Japanese Knotweed Removal in Portsmouth
Looking for Japanese knotweed control near you in Portsmouth? We survey, treat and remove Japanese knotweed for homeowners, landlords, developers and councils across Portsmouth and the surrounding Hampshire villages. Photo identification and an online quote are free; a professional on-site survey with a written report starts from £250 and is credited against the works if you proceed.
Portsmouth site visits
Surveyors covering PO1, PO2, PO5 and the wider Hampshire area.
10-year guarantee
Insurance-backed and transferable on sale.
£10m liability cover
Qualified operatives and licensed waste disposal.
Why Japanese knotweed is a problem in Portsmouth
On Portsmouth properties, Japanese knotweed rhizome spreads several metres underground, exploits cracks in hard standing and drains, and can stall a mortgage offer or sale. Portsmouth's dense naval dockyards and reclaimed harbour land have long offered knotweed disturbed footholds, while the old railway embankments feeding into Portsmouth Harbour station and Hilsea's brownfield sites continue to harbour persistent stands.
Read more on our japanese knotweed treatment guide or see the full Portsmouth knotweed service.
Portsmouth coverage map
Our surveyors cover Portsmouth and the surrounding Hampshire villages and hamlets. The map below shows the area we work in daily for Japanese knotweed surveys, herbicide programmes and excavation.
Local landmarks we work near
- Portsmouth Historic Dockyard
- Spinnaker Tower
- Southsea Common
- Portsdown Hill
Villages and hamlets covered
- Hilsea
- Cosham
- Portchester
- Farlington
- Widley
- Purbrook
- Bedhampton
- Drayton
Everything plotted on the Portsmouth map is covered by our teams, including Hilsea, Cosham, Portchester, Farlington, Widley, Purbrook, Bedhampton and Drayton, and the ground around Portsmouth Historic Dockyard, Spinnaker Tower, Southsea Common and Portsdown Hill.
How we treat Japanese knotweed in Portsmouth
Treatment method
We use a three to five year stem-injection and foliar herbicide programme, or hybrid and full excavation with licensed off-site disposal where timescales are tight.
Best timing
Most effective late summer to early autumn, when the plant draws herbicide down into the rhizome.
Your legal position
Listed on Schedule 9 of the Wildlife and Countryside Act 1981 — allowing it to spread to neighbouring land can bring a civil claim, and the cut material is controlled waste.
Local coverage
Portsmouth and nearby Hilsea, Cosham, Portchester.
Japanese Knotweed pricing near Portsmouth
Herbicide programmes from £1,500; hybrid excavation from £4,000; full excavation from £8,000. For a firm figure, send photographs through the free online survey or request a free online quote and we will price the Portsmouth works the same day.
Japanese Knotweed in Portsmouth — FAQs
Related invasive weed help for Portsmouth
Knotweed is rarely the only problem on a Portsmouth plot. The same crews treat running bamboo in Portsmouth gardens, giant hogweed on Hampshire watercourses and Himalayan balsam along Hampshire riverbanks. If you are mid-sale, start with what mortgage lenders require for knotweed and our property survey reports.
Species we treat in Portsmouth
- Japanese knotweed removal in Portsmouth — identification, treatment and excavation
- running bamboo removal in Portsmouth — rhizome excavation and root barriers
- giant hogweed removal in Portsmouth — safe removal of a burn-causing species
- Himalayan balsam removal in Portsmouth — riverbank and site-wide clearance
- horsetail (marestail) removal in Portsmouth — long-term control programmes
- unidentified weeds removal in Portsmouth — photo guide to every species we treat
Buying, selling or letting in Portsmouth
- mortgage lender requirements for Portsmouth property — RICS categories and the paperwork valuers ask for
- insurance claims for Portsmouth property — policy exclusions and the evidence insurers want
- encroachment and legal advice for Portsmouth property — nuisance claims and owner obligations
- insurance-backed guarantees for Portsmouth property — 10-year cover that transfers on sale
- removal costs for Portsmouth property — survey, treatment and excavation pricing
- excavation vs herbicide for Portsmouth property — choosing a method for your timescale