Exterior design for NEW CHAPEL HOUSE of RIKKYO UNIVERSITY requires careful consideration to obtain harmonization between its contemporary function and neighboring historical buildings, especially the OLD CHAPEL, built a hundred years ago. Through research on bricks and tiles of existing buildings along with study on supply routes of antique over-burned bricks, we refer to several technical approaches on conservation, utilization and extension of historical buildings. We expect our approach concerning authenticity and integrity to assist their planning and design stages.