I think that Ron's answer was a simple, yet good, answer. And so was OptionsRealty's answer. So to add to what they said I would suggest looking at the cost of construction (the price should be at least 30% lower than buying a pre-existing home), the type of material used ( is it SIPs, ICFs, Enviro-Bricks, Panelized, or just plain old stick and sheet rock?), and check and see if the Builder is a large scale neighborhood/community builder or just a General Contractor. I think this is relevant at this time because these large scale builders are filing bankruptcy after taking in deposits and half constructing some homes leaving behind literal "ghost towns" in their aftermath.
I noticed that checking their stock was mentioned, and though that is a good idea, it can also give you a false positive, so don't rely on that alone. The truth is you'll never know when one is about to fail. So take what Ron, OptionRealty, and I have posted and you should have a pretty good starting point.
Another point, when getting a home built you don't need any other players regardless of who pays. But in reality, if you look at some of the comments below, you will see that the person paying for everything IS YOU! All the builder will do is charge you to pay them, and your loan amount and interest payments increases by that much more. The main reason to build TODAY is to save money. And you save by cutting expenses. Think about it.
I hope this was of some help to you.