Japanese Knotweed Elimination

⟶ Services

Eight ways we
make it go away.

From a free photo ID through to a 10-year insurance-backed guarantee — every service priced clearly, scheduled honestly, and signed off by the same qualified hands that do the work.

Quick answer

Which knotweed service do I actually need?

Start with a survey: it identifies the plant, maps the stand and states what it affects. If the ground can stay as it is, a 3–5 season herbicide programme is usually the proportionate answer. If the ground has to be built on or sold immediately, excavation and removal is the faster route. Everything else follows from those two facts.

Conditions: Method, scope, monitoring and any guarantee eligibility depend on the plant, access, site constraints and your timescale, and are confirmed in writing after a survey.

Next step: Send a photo and postcode for a free ID, or call 07582 869979.

01

Photo in. Answer back.

Free identification

Send a clear shot of the leaf, the stem and the wider stand. A qualified surveyor will confirm whether you're looking at Reynoutria japonica, a hybrid, or one of the common look-alikes — bindweed, Russian vine, dogwood, bamboo. Same-day response in working hours.

02

From £295 + VAT

RICS-aligned survey

On-site mapping of every visible stand, an estimate of rhizome depth, photographs, a marked plan and a written Knotweed Management Plan that satisfies TA6, your solicitor and your lender. Turned around within 5 working days.

03

From £1,500 + VAT · 3–5 seasons

Herbicide treatment programme

Glyphosate-based foliar spray and stem injection, timed to the plant's late-season translocation cycle so the kill reaches the rhizome. Annual monitoring visits, photographic records and a closing report. Compatible with most boundary, garden and amenity settings.

04

From £4,000 + VAT

Full excavation

When you can't wait for a multi-year programme, we lift the rhizome whole. Off-site disposal under EA / NRW duty of care, or — for larger plots — root-barrier-encapsulated on-site burial at depth. Suited to development, sale, or extension projects.

05

Brownfield & development

On-site burial & bunding

Where excavation is the answer but volumes are large, we encapsulate material in geotextile membrane and bury at depth, or stockpile in treatment bunds for staged remediation. Cost-controlled, programme-aware, fully documented for the discharge of planning conditions.

06

5 or 10 years

Insurance-backed guarantee

Where the survey and treatment plan meet the insurer's criteria, the programme can be backed by an FCA-regulated insurance-backed guarantee, transferable to a buyer on sale at no extra cost. Lender requirements vary — the lender and its surveyor make the final decision, and terms and exclusions are confirmed in writing.

07

Quiet rescues, mid-sale

Mortgage & solicitor liaison

Sale falling through because of a knotweed flag? We deal directly with your solicitor and the lender's panel surveyor to get the plan, the IBG and the disclosure paperwork to the right desk in the right order — usually inside a week.

08

Independent

Re-inspections & second opinions

If another firm has quoted excavation when treatment would do, or treatment when excavation is the only safe answer, we'll give you an honest written second opinion before you commit.

⟶ Species-by-species

What we do for each of the six.

Same workflow every time — identify, survey, treat or remove, document. The method changes per plant; the paperwork doesn't.

  • Japanese Knotweed

    Schedule 9

    Survey: on-site ID, mapping and photographic record, written into a management plan.

    Treat / remove: RICS-aligned survey, multi-season stem-injection or foliar herbicide programme, or full excavation with off-site disposal. 5–10 yr IBG.

    Document: visit reports, before/after photos and a closing certificate for solicitors and lenders.

  • Giant Hogweed

    Hazardous

    Survey: on-site ID, mapping and photographic record, written into a management plan.

    Treat / remove: PPE-led cut, dig and stem-injection. Repeat treatment over 2–3 seasons until the seed bank is exhausted. Site signage during works.

    Document: visit reports, before/after photos and a closing certificate for solicitors and lenders.

  • Himalayan Balsam

    Schedule 9

    Survey: on-site ID, mapping and photographic record, written into a management plan.

    Treat / remove: Pulled by hand or strimmed before seed-set in June. Whole-catchment co-ordination with neighbours and landowners. No herbicide needed for small stands.

    Document: visit reports, before/after photos and a closing certificate for solicitors and lenders.

  • Rhododendron ponticum

    High-impact

    Survey: on-site ID, mapping and photographic record, written into a management plan.

    Treat / remove: Mechanical clearance, stump treatment with approved herbicide, follow-up regrowth control over 3–5 years. Biosecurity protocol on infected sites.

    Document: visit reports, before/after photos and a closing certificate for solicitors and lenders.

  • Buddleia (Butterfly Bush)

    Garden escape

    Survey: on-site ID, mapping and photographic record, written into a management plan.

    Treat / remove: Cut to base, drill-and-fill stump with approved herbicide, masonry repair where roots have penetrated. Repeat inspection at 6 and 12 months.

    Document: visit reports, before/after photos and a closing certificate for solicitors and lenders.

  • Running Bamboo

    High-impact

    Survey: on-site ID, mapping and photographic record, written into a management plan.

    Treat / remove: Root-barrier installation, full excavation of rhizome network, or staged cut-and-treat. Boundary-dispute reports for solicitors on request.

