I have to increase the floor level of my bathroom by 1 3/4 inches. I intend to put 1 inch plywood and 1/2 inch for the cement backer board. The tile is approximately 1/4 of an inch. The bathroom floor will then be the same height as the hallway. However, this means that I have to increase the height of the flange pipe by 1 3/4 inches. What is the best way to extend the height of the flange?

Tell us more about the current flange and drain pipe. If its cast or PVC there are "twist-n-set" type flanges that can be used be maybe posting us a picture would help us help you. Oatey 43654 Flange, Twist-N-Set, Closet, 3 In, PVC (http://www.google.com/products/catalog?q=oatey+twist+n+set+closet+flange&hl=en&prmd=ivns&bav=on.2,or.r_gc.r_pw.&biw=1675&bih=824&wrapid=tlif131286001275510&um=1&ie=UTF-8&tbm=shop&cid=2980759297850278800&sa=X&ei=g6dATp60BIPKsQLn88XNCQ&ved=0CFYQ8gIwAA#)