Where can I get my home cad plane, to the property or online?

The property must have an original structural drawing.

If there is an electronic version, try to have an electronic version, so that you can design directly.

If there is no electronic version, you need to draw the original structure diagram on CAD according to the drawings.

Friendly reminder, there will be some errors in the original structural drawing provided by the property, so it is best to measure the house yourself for the convenience of future design and decoration.