This floor, which remains today, incorporates mostly Texas marble chips. Interior walls are adorned with nearly seven miles of wainscoting made of oak, pine, cherry, cedar, walnut, and mahogany. Door and window frames are constructed of oak or pine, except for those in the Governor's Reception Room, which are made of cherry. The Extension opened to the public on January 11, 1993. The Capitol Extension utilizes skylights to allow a large amount of natural light into the building and provide spectacular views of the Capitol dome.
Every legislative office enjoys natural light from one of six skylight-covered light courts.
Each hearing room holds 75 to 100 people, and includes space for wheelchairs and the media. Most of the conference rooms are designed for smaller meetings, but the auditorium seats about 350 people.