Almería was one of the most important cities in al-Andalus, a circumstance that was possible thanks to the strength of its port. Its foundation as an urban entity during the Caliphate of Córdoba originated a typical scheme of an Islamic city organized by a medina and a citadel, both walled. Subsequent city’s growths, due to the creation of two large suburbs commencing in the eleventh century, also received defensive works, creating a system of fortifications that was destined to defend the place during the rest of the Middle Ages. In this work we will analyse the construction techniques used in these military works, which cover a wide period from the beginning of the tenth century until the end of the fifteenth century. Although ashlar stone was used in the Caliphate fortification, in most of these constructions bricklayer techniques were used, more modest but very useful. In this way, the masonry and rammed earth technique were predominant, giving rise to innumerable constructive phases that in recent times are being studied with archaeological methodology, thus to know better their evolution and main characteristics.