catflap.org Online Dictionary Query

  make structural alterations to sth. /mˌeɪk stɹˈʌktʃəɹəl ˌɒltəɹˈeɪʃənz tʊ ˌɛstˌiːˈeɪtʃ/
  etw. umbauen, bauliche Veränderungen an etw. vornehmen  [arch.]  [constr.]
     Synonyms: alter sth., convert sth.
  
   see: altering, converting, making structural alterations, altered, converted, made structural alterations, alter a building, alter / convert a farm building into storage and offices