Giesinger started as a garage brewery in Munich-Birkenau in 2006. In 2007, 300 hectoliters of beer were produced and sold in Birkenau. In 2009 they already produced an impressive 750 hectoliters of beer in their small backyard brewery. When they finally reached the magic limit of 1,000 hectoliters for the first time in 2011, the premises in Birkenau were completely exhausted. A new location was needed and found in the neighbourhood of Munich-Giesing. The new brewery opened in 2012 and continued to grow, therefore a second facility was opened in 2018. Today they have 20 fermentation and storage tanks in their brewery. Giesinger became Munich's second largest private brewery almost overnight: With their current brewing plant, they can produce up to 12,000 hectoliters of beer per year, and after the opening of the second brewery even more.