    Document: visit reports, before/after photos and a closing certificate for solicitors and lenders.

⟶ Not just knotweed

We treat five other invasive plants too.

Giant hogweed, Himalayan balsam, rhododendron ponticum, buddleia and running bamboo — all surveyed, treated and documented using the same workflow and lender-friendly paperwork as our knotweed jobs.

See all species

⟶ Decision table

Survey, treatment or excavation — which applies to you

There is no single right answer: the method depends on the plant, the access, the site constraints and your timescale. The comparison below is how we frame the choice on site. Scope, monitoring and any guarantee eligibility are confirmed in writing after a survey.

Survey & management plan

When it suits
Any sale, purchase, remortgage or dispute where a lender, surveyor or solicitor has asked what the plant is and what it affects.
Expected duration
Site visit 1–2 hours; written report typically within 5 working days.
Limitations
A survey identifies and quantifies the problem — it does not treat it. Underground extent is inferred from surface evidence, not excavation.
Guarantee eligibility
Not applicable; the survey is the document that establishes whether guarantee-backed work is available.
Evidence produced
Positive identification, mapped stand extent, proximity to structures and boundaries, photographs, risk rating and a costed plan.

Herbicide treatment programme

When it suits
Gardens, boundaries and amenity land where the stand can be left in place and the timescale is not driven by imminent development.
Expected duration
Typically 3–5 growing seasons of applications plus monitoring visits; visible dieback usually within 4–6 weeks of the first application.
Limitations
Rhizome remains in the ground during the programme. Not suitable close to open water without a permit, or where the ground has to be built on soon. Weather and access affect timing.
Guarantee eligibility
Usually eligible for an insurance-backed guarantee, subject to survey findings and insurer criteria; terms and exclusions are confirmed in writing.
Evidence produced
Management plan, dated treatment log, photographic record at each visit, annual monitoring reports and, where issued, the IBG certificate.

Herbicide plus root barrier or cell burial

When it suits
Sites where the stand sits against a boundary or a planned structure and the material can stay on site.
Expected duration
Installation days to a week; herbicide monitoring continues alongside, commonly 2–3 seasons.
Limitations
Needs space, machine access and (in England) compliance with Environment Agency burial requirements. Barriers control spread; they do not kill the plant.
Guarantee eligibility
Often eligible where the design and monitoring regime meet insurer requirements; confirmed case by case.
Evidence produced
Design drawing, burial or barrier record, waste and materials documentation, monitoring reports.

Excavation and removal off site

When it suits
Development, groundworks, or a sale that cannot wait — where the ground must be clean now.
Expected duration
Commonly 1–5 days on site depending on volume and access.
Limitations
Highest cost. Contaminated soil is controlled waste: registered carrier and permitted landfill required. Restricted access, services and neighbouring land can rule it out.
Guarantee eligibility
Typically eligible for a guarantee on verified clearance, subject to validation excavation and insurer criteria.
Evidence produced
Excavation method statement, waste transfer notes, tipping receipts, validation photographs and a completion report.

On-site screening or soil remediation

When it suits
Larger sites with volume to process and space to work, where landfill costs would be disproportionate.
Expected duration
Project-specific; typically 1–3 weeks plus a monitoring period.
Limitations
Needs plant, space and a competent supervising specialist. Not viable on small residential plots.
Guarantee eligibility
Eligibility depends on the remediation method and the monitoring period agreed at the outset.
Evidence produced
Remediation strategy, screening records, verification sampling, monitoring reports.

Monitor only

When it suits
Isolated stands with no structural or amenity impact, where an owner wants a documented position rather than works.
Expected duration
Annual inspection, ongoing.
Limitations
The plant continues to grow. Lenders and buyers rarely accept monitoring alone where the stand affects a structure or usable garden.
Guarantee eligibility
Not eligible — no treatment work is being carried out.
Evidence produced
Dated inspection reports and photographs showing change over time.

⟶ References

Sources and conditions

Statements about the law, waste handling, lender treatment and guarantees on this page are drawn from the sources below. Requirements change and individual lenders, insurers and local authorities apply their own criteria — check the current source before relying on any point.

Reviewed by

The survey team

PCA-certificated surveyors, Japanese Knotweed Elimination

PA1 / PA6A certificated surveyors who carry out the site visits, write the management plans and sign off the reports issued to lenders and solicitors.

Reviews the method, timescale, guarantee-eligibility and documentation statements on this services page.

What this page can't tell you

  • Guidance is general. Identification, treatment choice and timescales can only be confirmed by a site visit — photographs alone are indicative.
  • Lender and insurer requirements vary by institution and change over time. We state what is typically accepted, not what any named lender will accept on your case.
  • Guarantee (IBG) eligibility depends on the plan chosen, the survey findings and the underwriter's acceptance. It is not automatic.
  • Legal points summarise published law and guidance current at the review date. They are not legal advice.

Last reviewed · Questions on anything stated here: 07582 869979

Not sure which one
you actually need?

Send a photo and a postcode. We'll come back with a recommendation, an honest price band, and zero pressure.

Free survey 07582 869979