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Yes, a toilet, sink, and shower can share the same vent. This is a common plumbing practice that can simplify installation and save space. When sharing a vent, it's important that the toilet is located downstream from all other fixtures. You will also need to ensure the vent pipe is large enough to handle the demands of all connected fixtures without compromising its effectiveness. Because requirements can vary, you should always check your local building and plumbing codes. Consulting a qualified plumber is recommended to ensure the vent is properly sized, installed, and adheres to all local regulations.

A standard toilet flange should fit snugly into the outflow pipe and sit level with the subfloor. Installing a new one without first removing the old one will make it impossible to form a seal and keep the toilet bowl bolted securely in place. 

However, if you’re dealing with leakage or wobbling because you’ve installed a new type of bathroom tile (making the floor taller), you may be able to avoid fully replacing the flange by opting for a toilet flange extender. Extenders typically come in kits for easy DIY installation, fit over the existing flange, and bring the drain connection higher.

To avoid the high costs of plumbing repairs, watch for potential problems. If you see any signs of a leak, consider hiring a professional plumber. A pro can assess the level of damage and make the appropriate repairs.

Plumbing leaks are always better tackled immediately. You can also fix any minor repairs yourself or ask the plumber if they can use less expensive materials.

According to the Uniform Plumbing Code (UPC), the distance between your trap and the vent should be no more than 6 feet. For your vent to work properly, it needs to feed into the drain line within 6 feet of trapways that connect to it. Using this formula, you should be able to determine whether you will need multiple vent lines.