Chimneys and parapets
What should you ask if a cowl has fallen into a chimney pot and blocked it?
Ask whether the pot is obstructed, not whether it is missing. A cowl or cap that has dropped inside can block the flue while the pot is still there and upright, which is a different path from a pot that has gone. From the ground a surveyor may see the cowl askew and may not see an object in the pot, the survey does not camera the flue, and using the fireplace is an appliance question the survey has not signed off.
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?
Terminals are only useful if they stay on the pot and if they are the right sort for how the flue is used. A fallen cowl can sit like a plug. Smoke, if anyone lights a fire, and moisture, if they do not, both meet that plug. A home survey is a visual look from a distance. It will not lean over the pot. If the terminal was not clearly seen, the report should say the top of the pot was unclear, not that the flue is clear.
A sweep can often say whether the pot is blocked. That is not included in the home survey. There is no RICS fee for it inside the survey. Approved Document J covers combustion installations. It does not identify a fallen cowl on this house. If you plan a stove, stop and get a competent installer. If you do not, still ask for the blockage to be described, because a plugged pot is not the same repair as a missing pot or a cracked one.
What should you ask your surveyor?
- Did you see the cowl on the pot, in the pot, or not at all?
- Is the pot itself present and upright?
- Are you excluding a sweep and an appliance test?
What are the typical next steps?
- Ask a sweep before anyone lights the fire.
- Do not buy a new pot if the old one is there and only the cowl has dropped.
- Tell the contractor the terminal may be inside the pot, so they bring access.
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
Is a bird nest the same finding?
It is another blockage. The survey can suspect it and cannot measure it. A sweep confirms it. Do not call a nest a missing pot.
Does a rain cap lying in the garden mean the pot is clear?
It means that cap is no longer on the pot. Something else may still be in the flue. The survey has not proved it empty.