In 1988, Henket and Wessel de Jonge founded Docomomo International, the working party for the documentation and conservation of buildings, neighborhoods and landscapes of the Modern Movement.
In 1999, the Dutch Broadcasting Corporation showed the documentary Hubert-Jan Henket, man van staal, hout en glas (Hubert-Jan Henket, man of steel, wood and glass) in the documentary series "Het Uur van de Wolf".
Examples of restorations of 20th century buildings are Zonnestraal sanatorium (1928-1931) by Jan Duiker and Bernard Bijvoet in Hilversum (together with Wessel de Jonge) and the Academy of fine arts (1956) by Gerrit Rietveld in Arnhem.
He was invited and participated in the limited competitions for the Nederlands Architectuur Instituut (NAi) in Rotterdam (1988), het Rijksmuseum (2004), the Stedelijk Museum (2005) and the Hermitage(2005) all in Amsterdam.
From 1996 until 2008, he was the supervisor of architecture of Amsterdam Airport Schiphol, he is a member of the supervising teams of among others het Hart van Zuid in Hengelo, de Spoorzone in Tilburg, and the Afsluitdijk.
In 2004, he and Wessel de Jonge won" the BNA Kubus" of the Dutch Federation of Architects because of their contribution to the re-vitalization of architectioral heritage.