A Room is the basic rectangular framing form.  It's comprised of four walls, a ceiling, a floor and one or more entrances.  it can also have windows and other features on the the walls.  The most simple structures are rooms with a roof (e.g., cottage or shed). Based on a few dimensions, one can estimate the materials needed for a room. 

The construction materials for a room include:

• floor joist and subflooring
• wall framing: vertical joists and horizontal plates (top plates are typically doubled on load bearing walls)
• electrical (wiring, fixtures, outlets, heating elements)
• cable and phone infrastructure
• ceiling joists or studs
• wall board (drywall, paneling, insulation)
• flooring (carpet and padding, hardwood, laminates, linoleum, tile)
• finishing (paint, wall paper, wainscoting, baseboards, crown molding, door and window trim)