Does a second toilet need additional venting?

Yes, a second toilet typically requires additional venting to ensure proper drainage and prevent sewer gases from entering the home. Each toilet should be connected to the Plumbing system's venting to maintain air pressure and facilitate the flow of wastewater. In some cases, existing vent pipes may suffice, but it's essential to consult local plumbing codes and a professional plumber to determine the specific requirements for your installation.