[7] Farrell made designs for buildings in Northland, Auckland, the Waikato, and the Bay of Plenty during his tenure.

Farrell started designing more simpler and less detailed buildings in 1914 in line with contemporary architectural beliefs.

[7] One of the last buildings Farrell designed as Auckland Education Board architect was the Ponsonby School at Curran Street.

This building was innovative for the time with reinforced concrete posts and beam frames used to create large openings.

[3] Farrell resigned from his role in 1924 to travel the world with his wife and son before returning to Auckland in 1925.

He served as a president of the Auckland Orphans' Club and was a life member of the Old Thames Boys' Association.