The design was developed using an existing outline design provided for the tender process. One of the key factors contributing to the project's success is the design of the different areas and routes covered by the tram. The right of way was defined in the outline design. This selected route allows for a high number of users, who are provided with a transport link to and from areas of high demand.

The first 15 months of the construction phase were financed directly by the Project Company's equity investors, with some funding also provided by the Procuring Authority during these initial stages. The delay in reaching financial close is discussed in more detail below under the heading "Key Events".

The programme for construction anticipated two years for the first construction phase and another two years for the second construction phase. Substantial completion of the first phase of works was achieved six months in advance of the date for final completion for that phase, with only minor works outstanding. At that point, as substantial completion for the first phase had been achieved, tram operation for the first phase and the corresponding milestone payment was made to the Project Company.

The construction phase also involved significant effort by the Procuring Authority and the Project Company in stakeholder management. Civil works in urban areas are complex, affecting a large number of public services and causing disruption to the daily lives of citizens and businesses in the area. To manage these public relationships with stakeholders, the Project Company employed a specific communications director. There were also information offices set up in several places around Zaragoza, so any individual or business could seek information about the project or any issues arising related to the construction phase.