Fully Insured & Bonded
Complete liability coverage on every job, every crew.
Our Story
Built in Knoxville, for Knoxville
We started in 1985 with a simple conviction: commercial buildings could be genuinely clean without dousing them in harsh chemicals. Four decades later that conviction is a full-service operation covering offices, construction sites, event venues and contract janitorial programs across East Tennessee.
As a member of the U.S. Green Buildings Council, we hold our supply chain and our methods to environmental standards that protect the people inside the buildings we service — and the region we all live in.
Work with us
USGBC Member
Green cleaning standards
40+
Years Serving TN
24/7
Emergency Response
5.0
Average Star Rating
100%
Insured & Bonded
Why National Building Service
Four decades of doing it properly
USGBC Member
Green cleaning practices aligned with U.S. Green Building Council standards.
24/7 Availability
Round-the-clock emergency response for contract customers.
40 Years In Business
Serving East Tennessee businesses since 1985.
Our Work
On site across East Tennessee
Our crews at work — including stadium and arena turnarounds where thousands of seats have to be spotless before the next gate opens.
Our Services
Four divisions, one standard
Office Cleaning
Spotless, healthy workspaces cleaned on your schedule — daily, weekly, or after hours.
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Construction Cleaning
Post-construction and rough-clean crews that get new builds handover-ready fast.
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Event Cleaning
Pre-event prep, live event porters, and rapid post-event turnaround crews.
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Janitorial Services
Ongoing contract janitorial programs with 24/7 emergency response built in.
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Coverage
Where we work
Headquartered on E Magnolia Avenue in Knoxville, with crews covering East Tennessee and contract capability across the Southeast.
Knoxville Maryville Oak Ridge Seymour Nashville Chattanooga Memphis Atlanta
Client Reviews
Rated 5 stars by East Tennessee businesses
Taylor Michael
Great company to work with. They keep our offices spotless and are always responsive when we need something extra. Highly recommend them for any commercial space.
Danielle R.
We have used National Building Service for our facility for years. Reliable, thorough, and the crew is always professional. The 24/7 response has saved us more than once.
Marcus W.
They handled the post-construction clean on our build and got it handover-ready ahead of schedule. Not a speck of drywall dust left anywhere.
Sandra K.
Switched to them after our previous cleaners kept missing details. Night and day difference. Our staff notices and comments on it.
James P.
Used them for a large corporate event. The venue was immaculate before guests arrived and completely reset by the next morning. Seamless.
Angela T.
Very happy with the green cleaning approach. Safe products, no harsh chemical smell, and the building still looks and feels genuinely clean.