Electrics and gas
One underfloor loop is labelled as the bedroom and that room's floor was cold while others were warm. What leak or valve fault has not been located in the slab?
No leak and no valve fault has been located in the slab. One underfloor loop is labelled as the bedroom, and that room's floor was cold while other floors were warm. The survey has matched a label to a cold surface. It has not opened the slab, pressure-tested the loop, or found whether a valve is shut, a pipe is leaking, or the loop is simply not calling. The cold floor is an observation. The cause under the floor is still unlocated.
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?
A labelled manifold tells you which pipe is meant to serve the bedroom. It does not prove the pipe is intact or open. A cold floor beside warm ones shows uneven heat on the day. A shut valve, air, a failed actuator or a leak in the slab can look the same from above. The survey did not lift the floor and did not trace water under it.
Ask a heating engineer to test that loop at the manifold before anyone opens the slab, and keep a leak as unproved until they find one. Tell the solicitor the report does not locate a fault in the concrete. Do not describe the home survey as a pressure test or as an electrical test of the controls. The cold bedroom floor remains a note, not a found leak.
What should you ask your surveyor?
- Which loop label matched the bedroom, and was that floor the cold one?
- Did you locate a leak or a valve fault in the slab, or only the cold surface?
- Were the manifold valves operated as a test, or left as found?
What are the typical next steps?
- Leave any leak or valve fault in the slab unlocated.
- Ask a heating engineer to test the labelled loop at the manifold.
- Do not describe the visit as a pressure test of the floor.
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 bedroom radiator, if any, is warm, is the loop fine?
A warm radiator would be a different emitter. The survey's note is the underfloor loop labelled as the bedroom and a cold floor while others were warm. That does not locate a leak or a valve fault in the slab. No pipe was traced under the floor. Another heat source in the room would not test this loop.
Does a neat manifold label prove the pipe runs to that room?
No. A label is what someone wrote. The survey saw the bedroom label and a cold floor in that room. It did not trace the pipe through the slab and did not prove the label is accurate. The fault, if there is one, was not located. The writing on the manifold is not a map that was checked.