1 Opting in may put you on the hook for the upfront costs even if they decide to not start a class action.
2 Let them do the ‘inspection’ and give you a copy. ..Before opting in.
3 Code violations? Any current damages?
House seemed to work fine for 7 years, pass pre-purchase inspection and no realtor disclosed problems. Hmm. Like to know more about the actual problems driving this. Have you considered approaching the builder directly?
“The statutes of limitations are shorter than ten years for the following building standards found in California Civil Code Section 896:
Plumbing and sewer systems must operate properly and not materially impair the use of the structure by their inhabitants: four years from close of escrow.”