Electrics and gas
An oil fire valve is fixed by the back door and the tank is at the far fence. Does seeing the valve mean the oil line was tested?
No. Seeing the oil fire valve by the back door does not mean the oil line to the tank at the far fence was tested. The survey can record the valve where it was fixed and the tank at the fence, if both were in sight. It has not pressure-tested the pipe between them, proved the valve shuts, or traced a buried run. A fire valve is a fitting you can see. The line is the part that may be hidden for the whole distance. Ask an oil technician to test that line rather than trusting the sight of the valve.
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 fire valve is there so the oil can be shut off near the appliance if something goes wrong. Seeing it by the back door tells you a valve was fitted at that point. The tank at the far fence is a separate object. The pipe that should join them can be buried, clipped under a deck, or missing in part, and a visual survey does not test it. The valve's handle being present is not a worked test.
Ask an oil technician to inspect the valve, find the line, and say what length they could test or only see. Do not trip the fire valve on a viewing to watch the appliance stop. If the pipe disappears at the doorstep, say so when you instruct them. Keep the survey as two sightings: a valve by the door and a tank at the fence. The untested piece is the oil line between those points.
What should you ask your surveyor?
- Was the oil line visible between the fire valve and the tank, or only the two ends?
- Did you operate the fire valve, or only see that it was fixed by the door?
- Any joint, bury or sleeve on the line that you could not follow?
What are the typical next steps?
- Do not treat the visible fire valve as a test of the oil line.
- Ask an oil technician to trace and check the line to the fence tank.
- Do not trip the fire valve on a viewing.
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 boiler fired, has the oil line passed?
No. A flame does not pressure-test the pipe from the door valve to the tank at the fence. The survey did not test that line.
Does a new-looking valve mean the buried pipe is new as well?
No. The valve is one fitting by the door. The line to the far fence was not dated or tested by seeing it.