What the set looked like.
There is not much written about the sets used, but I was lucky enough to be contacted by Lisa Lasarus, who worked on Hart to Hart from 1980-1984. She wrote the treatment for the episode In the Hart of the Night. Lisa gave me a lot of background detail, including her memories of the set (or sound-stage as she called it). Go to the section On the set: a scriptwriter remembers by clicking on the link if you would like to read more details about her time working on Hart to Hart and see the scans of her script treatment.
Note: the house sets changed appearance over time as the first three seasons episodes were filmed at Twentieth Century Fox Studios , and then the last two seasons moved to The Burbank Studios ' Lisa describes the set on the Burbank lot.
Lisa's description of the sound-stage.
"You came into the Burbank Studios through the Olive Avenue gate. Of course, you didn't get in without an appointment. Then, once you found a place to park, (which was nearly impossible), the Hart to Hart sound stage was the second one on the right past the Employment office.
You went through a small door next to the two huge loading doors. To the immediate right was the bathrooms, to the immediate left, the craft service table ( for coffee/tea/bagels). Beyond this table, staying to the left was the front of the Hart's house, and front door. To the rear of that set was the crate where Freeway stayed when not needed. To the right, you first see the makeup/hair dressing area. I think there were 3 or 4 stations with chairs and mirrors, like a beauty parlour. There was a "hallway" set right around that area, but I cannot remember to what side. If you continued on past the makeup area, you came to the actual Hart house interior. The kitchen door on the show, actually leads to the kitchen. The stairs don't go anyplace.
The Hart's driveway and front gate were on the lot.
As far as exterior locations, many of the sets were existing ones on the lots at either Fox or Burbank, depending where the company was at that time. (You are aware that everyone from Fox was basically fired and a whole new staff came on at Burbank).
When I was on the set at the studio, I would wander around into the kitchen, or around the back of the set to the outdoor patio. When shots were being set up, I would usually sit on the fireplace hearth, or I would hang out in the makeup area with Donna Turner. Did you know the paintings in the living room were done by one of the crew members? (Except the Van Gogh).