I do quite a lot of these type Inspections. In Dallas, new does not equal anything near perfect, dont know what it's like in CS. Quality control is non existent for the most part and I find serious issues all the time.
Yes, you are at the mercy of the builder's warranty attitude and if they suck, there isn't much you can do to fight it reasonably. But you are still better off knowing about the issues than living blindly and ignorantly and being surprised later. I actually find that most builders are not terrible about fixing the big things when they are on the report. I think a lot of them are not trying to suck, the process is flawed and they will try to make the client happy if they reasonably can.
If you did not have it inspected before moving in, you should seriously consider having a warranty inspection done. I see it as a reasonable hedge. Yes I make money on them, but I could never sell something I didn't believe in.
As with all things, not every inspector is equal. Make sure they have thermal imaging (actually have a decent imager and some experience, not just a cheap one that doesn't do anything because of crappy resolution and sensitivity.). Ask what model they use, that will surprise them, and I can tell you if it is reasonable. Also ask specifically about the roof. You would be shocked how many inspectors NEVER walk the roof and ALWAYS inspect it from the ground with binoculars. While inspecting from the ground is allowed by TREC for safety, at this point there is no excuse for an professional nspector not to have a drone license and use that to get around the safety concern. I always either walk the WHOLE roof or I fly the drone, around Dallas, where I am, I would say I am flying the drone 90 percent of the time. Only exceptions are when it is unsafe to walk AND in a flight restricted area (close to an airport or close to the XPOTUS residence.)
Ask about these things, don't assume. Your quote is not unreasonable assuming an experienced inspector that uses proper equipment.
