About our Company

Sigma Engineering Inc.

is a full service Engineering Company, incorporated in Chicago to provide top of the line engineering services to both the public and private sector. Sigma is LEED accredited, a member of the United States Green Building Council, and is part of Registered Energy Professionals with the City of Chicago. We offer engineering services in mechanical, plumbing, fire protection, lighting, electrical, fire alarm, security, data, and communication.

Sigma Engineering Inc. is a licensed Illinois corporation and certified Disadvantage Business Enterprise (DBE) and Minority-Business Enterprise (MBE). The firm’s in-house capabilities include: Electrical, Lighting, and Mechanical (HVAC, Plumbing, and Fire Protection) Engineering.


Projects done


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Real professionals


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Latest Completed Projects

Sigma Engineering, Inc. has completed many projects over the years. The projects included on this page is an overview of a diverse array of projects, showing capabilities of our firm.


Joliet Multimodal Regional Transportation Center

The proposed JMRTC is conceived to be centrally located to serve a population that is currently located to serve a population that is currently underserved and demonstrates a greater need than the Joliet population as a whole. Equally important, the development of the JMRTC will correct existing safety issues at the project location by providing separate and secure transfer points, dedicated bus transfer points, and minimizing pedestrian and bus-train-vehicle conflicts. Sigma Engineering, Inc. has been commissioned for 5 phases of this project, which has a total of 8. Our core responsibilities for JMRTC are to provide electrical design for the following; Bus depot, Heritage Corridor Platform, Joliet Train Station House, Rock Island Platform, a Temporary Platform and Ticketing Office. Osman A. Meah and James M. Thompson were key personal to handle the electrical design which includes but not limited: Overall Electrical design, Lighting, Communication, Security, and Life Safety.

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CTA Loyola Station Renovation

The CTA Loyola station renovation was part of an upgrade and repairs initiative. Upgrades and repairs were applied to stationhouse and adjacent infastructures. The overview of the project helped pedestrians have a safer and more convenient commute by adding amenities,include new windows, flooring, lighting and interior finishes for a brighter, safer environment; additional bike parking; and installation of a new auxiliary entrance and turnstiles on the southwest side of the station, which was previously exit-only, to provide additional convenient access to the main stationhouse. Sigma Engineering, performed professional services for HVAC and Plumbing systems in accordance with the project requirements, general engineering practice, and the local governing building codes. Electrical heating, exhaust units, and plumbing design for new washrooms, janitor closet drainage and other effected plumbing system due to the renovation. Also, professional services necessary for lighting, power distribution, lighting control systems for a new Booth, TCVM’s, HBGs, fare array, janitor closet, wash rooms, vending machines and advertising signage.

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Humboldt Park Branch Library Addition

Humboldt Park Branch Library Added 5,000 sq ft. of additional building space. Making room for a Media room and expansion of services provided by Chicago Public Librarys. Sigma Engineering designed an MEP system connecting existing building MEP design to be incorporated in the new addition of the library. New addition includes; all MEP engineering and replacement of existing HVAC, plumbing, electrical, lighting and fire alarm security systems.

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Cook County Department of Corrections Fire Alarm Upgrade

Cook County Department of Corrections was in need of upgrade and repair to their fire alarm system. Existing Systems upgrade and integration of the fire alarm system with existing fire alarm systems. Sigma Engineering, prepared design documents for fire and smoke control systems. Modified layouts of proper control sequence to existing smoke exhaust system and smoke detectors. Designed stairwell pressurization system for life safety.

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Metra Van Buren Security Upgrade

Metra Van Buren Station was in need of an entirely new security camera system. The station needed digital records of the station layout. Sigma Engineering, digitized the entire station. Then designed the security camera placement using different types of cameras using multiple security formats. Special software to ensure each camera did not leave any blindspots throughout the station.

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Professional Services

  • Engineering Consultation
  • Investigation, Feasibility study and preparation of economic evaluations Analysis
  • Preparation of Preliminary Design Plans
  • Preparation of final/detailed plans
  • ​New facilities design
  • Modernizations & Improvements of building systems
  • Heating and Cooling Plants
  • Distribution System
  • LEED
  • Project Correspondance
  • Site and Project Analysis
  • Design Drawing, AutoCAD, and Microstation
  • Cost Estimating
  • Project Closeout

Experience in the following disciplines

§ Phase I – Studies and Preliminary Engineering
§ Phase II - Final Design and Construction Documents

Contact Us

Osman Meah

Tel 312.360.0359

27 E. Monroe St.
Suite 700
Chicago, IL

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