disengage autopilot...

[onurair 24]

Also no restriction from the company side here. It depends on the flown approach. 2D or 3D approach, what category of ILS and so on.
If I have strong winds and gusts I'll dissconnect the autopilot very early to have a better feeling of the conditions. If I'm IMC I'll wait until the rwy is insight. There are so many factors... so no defined altitude or nav point to disconnect the autopilot.

[FlierHawk 9]

Once established and configured i'll disconnect the AP.  usually around 1,500ft generally not later than 1,000 ft.  I like to have a feel of the plane a fair bit before touchdown.