To install Quick Plan choose edit > preferences > add ons > install > choose downloaded zip file. To enable it for future uses click icon on the bottom corner and then save preferences.

How to start building floor plan?

First we need create plane as basic shape to work with. All edges on the plane would be turned into wall when we press "quick wall" or "shear wall" button, make sure the basic plane is selected. Apply rotation and scale on the plane by press "ctrl+A' > apply rotation and scale, this required to make wall scale work correctly.

"Quick wall" will automatic create wall and column, it's also generate new collection called "wall". 

"Shear wall" is used to create non 90 degree wall.  

How to create dimension?

To create dimension simply select the basic plane and then press "quick dim". 

How to update dimension?

Select dimension line, go to edit mode and drag selected vertices to desired location then press "update dim". Snap to vertices will help this process.

How to add annotation?

Select the basic plane and then press "Quick Annotation", it's will generate Blender text to help on creating name of the room. 

How to export to SVG file?

Choose your destination directory, make sure relative path is uncheck, this add on need an absolute path of the directory. After we got destination directory then press "export SVG" button. 

This add on will create file "quickPlan.svg" to the target directory.