In the living room of this Montana home, which was a collaboration between interior designer Madeline Stuart and architect David Lake, smooth concrete walls surround a steel firebox devised by the architect.

A starburst granite-and-marble floor punctuates the entrance hall of El Sueño, a Los Angeles house decorated by Madeline Stuart.

In the master bedroom of El Sueño, panels of a screen once owned by William Randolph Hearst, flank the Art Deco–style bed.

An antique Bakhtiari carpet inspired the living room’s color scheme.

Stuart renovated a historic bungalow in Santa Barbara, California, as a getaway to share with her husband, writer Steve Oney. In the living room, their Parson Russell terrier, Mr. Peabody, rests on a Madeline Stuart Collection sofa.

A kitchen Madeline Stuart created for a 1950s dwelling in Los Angeles.

The living room in this Los Angeles home is furnished with seating by Stuart.