Yes. As a general rule, you should plan to order 10% more flooring than is needed for the installation. Much of the material will be cut to fit the exact space, and once the boards are cut, they likely cannot be used elsewhere in the room because the end tongue or groove will have been removed.
All wood flooring, will need to be delivered to the job site and allowed to acclimate for a period of time before the installation can begin. This can take several days depending on the material being used.
Use caution when installing hardwood flooring in a kitchen. A kitchen is prone to food and liquid spills which can raise the wood's grain or permanently stain or damage a hardwood floor's finish. Be sure to wipe up spills immediately with a dry, clean cloth.
Engineered wood floors can be glued down or floated over a dry, clean, fully-cured concrete slab that is on or below grade. If moisture or humidity is very high at times of the year, perhaps a non-wood flooring option would be a better choice.
Unfinished hardwood is installed in your home before the finish is applied, which can be matched to existing / surrounding hardwood floors. Prefinished hardwood is stained and sealed by the manufacturer prior to installation.