The architect will recommend specific construction materials and building requirements to the contractor. Sometimes these requirements may add to the cost of the project, but are done to provide structure integrity and eye-appeal to the finished product.
The architect or architectural firm may also coordinate the various aspects of the project from getting utilities to the site through to making sure all the finishing touches are in place. Understand exactly what the arrangements are for these services, don't assume the architect is completing them.
Study various types of architecture before making a decision. Some styles of architecture simply don't match specific plans and designs, allow the professional you choose to give you pointers and ideas, but ultimately you will make the final decision.
