What are the specific responsibilities of the contractor vs. the architect?

Beyond having the architect create the design and the contractor implement it, both professionals have additional responsibilities. The contractor is responsible for pricing the project and ensuring that it is completed in a timely fashion. The architect is responsible for getting the construction drawing completed with proper specifications and architectural detail. Since many jurisdictions require architectural drawings to be reviewed to ensure the plans sufficiently meet local codes, the architect may also be responsible for applying for and securing the permits. Make sure that everyone, you included, understand who is responsible for what before work begins in your home.