Transport for London (TfL) has said that construction on the project, which will provide a spacious ticket hall and step-free access to platforms via a lift, “is progressing well”.
The station was shut for six months last year while initial works took place, with the old 1960s ticket hall reopening in December.
Passengers currently have to use a one-way system through a temporary passageway to access the platforms.
This system will be in place until the autumn, when work to build a new station building is completed.
The ticket gates in the existing ticket hall have been removed meaning customers using contactless or Oyster cards have to touch in and out using the ticket validators.
The main structure of the new ticket hall building is completed, and installation of the internal structure is almost finished, with fit-out works under way.
According to TfL, sustainable elements have been incorporated into the design, including a green roof.
The project was made possible by £43.1 million of government funding, some of which will also be used to upgrade Leyton Tube station.
TfL has said that without the upgrade to Colindale station, it would have reached passenger capacity by 2026.
