What changed, and when?
Think back to the first time you noticed the concern. Was the sink being used? Had the shower just finished? Or was the room not in use at all? Share the sequence as you remember it; there is no need to recreate the problem.
- Which room and surface are affected?
- Is water visible, or is there only a mark?
- Does it appear continuously, occasionally, or after ordinary use?
- Have you noticed it in more than one place?
If a photo is already available, mention that during the call and ask whether it would be useful. You don’t need to send anything through this website.
A mark alone doesn’t tell the whole story.
A discoloration and a visible drip are different observations. Neither tells you the cause on its own. Describe what is happening now, including whether the area looks different from yesterday or whether you have noticed the same mark before.
Keep the description literal. “It’s underneath the basin” is more useful than guessing that a particular hidden pipe has failed. Leave opening surfaces, dismantling fittings, and working out the cause to a qualified professional.
Ask what an assessment would involve.
Call with your property address and ask whether this concern and location can be accommodated. Discuss how a visit would be arranged, what access would be needed, and whether there is an assessment or visit charge.
If work is proposed, ask for the explanation and cost before authorizing it. For a rental or shared building, tell the owner or property manager what you have noticed and check who can approve access and work.