Real Fábrica de Cristales de La Granja

In that year, funded by the crown, the Catalan artisan Ventura Sit installed a small oven which manufactured float glass for the windows and mirrors of the Royal Palace of La Granja de San Ildefonso, which was under construction in the 1720s.

Sit had previously worked at Nuevo Baztán where a glass factory failed because of inadequate fuel supplies.

At La Granja there was an abundant supply of wood for the factory in the Sierra de Guadarrama.

According to their origins, up to three glass factories were established: Spanish, French and German, as well as different workshops and a general warehouse in Madrid.

The Ministerial Order of 1989 was formalized by law in 1994, its basic objective being “the promotion, development, education, research and dissemination of craftsmanship and history of glass manufacture artistic and other cultural and scientific activities related to art and art glass.”[6] The Glass Technology Museum is located in the old Royal Glass Factory, the only factory building that is currently preserved in the Royal Site, designed in 1770 by the surveyor, Joseph Díaz Gamones, and built outside the walls of the Granja, with a basilica plan facing South and two large, new brick domes over the melting furnaces, instead of the old wooden frames that caused fires.