Flood risk
A flood vent is blocked by decking. Has anyone shown how water would cross that vent?
No one on this visit has shown how water would cross that vent. The flood vent was seen blocked by decking, which is a record of an obstruction, not a demonstration of flow. The survey did not lift the decking, did not run water at the opening, and did not measure any flood depth. A government flood-risk check is a separate product and was not this inspection. Seeing the blockage does not prove what a flood would do at the wall. The path across the vent stays untested.
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?
Flood vents are openings meant to let water through a wall or a void so it is not trapped on one side. Decking built across the face closes that opening, whatever the original purpose. The survey can see timber or boards in the way. It cannot stand water against the vent, time how it passes, or say the house would be safe if the decking were removed. A blocked vent is a condition note. It is not a flood model.
Ask the solicitor for any flood-risk search and for paperwork on the vent or the decking, and keep those papers separate from the survey. The government check, if you order it, is still not a test of this opening. Do not tell a lender the vent works because it was identified by name. If someone needs to show a clear path, that is a later look with the decking out of the way. This report stops at the blockage it could see.
What should you ask your surveyor?
- Was the vent seen blocked, rather than trialled with water?
- Did this visit measure any flood depth?
- Is a flood-risk check a separate product from the survey note?
What are the typical next steps?
- Treat the vent path as untested.
- Ask the solicitor for any flood search and decking papers.
- Do not tell a lender the opening was proved to pass water.
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
Would removing the decking be something this survey has already done?
No. The decking was in place and was recorded as blocking the vent. The visit did not take it up and did not inspect the opening behind it. A later removal would be a different event. Until then the survey can say the face is obstructed. It cannot describe the clear opening, the fixings, or how water would cross.
Does naming the vent on a flood-risk map test this opening?
No. A government flood-risk check is a map product for the area. It does not lift decking or pass water through this vent. The survey only recorded the blockage it could see. Neither product has measured depth at the wall or shown a clear path. Order the check if you want the map, and keep it beside the note rather than instead of it.