All six members of the original "Brady Bunch" cast reunited on the red carpet in Los Angeles.

Maureen McCormick (Marcia), Barry Williams (Greg), Eve Plumb (Jan), Christopher Knight (Peter), Mike Lookinland (Bobby) and Susan Olsen (Cindy) all gathered on Thursday night for the premiere of their new HGTV series "A Very Brady Bunch Renovation."

“It’s been a really long time since all of us have been back together,” McCormick told "Today" show hosts Savannah Guthrie and Hoda Kotb in April.

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“I think everyone looks at the projects as they come, and this one I think just got us all. It was HGTV who, you know, their programming is amazing. This whole show is filled with so much love, the crew, everybody behind it — it’s a work of love,” McCormick added.

The upcoming HGTV show documents the renovation of the interior of the North Hollywood house used in exterior shots on “The Brady Bunch.”

From left to right, Maureen McCormick, Barry Williams, Eve Plumb, Christopher Knight, Mike Lookinland and Susan Olsen

From left to right, Maureen McCormick, Barry Williams, Eve Plumb, Christopher Knight, Mike Lookinland and Susan Olsen (Richard Shotwell/Invision/AP)

“One of the nice things about the show will be the sentimentality of it, the nostalgia,” Williams said. “Because when we’re going in the rooms, we’re reflecting on what happened and the scenes that we played.”

Each cast member was assigned a specific room in the house to remodel with the help of other HGTV stars such as the “Property Brothers" — aka Drew and Jonathan Scott.

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The goal is to make the house as close to the series as possible — although the cast never filmed inside. The classic sitcom was actually filmed at Paramount Studios’ Stage 5 in Hollywood.

“They’re very specific about what goes into the house, they are trying to make it look exactly like the set, down to the wallpaper,” Plumb said. “From the outside, the house looks completely the same.”

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“The Brady Bunch” originally ran on ABC from 1969 to 1974 and was widely regarded as a hallmark of family-oriented American television.

"A Very Brady Bunch Renovation" premieres on Sept. 9 on HGTV.

Fox News' Ann W. Schmidt, Bradford Betz, and The Associated Press contributed to this report.