Professional Cleaning Services

Dependable & Efficient Executive Building Maintenance

Conquest Building Service, Inc. is a privately owned and operated commercial janitorial and building service company. We provide a wide portfolio of commercial cleaning services in the Chicagoland area for different facilities including: office buildings, physicians offices, manufacturing plants, retail stores and banks.

The Conquest team has over 20 years of experience in the commercial janitorial and building service industries. With extensive training and experience with office buildings, industrial facilities, daycare centers, fitness centers and healthcare facilities including medical offices and surgical offices, we can assure that your place will receive the highest cleaning standard. 

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About Us

Our Vision


To become the premier provider of commercial cleaning and offer the highest and most comprehensive range of services through innovative strategies, the technological changes that benefit our employees and clients and a team of quality focused individuals dedicated to exceeding expectations.   

20 Years of Experience


Our team brings you over 20 years of experience in the commercial janitorial and building services industries.

We exceed expectations.

Our Guarantee


Conquest guarantees to complete all of its regularly scheduled cleaning commitments
on time.

Conquest also guarantees to respond to, and promptly resolve, any specific service issues
in a quick and timely manner.

Our Services


  • Janitorial (Day and night)
  • Medical Office Cleaning
  • Specialty Services
  • Floor and Carpet Cleaning
  • Construction Cleaning
  • 24 Hour Emergency Service
  • Green Cleaning
  • Recycle Program
  • Misc Services
  • One time special project service includes floor refinish and carpet shampoo

Commercial, Janitorial & Maintenance Services For:

  • Office buildings
  • Industrial facilities
  • Healthcare facilities
  • Research laboratories
  • Daycare centers
  • Banks
  • Retail stores
  • Nightclubs

Our Guiding Principles

  • INTEGRITY to act with honesty, openness and do what we say we will do
  • Set the standards for EXCELLENCE
  • PROTECT our relationship with the customer at all costs
  • Maintain a PROFESSIONAL IMAGE at all times


After inheriting a cleaning service when I was hired as the property manager for 3 commercial office buildings, I soon found that they were going through the motions and neither I nor my tenants were pleased with the level of service we were receiving. After interviewing several new services, I selected Conquest Building Services due their smaller size and the owners’ direct involvement and commitment to raise the bar in improving our client satisfaction internally. Both I and my tenants notice an immediate improvement in execution and thoroughness of their service, as well as communication with myself and my staff. We have been using them for several months now and I could not be happier that I made the change to Conquest Building Services. In addition to outstanding service, Radoslaws’ team has notified me of issues with toilets valves that need repair and exterior doors that were not closing fully that need attention. I now feel I have an extra set of eyes and a partner in increasing my lease retention and client satisfaction. I would recommend Conquest Building Services for an office or commercial building owners looking to improve their image to their current and potential tenants.


Christine K.

Commercial Property Manager



Download our brochure

Conquest Commercial Services (pdf)


New Customer Promotion (pdf)


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Questions or Comments?

We understand that every commercial situation has unique cleaning needs. Feel free to message or call us with any specifics.

Your time is valuable, and we will make sure to get back to you as soon as we can.


Conquest Building Services, Inc.

Servicing the Chicagoland Area

(847) 312-1775