I am looking for a way to include 3d home design software on my page.  I know the software exists, but to put in on my page would I have to create the software myself, or is it possible to pay to use someone else's software? 

I am looking for a way to map out an existing room of a house (like a kitchen).  Then layout what fixtures, fooring, table tops one would want and then provide a quantity of everything placed.  If I have to pay to have someone do this, would anyone have any recommendations on who could do this and how much it might cost.

Can you elaborate in detail what exactly you have been looking for? You want to have 3D software like website builder where users can create website and see the instant impact ?  One possible way to achieve this with use of embedding frames if specific software allow you to have it in your website. Many online service provide facility to embed different tolls for 3d design to your website.