Can I get the final effect through 3d rendering when decorating my house?

I have no experience in rendering a house with software or building one from scratch so I may be completely wrong. I think that you could get an idea about the decorating from an architect firm. You do see many tv shows that show plans and representation of the final with decorations and such. From what I can tell they all come from an architectural firm. If you are using one already you should be able to sit down with them for this. If only your builder is working with an architect firm, then I'd tell your builder what you are wanting and to put you contact with the firm. I don't know if there will be an additional charge or not for such but if it's something you really want it may be worth looking into.