A darkroom is only needed for printing, but then you also need an enlarger, easel, &c.

For development you either need a darkbag (glorified dark cloth bag with 2 sleeves) or a "daylight development tank" which exist since the 50s and let you develop without any additional equipment: https://casualphotophile.com/2020/08/17/leitz-agfa-rondinax-...