The difference between designing and decorating a home explains it. You know you need a professional designer to help implement deeper changes to a home, while for easier changes you can work with an interior decorator.
The same with feng shui. A good feng shui design means a house is build with a good flow of energy in mind; it has an intelligent, nourishing flow.
A well designed feng shui house has no:
- Front door aligned with the back door
- Bedroom above the garage
- Bathroom above the front door
- Staircase facing the main door
- Bathroom over the bedroom
Some of the results of bad feng shui design are easier to deal with than the others. For example, while you can sure bring air-purifying plants and invest in smart lighting - maybe even full spectrum lighting - you cannot easily change the effect of a bathroom over the bedroom.
To conclude, feng shui design is the process that goes into the initial stages of building or renovating a house, while feng shui decorating can be done at anytime by using appropriate feng shui cures.