There is no specific rule regarding how often you need to apply a fresh coat of interior or exterior paint to a government building. On average, exterior paint jobs last anywhere from 5-7 years, but the climate has a large role in how long paint jobs will last. Because the exterior of a government building is so public-facing, we recommend repainting it as soon as you see signs of wear to help maintain its beautiful exterior. Interior painting typically happens once every 5 years or so or as often as needed.