Son of Bastiaan Jacobus Vermooten and Petronella Susanna (nee Prinsloo). Attended the Potgietersrust Hoërskool, matriculating in 1937. He enrolled in 1938 at the University of Pretoria for the Diploma course in Architecture, boarding at Kollege Tehuis with the theology students, later to become clients for many of his churches and other projects. He found part time work for GEERS & GEERS in Pretoria and was in turn offered a position in their Johannesburg office in 1939, where he registered with the University of the Witwatersrand, the only Afrikaans speaking student of architecture there at the time, finding boarding in a wood-and-iron room in Braamfontein where other Afrikaans-speaking students of engineering, medicine and others boarded. He received a Diploma in Architecture from the University of the Witwatersrand in 1942. On qualifying the younger GEERS suggested they set up a Pretoria-based partnership, GEERS, VERMOOTEN & GEERS. He set up practice in the home of his parents in Colbyn, but this terminated a year later on the untimely death of GEERS Jnr. He had Tommie (TW) BAKER who had taught him draughting in the Johannesburg office join him in Pretoria as junior partner, but BAKER then set up practice on his own account. He set up partnership with Izak Petrus DU PLOOY (cf HENDRIK VERMOOTEN & DU PLOOY), two juniors who had worked in his office. By 1987 the name had changed to HENDRIK VERMOOTEN DU PLOOY OOSTHUIZEN ARGITEKTE, now VDO. His commissions in the eastern Cape and Natal required extensive travel so in 1947 he obtained a permit to import a plane from the USA, the first of five he was to own, all named 'Kiewiet' numbered 1 to 5. He became a member of the Air Force Commando and served during the period of the Border Wars.
Andries Hendrik Potgieter Gedenksaal: 1945. Ohrigstad, Limpopo - Architect  
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Hostel complex: n.d.. Acornhoek, Mpumalanga - Architect
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Nederduitsch Hervormde Kerk: 1950. eMakhazeni (Belfast), Mpumalanga - Architect
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Nederduitsch Hervormde Kerk: 1950. Ermelo, Mpumalanga - Architect
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Nederduitsch Hervormde Kerk: 1956. Koster, North West - Architect
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Nederduitsch Hervormde Kerk Van Afrika - Vliegepoort: 1950-1951. Thabazimbi, Limpopo - Architect
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Nederduitse Gereformeerde Kerk: 1946. Atteridgeville, Gauteng - Architect
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Nederduitse Gereformeerde Kerk: 1953. Balfour, Mpumalanga - Architect
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Nederduitse Gereformeerde Kerk: 1949. Bloemheuwel, Bloemfontein, Free State - Architect
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Nederduitse Gereformeerde Kerk: 1949. Bultfontein, Free State - Architect
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Nederduitse Gereformeerde Kerk: 1963. Danielskuil, Northern Cape - Architect
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Nederduitse Gereformeerde Kerk: 1949. East London, Eastern Cape - Architect
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Nederduitse Gereformeerde Kerk: 1955-1956. Fraserburg, Northern Cape - Architect
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Nederduitse Gereformeerde Kerk: 1950. Walmer, Gqeberha (Port Elizabeth), Eastern Cape - Architect
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Nederduitse Gereformeerde Kerk: 1962. Griekwastad, Northern Cape - Architect
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Nederduitse Gereformeerde Kerk: 1953. Humansdorp, Eastern Cape - Architect
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Nederduitse Gereformeerde Kerk: 1959-1960. Mahikeng, North West - Architect
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Nederduitse Gereformeerde Kerk: 1954. Marble Hall, Limpopo - Architect
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Nederduitse Gereformeerde Kerk: 1954. Mbombela (Nelspruit), Mpumalanga - Architect
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Nederduitse Gereformeerde Kerk: 1949. Mossel Bay, Western Cape - Architect
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Nederduitse Gereformeerde Kerk: 1949. Oranjeville, Free State - Architect
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Nederduitse Gereformeerde Kerk: 1914 : 1948. Paul Roux, Free State - Architect
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Nederduitse Gereformeerde Kerk: 1952. Perdekop, Mpumalanga - Architect
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Nederduitse Gereformeerde Kerk: 1953. Senekal, Free State - Architect
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Nederduitse Gereformeerde Kerk: 1946. Quaggapoort, Tshwane (Pretoria), Gauteng - Architect
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Nederduitse Gereformeerde Kerk: 1961. Riviera, Tshwane (Pretoria), Gauteng - Architect
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Nederduitse Gereformeerde Kerk: 1952. Tweeling, Free State - Architect
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Nederduitse Gereformeerde Kerk: 1957. Zeerust, North West - Architect
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Nederduitse Gereformeerde Kerk - Albertyn: 1957. Lephalale (Ellisras), Limpopo - Architect
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Nederduitse Gereformeerde Kerk - Fourth: 1968. Hopetown, Northern Cape - Architect
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Nederduitse Gereformeerde Kerk - Gamtoosvallei: 1950. Patensie, Eastern Cape - Architect
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Nederduitse Gereformeerde Kerk - Noord: 1955. De Aar, Northern Cape - Architect
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Nederduitse Gereformeerde Kerk - Noord: 1946. Krugersdorp, Gauteng - Architect
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Nederduitse Gereformeerde Kerk - Noord: 1955. Ladybrand, Free State - Architect
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Nederduitse Gereformeerde Kerk - Parys Oos: 1952. Parys, Free State - Architect
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Nederduitse Gereformeerde Kerk - Second: 1951. Chrissiesmeer, Mpumalanga - Architect
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Nederduitse Gereformeerde Kerk - Vrede Wes: 1959. Vrede, Free State - Architect
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Nederduitse Gereformeerde Kerk - Wes Suiderlig - Second: 1950. Krugersdorp, Gauteng - Architect
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Nederduitse Hervormde Kerk: 1955. Klerksdorp, North West - Architect
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Nederduitse Hervormde Kerk: 1952. Zeerust, North West - Architect
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Wonderboom Airport: n.d.. Wonderboom, Tshwane (Pretoria), Gauteng - Architect
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