This paper describes the contribution of educators in planning new school buildings and adapting existing facilities. It also looks at the measures needed to help teachers make full use of the educational tool represented by the school building, its furniture, and its equipment. Some illustrations from different countries and at different school levels are given to show how teachers have found constructive and imaginative solutions to the problems of adapting existing buildings in order to realize new objectives. Examples are also given of teacher involvement in planning new buildings, and furnishing and equipping new or remodelled school buildings. Methods suggested for increasing teacher participation in the planning and effective utilization of facilities are (1) including the relation to physical facilities in initial teacher training as well as inservice training, (2) involving teachers in research and development work on school buildings, and (3) having an initiation phase for teachers and other personnel occupying new buildings. (Author/MLF)