None of these is an obstruction placed by anyone in the transaction. They are the administrative shape of Portuguese property.
Consulting the approved project held by the Câmara Municipal, or obtaining a certificate about a building's licensing history, follows each município's own procedure and its Regulamento de Taxas. Some concelhos answer in days. Others schedule a comissão de vistoria first, and the visit is placed when the visit is placed.
Where the Caderneta Predial and the descrição predial disagree on area beyond tolerance, correction becomes mandatory before a clean sale. The sequence is a topographic survey, then rectification at the Autoridade Tributária, then rectification at the Conservatória, which accepts the change only once the updated caderneta exists.
Where the property sits in an urban rehabilitation area, public entities hold a definite period to exercise or waive the direito de preferência through Casa Pronta. A tenant of two years or more holds a separate period, counted from receipt of the notification rather than from its dispatch. These are periods, not queues.
A signing date set inside a week is a decision to sign before these three can return an answer. Starting them on day one is the only lever a buyer holds, and it is worth pulling before anything else.