Japanese Knotweed Mortgages

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The mortgage experts for those looking to buy a house or flat with Japanese knotweed near the property

13/05/2026

Japanese Knotweed and Mortgage Risks: A Case in Lancashire

Referred to us by a Japanese Knotweed survey & treatment specialist who found us online, a couple living in the Bolton area in Lancashire were trying to buy a house. They were using a different mortgage adviser, but the mortgage lender declined the application due to the presence of Japanese Knotweed in the garden. I was asked if I could help.

The house they were looking to buy a house that had an infestation is in the front garden, within a hedgerow. The seller had indicated that the hedge had been periodically cut back & had (infrequently) been treated in the past with Roundup, as part of general garden maintenance although there was significant regrowth.

A 5-year plan was put in place for a herbicide treatment/monitoring plan consisting of up to 2 visits per year over a 3-year period for the purpose of treating the affected areas with the appropriate herbicide and monitoring progress. On completion of the treatment/monitoring plan the area will be inspected annually for a further 2 years with any regrowth subsequently retreated.

The application was not straight forward because in addition to their being Japanese knotweed in the front garden, the house was a few yards from a disused coal mine shaft and the clients’ credit history was not great either.

We did manage to find a lender who could help, and the couple moved in 2 months later.

11/03/2026

Mortgage Approved Despite Japanese Knotweed: A Real Story from Southbourne

Rebecca from Southbourne called me after her mortgage was declined at the last minute—just before exchanging contracts on a bungalow. The issue? Japanese knotweed had previously been present on the property.

The knotweed had already been treated and was close to the house. Rebecca had been advised that full removal via excavation was required, so they paid for the work, believing it would satisfy the lender. Unfortunately, even with a professional report, treatment plan, and insurance-backed guarantee, the lender still refused to proceed.

In truth, the excavation wasn’t necessary. Herbicidal treatment by a qualified specialist would have been enough in many cases—saving time and money.

Luckily, Rebecca’s mum had heard me speak on Radio Dorset and told her to contact me. I found a specialist mortgage lender who accepted the treatment plan in place and agreed to lend. The purchase went through, and the family are now happily moved in.
If you're dealing with mortgage issues because of Japanese knotweed, you’re not alone—and you do have options.

Get in touch today for expert advice and access to lenders who understand these situations.

Your home may be repossessed if you do not keep up repayments on your mortgage.

15/12/2025

Got Knotweed Next Door? Here's What RICS Category D Mean

We’ve talked about Categories A to C—now let’s look at RICS Category D, which covers Japanese Knotweed growing on neighbouring land, not on your property.

Even if knotweed isn’t inside your boundary, lenders and surveyors still pay attention. That’s because there’s a chance it could spread—especially if it’s close by and not being managed.

The good news? Category D is considered low risk. In most cases, the impact on your property’s value is small. But if the knotweed next door is extensive or unmanaged, it could raise questions—maybe even legal concerns. Some lenders might hesitate if the infestation looks severe.

You can’t force your neighbour to remove or treat it, which can be frustrating. But since it’s out of your hands, most lenders won’t expect you to fix it.

If you’re in this situation, don’t panic. It’s usually manageable. Just keep an eye on the growth and, if needed, speak to a knotweed specialist for advice. Being informed is your best defence—and can save a lot of stress during a sale or mortgage application.

01/12/2025

Mortgage for a Property with Japanese Knotweed – Case Study

Securing a mortgage on a house affected by Japanese knotweed is tricky—but not impossible. I recently helped a client buying a property in Haslemere where knotweed was found 10m from the house, within the boundary.

Neither the client nor I knew of its presence when applying. It only surfaced during a structural survey. The case was already complex due to self-employed income and finding a lender offering sufficient funds.

A treatment plan was in place, but the lender wanted proof of treatment already started. Since knotweed is dormant in winter, spraying in November (when it was arranged) is ineffective. However, I noticed the report mentioned past treatment and no new growth.

After investigating, I uncovered that the local council had treated the area previously. A surveyor confirmed this and kindly provided a written report, which I submitted to the lender. Thanks to this evidence, an exception was made.

I specialise in mortgages for properties with Japanese knotweed and complex lending situations. If you’re buying or selling such a property, I can help secure the mortgage you need.

Your home may be repossessed if you do not keep up repayments on your mortgage.

17/11/2025

Knotweed Nearby but Under Control? Here's What RICS Category C Means

Last time we looked at RICS Category B. This time we take a look at RICS Category C.

