Sunroom additions are a unique type of home addition that allows homeowners to add usable space while maximizing natural light and connection to the outdoors. In Portland and Vancouver, where long gray seasons are common, sunrooms are often used to create bright, comfortable living areas that feel separate from,  but still connected to, the rest of the home. This guide explains what sunroom additions are, how homeowners typically use them, what factors influence cost, and what climate considerations matter most in the Pacific Northwest.