Costs & quotes
Compare knotweed removal quotes in Swansea
Local providers do not publish fixed rate cards: the stand size, access, method, monitoring period and guarantee determine the price.
No honest fixed price without a survey
Herbicide treatment can be a multi-year programme. Excavation adds machinery, transport and licensed disposal. A low headline price may omit the guarantee or later visits a buyer or lender expects.
Illustrative guide only
£1,836+
A third-party Swansea cost guide lists herbicide treatment for an area up to 5m² from £1,836. This is not a provider quote or guaranteed current price.
View sourceChecked 13 September 2026
Swansea quote directory
Inclusion is not an endorsement. Verify current qualifications, insurance and guarantee terms yourself.
| Provider | Coverage | Published price | Contact |
|---|---|---|---|
Swansea Council Swansea Site visit and Japanese knotweed treatment service | Landowners and businesses in Swansea | Free visit and written quote The council says the quote is based on the size of the affected area and aims to arrange an appointment within 10 working days. | 01792 636000 Request quote |
Total Weed Control Neath Identification, surveys, herbicide programmes and removal | Swansea and South Wales | Contact for quote Offers a free photo identification service and quotation. Ask which guarantee and survey documentation are included. | 01639 710914 Request quote |
Knotweed Wales Tonna, Neath Surveys, treatment and elimination programmes | Swansea and South Wales | Contact for quote States that five and ten-year insurance-backed guarantees are available. Confirm eligibility and terms in writing. | 01639 637707 Request quote |
Clearsafe Knotweed Swansea Valley Surveys, herbicide treatment, excavation and construction-site removal | Swansea and most of South Wales | Free survey and quote Offers no-obligation surveying. Ask separately about landfill, membrane, monitoring and guarantee costs. | 0800 634 9275 Request quote |
Environet UK National provider Surveys, herbicide treatment and excavation | Dedicated Swansea service | Contact for quote A national option with a Swansea service page. Compare travel, guarantee and follow-up terms with local providers. | See provider website Request quote |
Compare like for like
Ask every quote to include
Send the same photographs and site information to each provider, then compare the written scope rather than the total alone.
- Survey and scaled site plan
- Treatment method and number of seasons
- Every follow-up visit and regrowth response
- Insurance-backed guarantee where a lender requires one
- Waste transport, disposal and transfer notes if soil is removed
- VAT, access equipment and any work on neighbouring land
Prices and provider claims change. Obtain written quotations directly, check the Property Care Association or TrustMark where relevant, and ask your lender what evidence it requires before instructing work.