No. In Catalonia, economic activity often falls under different regimes such as a licence, a responsible declaration, or a prior notification, depending on the type of activity and its level of impact.
It depends. Law 39/2015 regulates administrative silence, but in urban planning matters, rights or permissions that are contrary to applicable regulations cannot be acquired through silence.
Review the administrative act quickly, the authorising permit, the reasoning provided, and the applicable planning regulations. In this area, waiting usually makes the problem worse.
Yes. Law 39/2015 regulates administrative appeals such as alzada and reposición, and the Administrative Jurisdiction Act (LJCA) allows you to bring a judicial review claim against express administrative decisions.