Poor overall planning leads to overcrowding in preschools. Ample space and a low teacher-child ratio in activity spaces are crucial. This paper investigates and proposes improvements to the overall planning quality of 26 Malaysian public preschools in Klang Valley. Four planning aspects were assessed (building size, size of indoor activity spaces, enrolment and quality of modules) using the Children’s Physical Environment Rating Scale. Most preschools were too small and the average planning quality of the studied preschools was only rated Fair. Design recommendations discussed in this paper will help designers devise better planning for Malaysian preschools in the future.