As of yesterday, April 4, it is possible to deal with buying and selling real estate by videoconference. The videoconference sessions are done through a new digital platform, which allows documents to be sent.

Acts that were only possible to be performed at a notary, may now be done by videoconference, as of April. However, this is a temporary regime and will be in effect for two years.
Besides providing greater flexibility in authentic acts, it helps with physical displacement.
Learn more, according to an article by Caixa Geral de DepĆ³sitos.

According to Decree-Law 126/2021, the rules applicable to the performance, through videoconference, of authentic acts, terms of authentication of private documents and acknowledgments, published on December 30, 2021, came into effect on April 4, 2022.
This legal regulation is temporary in nature, only to be in force for two years. At the end of this period it will be “subject to evaluation by the Government”.
Until now, acts such as the process of deed of a house could only be performed before a registrar, a registry officer, a notary, a Portuguese consular agent, lawyers or solicitors.
With the new legislation, the physical presence of all intervening parties is no longer required. According to the government, this is also a way to continue to address the growing demand for online public services that has intensified with the pandemic.
For this purpose, a proprietary IT platform was created in order to certify all the process’s security. The management of the platform is the responsibility of the Institute of Registration and Notary Affairs, I.P., in conjunction with the Institute of Financial Management and Equipment of Justice, I.P.

Authentic acts, notarization of private documents and acknowledgements included in this new regime will be able to be made through a computer platform created for this purpose and available at justica.gov.pt.
To enter the reserved area, users will have to authenticate themselves using their citizen card or digital mobile key. 
In addition to accessing the videoconference sessions, users can use the platform to send and consult documents, consent to audiovisual recording of the proceedings or consult the history of the proceedings in which they were involved.
The realization of these acts by videoconference always depends on prior scheduling.
After scheduling the day and time, a message is sent to the respective intervenients to the email address indicated by them, with confirmation of the appointment and the link to the videoconference session, as well as the amount and data for payment of the fees due. 
The intervenients may be accompanied by a lawyer or solicitor (in person or remotely). This reference must be included in the documents drawn up.