SC has their own code book. It’s based on the IRC but with many amendments and omissions
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As does most every state with a large population center, usually with multiple large cities.
Why?
Simple… Revenues from Building Permits, Property Taxes, etc. The more control these centers have over you, the more money and power they have, the more control they have over you, and so on, and so on, and so on…!
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I’m ok with that. The revenue trickles down to me 
Everyone pays for permits, taxes etc regardless of a state code.
I appreciate everyones advice and quick responses. After some more research I found out that the builder uses GAF shingles and found a technical advisory bulletin you can read below.
https://documents.gaf.com/technical-bulletins-&-notes/r-141-drip-edges-and-shingles.pdf
Basically GAF requires drip edge installation when local code requires it, but strongly recommends it be installed on all asphalt shingle roofs. I shared this information with the client so they can make their own decision.
Seems to be a major grey area when local code is based on manufacturers requirements, but manufacturers requirements are based on local code. In the future would it be better identify the lack of drip edge as marginal versus in need of replacement or repair?
Just report what you see.
Also comment any reason why you believe it may be problematic.
The client will then decide if it is an issue for them and how important it may be to them.
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Not required but recommend
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A lot of new construction comments fall under “may not be required, but is recommended by manufacturers.” I think it’s a good way to force builders to effectively say “we’re being cheap/lazy” instead of touting how they meet code.
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