Consistency is important for the overall layout and design of a web site. Not only does it address identity issues, it sets user expectations for organization and function.
For each web page:
Determine which elements and/or information will be repeated (department identifier, logo, a link to the next page, a return to the home page, etc.)
Make sure recurring text or buttons, banners, and identifying graphics appear in the same place throughout related pages.
Use a consistent style for headings.