Landscaping Rules in Knoxville, TN

If you live in Knoxville or are thinking about moving there, landscaping rules are one of those things you probably won't think about until they affect you directly. Knoxville has 5 specific rules on the books covering different aspects of landscaping rules, and some of them might surprise you.

Tree Removal & Heritage Trees

Champion, landmark, and historic trees within Knoxville can't be removed or cut back more than 20 percent without an urban forester permit, issued only if the tree is a hazard or of low historic value.

Key details: Protected trees: champion, landmark, historic. Alteration limit: 20% of woody area. Permit decision window: 30 days. Appeal window: 15 days to city council.

Removing or cutting more than 20% of a designated champion, landmark, or historic tree without an urban forester permit violates § 14-35 and is punished under the article's penalty section, § 14-31.

Compared to other cities, Knoxville takes a harder line on tree removal & heritage trees. The enforcement and penalty structure reflects that.

Weed Ordinances

Grass, weeds, and other vegetation on Knoxville property can't top 12 inches: anything taller is presumed a public nuisance the owner must correct, per City Code § 13-143.

Key details: Height limit: 12 inches for grass and weeds. Legal effect: Presumed a public nuisance over 12". Cure period: 10 days after written notice. Citation: Knoxville Code of Ordinances § 13-143(a). Penalty: Up to $50 fine, $400 in costs.

Uncut lots draw a code enforcement notice with a 10-day cure period; the city can then mow and lien the property, plus a civil penalty up to $50 and administrative costs up to $400 (§ 13-147).

Tree Trimming

Knoxville property owners must prune trees bordering streets to keep at least 8 feet of clearance over sidewalks and 12 feet over streets, per the city forestry code.

Key details: Sidewalk clearance: 8 feet minimum. Street clearance: 12 feet minimum. Truck thoroughfare clearance: 14 feet minimum. Responsible party: Bordering property owner/occupant.

Letting a tree block a sidewalk, street light, or traffic sign, or ignoring hazardous limbs, violates Sec. 14-59(a) and is enforced under the article's penalty provision, Sec. 14-64.

Rainwater Harvesting

In Knoxville's South Waterfront form-based code district, which includes the Old Sevier and Scottish Pike (SW1) subdistrict, a rainwater harvesting or collection system under 10 feet tall may extend into the required rear setback if it stays at least 5 feet from the lot line, and rain barrels must be screened from the public street and riverwalk or built into the house's design.

Key details: Setback encroachment limit: Under 10 ft tall, 5 ft min. from lot line. Height bonus for the system: Up to 6 ft above max. building height. SW1 rain barrel duty: Screen/conceal from street and riverwalk. Applies in: South Waterfront (SW1-SW7) & Cumberland Ave.. Enforcing official: Director, Plans Review & Building Inspections.

Appendix B is enforced by the Director of Plans Review and Building Inspections under Article 18. Sec. 18.2 makes anyone who 'violates, disobeys, omits, neglects, or refuses to comply with' the Zoning Code subject to a fine for each offense, and Sec. 18.3 adds a further fine for each successive day an unscreened rain barrel or an out-of-tolerance encroachment continues uncorrected.

Composting

Knoxville's zoning code lets homeowners compost in their own backyard, but Article 10, Section 10.3.I of Appendix B confines bins and piles to the rear yard, caps their footprint at 5% of the lot or six feet tall, bars meat and dairy, and keeps the pile out of any required riparian buffer.

Key details: Location: rear yard only. Setback: 5 ft from lot lines. Max size: 5% of lot or 6 ft tall. Contents: no meat or dairy. Containment: must be enclosed or contained.

Composting violations run through the same Article 18 enforcement as the rest of Appendix B: the Director of Plans Review and Building Inspections enforces the standards, can involve the City Attorney to seek an injunction or abatement, and each day an oversized, unenclosed, or foul-smelling pile stays out of compliance counts as a separate fined offense under Section 18.2 until it's fixed.

The Bottom Line

Knoxville's landscaping rules rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Knoxville is broadly strict or permissive.

These rules come from Knoxville's publicly available municipal code. For complete penalty schedules, exemption details, and answers to common questions, see the individual ordinance pages throughout this guide.