<P> The home featured in the exterior shots was on Chiquita St, near Lankershim Boulevard in Los Angeles . The house has since been demolished and replaced . The interiors were filmed on two separate sound stages at the studio: one for the main floor and one for the upstairs . </P> <P> The show's team of producers included Robert L. Jacks, Gary Adelson, Greg Strangis, and Phil Fehrle . Executive producers were Lee Rich and Philip Capice . </P> <P> As a production of the Lorimar stable, who were concurrently producing CBS's The Waltons, writers were often contracted by the producers and were shared between both programs . (Waltons costar Will Geer also made an Eight is Enough guest appearance during season 2 .) Regular writers included Peter Lefcourt, the writing teams of Gwen Bagni and Paul Dubov, Rod Peterson and Claire Whittaker, Bill Nuss and Dusty Kay, Nick Thiel and David Braff, J. Miyoko Hensley and Steven Hensley, Bruce Shelly, Sandra Kay Siegel, Gil Grant, Karen I. Hall, and Hindi Brooks, who soon became the show's long - time story editor . In - house directors included Philip Leacock, Harry Harris, and Irving J. Moore . As an in - joke, the character name of one of Nicholas Bradford's best friends was Irving Julius Moore, a nod to the director of the same name whose middle name was, in fact, Joseph . </P> <P> For the show's first two seasons, an upbeat instrumental piece written by Fred Werner was used as the show's opening theme . Beginning with the show's third season, this was replaced by a slowed - down vocal theme titled "Eight Is Enough," which was sung by series co-star Grant Goodeve . The song had music by Lee Holdridge and lyrics by Molly - Ann Leikin, and was first heard in a longer arrangement on the last episode of the second season titled "Who's on First?", which was also performed by Goodeve . </P>

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