Wolf House was not a castle in any sense of the term, though Jack and others referred to it as that. It was big, unpretentious, open, natural, and inviting, just like its builder. It was designed as a busy author's workshop, and as a home big enough for the many needs of the Londons, and for the entertainment of their friends.

Jack's workshop was to be 19 by 40 feet with a library of the same size directly under it on the second floor, connected by a spiral staircase. Here he would have room to work and house his huge library. At the time his books were stored inaccessibly in every building on the ranch. The work area was completely secluded from the rest of the house. High on the fourth floor and directly above Charmian's apartment Jack's sleeping quarters perched like an eagle's nest.

The 18 by 58 foot living room was two stories high with rough redwood balconies extending three-fourths of the way around. A huge stone fireplace and open ceiling rafters made a cozy nook of the huge room. One large alcove in the room was designed for Charmian's beautiful Steinway grand.

Wolf House had its own hot water, laundry, heating, electric lighting, vacuum and refrigerating plants, a milk room, storeroom, root cellar, and wine cellar.