Best practices question

[cellophane]

We use SketchUp at work quite a bit to give clients renderings of different building options - showing different facade features & colors (parapet vs. no parapet, brown vs. black) and have been doing it with different models which the more I go about it the less efficient that seems. What would be the best way to go about doing this? Our output is usually images for the client and a quick animation.

I apologize if this has been asked. I skimmed the forums but didn't see anything and am not sure how best to search for the topic.

Thanks!