The main house, called the "lodge," is built of fieldstone and stucco; its gable roof is covered with red terra cotta tiles. The lodge is listed in the National Register of Historic Places. The plan and form of the house are mostly original and its architectural style is not easily defined.

The most outstanding feature of the house is the thirty by seventy foot living room which makes up the entire second floor. Its many large picture windows are most unusual for the era. Balconies take full advantage of the lodge's mountaintop setting, providing dramatic views of the surrounding scenery. Massive fieldstone fireplaces stand at either end of the living room. According to one popular story, the large moosehead over the west fireplace was a gift from President Theodore Roosevelt. The floor and trim in the room, as well as the original furniture, are dark oak. Signed photographs of many dignitaries are displayed on the walls; among them are William Taft, Herbert Hoover, Theodore Roosevelt, and Marshall Joffre of France.

On the ground floor the dining room lies to the right of the main entrance hall. The dining table and chairs are those used by the Weeks family. The red tile floor is also original.

The area to the left of the entrance hall formerly contained six bedrooms. In 1966 it was converted to a display area for exhibits tracing the history of forestry and conservation in New Hampshire. It also houses an impressive mounted bird collection.