The construction site is already set up next to Campo Grande station, on the Telheiras side, where a garden will be created in the future.

The construction site had already been set up in a vacant lot in Telheiras next to Campo Grande station, but on Wednesday, December 22, the slab was uncovered. This formalized the start of work on the Circular Line in the Campo Grande area, which will connect the current Green and Yellow lines and extend the station.
To allow the Circular Line to operate, the existing infrastructure in Campo Grande will have to be changed. Telheiras will now be connected to the Yellow Line, which runs to Lumiar and Odivelas. The line that comes from Alvalade today will have to move on to Cidade Universitária. These changes will require the construction of two new viaducts on the west side of Campo Grande stationover Rua Cipriano Dourado and Avenida Padre Cruz.

The new viaducts will make the necessary connections, but the old viaducts will be maintained. This means that in the future, when the work is finished, the current Green Line will be connected to the current Yellow Line and the current Yellow Line will be connected to the current Green Line, so in theory it will still be possible the idea of a "looped line" of Coins.
To the east, Campo Grande station will be extended by 16.5 meters, with a useful width of 2.9 meters for passengers. This extension will be made by advancing the current building over the public space - it will be a reinforced concrete structure disconnected from the existing station and viaduct structure. In order to achieve possible formal continuity between the interior space of the existing station and the extension to be built, the same stone will be used for the paving of the quay extensions and the lining of the walls.

The contract for Campo Grande was delivered to the "Viadutos do Campo Grande" consortium, formed by the companies Teixeira Duarte and Somafel, and has a contract price of around 19.5 million euros. Completion is scheduled for the first quarter of 2023. This work is Lot 3 of the works that will give shape to the Circular Line, which will mean an extension of the Lisbon Metro network by more than 2 km and two new stations (in Estrela and Santos). The entire Circular Line is scheduled to open in 2024.
Lot 1 - referring to the construction work between the end of Rato station and the future Santos station - is already underway, with excavation work taking place on the various fronts and the adaptation of the former pharmacy building of the Estrela Military Hospital, where the access to the future Estrela station will be located. Lot 2 concerns the Santos station and its connection to the Cais do Sodré station and is further behind schedule; according to Metro de Lisboa, it's already underway. "The Environmental Compliance Report for the Execution Project (RECAPE) for this lot is being finalized and will be sent to the Portuguese Environment Agency". Finally, Lot 4 has to do with the finishes between Rato and Cais do Sodré and is currently out to tender.

The alterations to Campo Grande will mean some changes to the public space. The wasteland in Telheiras now occupied by the construction site will, in future, be known as the New Telheiras Garden, a Lisbon City Council project that resulted from the Participatory Budgeting 2016 and which will have to be made compatible with the intervention that the Lisbon Metro will be carrying out on the site. This intervention will consist of a new access to the garages of the Torre Vicentina residential building, a reorganization of surface parking, new pedestrian sidewalks and the restoration of the cycle path "in poor condition".
