There's a few free ones about - but just be careful not to design something that's not actually doing to work ?! Soil pipes and plumbing can sometimes be less movable than you think ?! So get your design feasibility tested before you get your heart set on it ( or before you order anything !)
Thanks one plan. Any recommendations for good ones? Not going to use it to order anything, we have a number of possible layouts with different options to move walls, want to be able to send options to plumber to get accurate quotes. Could draw it but hoping for a better way!