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Identification, treatment and guaranteed eradication plans.
Japanese Knotweed Removal Cost Guide
Transparent pricing for every treatment method. We believe in honest quotes with no hidden charges. Every project starts with a completely free survey.
Get a Free Online Quote: 07849 464418Treatment Options & Indicative Costs
Herbicide Treatment
From £1,500
Typical residential property
- 3-5 year treatment programme
- 3-4 visits per growing season
- qualified technicians
- RICS-compliant reporting
- 10-year insurance-backed guarantee
- Least disruptive method
Best for: most residential infestations where there is no immediate time pressure.
Excavation (Dig & Dump)
From £5,000
Depends on volume of soil
- Complete removal in days
- All contaminated soil removed
- Disposed at licensed landfill
- Immediate problem resolution
- 10-year insurance-backed guarantee
- Ideal for development sites
Best for: urgent house sales, development sites, or where complete removal is needed quickly.
Management Plan Only
From £750
Survey + plan + guarantee
- Full professional survey and report
- RICS-compliant documentation
- Insurance-backed guarantee
- Satisfies mortgage lenders
- Annual monitoring visits
- Treatment added if needed
Best for: properties with dormant or historic knotweed where a guarantee is needed for a mortgage.
What Affects the Cost?
Size of Infestation
Measured in square metres. Larger areas need more herbicide and more visits. A 10m² patch costs less than a 100m² infestation.
Proximity to Structures
Knotweed within 3 metres of a building, drain or wall requires more careful treatment and potentially excavation.
Access Difficulty
Sites with restricted access (narrow paths, steep slopes, no vehicle access) increase the time and labour required.
Treatment Method
Herbicide is the most cost-effective. Excavation costs more due to machinery, haulage and landfill disposal fees.
Urgency
Standard treatment programmes are cheaper than emergency responses. If you need results quickly, excavation is faster but pricier.
Required Documentation
Mortgage lender reports, management plans and insurance-backed guarantees add value but are often included in our fixed-price quotes.
Beware of Unqualified Providers
Always check that your weed control provider holds recognised qualifications, waste carrier registration and an insurance-backed guarantee. Non-professional providers may not offer valid guarantees, which means your management plan may not satisfy mortgage lenders. The cheapest quote could end up costing you thousands if the work is not done correctly.
Frequently Asked Questions
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Related services & coverage areas
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Related services
- Excavation vs HerbicideWhich removal method suits your site, timescale and budget
- Treatment PlansMulti-season herbicide programmes with written records
- Mortgage Lender RequirementsRICS categories, lender criteria and the paperwork valuers ask for
- Free Online SurveySend photos and get an expert assessment the same day
Japanese knotweed does not stop on its own
Identification, treatment and guaranteed eradication plans.
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Not sure what's growing? Upload photos through our free online survey or call 07849 464418 and our qualified experts identify 50+ species at no cost. Need someone on site? A professional survey with a full written report starts from £250.