Roofs and flat roofs
A flat roof holds a pond of water and the ceiling underneath has no stain. Has the survey called the covering failed because of the pond?
No. The survey has not called the covering failed because of the pond. Standing water shows that the falls or the outlet are not clearing the flat roof, which can age the felt or membrane, but a pond is not itself a split in the covering. The ceiling underneath had no stain, so a leak into that room was not seen on the day. The inspection recorded water lying on the roof. It did not water-test the covering, did not cut a core, and did not decide that the flat roof is at the end of its life.
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?
Flat roofs are meant to shed water to an outlet. A pond means that journey is interrupted, by a low spot, a blocked outlet or a fall that runs the wrong way. Water that lies there loads the deck and can find a weak lap later. None of that is the same sentence as the covering has failed. Failure would be water getting through, which the clean ceiling does not show. The note should keep ponding and leakage apart.
A roofing contractor can clear the outlet, check the falls and say whether the covering still sheds once the pond can leave. Tell the solicitor the report records standing water and an unstained ceiling, not a condemned membrane. Do not commission a full strip on the pond alone. The survey has not specified a new covering and has not said the deck is rotten. If the pond sits against a wall, that junction is the extra place to point out.
What should you ask your surveyor?
- Did you record ponding, rather than a failed covering?
- Was the outlet blocked, or was the water simply lying in a hollow?
- Which ceiling did you see with no stain under this roof?
What are the typical next steps?
- Keep the note as ponding with no stain seen below.
- Have the outlet and the falls checked before anyone replaces the covering.
- Do not describe the membrane as failed on the pond alone.
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
If the pond is deep, has the covering failed?
Depth of standing water still does not show a hole in the covering. The survey saw a pond and an unstained ceiling. It has not called the flat roof failed because the water looked deep. No later decision about the pond was made, and this visit did not supply one.
Does a dry ceiling mean the falls are adequate?
No. A dry ceiling means a leak was not seen in that room. The pond remains a drainage fault the survey recorded, and the falls were not given a clean bill of health. What happens next for the falls is outside this note and was not settled here.