backed guarantee, and the buyer has walked. We buy the house exactly as it stands, knotweed and all. One cash offer, no specialist contractor to hire first — anywhere in England.
Treat, then sell via an agent
As it stands, to us
It's one plant, but lenders treat it as a risk to the whole house.
Japanese knotweed is a fast-spreading invasive plant. Its roots can push through drains, boundary walls and tarmac, and it is expensive to remove, so a surveyor who sees it will flag it and a lender will usually want proof it's under control before lending. A buyer needing a mortgage then has to wait for a management plan and a guarantee that can take months, and many lose heart or lose the lender. A cash buyer isn't borrowing, so none of that applies.
The survey flags it
A surveyor who spots knotweed, or a plant that might be, will record it, and the buyer's lender is told. Knotweed is one of the most common surprises on a survey, and it can appear in a neighbouring garden or on adjacent land.
The lender wants a plan and a guarantee
Most lenders want a professional management plan from a specialist and an insurance-backed guarantee. Some refuse outright if it's within a few metres of the house, and others ask for more evidence before they'll lend a penny.
Treatment takes months, even years
Herbicide programmes run across several growing seasons, and excavation is costly and disruptive. Even once treatment starts, the guarantee is usually conditional on the work being completed and monitored.
You have to answer the question honestly
The seller's property information form asks directly whether the property is affected. A false answer can lead to a claim for misrepresentation later, so hiding it isn't an option, and a buyer who learns about it late is likely to walk.
We take the house as it is. You don't treat, certify or reassure anyone.
Selling a house with knotweed to us is a normal sale of the house, plant included. Here's what happens to each piece, so you know exactly what you're agreeing to before we make an offer.
The knotweed
Stays exactly as it is. We don't ask you to treat it, dig it out or commission a survey first. The cost of dealing with it is priced into our offer, not billed to you.
The treatment plan and guarantee
Ours to arrange after completion if we need one. You don't need a specialist's management plan or an insurance-backed guarantee to sell to us, though any you already have help.
The lender's refusal
Irrelevant to us. We're not borrowing against the house, so a lender's decline or a requirement for a guarantee changes nothing about whether we can buy.
The disclosure
Be straight about it on the property information form. We'll handle the paperwork honestly alongside you, and being open protects you from a misrepresentation claim later.
Your existing mortgage
If there's one on the house, it's repaid from the proceeds at completion. Send us your lender's redemption figure and we'll check the offer covers it before you decide anything.
The paperwork
Any survey, specialist report, management plan, guarantee or quote you've already got. If a piece is missing we'll tell you whether it matters before we offer.
From first message to completion, without hiring a contractor
The same four steps we use for every purchase, with an inspection in place of a long wait.
Tell us about the house and the knotweed
Postcode, type, where the plant is and what the survey said. Photos help. The form takes a minute; WhatsApp works too.
Get a firm cash offer
We assess the house, the infestation and the likely cost of dealing with it, and come back with a figure you can rely on — usually within the hour. No obligation.
We inspect and instruct
We arrange a quick inspection and instruct and pay for solicitors on both sides. You send whatever paperwork you have; we chase the rest.
Complete
Any mortgage repaid, the money lands on a date that suits you. Typically 14 days from acceptance.
What helps us make an offer
- The address and a few photos of the plant
- Where it is: your garden, a neighbour's or adjoining land
- How close it is to the house, drains and boundary walls
- The survey or specialist report, if you have one
- Any treatment plan, quote or guarantee already arranged
- What the buyer's lender said
- Any mortgage on the property and the redemption figure
- The date you'd like to complete by
Treat first vs. sell as it stands: a typical house with knotweed
Take a 3-bed semi worth £200,000 without the plant, with knotweed found in the back garden about five metres from the rear wall — the kind of house we're asked about every week in Lincoln, Carlisle and Grimsby. A buyer's lender declined without a management plan and guarantee.
