An SE Knotweed surveyor arriving at a house with a survey case, beside the branded SE Knotweed van, with a Japanese knotweed stand nearby.

Specialists in Japanese knotweed

Japanese knotweed dealt with, properly

As a PCA-approved, TrustMark-registered specialist we identify the plant, remove it, and back the work with a 10 year company guarantee and insurance-backed guarantee cover up to 15 years, in the form that lets a stalled sale proceed.

Book a survey Free photo identification

No-obligation survey and a costed plan. Call 0800 852 7784.

PCA approved

The industry body for invasive weed control.

TrustMark registered

Government-endorsed quality, licence 2902558.

CSJK surveyors

Qualified, experienced and up to date.

Insurance-backed cover

Up to 15 years, in the form lenders accept.

How we help

A worried homeowner needs three things in order: to know it really is knotweed, to know what removal costs and how long it takes, and to know the work is guaranteed in a form a lender accepts. We do all three.

A stand of Japanese knotweed established in a domestic garden. — A Japanese knotweed stand established in a domestic garden.

Japanese Knotweed Removal

We remove Japanese knotweed by treating or excavating the stand and its underground rhizome, ending in a written management plan and an insurance-backed guarantee a mortgage lender accepts.

Japanese Knotweed Survey

We survey a knotweed stand by confirming the species on site, measuring it against the RICS 3 metre zone, and recording its management category from A to D.

Japanese Knotweed Treatment

We treat Japanese knotweed by killing or removing its rhizome, using herbicide programmes, excavation, on-site relocation or a root barrier depending on the site.

Knotweed and Mortgages

We unblock mortgages and sales held up by Japanese knotweed by producing the survey, management plan and insurance-backed guarantee that lenders and valuers require.

Knotweed Removal Cost

Japanese knotweed removal costs from around £1,200 for a herbicide programme to £12,000 for full excavation on a large site.

Knotweed Law

We set out the law on Japanese knotweed plainly: having it is not an offence, causing it to spread into the wild is, its soil is controlled waste, and encroachment from a neighbour is a private nuisance question.

Recent work on site

Our own photographs from knotweed jobs across the country: survey, treatment and full excavation, each removed and recorded to the duty of care.

An SE Environmental operative on site during Japanese knotweed works at a UK property. — An SE Environmental operative on site during a knotweed survey and treatment visit.

Japanese knotweed treatment works underway at a job site carried out by SE Environmental. — Knotweed treatment works underway at a client site.

A Japanese knotweed stand at a job site recorded and treated by SE Environmental. — A knotweed stand recorded and treated at a client site.

What it costs

Removal typically runs £2,200 to £7,000 for a domestic garden, and a survey £150 to £500, both confirmed on site.

Please treat every figure as indicative until a surveyor has seen the stand.

Where the law stands

Having knotweed is not an offence. It matters for a sale, a mortgage or a boundary, and the RICS 2022 standard grades each case from Category A to D. We record the category the way a lender reads it.

Where we work

We cover England and Wales from one national team. Start with your nearest city for local knotweed records, the ground we see there and an indicative cost.

See every town and region we cover

INSURANCE-BACKED GUARANTEE

The one document that unblocks a sale

A mortgage valuer wants to see that the knotweed risk is managed. We back completed work with a 10 year company guarantee, with insurance-backed guarantee cover up to 15 years, which commits to further treatment at no cost if the plant returns within the term and is what lets a lender proceed.

Book a survey

Trading address, opening hours and VAT number to be confirmed. All figures indicative and confirmed at survey.