In 2009 – the same year Stereolab became inactive – she ended the Monade project and began to perform solo work under her own name; her current band is known as the Lætitia Sadier Source Ensemble.

Sadier was working as a nanny when she met McCarthy guitarist Tim Gane at one of the band's Paris gigs during the late 1980s.

For the first incarnation of the band, they enlisted ex-Chills bassist Martin Kean, drummer Joe Dilworth and Gina Morris on backing vocals.

[6] She retired the project in 2009 to perform new songs under her name, and released a solo album titled The Trip in September 2010; it was followed by Silencio in 2012 and Something Shines in 2014.

In 1997, Sadier sang on "Schnick Schnack Meltmade" on Mouse on Mars' Autoditacker LP,[11] and she and Mary Hansen contributed vocals to the Cache Cœur Naif EP.

[14] In 2009 the French label Deux Mille released an EP which features Sadier singing with Toulouse-based band Momotte.

[18] In 2019 she appeared on the Mercury Rev album Bobbie Gentry's The Delta Sweete Revisited where she sang lead vocals on the track Mornin' Glory.

[20] On 13 November 2023, Sadier announced her fifth solo album, Rooting for Love, with a release date of 23 February 2024 by Drag City.

[21] The album's central theme, Sadler says, is "a call for Gnossis" which she describes as "an inquisitive outlook that will lend clue to the traumatised civilisations of earth."