His father moved to New Zealand via Australia from the UK in 1840, married Elizabeth on 16 April 1841, and served as colonial architect and superintendent of public works in the administration of Governor William Hobson.
According to his obituary in The Northern Advocate newspaper[2] Henry Holman helped defend the city of Whangārei during the uprising involving Māori leader Hōne Heke.
Holman's notable works in Auckland include the former Rendells department store on Karangahape Road, designed in 19th century Edwardian Renaissance style and constructed in two stages, each consisting of a three-storey building, the first in 1907 and the second in 1911.
[11] In Auckland's central business district Holman was the architect of the former Smeeton's Buildings[12] at 75 Queen Street, now known as Encom House, built in an Edwardian Baroque style of cement and brick, and completed in 1910.
Auckland City Council's heritage register notes that "the flamboyance of the building’s façade makes it a significant feature in the streetscape".