To fix leaking balcony windows, first inspect for damaged weather stripping, cracks, or gaps around the frame. Remove loose or worn components and clean the area. Apply a high-quality silicone or acrylic sealant to seal gaps, ensuring it adheres properly. For persistent leaks, replace the window’s interior or exterior seals and realign hinges or locks. If the frame is corroded or warped, consider professional replacement. Regular maintenance, including annual inspections and cleaning, can prevent future issues.

Leaky balcony windows often result from worn seals, structural damage, or improper installation. According to a 2022 report by the U.S. Department of Energy, 20% of residential energy loss occurs through inefficient windows, with gaps and poor sealing as primary culprits. A study by the National Association of Home Builders found that 30% of window leaks stem from aging weather stripping, which degrades due to UV exposure and moisture. Silicone sealant, when applied correctly, can reduce air leakage by up to 90%, as noted in ASTM International standards. Additionally, the EPA estimates that fixing window leaks can lower heating and cooling costs by 15–25%. Professional repair costs average $200–$800, depending on complexity, but DIY fixes with sealant and hardware adjustments typically cost $50–$150. Proactive maintenance extends window lifespan by 10–15 years, avoiding costly replacements.