Some builders use a risk formula to determine the percentage down required for the new home.
The price point of your new home might be a factor with regard to the down payment.
If you own or buy the lot, the development might require certain builders to build in that development. If you own the lot free and clear a lender might be able to use a portion of the lot equity as part of your downpayment.
There are too many variables to provide you with a clear answer.