Do you cover the whole of London?+
Yes — we work across every London postcode, including W, SW and NW and the surrounding area. Most London jobs receive a same-week site visit.
How much does Japanese knotweed treatment cost in London?+
Pricing depends on the size of the stand, proximity to buildings and whether you need treatment, excavation or both. Typical London herbicide programmes start from £1,500 + VAT (most domestic jobs land in the £1,500–£4,500 range), with fixed-fee surveys from £295 + VAT and excavation projects from £4,000 + VAT. We always quote in writing before any work begins.
Will I need a knotweed report to sell or remortgage my London property?+
If knotweed is impacting amenity space or causing damage to structures (tarmac, sheds, fencelines, outbuildings), most UK lenders will ask for a management plan aligned to current RICS knotweed guidance and, where eligible, an insurance-backed guarantee (IBG). Requirements vary between lenders in Greater London, and the lender and its surveyor make the final decision.
Why is knotweed so common in London?+
London's combination of Victorian housing density, intense redevelopment, river corridors and disused rail land means almost any property within a few hundred metres of those features should be screened before purchase.
How quickly can you survey a property in London?+
For London enquiries we typically attend within 3–5 working days, and often the same week for urgent sales. Send a photo to Info@knotweed-wales.com or call 07582 869979 for free identification first.
Do you offer insurance-backed guarantees in London?+
Yes. Every treatment programme we deliver in London can be backed by a 5 or 10-year IBG underwritten by an FCA-regulated provider, accepted by Halifax, Nationwide, Santander, Barclays, NatWest and other major UK lenders.
How long does Japanese knotweed treatment take in London?+
A standard herbicide programme in London runs across 3–5 growing seasons — typically two to three foliar applications a year, timed for late-summer translocation, plus annual monitoring through the IBG period. Where a sale, build or extension can't wait, full excavation in London is normally completed in 1–3 weeks depending on volume, access and disposal route. Either way, you receive written visit reports and a closing certificate for the file.
Which mortgage lenders will accept a knotweed-affected property in London?+
Provided we have an active management plan and a 5 or 10-year IBG in place, valuations across Greater London are routinely accepted by Halifax, Nationwide, Santander, Barclays, NatWest, HSBC and — for Welsh-affected addresses — Principality. A small number of specialist or short-term lenders are stricter; we'll flag yours up front if it is.
Can I sell my London house with Japanese knotweed on the property?+
Yes. London sales complete every week with knotweed disclosed on the TA6 — the key is having a written survey, an active management plan and a transferable IBG ready for the buyer's solicitor and lender. We work directly with Greater London conveyancers to keep exchange on track and assign the IBG to the new owner at completion at no extra cost.
Is excavation or herbicide treatment better for London properties?+
It depends on the site. Across London we recommend a multi-season herbicide programme for established garden infestations, terraced gardens and amenity space — it's the most cost-effective route and fully lender-accepted. Excavation is the right call when you need to build, extend, sell to a cash-tight timeline, or where the stand is right against a structure. Hotspot areas such as Hounslow often see a mix of both depending on plot type.
My neighbour's knotweed is encroaching into my London garden — what should I do?+
Encroachment cases in London now sit firmly in the civil-nuisance bracket since the Williams v Network Rail ruling. Start by photographing the boundary with dated images, send the neighbour a written notification, and book an independent boundary survey so you have an evidenced report behind any formal complaint or insurance claim. We deliver evidence-grade surveys across London and the wider Greater London on the same paperwork your solicitor will need.
Will an insurance-backed guarantee transfer to the new owner of my London property?+
Yes — every IBG we issue on a London job is fully assignable to the buyer at completion for the remainder of the term, at no extra cost. The assignment paperwork, the original management plan and the visit record go straight into the conveyancing pack, which is exactly what the buyer's lender and panel surveyor want to see.
What's the full treatment timeline for a London property — survey to sale-ready?+
Here's the typical run on a London job. Week 1: PCA-trained site survey across your W (or wider W, SW and NW and the surrounding area) plot — boundary walk, photographs, GPS-pinned stand mapping and rhizome-depth estimate. Week 2: written RICS-aligned Knotweed Management Plan, fixed quote and IBG quotation issued to you and your solicitor. Weeks 3–4: contract signed, IBG underwritten and policy document issued — at this point the property is sale-ready and mortgageable. You do NOT need to wait for the herbicide programme to complete before buying or selling — once the IBG is in your hand, lenders treat the property as compliant. Season 1 (late June–September): first foliar or stem-injection application, timed for late-summer translocation to the rhizome. Seasons 2–5: one to two annual visits with photographic records and a written report after each. Year 5 (or year 10 for the longer cover): final inspection and closing certificate. Throughout, the IBG transfers with the property at any point you sell, so your buyer inherits the same lender-accepted protection.
Is my London property sale-ready when the IBG is issued or only after RVD approval?+
Your London property is sale-ready and mortgageable the moment the IBG policy document is issued — typically within three to four weeks of survey. You do NOT need to wait for RVD (RICS Verification of Data) approval, which only happens at the end of the treatment programme (year 5 or later) to confirm final eradication. Many lenders will consider an active IBG and management plan from day one, but requirements vary and the lender and its surveyor make the final decision. The only common lender question is whether the IBG is transferable (yes — it assigns to the buyer at completion). Your Greater London conveyancer handles this by slotting the IBG certificate, the original RICS-aligned management plan and the assignment form directly into the conveyancing pack, so the buyer's solicitor and panel surveyor see everything they need before exchange.
Is the IBG certificate accepted by London solicitors and surveyors at completion?+
Yes. The IBG policy document is issued at the start of the treatment programme — typically within three to four weeks of survey — and can be relied on by solicitors and panel surveyors at completion from day one, subject to the individual lender's requirements. Your Greater London conveyancer includes the original IBG certificate, the RICS-aligned management plan and the assignment form in the conveyancing pack. The buyer's lender and surveyor see a live, FCA-regulated guarantee covering the property for the remainder of the term, which is exactly what they need to sign off the mortgage. The IBG does not wait until treatment finishes; it is active and transferable from the moment it is issued.
Does the IBG automatically transfer to the buyer of my London property at completion?+
Yes — the IBG transfers automatically to the buyer at completion with no additional cost or extra steps for you. Once your Greater London conveyancer submits the assignment notice to the underwriter, the guarantee continues uninterrupted for the remainder of the term under the new owner's name. The buyer's solicitor and lender see a live, lender-accepted policy from day one, so the sale proceeds exactly as it would without knotweed. You do not need to wait until treatment finishes or pay any transfer fee.
Are there any transfer or assignment fees when the IBG changes ownership at London completion?+
No — there are no transfer fees, assignment fees or administration charges when the IBG changes ownership at completion. The assignment is handled by your Greater London conveyancer as part of the standard conveyancing pack at no extra cost. The underwriter processes the change of policyholder free of charge, and the guarantee continues uninterrupted for the remaining term under the new owner's name. This is one of the key reasons UK lenders accept the IBG as sale-ready security from the day it is issued.
Can I split the cost of knotweed treatment in London into instalments?+
Yes — for London homeowners who'd rather not pay the full programme upfront, we can spread the cost into manageable monthly instalments over up to two years. Most multi-season herbicide plans and many excavation projects qualify, the IBG is still issued at the start of the programme (so the property is sale-ready from day one), and there are no early-settlement penalties if you'd like to clear the balance sooner. Ask your surveyor for a written payment schedule alongside the quote.
