The cost to professionally reseal a skylight typically ranges from $200 to $600, depending on the accessibility of the roof, the steepness of the pitch, and the extent of the prep work required. This price generally covers cleaning the frame, removing old degraded caulking, applying high-grade exterior polyurethane or silicone sealant around the glass and exterior joints, and checking the immediate flashing perimeter. If the technician discovers minor damage to the surrounding flashing or requires specialized equipment to reach a high, steep skylight, the total expense may lean toward the higher end of the range. While DIY homeowners with roof safety gear can purchase a tube of professional sealant for $10 to $25 and complete the job themselves, hiring an insured professional ensures proper application and reduces the risk of overlooking hidden structural leaks.
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