Water on a slab can result from more than a visible basement-wall leak.
Follow the moisture pattern
Floor-edge puddling differs from diffuse condensation across a cool slab.
Check surrounding systems
Plumbing, drains, and outdoor water routing can imitate a foundation leak.
Fix before finishing
Identify and control the moisture source before installing carpet, laminate, or other sensitive flooring.
What to do before hiring
Photograph the affected area and record when moisture first appears. Ask the person assessing the basement to distinguish water entry from condensation or plumbing, explain what the recommended work will accomplish, and identify the discharge route for any collected water.
If you see significant wall movement, widespread damage, or suspect an electrical hazard, arrange an appropriately qualified assessment before proceeding with routine waterproofing.