Whether you need an architect for a home addition depends on the project's complexity, local building codes, and your preferences. For significant structural changes, complex designs, or homes in areas with strict regulations, an architect's expertise is essential to ensure compliance and a seamless integration of new and existing spaces. Architects provide design expertise, project management, and can help avoid costly mistakes. However, for simpler projects or if you have budget constraints, working with a general contractor or draftsman might suffice. Consulting local building authorities and professionals can help you make an informed decision.