Welcome to 22 Blue Heron Way, a beautifully maintained Colonial with a separate ADU, ideally located in the heart of Marshfield's sought-after Green Harbor area. Tucked away in a desirable cul-de-sac neighborhood, this home offers the perfect combination of neighborhood living and the coastal lifestyle, with beaches, dining, recreation and local amenities all close by. The main home has been thoughtfully cared for and updated, including a new roof and rear fencing, along with updated kitchens, bathrooms and hardwood flooring within the last ten years. Relax on the welcoming farmer's porch or enjoy the spacious 25' x 14' composite rear deck overlooking the fenced-in backyard-an ideal setting for pets, play and outdoor entertaining. A large two-car garage adds plenty of storage and convenience. Adding tremendous flexibility is the separate ADU featuring an additional bedroom, full bathroom, kitchen and living room, plus new flooring, new kitchen cabinets and fresh paint throughout. Ideal for extended family, guests or additional living needs. Homes in this neighborhood rarely become available. Don't miss this opportunity to own a well-loved and meticulously cared-for home in one of Marshfield's favorite coastal communities.