If Japanese Knotweed has been found on your property but isn’t causing any damage, it likely falls under RICS Category C. This category means there’s an infestation within your boundary, but it’s not affecting your home’s structure or limiting access to outdoor space. Sounds reassuring—and it is! In most cases, this is seen as a low to moderate risk, and the impact on property value is usually modest.

That said, most mortgage lenders will want a proper treatment plan in place. This means hiring a qualified specialist, usually a PCA-approved contractor, to assess the site and recommend the best course of action. A long-term Knotweed Management Plan, backed by a 5 or 10-year insurance guarantee (depending on the lender), is often required to keep lenders and buyers happy. Some lenders will only consider lending on RICS Category C or D.

It’s also worth noting: if the knotweed is growing within 3 metres of a building or boundary, it can raise more concern, even in Category C. That’s why early action is key.

So, if you’ve got knotweed but no visible damage—don’t panic. With the right plan and professional support, it’s totally manageable, and you can move forward with confidence.

03/11/2025

Japanese Knotweed and Mortgage Risks: A Case in Waterlooville, Hampshire

One of the first properties I assessed with a potential Japanese Knotweed problem was a new-build home in Waterlooville, Hampshire. Knotweed was found along the northern boundary and in the neighbouring school field, covering around 100 square metres.

A specialist report confirmed the school site was under treatment, but signs of regrowth and dormant crowns raised concerns for the mortgage lender’s valuer, who needed assurance about long-term risk. To progress, I liaised with the estate agent, builder, school, treatment company and solicitors. The valuer required written evidence that the school’s land would remain under a continuing knotweed management plan to prevent spread back into the garden and towards the house.

Even with a 10-year Japanese Knotweed guarantee, protection is limited if adjoining land is untreated. Once a plan ends, knotweed can quickly re-establish from neighbouring sites.

This case involved significant back-and-forth, but by understanding lender requirements, assessing the risk early, and coordinating with all parties, the purchase concluded and my clients moved in. Not all lenders would have approved, underlining why early identification and professional knotweed advice are vital in property transactions.

06/10/2025

Japanese Knotweed Taking Over Your Garden? Here’s What RICS Category B Means

Last week we looked at RICS Category A. This week we are looking at RICS Category B.

If Japanese Knotweed is starting to take over your outdoor space but hasn’t yet caused structural damage, it may be classed as RICS Category B.

This category applies when knotweed is within the property boundary and is starting to affect how you use your garden or outside space. It might be growing quickly, blocking access, or spreading near paths, fences, or patios. While it hasn’t damaged your home, it’s clearly a problem—and lenders will want to see action.

Most mortgage lenders will require a Knotweed Management Plan carried out by a PCA-registered contractor. This plan should include a long-term treatment programme and a 5 or 10-year insurance-backed guarantee (depending on the lender) to give lenders and buyers peace of mind. Some mortgage lenders may keep some money back until the treatment plan has been paid for (known as a retention). Other lenders may not lend on RICS Category B.

The presence of knotweed in this category can impact your property’s value, depending on how severe the spread is and how early treatment begins. That’s why it’s important to act quickly—the sooner it’s assessed, the better your options.

If you think your property falls into Category B, don’t wait. Get a specialist in, start treatment, and you’ll be in a much stronger position when it’s time to sell, remortgage, or just enjoy your garden again.

29/09/2025

Buying a Property with Japanese Knotweed Damage? Here’s What RICS Category A Means for You

Over the next few weeks, we’ll be looking at the 4 different RICS Categories from A to D. This week we start with RICS Category A.

If you're house hunting and come across a property with Japanese Knotweed causing visible damage, it's likely classed as RICS Category A—the most serious level of infestation.

This means the knotweed isn’t just nearby—it’s already causing harm, like cracks in walls, damage to drains, patios, or outbuildings. It’s a major red flag for mortgage lenders and can seriously affect the property’s value.

Some lenders won’t lend at all on Category A properties. Others may consider it—but only if there’s a professional Knotweed Management Plan in place from a PCA-approved contractor, along with a 5 or 10-year insurance-backed guarantee, depending on lender requirements. Some lenders will not consider lending on a property with RICS Category A.

Treatment can be expensive and take years, so it’s important to go in with your eyes open. If you’re considering a home affected by Category A knotweed, make sure:

✅ A full survey has been done
✅ You’ve seen the treatment plan and guarantee
✅ You speak to a mortgage adviser who knows which lenders can help

Buying a home with Category A knotweed isn’t impossible—but it needs extra care, expert input, and the right plan in place to protect your investment.

Address

10 Milton Gate 114-116 Old Milton Road
New Milton
BH256EB

Telephone

+447748677797

Website

http://www.japaneseknotweedmortgages.co.uk/

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