In 1951 Jacob (Jaap) WOUDSTRA and Johan DE RIDDER started a practice in Pretoria WOUDSTRA AND DE RIDDER ARCHITECTS. WOUDSTRA died in 1953 and DE RIDDER continued the practice, soon changing the name to JOHAN DE RIDDER ARCHITECT.
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.