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Serving the Greater Knoxville area
Since 1989!

Cityview Magazine has awarded Duncan & Sons’ the Best of the Best award for the fifth consecutive year, 2018, 2019, 2020, 2021 & 2022 voted on by our Staff and Clients! Being awarded once is a great honor, five times is the definition of Company Culture.

Cleaning, Janitorial and Building Maintenance is the bedrock of Duncan & Sons’. We are family owned & operated with a 32 year proven track record of serving East TN and greater Knoxville areas. “Relationships are as important to us as the work itself”, says owner and founder Gary Duncan “both with our Clients and our Staff”. This motto has driven Duncan & Sons’ to be a leading competitor in the Knoxville market.  Word is out, “for commercial cleaning, janitorial and maintenance, call Duncan & Sons'”

Gary started his company with a mission to provide commercial, educational, and industrial facilities with reliable quality cleaning service at competitive pricing. The commitment we make to our customers and employees is to have HONESTY, INTEGRITY, and a HEART OF SERVICE in all we do.


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Emergency 24 Hour Service

In the unfortunate event of an emergency due to water damage, Duncan & Sons’ staff is ready and available to care for your home or place of business.

Call us 24/7!


The IICRC (Institute of Inspection, Cleaning, & Restoration Certification), with industry-wide participation, certifies and develops certifications and standards for inspection, cleaning and restoration. We, at Duncan & Sons’, strive to stay up to date with the latest information provided by the IICRC, ensuring that each of our employees are educated and trained properly in their respective fields. By doing this, we are able to provide consistent, outstanding service to you and your family!

IICRC Certification

American Drying Institute

Duncan & Sons Building Maintenance, Janitor Service, Knoxville, TN


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