Architect and interior designer?

That's like comparing apples and oranges. For one, neither is the boss of the other since the owner will contract with the architect and the interior designer separately. However they will have to learn to play nice with each other in a project in theory. Like all professions, there are competent, incompetent, and everything in between. So for argument sake, I'm going to assume that we're talking about competent interior designers. Like architects, interior designers work hard at their trade and has a lot to offer to any project. They furnish and colorize the space, often changing some layout of the architect's plans. I prefer to work with interior designers that have their fee that is void of any procurement. Many interior designers charge a low design fee than hit up the owner on mark up on furniture and decoration purchases. That way, they charge a pre approved small (5-10%) percentage plus the actual cost of the pieces.

When remodeling a house, if the scope of work is small, I always recommend for the owner to deal directly with a builder and draftsman. It isn't financially feasible to use an architect on a small project. If the project is large and/or complicated, then the services of an architect is warranted. Most building department do not requrie an architect involved with residential projects. So you can just hire an engineer to review the structural and electrical portion of the remodel. The builder or the designer should have contacts of those who they've worked with before. They will provide the recommendations.

Architect - designs the furniture and space. (Usually has a minimum of 6-7 years of college education including training in art, structural design, as well as all eras or architecture).

Designer - uses your money to buy furniture they think is cool (which was designed by an architect). Does not have to have a degree of any kind.

Usually an Architect will have an Engineeer on staff that will review and sign thier work.