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The most common signs you need to repair your stucco are cracks and stains. Contractors can visually inspect or probe stains, chips, or soft spots if they indicate underlying damage. Excessive staining and black mold growth can indicate water damage behind the stucco.

Stucco repair can take an hour or two if it's a small crack repair or window caulking job. However, more extensive jobs, such as remediating water damage, patching or replacing large areas, or replacing the siding completely, can take three or four days or more. The time it takes to repair stucco depends on the type and extent of damage.

Hairline cracks in stucco aren't necessarily serious, but they need fixing as soon as you spot them. Hairline cracks provide ingress for water, letting moisture slowly penetrate the stucco, which can cause significant and expensive issues over time. Wider and deeper cracks are more significant and require prompt, professional inspection and remediation.

One of the main signs of water behind stucco is unexplained cracks. You may also notice chips and chunks of stucco breaking off. Missing caulking or caulk gapping and cracking around windows and doors is another indicator of moisture buildup behind your stucco. 

Stucco that looks or feels damp several days after rain, has discolored patches, soft spots, or other issues may have moisture problems and need professional repair. You may also find that the drywall inside your home, below windows, feels soft. This indicates moisture behind the stucco, damaging your home's walls from the outside in.