Remedies that are added after the building is built are the most common use of Feng Shui in western countries (or anywhere outside of Asia).
Its not to say that the Chinese dont do this when they have their consultation... its more to say that the Chinese usually check into the Feng Shui of a building before they occupy it (or for that matter before they buy it or rent it) and this gives them a distinct advantage.
I think the main reason why it happens is because in Asia, everyone understands how Feng Shui is used - its been in their culture for thousands of years. When Chinese use Feng Shui they want to know the potentials a Building has to offer (according to the Flying Stars horoscope). For instance, where are the two prosperity stars and are they well placed or naturally activated in the building. Are there bad energies in the building that could harm them. These are important things to know in Feng Shui. Knowing the good, bad and ugly of your building is very empowering because it gives you the tools to set about working out how to make it all work... Since Feng Shui helps us to create a good destiny, this is very worthwhile.
Outside of Asia, the same level of understanding is not as available. Many Westerners dont realise the potentials Feng Shui and the Flying Stars has to offer and they are reliant on what their Feng Shui Consultant practices. So if their practitioner doesnt know the potential... then we become limited by what they know. In the end, this results in people not using Feng Shui to its maximum benefit.
Ultimately, this secondary position means that people who really want to change their lives, miss really significant opportunities when it comes to wealth creation and they become limited to wealth restoration instead of being able to approach Feng Shui from the vantage point of wealth creation.
Having said that, Feng Shui Remedies added after the fact can still fall into the "substantial" realm in Feng Shui.
Make no mistake, remedies added after the fact can be very powerful even if there are some very large defects in the building. If anything, adding the right simple Feng Shui remedies after the fact will be be the thing that can correct these defects. BUT... to assume that EVERYTHING can be fixed and "cured" by adding a little something here or there is just sheer ignorance. Please dont let yourself do this because it misses an important point: which is to come into harmony with everything around you and be the Master of your own Destiny...
Wealth Creation is a powerful place to be in Feng Shui and Wealth Restoration is definitely the secondary space. If you're in the position of building, renovating or remodelling something within your home, office or workplace... the most powerful thing you can do is get it checked out before you do any of this work. Not only can you create a more prosperous future, but this approach will make you powerful as well!