Whether you're hoping to finish an attic, create a legal bedroom, add a bathroom, or bring more natural light into your home, understanding the full cost of a dormer addition is essential. This guide breaks down the true cost of dormer additions in the Pacific Northwest, including structural work, interior finishing, permits, engineering, long-term maintenance, and return on investment.

Dormers play a crucial role in how PNW homeowners expand existing homes without increasing the footprint, a major advantage in neighborhoods where lot sizes, zoning restrictions, and historic overlays limit traditional additions. When designed well, a dormer can transform an attic or half-story into a bright, functional bedroom, bathroom, office, or bonus room, dramatically increasing a home’s livability and resale value.