Welcome to 11 Greatstone Drive! The opportunity has come where you can have an expansive colonial home, with a legal ADU, and tucked into a highly sought after neighborhood in Merrimack NH! Just minutes from major highways, shopping, dining, and entertainment, with an easy commute in every direction! The headline feature is the legal in-law apartment in the finished basement, completely redone from top to bottom with new flooring, a brand-new kitchen, and a fully updated bathroom. Whether you need space for extended family, a private guest suite, a home office, or supplemental rental income, this flexible space delivers. The main level is designed for the way you live and entertain. The large kitchen is a true showpiece, anchored by a massive 10-foot island with room for the whole crowd, rich granite counters, and generous cabinet space. A designated dining room filled with natural light sits just steps away, perfect for gatherings. The living room offers a comfortable retreat, while the grand family room provides sprawling space for movie nights, play, and everything in between. Two half baths on this level mean guests never have to venture upstairs. Upstairs, four spacious bedrooms await, led by a serene master suite with its own private full bath featuring an updated stand-up shower. An additional full bath in the hallway serves the remaining bedrooms with ease. Outside, the beautifully landscaped 1+ acre lot offers privacy and room to roam, with a deck made for summer evenings. A 2-car garage completes this exceptional Merrimack offering. Showings to begin at the open house on Friday 10/2 from 5pm - 6:30pm