They come out every 3 years but many states use old versions So you need several. You also need to buy the addendums. I don't pay anything for my online service. I am a member of the International Building Code Counsel and can submit and vote on new codes and exceptions. That may be why I get my online for free. If anyone needs to have something looked up in any of my 7' rack of code books residential or commercial I'm happy to do that for you. Except California. I don't do work there.

Old enough to know better, too young to resist.