Kondo married Takumi Kawahara in 2012. At the time they met, Kawahara was working in sales support and marketing at a corporation in Osaka. Once Kondo’s career took off, he left his job to become her manager and, eventually, CEO of Konmari Media, LLC. The couple have two daughters, Satsuki and Miko.

A two-part TV dramatisation was filmed in 2013 based on Kondo and her work, titled 人生がときめく片づけの魔法 (Jinsei ga Tokimeku Katazuke no Mahō). She has lectured and made television appearances. She released a series of videos teaching “the best way to fold for perfect appearance”.

On 1 January 2019, Netflix released a series called Tidying Up with Marie Kondo. In the series, Kondo visits various American family homes full of clutter and guides the families in tidying up their houses through her KonMari method. Following the release of her Netflix series, Kondo was the subject of various Internet memes. A clip of her saying “I love mess” included on Time’s list of the ten best memes of 2019.

On 4 February 2019, Kondo appeared on The Late Show with Stephen Colbert on CBS.

In January 2020, Kondo appeared alongside Rola on the cover of Numero Tokyo magazine, wearing Yoshikimono, the fashion brand created by rock musician Yoshiki.