Construction still in progress around you can be a nuisance. There is noise and dust to contend with, as well as access problems. New homes are rarely completed on time, which can present logistical problems for buyers who are selling one home in order to buy another. The best way to deal with the completion time factor is to reserve the right to rent back your current home if you need to. This way, you can avoid having to move to interim housing if your new home isn't completed on time.
New homes are often pre-sold before they are built.
The developer usually hires professional decorators to furnish model homes that display the various floor plans offered in the development. However, model homes rarely depict the standard finishing details you can expect to be included in the price of your new home. But model homes used to sell homes in a development are usually enhanced with upgraded finishes. So the glass front cabinets in the model kitchen you fall in love with might not be included as a standard finish in the price of the home. You may have to pay extra for this.