Children, staff and parents at North Walsham Infants School and Nursery held a triple day of celebration, combining an official opening, art trail and picnic.
The Manor Road school invited along store manager Rob Wilkinson and staff from the local Sainsbury's to watch town mayor Dave Robertson cut the ribbon on a new outdoor classroom.
Supermarket staff raised �2,555.78 for the school after adopting it as its local charity last June and the money will help pay for the new building, christened the 'daytime den' by pupils.
The ceremony, on June 1, coincided with the school's Diamond Jubilee celebrations which saw families gather on the school field for a picnic, maypole dancing, singing and the chance to visit a pupils' art trail. Children had made models and sculptures to show the public.
The events were also a chance to celebrate the official federation on June 1 of the governing bodies of the infants and neighbouring North Walsham Junior School.
From September they will be joined under one executive head teacher, Clare Fletcher. The move coincides with the retirement of junior school head, Ruth Brumby.
Mrs Fletcher, who is currently head of the infants' school, thanked Sainsbury's for their support and said it had ensured a fabulous new resource for the school and a lasting legacy of a unique partnership.
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