Welcome to 18 Mill Island Road, where one-floor living is at its best, surrounded by woods and the quiet natural beauty of Arrowsic. Set on nearly 4 private acres, this thoughtfully designed home offers over 3, 400 square feet of living space with 3 bedrooms, 5 bathrooms, and a layout that seamlessly blends comfort, functionality, and privacy. True one floor living – this custom home includes 3 bedrooms w/ en-suite bathrooms, a chef’s kitchen & suite of Viking appliances, open eat-in kitchen, living room with cathedral ceilings, skylights, gas fireplace, brand new hardwood hickory floors (2026), radiant heat, attached 2-car garage w/ direct entry to custom pantry and laundry. Separate formal dining area, finished walkout basement w/ half bath, workshop over the heated garage, automatic generator, wrap-around farmers porch, oversized entertaining deck and above ground pool. Each bedroom has an en-suite bath, or retreat to the oversized primary suite featuring a Jacuzzi tub, multi-nozzle shower, custom built-ins, and a spacious walk-in custom closet. French doors lead directly from the primary suite to an expansive rear deck that spans the entire length of the home, creating a seamless connection to the outdoors. Designed for comfort in every season, the home features radiant floor heating and heat pumps for efficient heating and cooling throughout. The finished daylight walkout lower level provides flexible space for a home office, fitness area, or guest overflow, along with abundant storage. Outside, nature takes center stage. Surrounded by mature trees, peaceful woodland views from every window, the property offers privacy and a true sense of retreat. The expansive rear deck is ideal for entertaining or simply taking in the tranquility of a private wooded setting. Minutes away-Sewall Pond and Reid State Park! A rare opportunity to enjoy comfort, space, and nature in one of Maine’s most sought-after coastal communities!