The houses under construction are located in a pine forest area in Muda, between Grândola and Carvalhal, in the district of Setúbal.
A source from the Comando Sub-Regional Alentejo Litoral stated that three homes were destroyed and another suffered damages, with no injuries reported.
The alert for the fire was announced at 04.14 am on 5 March.
At 7.28 am, 12 operational personnel remained on site, including the Bombeiros de Grândola and the Guarda Nacional Republicana (GNR), with the support of six vehicles.