In spite of the widespread adoption of policies on mainstreaming, and more recently on inclusive education for children and young people with special educational needs, little is actually known about the relationship between what teachers think about such policies and the type of learning environments that they provide. In this study in New Zealand, a sample of regular primary school teachers (N= 63) were categorised according to "high", "moderate" or "low" scores on a scale which measures their views on mainstreaming policies and practices. The pupils (N= 1729) of these teachers also completed a scale measuring perceptions of their classroom learning environments. Children taught by teachers who espoused highly positive attitudes towards mainstreaming were found to have significantly higher levels of classroom satisfaction and marginally lower levels of classroom friction than children taught by teachers with less positive attitudes. Implications of these findings are discussed for further research on the role of teacher attitudes in the successful inclusion of children and young people with special needs and for policies on the implementation of effective inclusive practice.