| 3-bed semi with knotweed | Treat first, then sell | Sell as it stands to us |
|---|---|---|
| Time before it can be marketed | Typically 2–3 months for a survey, a management plan and a guarantee — longer if the plant is close to the house | None — offer the day you ask |
| Sale price | £184,000 (92% of the value without knotweed, after a discount for its history) | £156,000 cash offer (fixed) |
| Treatment plan & guarantee | −£4,000 (estimated; larger infestations cost far more) | £0 |
| Agent, conveyancing & EPC | −£7,100 | £0 — we pay both sides' solicitors |
| Mortgage, council tax & insurance while waiting | −£4,200 (about 7 months) | −£150 (14 days) |
| Will lenders lend afterwards? | Often, with a guarantee, but not all — some still refuse | Doesn't matter — no lender |
| Chance it falls through | Roughly 1 in 4 once it's on the market | None — no chain, no lender |
| Time to money | 9–12 months, if it completes first time | About 14 days |
| Net in your pocket | ≈ £168,700 | ≈ £155,850 |
Worked example, not a valuation. Treating first and selling through an agent can leave you with more — here by roughly £12,850 — if the infestation is small, a guarantee satisfies the buyer's lender and the sale completes first time. It also means paying a specialist before you meet a buyer, waiting most of a year, and accepting that some lenders still refuse a treated property. If the infestation is large, close to the house, or you can't wait, selling as it stands buys you a date and a certain number. Your own figures are in the comparator at the top of the page.
The places where knotweed is most often found on a survey
Knotweed thrives on riverbanks, railway embankments, old industrial land and neglected gardens, which describes a lot of the towns we buy in. Each page below has the local detail: what a house there is worth and what puts lenders off.
Somewhere else? We buy houses with knotweed anywhere in England. Start from the county: Cumbria · Lincolnshire · or just send the postcode.
Selling a house with Japanese knotweed: what to know before you list it
If you're searching for how to sell a house with Japanese knotweed, or what to do when a lender won't lend because of knotweed, the first thing to know is that it doesn't make the house unsellable. It makes it harder to sell to someone who needs a mortgage, because lenders treat it as a risk to the value of the property. What decides how hard it is depends on how close it is to the house, how big the infestation is, and whether it's on your land or a neighbour's.
Confirm it really is knotweed
Plenty of surveyors flag “suspected knotweed” from a distance, and plenty of plants are mistaken for it. A specialist survey, usually a few hundred pounds, confirms what the plant is, how far it has spread and how close it is to the house and boundaries. Many lenders accept a specialist's report with a management plan, so get one before you decide anything.
Be honest on the seller's form
The standard seller's property information form asks whether the property is affected by Japanese knotweed. You must answer truthfully, including where you only suspect it. A false answer can lead to a claim for misrepresentation after the sale, so don't paper over it. Telling the truth early, with a report and a plan, also gives buyers confidence, because many of them have walked away from houses where it came out late.
What lenders look for
Most lenders want a professional management plan from a specialist, backed by an insurance-backed guarantee that covers the cost of remedial work if it returns. They look hard at how close the plant is to the house: within a few metres is the most serious. Some lenders refuse where it's on a neighbouring property, and others won't lend at all if the plant is close to or inside the house. Policies differ, so one lender may refuse what another accepts.
What treatment involves
The two common approaches are a herbicide programme, which usually runs over several growing seasons with monitoring, and excavation, which removes the roots but is more disruptive and expensive. A management plan sets out which approach, how long and what it costs, and a guarantee sits behind it. Costs vary from a few thousand pounds for a small area to far more for a large infestation or one close to foundations, so get quotes before you commit.
If the knotweed is on a neighbour's land
You can have a problem even if the plant isn't yours. Knotweed spreading onto your land from next door can reduce the value and block a mortgage. Your neighbour may be responsible for stopping it spreading, and in some cases you may have a claim against them, but pursuing one takes time and advice. A cash buyer can take the house as it stands while you decide whether to pursue it.
Why cash makes it easier
A mortgage lender needs the plant managed and guaranteed before it will lend, which takes months and still isn't certain. A cash buyer for a house with knotweed isn't borrowing against it, so none of that applies: we can take an untreated infestation, a plant close to the house or a neighbour's problem, and still complete in a fortnight.
What it's worth
Honestly: less than the same house without knotweed. We're buying a house with a plant that needs managing, and taking on the cost, the time and the risk. Our offers on houses with knotweed usually land at around 70–85% of the value without it, depending on size and distance, with every fee paid by us. Against that, treating first costs money up front, takes many months, and still leaves a one-in-four chance the buyer's lender backs out — which is why the net figures in the comparator at the top of this page are closer than the headline percentages suggest. If you'd like to see the same maths for your own house, ask for a figure; it takes a minute and costs nothing.
Knotweed is one of several reasons a lender may refuse a house. If yours has others too, our unmortgageable house page covers the wider picture.