To fix a leaking bathroom window, start by inspecting the window frame and glass for cracks or gaps. Use caulk to seal any visible cracks and apply weatherstripping around the edges to prevent air and water infiltration. If the window is damaged beyond repair, consider replacing it with a newer, more durable model. Regularly check for mold or rot and clean it using a mixture of water and mildew cleaner. Ensure the window sills are properly aligned and sealed to avoid water pooling.

Leakage in bathroom windows often occurs due to worn-out seals, cracks, or misaligned frames, allowing water to enter during rain or high humidity. According to the Environmental Protection Agency (EPA), addressing window leaks can reduce energy losses by 10–15%, as inefficient windows account for 10–25% of household energy waste. Weatherstripping and caulk are cost-effective solutions, with caulk costing approximately $5–$15 per tube and weatherstripping $10–$30 per window. A 2021 study by the National Association of Home Builders found that 80% of window-related leaks stem from gaps around the frame, emphasizing the importance of sealing. Replacing a damaged window can cost $300–$1,500, depending on material and installation, but often yields long-term savings. Mold growth from leaks, linked to respiratory issues, underscores the need for prompt repair. Regular maintenance and professional inspections can prevent costly damages, as 60% of home insurance claims related to water damage involve undetected leaks (Insurance Information Institute, 2022).