- I-5 Design and Manufacture
 - Design, manufacture, and installation of interior and exterior decor and signage. I-5 Design and Manufacture specialises in casinos, grocery stores, banks, restaurants, and retail stores. - ICON Architecture, Inc.
- Architectural firm providing services in architectural design, urban planning, interior design and landscape architecture.
- IDC
- Provides integrated services for planning, design, construction, and sustained engineering/maintenance for industrial facilities.
- IDS/B
- Architecture and interior design firm specialising in golf clubs and restaurants.
- IKOY Group, The
- Offering services in architecture, interiors, urban design, project management, and facilities management with offices in Petaluma, Coral Gables, Winnipeg, Ottawa, Paris, and Alymer.
- Image Architects, Inc.
- Offers document management software and consulting services.
- Imagineering Limited
- Consulting engineers and project managers in the study, planning, design, specification and implementation of broadcast, computer and communications related facilities.
- Impact Design & Architecture Group, Inc.
- Specialising in residences; also engaged in multi-family housing, interior design, institutional and government projects, and commercial development.
- IN Architects & Planners, Inc.
- Inarch
- Interior architects providing creative design solutions, strategic planning, and project management.
- Indigo / Hammond and Playle Architects, LLP
- Engaged in residential, cultural, civic, education, and corporate projects. Specialising in straw bale construction and skate parks and rinks.
- Integrated Conservation Resources, Inc.
- Multi-disciplinary consultancy offering a broad range of architectural conservation services.
- Integrated Designs Inc.
- Architecture and engineering firm.
- Interactive Resources
- Architecture, engineering, and planning firm providing professional services for all building types.
- Intercision
- Architecture, interior and furniture design firm.
- InterDesign Group, Inc.
- Total architectural development.
- Interior Space International
- Commercial interior design, strategic planning and architecture.
- International Parking Design
- Specialising in parking structures and related issues. Provides architectural, engineering, and consulting services.
- IR. PRJ Toornend
- Engaging mainly in spatial and programmatical design, ranging from small architectural conversions to large scale urban (re-) development schemes.
- Irish Pub Company
- Specialises in the design, manufacture and installation of authentic Irish Pubs worldwide.
- Isenberg + Associates
- Ishimoto Architectural & Engineering Firm, Inc.
- Services include project and construction management, interior design, architectural, structural, mechanical and landscape design, urban design, and redevelopment.
- Island Architects - Chester, VA
- Creators of site-responsive, sustainable, award-winning, island architecture for unique coastal and inland communities.
- Izgradnja
- Architectural design and civil engineering.
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