Electrics and gas
What can a surveyor say about radiators without testing the heating?
They can say what they see: leaks at valves, rusted panels, missing radiators under cold windows, or pipes surface-mounted through rooms. They cannot say the system heats evenly or that the boiler is safe. A cold radiator in summer is not a failed radiator. A wet valve is a leak.
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?
Balancing, sludge and a magnaclean are heating-engineer territory. A survey that says “may contain sludge” because a panel is cold at the bottom on a day the system was off is guessing. Ask them whether the system was running. If it was not, the limitation should say so.
Replacing every radiator is a choice, not a finding. Quote the ones that leak. There is no RICS price for a full new set. A Gas Safe engineer looks at a gas boiler. A plumber looks at a leaking valve. Do not pay both to replace a houseful of panels that are only old.
What should you ask your surveyor?
- Was the system running?
- Which radiators are actually leaking?
- Are you inferring sludge, or did you see a leak?
What are the typical next steps?
- List leaks separately from “the system is old”.
- Get a heating quote only for what was seen and for a service if you want the boiler tested.
- Do not deduct the cost of all-new radiators from a single weeping valve.
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 missing radiator under a window a defect?
It may be a choice a previous owner made. The survey can note the cold spot risk. It is not proof the system has failed.
Do thermostatic valves need a survey?
They are controls. The survey does not commission them. A heating engineer can say if they work when the system is on.