Treatment Comparison
Excavation vs Herbicide Treatment for Japanese Knotweed
Choosing the right knotweed treatment can save you thousands and shave years off your project timeline. Here's how the two main methods compare for UK property owners, developers and landlords.
Herbicide Treatment
From £1,500 · 3–5 years
Pros
- Lowest cost option
- Minimal site disruption
- No spoil to remove
- Includes 10-year guarantee
Cons
- Multi-year programme
- Not suitable for immediate development
- Seasonal application window
Excavation
From £5,000 · Days to weeks
Pros
- Immediate clearance
- Ideal for development sites
- On-site burial / cell options
- Mortgage-ready sign-off
Cons
- Significantly higher cost
- Landfill disposal expensive
- Heavy plant access required
Not sure which method is right?
Book a free qualified survey and we'll recommend the most cost-effective option.
Frequently Asked Questions
It depends on your timeline, budget and end use of the land. Herbicide treatment is cheaper and less disruptive but takes 3-5 years. Excavation gives an immediate clearance, ideal for development sites, but costs significantly more.
When delivered by qualified contractors using the correct active ingredients (typically glyphosate-based) and a multi-year programme, yes. We back our treatments with a 10-year insurance-backed guarantee.
Strongly discouraged. Even a 0.7g rhizome fragment can regrow. Soil contaminated with knotweed is classed as controlled waste under the Environmental Protection Act 1990 and must be removed by a licensed carrier.
Full excavation with rhizome screening offers near-immediate eradication, but residual rhizomes can still regenerate. We always recommend a 24-month monitoring period regardless of method.