Wynstones school in Gloucester, a Steiner school which won exemption from some of the early-years foundation stage, has been described as excellent by inspectors.
The 274-pupil school had a three-day visit in November from the Schools Inspection Service - an independent organisation that is itself inspected by Ofsted.
They found the overall quality of the curriculum was good with outstanding features, with pupils having plentiful creative opportunities.
They also praised the pupils' personal development: "Pupils show high degrees of self-confidence but without arrogance or superficiality."
Ken Power, management co-ordinator and teacher at the school, said: "There is a lot of data, but it was not data-led, it was lesson led. They spent a lot of time looking at lessons.
"We didn't find Ofsted disagreeable, but they were scratching their heads (when they had previously inspected).
"These people (the School Inspection Service) made themselves more familiar with what goes on in a Steiner school."