Well first of all youdo not need to pull up the existing vinyl floor if it is a full spread glue down. (you can check this by cutting out a square of the vinyl floor) However you do have to prepare the surface of the vinyl by cleaning all the residue off of it, and then roughing it up with a heavy scratchpad, or a drywall score. Then you can lay your tile.

Hope I have helped.

scrape up the existing vinyl if it is not older than 20 years old, and level the floor. I know this is more work, but I believe most Ceramic installers will tell you to do the same. I am looking forward to the feedback on this.

Thank you for your replys. We have a lot to think about. I will gladly send out a note to let you know how it goes. I would like to also hear from more people before we attemt this project. Has anyone ever tiled over a vinyl flooring and hasn't regreted it? Our home is less than 4 years old. Again many thanks!

i agree with the post from graham flooring ,when you tile over vinyl that's well down, all you have is a moisture barrier... good luck