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A designer plans how a space will look, feel, and function—selecting layouts, finishes, fixtures, and furnishings—while an architect is a licensed professional who designs buildings and, in most U.S. states, must stamp drawings for permits, structural changes, and life-safety code compliance. If your project involves moving walls, changing a building's structure, or obtaining a construction permit, you generally need an architect (or another licensed design professional). If you're refreshing finishes, reconfiguring furniture, or planning decor, a designer is usually the right hire. AIA Delaware, the state chapter of the American Institute of Architects, describes the AIA as "the voice of the architectural profession and a resource for its members in service to society"—a useful starting point when you need to verify whether someone is a licensed architect.

What a Designer Actually Does

A designer's work centers on the interior and experiential side of a project. Typical tasks include:

• Space planning — deciding how furniture, traffic flow, and zones fit within existing walls.
• Material and finish selection — flooring, paint, tile, countertops, cabinetry hardware.
• Lighting and fixture specification — choosing and positioning fixtures within existing electrical layouts.
• Furnishing and styling — sourcing furniture, textiles, and accessories.
• Concept and mood development — translating a client's taste into a coherent visual direction.

Designers may hold credentials such as NCIDQ certification or state interior design registration, but these are separate from architectural licensure. Not every designer is certified, and certification requirements vary by state.

How a Designer Differs from an Architect

The core difference is licensure and legal authority, not creativity. Both roles design, but only a licensed architect can legally sign and seal construction documents in most jurisdictions.

A useful rule of thumb: if the work touches the building's structure, envelope, or means of egress, it belongs to an architect. If it touches what's inside the shell, a designer can often handle it.

When a Project Legally Requires an Architect

Requirements are set by state and local building codes, so they vary. In general, an architect (or another licensed design professional) is needed when:

• You are constructing a new building.
• You are adding square footage or altering the structural system.
• You are changing occupancy or use in a way that affects life-safety requirements.
• You need a building permit that requires sealed drawings.

For a Delaware-specific project, confirm the requirement with the local building department or permit office before hiring, since thresholds can differ by municipality and project type.

Choosing Between a Designer and an Architect

Work through these steps:

1. Define the scope. List exactly what will change—finishes only, or walls and structure?
2. Check permit requirements. Call your local building department and ask whether your scope needs sealed drawings.
3. Match the professional to the scope. Finishes and furnishing → designer. Structure, additions, permits → architect.
4. Verify credentials. For an architect, confirm licensure through the state licensing board or a professional body such as AIA Delaware.
5. Consider collaboration. On larger interior projects, an architect and designer often work together—the architect handles the shell and code, the designer handles the interior experience.

If you're unsure which side of the line your project falls on, start with the permit question. The answer usually determines who you need to hire.