Buyers are willing to pay $$$ for additional flexible spaces that can be used as office, gym, guest home for elderly parents or adult kids, or simply as rental to help pay off the mortgage. 

Is there any action I can take here, or do I simply chalk it up to a learning lesson and don't let it happen again?

However, usually the problem is that the only clause in the builder's contract is a force majeure (act of god). 

So correcting this error is a relatively simply manner. 

Simply the cost to repair the damage, backed up with the handyman's invoice as part of the move out and security deposit refund flow.

My guess, with 9.1 being so close is that they simply will get further behind though.One avenue to explore, but that can sour a relationship is to see what other bills they have.

No matter if they do that or not, you should of course reach out to provide simply and clear directions and information. 

just like our peaceful protesters LOL  looting  breaking windows  its simply a government problem no back bone. 

Simply because we grow our brand/market share twice as fast, that's it.

Some time spent searching through posts or using the search function could bring up plenty of them.For contracts in CA, I suggest you simply get a PSA (purchase and sales agreement) from any agent.