After first training in his native Sint-Niklaas he spent the rest of his career in Antwerp with intermittent periods of work in London where he made portraits of prominent individuals such as Benjamin Disraeli and Sir George Elliot.
His fellow students at the academy included Piet Van Der Ouderaa, Karel Ooms and Willem Linnig the Younger.
Van Havermaet made his debut at the Antwerp Salon of 1867 where he showed his portrait paintings.
The couple had four children: Françiscus Emilius, Waltherus Joannes, Carolus Petrus Maria and Léonia Albina Elisabeth.
Carolus known as Charles Van Havermaet became a painter and worked the latter part of his life in London.
[6] From 27 September 1886 until his death, Van Havermaet taught the subject 'Drawing of the figure after life and after antiques'.
[2] From the 1895 school year until his death, Van Havermaet was allowed to teach a second course at the same institution, namely the subject of 'shadowed drawing after plaster, bust, etc.'.
A notice in the Journal des Beaux-Arts of 1879 states that Pieter Van Havermaet recently moved to London to paint some works there.
Van Havermaet often added some genre elements to his portraits by portraying the sitters engaged in some everyday activity.