Some of the largest projects in the past 60 years implemented by the practice are: the District Headquarters of the SAP in collaboration with Paul VISSER and WPJ LABUSCHAGNE, the Building for the Institute for Electrical Research of the CSIR Pretoria, the Head Office of the Land Bank in Pretoria, the restoration of the Union Buildings in collaboration with the late TW BAKER.
Other restoration projects include: the restoration of the four houses of Paul Kruger on his farm in Rustenburg Boekenhout Fountain, the restoration of the Voortrekker Church in Lydenburg, the restoration of the house of President MW Pretorius at Potchefstroom, the restoration of the house of the poet, Totius, in Potchefstroom. In addition to the foregoing DE RIDDER was responsible for the following buildings: Potchefstroom University for Christian Higher Education (now the Potchefstroom campus of the University of North West): the Animal Science Building, Psychology Building, the Physiology Building, the Pharmacy Building and the Music Conservatory. Altogether, about ± 721 projects have been completed by the practice. This includes ± 35 Church Buildings, ± 200 houses and additions to houses, schools and numerous additions to schools for the NTD. Various Housing Schemes for the Elderly have also been established. In 1969, a Memorial Garden in honor of the Voortrekker leader Louis Trigardt and his people was completed; the design was erected in the heart of Lourenco Marques (now Maputo). The Monument is still intact despite the fact that the Mozambican revolution has since occurred. Finally, recent buildings - called the 10th floor Ararat Youth Centre - has been established and sold and the Single Quarters for Correctional Services in the Prison Grounds in Pretoria.
Johan DE RIDDER retired in 1991 and the practice passed on to his son Josephus Marthinus (Tienie) DE RIDDER.
All truncated references not fully cited in 'References' are those of Joanna Walker's original text and cited in full in the 'Bibliography' entry of the Lexicon.
Electrical Sciences Building for the CSIR: 1982. Tshwane (Pretoria), Gauteng - Architect
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Gereformeerde Kerk: 1958. Lyttelton, Centurion, Gauteng - Architect  
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Gereformeerde Kerk: 1956. North, Krugersdorp, Gauteng - Architect
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Gereformeerde Kerk: 1955. Parys, Free State - Architect
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Gereformeerde Kerk: 1961. Edvanpark, Polokwane (Pietersburg), Limpopo - Architect
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Gereformeerde Kerk: 1959. Potchefstroom, North West - Architect
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Gereformeerde Kerk: 1980. Secunda, Mpumalanga - Architect
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Gereformeerde Kerk: 1958. Thabazimbi, Limpopo - Architect
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Gereformeerde Kerk - Annlin: 1974. Wonderboom, Tshwane (Pretoria), Gauteng - Architect
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Gereformeerde Kerk - Derdepoort: 1970. East Lynn, Tshwane (Pretoria), Gauteng - Architect
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Gereformeerde Kerk - Innesdal: 1954. Rietfontein, Tshwane (Pretoria), Gauteng - Architect
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Gereformeerde Kerk - Oos Moot: 1971. Villieria, Tshwane (Pretoria), Gauteng - Architect
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Gereformeerde Kerk - Totiusdal: 1959. Waverley, Tshwane (Pretoria), Gauteng - Architect
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Gereformeerde Kerk Pretoria Suid: 1958. Tshwane (Pretoria), Gauteng - Architect
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House A de V Marais: 1957. Lynwood, Tshwane (Pretoria), Gauteng - Architect
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House A Nyland: 1968. Groenkloof, Tshwane (Pretoria), Gauteng - Architect
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House AP Schutte: 1969. Waterkloof Ridge Extension 2, Tshwane (Pretoria), Gauteng - Architect
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House ARH Vis: 1963. Lyttelton, Centurion, Gauteng - Architect
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House BJM Kruger: 1955. Theunissen, Free State - Architect
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House CJH du Preez: 1967. Barberton, Mpumalanga - Architect
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House DJF Schribante: 1954. Groenkloof, Tshwane (Pretoria), Gauteng - Architect
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House Dr EL Grové: 1955. Groenkloof, Tshwane (Pretoria), Gauteng - Architect
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House GJ Oosthuizen: 1968. Groenkloof, Tshwane (Pretoria), Gauteng - Architect
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House HJ van Dyk: 1954. Groenkloof, Tshwane (Pretoria), Gauteng - Architect
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House J de Beer: 1957. Queenswood, Tshwane (Pretoria), Gauteng - Architect
