There are no costs to you as a buyer to use a realtor with a new home build. I really do not see any disadvantages while the advantages can be in negotiating a price or extras being thrown in.
Most people are capable of negotiating a price but some just don't feel comftorable doing it. The more I work with a builder the more reputable I become with them which can also help out in passing savings onto my clients.
Pm me if you want some more info!
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