Originally, the main campus was built in 1995 by Hestrup & Associates as Wredling Middle School with a capacity of 1300; in 1999–2000 it was expanded and converted into St. Charles' second high school at a cost of $41,600,000.
ɚɹˈɪdʒɪnəli, ðə mˈeɪn kˈæmpəs wʌz bˈɪlt ɪn nˈaɪntiːnhˈʌndɹɪd nˈaɪnti fˈaɪv baɪ hˈɛstɹʌp ænd ɐsˈoʊsɪˌeɪts æz ɹˈɛdlɪŋ mˈɪdəl skˈuːl wɪð ɐ kəpˈæsᵻɾi ʌv wˈʌn θˈaʊzənd θɹˈiːhˈʌndɹɪd; ɪn nˈaɪntiːnhˈʌndɹɪd nˈaɪnti nˈaɪn tˈuː θˈaʊzənd ɪt wʌz ɛkspˈændᵻd ænd kənvˈɜːɾᵻd ˌɪntʊ sənt. tʃˈɑːɹlz sˈɛkənd hˈaɪ skˈuːl æɾə kˈɔst ʌv dˈɑːlɚ fˈoːɹɾi wˈʌn,sˈɪkshˈʌndɹɪd,zˈiəɹoʊzˈiəɹoʊ zˈiəɹoʊ.