SmartDraw allows you to specify the level of precision in your floor plan.
For architectural scales, the default level of precision is 1/16 of an inch, but you can get as detailed as 1/64 of an inch.
To set your desired level of precision, click on Precision under Units & Scale located in the Document Setup section of the SmartPanel to the left of your workspace.
For metric scales, you can specify the number of decimal points you want. First, set your scale to a Metric option and then bring up the Precision drop-down to set your level of detail. The default is set to two decimal places, but you can specify up to 6 decimal places if you need to.