Japanese knotweed

Where a report pairs bamboo with the fence line, what stays open about a spread the survey photographs and does not excavate?

Bamboo at the fence line was photographed. What stays open is the spread underground, because the survey does not excavate. Canes at the boundary show where growth is above ground. They do not show how far runners have gone under the fence, into either garden. The report has recorded the visible stand. It has not mapped the rhizomes, and it has not decided that the spread stops at the boards. That extent remains undecided.

Last reviewed 24 October 2026. Written for buyers in England and Wales unless this answer says otherwise. No named surveyor has signed this page. It is general guidance, not a report on your house, and not legal advice.

What is the fuller explanation?

Running bamboo spreads on underground rhizomes, which can travel past a fence without a cane showing on the far side yet. A photograph fixes the canes, the distance to the fence and any lifting of nearby paving that was already visible. It cannot follow a runner through soil. Excavation would be a different instruction, and this survey did not do it. Treating the photo as a map of spread overstates a picture. The fence is a line on the surface, not a barrier the survey has proved.

Tell the solicitor bamboo was seen at the fence, and that underground spread was not investigated. If the stand is close to the boundary, ask what the seller knows and whether any containment was attempted. A specialist who deals with bamboo can advise on extent, which may mean looking beyond photographs. Do not read the survey as having dug, and do not assume the neighbour's side is clear because no cane was leaning over it.

What should you ask your surveyor?

How close to the fence were the canes that were photographed?
Was any lifting of paving or soil visible at that line?
Has a specialist been asked to consider underground spread?

What are the typical next steps?

Treat the photographs as a record of visible canes only.
Tell the solicitor the underground spread was not excavated.
Ask a bamboo specialist if you need the runners assessed.

Costs vary with the building and with who you instruct. Where this page does not cite a published figure, ask the surveyor, a relevant specialist, or your solicitor for a written quote. Do not treat a forum average as the price.

Also asked about this

Do the photographs show runners under the next garden?

No. They show bamboo at the fence line, above ground. The survey does not excavate, so runners under either garden were not seen. Spread stays open. A picture of canes is not a map of rhizomes beyond the fence. The boards are not a proved stop.

Is bamboo the same finding as knotweed?

No. Bamboo and Japanese knotweed are different plants. This note is about bamboo photographed at the fence. It is not a knotweed identification, and it is not a clearance. Each plant needs its own reading. Do not swap the names.