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Sine Qua Non | Absolutely Essential

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About SQN Associates
- Culture, Mission, and Values
- The SQN Team
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Services
Our Work
About SQN Associates
- Culture, Mission, and Values
- The SQN Team
Careers

BUILDINGS & FACILITIES

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Our Work

CTA Non Revenue Vehicle Maintenance Facility

Learn More about CTA Non Revenue Vehicle Maintenance Facility

Democratic National Convention 2024

Learn More about Democratic National Convention 2024

PH 20230617 Racine JBC CanalTieHouseMob (2)

CTA Canal, Barry, and Damen Substations

Learn More about CTA Canal, Barry, and Damen Substations

SQNA_CTA West Shops Fire Alarms 1

CTA West Shops Fire Alarms

Learn More about CTA West Shops Fire Alarms

PBC (CPS) Rogers Elementary Annex & Renovations

Learn More about PBC (CPS) Rogers Elementary Annex & Renovations

PBC (CPS) Hancock Replacement School

Learn More about PBC (CPS) Hancock Replacement School

interior4

PBC (CPS) Rickover Military High School Renovation

Learn More about PBC (CPS) Rickover Military High School Renovation

SQN is certified as a Disadvantaged Business Enterprise (DBE) in GA/IL/IN/MA/UT/WI, Minority Business Enterprise (MBE), Women’s Business Enterprise (WBE), and Women-Owned Small Business (WOSB).

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134 North LaSalle Street, Suite 700, Chicago, IL 60602

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