Often I get DWG plans from architects which have a lot of overlapping lines, meaning lines that sit on top of each other but don't share the end points, one is longer than the other. Curvs to surf command gets confused by this and it doesn't produce a good polygonal model. How to deal with this issue prior to curvs to surf command. I can fix this individualy with trim or sometimes the bool command but I need a method to fix this globally for the entire plan.

Hello Boris.
I am sorry I totally forgot to reply your post

Please link the object with problematic floorplan here, or send me it to email in case it is confidential project.
I will test it and write here the best workflow.

Here is one isolated problem I have with the AutoCAD data I receive from the clients. Many of the lines are redundant overlapping lines. How do I deal with them ? The goal is to use curvs to surfaces command in the end but with such problems the command does not produce a clean mesh.

Even bigger problem are overlapping curves.

(I am not sure how to upload the object, it doesn't seem to post)

Please send me the object to email.

Regular procedure to fix problems with floor-plan.

1. Use Boolean 2D with intersection mode. (this will cut overlapping lines)
2. Use Join. (this will remove all redundant segments and connect all remaining segments into proper network)
3. Use Analyze tool with Show problem: Loop Disconnections. this will show you where are unwanted disconnections and you have to fix them manually.