Knoxville, TN Building Setbacks & Zoning: Lot Coverage Limits (2026)
Key Facts
- Building coverage cap
- 25% in EN rising to 50% in RN-7
- Impervious surface cap
- 35% in EN rising to 70% in RN-7
- RN-3 townhouse and nonresidential
- 50% building, 60% impervious
- RN-6 townhouse, multifamily, nonresidential
- 50% building, 70% impervious
- Permeable pavement
- Counted at a reduced share, Engineering approval required
- Enforcement
- Director of Plans Review and Building Inspections
- Relief
- Variance from the Board of Zoning Appeals (Section 16.3)
Summary
Knoxville caps how much of a residential lot can be covered. Building coverage tops out at 25% in the EN District, 30% in RN-1 and RN-2, 35% in RN-3 through RN-5, 40% in RN-6 and 50% in RN-7. Impervious surface, which adds paving and driveways to the buildings, is capped from 35% in EN up to 70% in RN-7. Townhouse, multifamily and nonresidential lots get higher ceilings in several districts.
Table 4-2: Residential Districts Dimensional Standards EN RN-1 RN-2 RN-3 RN-4 ... Maximum Building Coverage 25% 30% 30% 35% TH & Nonresidential: 50% 35% TH, MF, Nonresidential: 50% Maximum Impervious Surface 35% 40% 40% Nonresidential: 50% 45% TH & Nonresidential: 60% 45% TH, MF, Nonresidential: 60% ... Table 4-2: Residential Districts Dimensional Standards RN-5 RN-6 RN-7 ... Maximum Building Coverage 35% TH, MF, Nonresidential: 50% 40% TH, MF, Nonresidential: 50% 50% Maximum Impervious Surface 45% TH, MF, Nonresidential: 60% 50% TH, MF, Nonresidential: 70% 70%
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 80).
Full Breakdown
Table 4-2 in Section 4.3 of Appendix B, the Knoxville Zoning Code, sets two separate caps for every residential district: maximum building coverage and maximum impervious surface. Building coverage is the share of the lot under buildings and accessory structures, measured by footprint without eaves and overhangs under the rules of measurement in Section 2.4. Impervious surface is wider. It counts structures, pavement and every other surface that does not let water soak into the ground, as a percentage of total lot area, so a driveway or patio uses up impervious allowance but not building allowance. Permeable pavement counts at a reduced share, and only with approval from the Department of Engineering.
The building coverage caps run EN 25%, RN-1 30%, RN-2 30%, RN-3 35%, RN-4 35%, RN-5 35%, RN-6 40% and RN-7 50%. The impervious surface caps run EN 35%, RN-1 40%, RN-2 40%, RN-3 45%, RN-4 45%, RN-5 45%, RN-6 50% and RN-7 70%. Several districts raise the ceiling for denser or non-home uses. RN-3 lets townhouses and nonresidential uses reach 50% building coverage and 60% impervious surface. RN-4 and RN-5 extend the same 50% and 60% ceilings to townhouses, multifamily and nonresidential lots. RN-6 gives those uses 50% building coverage and 70% impervious surface. RN-2 holds building coverage at 30% for every use but allows nonresidential lots 50% impervious surface. EN, RN-1 and RN-7 carry one figure for all uses.
Coverage limits interact with other parts of the code. Section 10.3 caps detached accessory structures by lot-area tier, and every such structure must still fit inside the district's building coverage. Section 17.1 allows an addition to a nonconforming building only if the building and addition together stay within the maximum coverage permitted in the district. Section 17.3 addresses lots that become nonconforming with building coverage after a right-of-way dedication, and allows a final plat that adds no new nonconformity. Relief from a cap comes through the variance process in Section 16.3, decided by the Board of Zoning Appeals after a public hearing. Table 4-2 sits beside minimum lot area, setbacks and height in the same section, so a coverage check starts with the district and the housing type on the lot.
Violations & Fines
The Director of Plans Review and Building Inspections enforces the Zoning Code and can bring in the City Attorney to seek an injunction, abatement or other action to stop a violation. A person convicted of exceeding a coverage cap is fined for each offense under Section 18.2, and each day the violation continues counts as a separate offense. Penalties stop accumulating once the violation is corrected, though fines already incurred stay owed. The property owner can also be held responsible for the City's legal expenses. Fine amounts are set in the Knoxville City Code.
Frequently Asked Questions
What is the maximum building coverage on a single-family lot in Knoxville?
Does a driveway count toward Knoxville lot coverage limits?
Do townhouses and apartments get higher coverage limits in Knoxville?
Can an owner exceed the lot coverage limit in Knoxville?
What happens if a Knoxville property exceeds its coverage cap?
Sources & Official References
Other rules in Knoxville
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