Teachers are more likely to include children with developmental needs (DN) in their classroom when they perceive that important people around them, such as principals, colleagues, and parents of children with and without DN, endorse inclusive education. Adequacy of resources and availability of training opportunities may also affect how teachers perceived being supported. This study examines Singapore preschool teachers’ perception of support received from their working environment to include children with DN and how this predicts their intention to practice inclusive education and self-reported implementation of inclusive practices in the classroom. The original Perceived School Support for Inclusive Education (PSSIE) scale, developed in Bangladesh, was reviewed for relevance and clarity by a panel of six experts familiar with Singapore preschool inclusion. 211 preschool teachers in Singapore completed the new 11-item revised PSSIE – Singapore Version online. Perceived school support was found to be a single construct that significantly and reliably predicts both intention and self-reported practices (alpha = 0.929). Stakeholders in Singapore can now use this newly validated instrument to reliably understand the support received by teachers and to re-examine the strategies provided to support preschool teachers in this journey towards quality inclusive education.