At SE Knotweed, residential Japanese knotweed removal is the survey, costed treatment and guarantee that clears knotweed from a home and gives a mortgage lender the document they need for a sale.
Residential knotweed removal typically costs between £2,200 and £7,000 for a domestic garden, with a herbicide programme at the lower end and full excavation at the top, confirmed at survey once the stand is measured.
At SE Knotweed, residential Japanese knotweed removal is the survey, costed treatment and guarantee that clears knotweed from a home and gives a lender the document they need for a sale. We confirm the species, measure the stand against the RICS 3 metre zone, agree the method that fits your garden and timescale, and hand over a management plan and a guarantee.
It differs from a commercial job in scale rather than approach: the same methods, the same waste duty, but usually a single garden stand and a mortgage or sale as the reason for acting. Get in touch to book a survey and we will set out the plan for your property.
You do not have to remove knotweed from your own garden, because having it is not an offence, but it becomes a practical necessity when you come to sell, remortgage or if it starts spreading to a neighbour. An untreated stand can hold up a sale while a valuer flags the risk, and letting it spread beyond your boundary is an offence under the Wildlife and Countryside Act 1981.
For most homeowners the trigger is a move or a mortgage rather than the law. If you are selling, our mortgages and selling page explains what a lender needs, and a survey gives you the certainty to plan.
Residential knotweed removal costs between £2,200 and £7,000 for a typical domestic garden, with a herbicide programme at the lower end and full excavation with licensed disposal at the top. The figure is driven by the size of the stand, access for machinery, and the volume of soil classed as controlled waste.
We measure the stand at survey and give a fixed price rather than a headline rate, and we often credit the survey fee against the treatment. The cost pillar breaks the figure down by method and size.
The method that suits your home depends on how quickly you need the garden clear, whether the soil can stay in place, and your budget. A herbicide programme is the lowest cost and runs across 3 to 5 seasons, while excavation clears the stand in days but costs the most because the soil is dug and removed.
Where a sale is not urgent and the soil can stay, herbicide usually wins on cost; where you are moving or building, excavation or a root barrier keeps the ground usable straight away. The table sets the methods against speed and relative cost so you can weigh them before the survey.
| Method | Speed | Relative cost | Best for | Soil / waste | Guarantee |
|---|---|---|---|---|---|
| Herbicide treatment | 3 to 5 seasons | Lowest | No sale deadline, soil can stay in place | Minimal | Insurance-backed |
| Excavation and disposal | A few days | Highest | Fast clearance and development plots | Soil removed under licence | Insurance-backed |
| On-site relocation (cell burial) | 1 to 2 weeks | Medium to high | Larger sites keeping soil on the plot | Buried on site to a cell | Insurance-backed |
| Root-barrier membrane | Days | Medium | Containing spread at a boundary | Minimal | Situational |
| Combination treatment | Varies | Medium | Mixed or access-restricted sites | Varies | Insurance-backed |
Knotweed affects selling or remortgaging because a valuer flags it as a risk and the lender wants it managed before lending, but it rarely stops a mortgage outright. Most lenders proceed once there is a management plan from an accredited firm and an insurance-backed guarantee that would fund further treatment if the plant returned.
You must also declare it on the TA6 form when selling, and since 2020 you may only answer No if certain there is no rhizome within 3 metres of the boundary, as our selling page explains. Arranging a survey and a costed plan is the step that moves a stalled sale forward.
You get a 10 year company guarantee with an insurance-backed guarantee available up to 15 years, which commits an audited contractor to returning and re-treating at no further cost if regrowth appears within the term. It is the same document a mortgage lender relies on, and it is what lets a sale proceed while the treatment continues.
The guarantee page explains how the cover works and why a lender accepts it. We issue the guarantee certificate with the management plan, and where soil was removed, the waste transfer note as well.
After treatment the garden enters a monitoring period, and the guarantee covers any regrowth during it. For a herbicide programme this runs across the remaining seasons with return visits to confirm the rhizome is dead; for excavation the ground is clear immediately and monitored for any missed fragment.
We hand over the management plan, the guarantee certificate and any waste records, so you have one file for a future sale or remortgage. Our aftercare page explains what the monitoring involves and when the site is signed off.
You should choose an accredited firm because a lender only accepts a plan and guarantee from an audited contractor, and that acceptance is the whole point of the work when a sale is at stake. We hold PCA approval, TrustMark registration (licence 2902558) and the CSJK surveying qualification, and we back the work with a 10 year company guarantee and insurance-backed guarantee cover up to 15 years.
We give a fixed price at survey, often credit the survey fee against treatment, and hand over the documents a solicitor and lender need in one file. Contact us with your address for a survey and a costed plan you can act on.
INSURANCE-BACKED GUARANTEE
An insurance-backed guarantee from an audited contractor commits to returning and re-treating at no further cost if regrowth appears within the term. It is the document that reassures a mortgage lender, because it moves the future risk off the property. The term is confirmed with your plan.
Tell us the address and what a surveyor flagged. We confirm the plant, record the RICS category and set out the figures.