Knowing a little bit about the types of grass can make it easier when negotiating with sod layers, and the type of sod that's best for a lawn depends on your region. If you're in New England or the Midwest, Kentucky bluegrass might be right, but zoysia or centipede grass might be better if you're in the American Southwest. Compare and contrast the different types of sod before you call in the pros.
Laying sod doesn't require a license, but your town, county, or homeowner's association may have regulations regarding the laying of sod in your area. Learn about any extant regulations by contacting your local government or quiz any sod installation services you're planning to work with.
Laying sod perfectly isn't easy, and if the company you want to work with has a history of making mistakes, you should find out. Ask for referrals from previous customers when you talk to a company you might want to work with, and don't forget to check out the local customer reviews.