Questionnaire survey was made to designers who have experienced building conversion. Interview was also made to experts in building codes as a supplementary survey. The results are as follows.
1. Some provisions obstruct building conversion such as smoke exhaustion, floor load, daylighting, etc.
2. The degree of obstruction differs according to related provisions and building use.
3. The building standard law of Japan does not adapt building conversion. It should be completely remade for its promotion.
