You should definitely consider hiring an architect even for a small modest project.  Many architects will provide a no cost initial consultation, so it does not hurt to meet with an architect to see how they can be an asset to your project.   Architects bring peace of mind and significant value to a project through their abilities to: get more out of a smaller space, suggest cost saving strategies, and to reduce the potential for costly change orders.  Don’t overlook the value of good planning; planning is key and a well-designed project saves headaches, time and money.