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. Sigma Engineering is MBE/DBE certified. We offer engineering services in mechanical, plumbing, fire protection, lighting, electrical, fire alarm, security, data, communication, construction administration, and construction management. MBE/DBE Certified. LEED Accredited. Please feel free to contact Sigma for all your engineering needs.