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House J de Ridder: 1956. Groenkloof, Tshwane (Pretoria), Gauteng - Architect
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House J Schnettler: 1963. Groenkloof, Tshwane (Pretoria), Gauteng - Architect
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House JA de Ridder: 1958. Clubview, Centurion, Gauteng - Architect
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House JA Grové: 1959. Potchefstroom, North West - Architect
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House JH Basson: 1963. Riviera, Tshwane (Pretoria), Gauteng - Architect
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House JH Grové: 1962. Krugersdorp, Gauteng - Architect
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House JM Hugo: 1964. Heilbron, Free State - Architect
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House L du P Malan: 1957. Waverly, Tshwane (Pretoria), Gauteng - Architect
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House LD van Niekerk: 1954. Groenkloof, Tshwane (Pretoria), Gauteng - Architect
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House LG Runhaar: 1963. Groenkloof, Tshwane (Pretoria), Gauteng - Architect
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House MJ Champher: 1956. Groenkloof, Tshwane (Pretoria), Gauteng - Architect
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House MW Jordaan: 1957. Groenkloof, Tshwane (Pretoria), Gauteng - Architect
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House N van der Merwe: 1955. Meyerspark, Tshwane (Pretoria), Gauteng - Architect
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House OC Vermeulen: 1956. Muckleneuk, Tshwane (Pretoria), Gauteng - Architect
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House PHJ van Rensburg: 1967. Mbombela (Nelspruit), Mpumalanga - Architect
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House SD de Ridder: 1964. Groenkloof, Tshwane (Pretoria), Gauteng - Architect
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House SE Schribante: 1957. Parys, Free State - Architect
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House W Dehning: 1958. Groenkloof, Tshwane (Pretoria), Gauteng - Architect
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Land Bank Headquarters: 1966. Tshwane (Pretoria), Gauteng - Architect
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Louis Trichardttrek Gedenktuin (Remembrance garden): 1969. Maputo, Mozambique - Architect
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Nederduitse Gereformeerde Kerk: 1972. Aranos, Namibia - Architect
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Nederduitse Gereformeerde Kerk: 1968. Mbombela (Nelspruit), Mpumalanga - Architect
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Nederduitse Gereformeerde Kerk: 1977. Kanonkop, Middelburg, Mpumalanga - Architect
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Nederduitse Gereformeerde Kerk: 1956. Sasolburg, Free State - Architect
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Nederduitse Gereformeerde Kerk: 1956. Peacehaven, Vereeniging, Gauteng - Architect
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Nederduitse Gereformeerde Kerk Noord-Oos: 1970. Kilnerpark, Tshwane (Pretoria), Gauteng - Architect
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Nederduitse Gereformeerde Kerk Primrose-Môrewag: 1963. Germiston, Gauteng - Architect
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Nederduitse Hervormde Kerk: 1966. Heilbron, Free State - Architect
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Nederduitse Hervormde Kerk: 1963. Mbombela (Nelspruit), Mpumalanga - Architect
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Nederduitse Hervormde Kerk Lichtenburg-Oos: 1966. Burgersdorp, Eastern Cape - Architect
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North-West University, Animal Science Building: n.d.. Potchefstroom, North West - Architect
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North-West University, Konservatorium - Conservatoire of Music: 1960. Potchefstroom, North West - Architect
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North-West University, Pharmacy Building: n.d.. Potchefstroom, North West - Architect
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North-West University, Physiology Building: n.d.. Potchefstroom, North West - Architect
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North-West University, Psychology Building: n.d.. Potchefstroom, North West - Architect
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Pastorie: 1969. Brakpan, Gauteng - Architect
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Pastorie: 1970. Krugersdorp, Gauteng - Architect
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Pastorie: 1964. White River, Mpumalanga - Architect
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President Pretorius Museum: 1868 : 1980. Potchefstroom, North West - Architect 1980 restoration
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Voortrekker Church - Restoration: 1977. Mashishing (Lydenburg), Mpumalanga - Architect
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