Natusch was born in Hastings in 1921, the son of architect Rene Natusch. During World War II, he served in the New Zealand Division of the Royal Navy from 1942 to 1945 on destroyers and motor torpedo boats, serving in the North Sea and English Channel for D-Day operations. He was awarded the Distinguished Service Cross in May 1944, for good service against enemy light forces.
Natusch's grandfather, Charles Natusch, had arrived in New Zealand in 1886 and founded the architectural and quantity surveying firm, Natusch & Sons. Guy Natusch was active in the firm from 1946 to 1997, working on both commercial and residential projects. His style of architecture emphasized the building's function over its appearance. He also developed a basic housing project called Solwood Houses.
- 1950 Bisson House, Napier
- 1951 Red Cross Hall, Napier
- 1952 Rathbone House, Waipawa
- 1953 War Memorial Hall, Napier
- 1962 Wool Exchange Building, Napier
- "Naval awards". Evening Post. 26 July 1944. p. 6. Retrieved 19 April 2015.
- Warnock, Ann (9 January 2010). "Modernist fights to save the past". Dominion Post. p. 15.
- Natusch, Guy K. "Natusch, Charles Tilleard". Dictionary of New Zealand Biography. Ministry for Culture and Heritage. Retrieved 19 April 2015.
- "New Year honours list 2003". Department of the Prime Minister and Cabinet. 31 December 2002. Retrieved 19 April 2015.