We examined 25 four-year-old pre-school classrooms from a random sample of 15 schools within a large urban city in southern Spain. Observational measures of classroom quality included the Early Childhood Environment Rating Scale-Revised, the Classroom Assessment Scoring System and the Observation of Activities in Pre-school. Findings revealed that, on average, classroom quality was low in regards to space and materials, developmentally appropriate activities and instruction; however, classrooms were relatively high on positive climate and productivity, and teachers demonstrated positive relationships with families. The observed ratio of children to teachers was high across classrooms. Results from regression analyses indicate that a higher ratio was associated with lower quality language modelling, teacher feedback and personal care routines available in these settings. Qualitative data from teacher interviews highlighted the importance of a pre-school education for children's development and school readiness, but also emphasised the challenges teachers faced with the new government-subsidised, universal pre-school programme, including increased class sizes and a lack of staff and resources. Implications for maintaining high-quality programme standards are discussed. (Contains 4 tables and 2 notes.)