Gauge the urgency
An active leak or a slow, hidden one
Water spraying from a pipe, dripping through a ceiling or spreading across a floor is an emergency. Shut the main valve if it is safe to reach, keep clear of wet areas near electrical equipment and request emergency service rather than a detection appointment.
Slow, hidden leaks are different. A stain that grows over weeks, a musty smell or water use that creeps up without explanation calls for a planned search. Note when you first noticed the change so the inspection can follow how it developed.
