Can I use an agent for a new home?

Yes, however buyers should be aware of the differences inherent in working with sales agents who are employed by the developer, rather than traditional real estate agents.
Builders commonly require that an outside agent be present, and sign in, the first time a prospective purchaser visits a site before payment of commission even is discussed. At times when buyers use an advertisement to find the development themselves first, builders can refuse to pay any commission regardless of how helpful an agent may become later in the process. It is advisable to call the development first and inquire about their policy on compensating real estate agents if you are using one.