Removal of existing flooring, if necessary. In addition, the surface finish, and corresponding warranty, along with the overall product warranty will have an impact on price. The actual species of wood can affect the pricing, i.e. maple is more expensive than oak. Maybe - maybe not. It really depends on what you need .
Every home has a different traffic pattern and usage level.
That is the most general statement that actually means something. We have our own crews do our installations. If you believe nothing else - believe that this is safer for you. It may cost a little more - but well worth it. Once it's installed, you don't want to have to remove it - it's a dusty mess.