• All of Delaware
• New Castle County
• Kent County
• Sussex County

12 licensed firms in New Castle County, in alphabetical order.

• ABHA Architects

  Wilmington, New Castle County

  State-licensed
  Call ABHA Architects at (302) 658-6426

• Architectural Alliance

  Wilmington, New Castle County

  State-licensed
  Call Architectural Alliance at (302) 478-3777

• Breckstone Studio, a studio of The Martin Architectural Group (TMAG)

  Wilmington, New Castle County

  State-licensed
  Call Breckstone Studio, a studio of The Martin Architectural Group (TMAG) at (215) 665-1080

• Cooperson Associates

  Wilmington, New Castle County

  State-licensed
  Call Cooperson Associates at (302) 655-1105

• Cox Architecture

  Wilmington, New Castle County

  State-licensed
  Call Cox Architecture at (215) 275-3552

• Design Collaborative, Inc.

  Wilmington, New Castle County

  State-licensed
  Call Design Collaborative, Inc. at (302) 652-4221

• footprint architecture & design

  Newark, New Castle County

  State-licensed
  Call footprint architecture & design at (302) 981-2635

• Gilbert Architects

  Newark, New Castle County

  State-licensed
  Call Gilbert Architects at (302) 318-1383

• Nowland Associates

  Newark, New Castle County

  State-licensed
  Call Nowland Associates at (302) 731-1333

• R G Architects, LLC

  Middletown, New Castle County

  State-licensed
  Call R G Architects, LLC at (302) 376-8100

• StudioJAED

  Bear, New Castle County

  State-licensed
  Call StudioJAED at (302) 832-1652

• Tevebaugh Architecture

  Wilmington, New Castle County

  State-licensed
  Call Tevebaugh Architecture at (302) 984-1400

Source: the Delaware Division of Professional Regulation's list of licensed firms. We list a firm only when its architecture firm (Certificate of Authorization) license is active. Street and phone come from each firm's own website. Checked September 26, 2026. How listings work.