i have a single sink/vanity in my bathroom but i want a double sink. do i need seperate plumbing or can i run a T across to the new sink?

Question:

have a single sink/vanity in my bathroom but i want a double sink. do i need seperate plumbing or can i run a T across to the new sink? Answer: You should be able to cut in a tee. However, you should check with your local codes to make sure this is permissible. Also, the drain going down, should be 2" and the vent should be 1-1/2" this is also could vary depending on your local requirements.