Installing a false wall in the bathroom

Can I get a false wall installed in front of a horizontal large waste pipe to encase it thus moving a toilet forwards in order for closed back toilet? At the minute, the toilet and the pipes are in a "nook" in the bathroom between a wall partition (which contains pipes) and the bath, and of course cistern pipes come from the partition. And could bathroom fitter with plumbing experience do this on their own? Or would they bring an extra person to do it?