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(F)OSS 2D floor planner
(sh.itjust.works)
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I have used inkscape for this purpose and it can be effective. The display units can be changed in the preferences (inch, cm, etc) and basic shape dimensions input directly. You can input absolute position for shapes and nodes, but I didn't notice an easy way for relative position. They also have a path effect called "Measure Segments" for that functionality. FWIW, I later preferred blender, but I might try a dedicated tool like LibreCAD mentioned in another comment. They seem to have decent documentation and a wiki.
Interesting. Maybe someday I'll try blender and/or librecad