I had my home built almost a year ago. I was able to install all of my inwall speaker wire where ever I wanted. Make sure its UL rated in case you have an inspector that really cares. I personally used(12 gauge) Kwik 12 from Kimber Kable. I would recommend the use of 12 gauge for everything. Visualize where you would have speakers in each room. Be set up for anything in the future. Its easier to run your cables now!!

Take pictures of where you ran your cables, so you can reference them later.