Ervīns and Mārcis started the band in 2004 with inspiration from '70s rock music. Reinis Sējāns, who is now a member of a well-known Latvian band Instrumenti, was playing drums in Laime Pilnīga at that time. He was also the one who came up with the name of the band. Reinis Ozoliņš from the band Alaska Dreamers played bass and was in the first set of members, too. Later on, the set of members changed. The other two members—Jānis and Elvijs—joined Laime Pilnīga in 2006, and there have been no changes ever since. That year Laime Pilnīga performed publicly with the current members for the first time and it was at a celebratory concert for the 25-year anniversary of the Latvian band Pērkons. In 2007 the band started performing all around Latvia.
