Columns of circular openings help to shade the windows from the strong sunlight, but are too small for wayward balls to easily get through. They cast polka-dot patterns of light across the exposed concrete interior.
Behind the perforations, anodised aluminium frames surround tall windows filled with safety glass – offering additional protection from breakage.
The southern Spanish city is famous for its Medieval and Moorish architecture, in particular the hilltop fortress Alhambra – which is set to gain a new visitor centre by Álvaro Siza.
The new block sits between the existing buildings and the sports court of the 50-year-old school building, which has a traditional terracotta tiled roof and hosts 250 students under the age of 12.
The new wing has a smaller ground floor containing a classroom, which allows space for a covered entrance to the sports court from the main building. The larger upper floor is left unpartitioned as a multi-use space.
"The building was in need of a new flexible multipurpose space, and a second stairway for security reasons," explained the architects.
"The rules of the game were very clear: there was very little money, two months in which to build, numerous building and other regulations, and the goal of energy efficiency."
The structure is made up of a double layer of reinforced concrete, which was devised by concrete specialists Elesdopa to be built without formwork.
The decision to leave the concrete construction exposed was influenced by budget constraints – the entire project was completed for €81,750 (£59,000).
"On the outside there is nothing but concrete; inside, just concrete, and nothing but moving light and space to grow up in," said the studio.
Photography is by Fernando Alda.
Architect: Elisa Valero Ramos
Collaborator: Leonardo Tapiz
Client: Patronato San Juan de Ávila
Building surveyor: Isabel Álvarez
Constructor: El Partal