Venting the unvented drain sytem

Is there a way to vent my unvented homes drain system without opening up walls

We were told that the drain traps are not in the proper place and that the drains are not properly vented. What do they mean? Can this be fixed by us and how do you do it? How long will it take?

Hi, this is my first post here and I appreciate any help you can give me with a plumbing project I have to figure out in my new old house. When we bought this 1890's house three years ago, it had a downstairs kitchen and half bath and a full upstairs bathroom. I remodeled the kitchen in July...

My house is roughly 60 years old. The kitchen sink drain was never vented, it is approx 2" pipe that runs straight into the floor no vent going up. The sink drains fine, never a problem. I want to put a bar sink in my basement and this is the only drain I can tap into. It would be approx 20...

I recently purchased a house (35 yr old) in which the kitchen sink vent was removed (it was completely clogged). The plummer installed a mechanical vent for the sink drain. That works fine for the kitchen, however when a toilet is flushed, water actually backflows into the kitchen sink. I am...