Preparing your home for underfloor leak detection means providing clear information, safe access and useful background about the plumbing or heating system, without disturbing the suspected leak. Good preparation helps the technician compare symptoms with test results and identify the likely source while limiting unnecessary investigation.
Gather relevant information before the inspection
- Write down which rooms or areas show dampness, staining, mould, unusual smells or changes in temperature.
- Record whether the symptoms vary when taps are used, toilets are flushed, the heating operates or hot water is running.
- Keep details of any recent plumbing, heating, flooring or building work that may have affected pipes below the floor.
- Locate property documents that may help, such as plans showing pipe routes, underfloor heating layouts or records of previous repairs. These are useful but not essential.
Make the property safe to inspect
- Tell the plumber about any known electrical faults, damaged flooring, structural concerns or areas that may be unsafe to walk across.
- Keep children and pets away from the inspection area so testing can be carried out safely and equipment is not disturbed.
- Do not enter a confined floor void, remove boards or move heavy fixtures unless this has been specifically assessed as safe and necessary.
- If water is close to electrical sockets, appliances or wiring, mention this before the inspection and avoid handling affected equipment.
Provide practical access around the property
Although the suspected room is usually the main focus, the inspection may require comparison with adjoining rooms, pipe runs, utility areas or outside drainage points. Make sure doors can be opened and that the technician can reach relevant inspection covers, service points and visible pipework. If the property is rented or managed by a landlord, arrange any permissions needed for investigation and possible access to shared or communal areas.
Let the technician know about rooms that cannot be entered, recently redecorated surfaces, fitted furniture and flooring that must be protected. This allows the inspection method to be considered in advance and clarifies where non-invasive checks can be made.
Keep evidence of changes
Photographs of staining, pooled water, damaged skirting or changes in flooring can help show how the problem has developed, particularly if the affected area has dried before the appointment. Note dates rather than relying on memory, and keep any relevant readings from home monitoring equipment. Do not clean away significant staining immediately before the visit, as its position and appearance may provide useful clues.
What not to do beforehand
- Do not apply sealant, fill cracks, repaint stains or dry out the area in a way that hides the evidence.
- Do not run repeated tests, drain systems or alter heating settings unless advised, because changing the system can affect the conditions being assessed.
- Do not assume that the wettest point is directly above the leak. Water can travel through screed, insulation and structural materials before becoming visible.
Underfloor leak detection may involve moisture assessment, pressure checks, acoustic investigation, thermal imaging or tracer methods, depending on whether the suspected source is a water supply pipe, heating circuit or another concealed route. Preparing accurate observations and safe access supports a more targeted investigation, while leaving the floor and pipework undisturbed preserves the evidence needed to establish the leak's location.
