Knollwood is located in southeastern Dublin, on the south side of Upper Jaffrey Road at its junction with Snow Hill Road. The main house is located well south of the road, on a cleared plateau with panoramic views of nearby Mount Monadnock and the hills to the south. The house is a 2+1⁄2-story frame structure, with a hip roof and shingled exterior. Its main section is roughly H-shaped, with a long ell extending to the west, and a porch extending across much of its southern facade. A number of Queen Anne-style chimneys project from the roof.[2]