After the original Bosch series ended, producers developed this sequel to follow Harry Bosch after his retirement from the LAPD, mirroring the trajectory of the later Bosch novels by Michael Connelly.

Titus Welliver has described Bosch: Legacy as essentially 'Bosch season 8,' though with a different focus since Harry is no longer a cop and the narrative centers on Bosch, his daughter Maddie, and attorney Honey Chandler.

The recurring character Kurt Dockweiler was originally played by Will Chase in season 1, but was recast with David Denman starting in season 2, requiring the reshooting of Dockweiler's season 1 scenes to replace the original footage.

Titus Welliver's real-life sons both play versions of Harry Bosch: younger son Quinn portrays Bosch as a child in the original Bosch series, while elder son Eamonn portrays a young Bosch as an LAPD officer in Bosch: Legacy.

The show features numerous guest appearances by actors reprising their roles from the original Bosch series, including Jamie Hector, Lance Reddick (in his final appearance as Irvin Irving before his death), and Chris Browning.

Season one of Bosch: Legacy drew more total viewers within its first 28 days than any previous season of the original Bosch series had in the same timeframe in the US.

All three seasons of Bosch: Legacy have received a 100% score on Rotten Tomatoes, with Metacritic scores ranging from 71 to 76 indicating generally favorable reviews.