Oh, and I'd also agree that Zillow is irrelevant in these types of issues.
Find someone to negotiate on your behalf. Your interests will be served, and you can end up getting a great deal!
Zillow has no bearing on what you should offer. In various markets they are within 10% only around 1/3 of the time. Working with builders is interesting and requires different strategies to be successful. First, do you have your own agent? If not, get one. The very nice and friendly agents on site work for the builder and by contract have to put the builderâ€™s interest first.
If you don't have an agent, interview a few and make sure you have one with successful experience dealing with new construction. I have various strategies that work well, meeting both their interests and of course getting something extra out of the deal for my client.
If you have been using the builders agents, and they have a registration policy that will not allow you to bring in your own, call me and we can discuss some useful approaches. Best of luck with your purchase.
All the previous answers have given you very good advice. Many buyers looking at new construction homes are asking the same questions. The key, as mentioned, is that the builders agent represents the seller, not you. Some think that by going directly to the Seller and their agent they will get a better "deal". This is not necessarily the case. If you do decide to interview agents for the job of representing you and assisting you in the complete process of making an offer and purchasing your home, I'd be happy to meet with you.
As to what you should write your offer for, again I would recommend you work with your agent, and, if you don't have one, I would strongly encourage to you to get one. The listing agent is not working on your behalf.