The Flavel House is approximately 11,600 square feet and consists of two and a half stories, a single story rear kitchen, a four-story tower, and a full basement. The interior woodwork around the doors, windows, and staircases are Eastlake-influenced in design. The Douglas Fir doors, moldings, and wainscoting were faux wood-grained by a master craftsman to look like exotic hardwoods such as mahogany and burl rosewood. The wood likely came from a mill in Portland or San Francisco and was shipped to Astoria by steamer.
Six fireplaces grace the home and feature different imported tiles from around the world, elaborate hand-carved mantels, and a patterned metal firebox designed to burn coal. The fourteen-foot high ceilings on the first floor and the twelve-foot high ceilings on the second floor are embellished with plaster medallions and plaster crown moldings. The house was very modern with wall-to-wall carpeting, gaslighting, indoor plumbing, and a central heating system.
The First Floor is comprised of the public rooms such as the grand entrance hall, the formal parlor, the music room (the scene of musical recitals by the Flavel daughters), the library (the heart of the house), the dining room, and the conservatory. The butler’s pantry, the kitchen, and the mudroom make up the housekeeping area.
The Second Floor features the main bathroom, five bedchambers, and a small room used as a sewing room or storage room.
The Attic Floor is a large, unfinished area with two small plain bedrooms used by the Flavel’s domestic help. The tower gave the Captain a broad view of Astoria and the Columbia River to keep an eye on the local ship traffic.
The Basement of the house originally had a dirt floor and contained a large wood-burning furnace.