How Hendersonville Handles Accessory Structures: A Practical Guide

Hendersonville maintains 104 local ordinances across all categories, and 5 of those deal specifically with accessory structures. Here is a breakdown of what the city actually requires, what is prohibited, and where Hendersonville falls on the strict-to-permissive spectrum compared to other cities.

Garage Conversions

Converting a garage to habitable space in Hendersonville requires a building permit from the Codes Department under the Tennessee-adopted IRC. If the conversion adds a kitchen and separate entrance creating an independent living unit, it becomes either an Attached Accessory Apartment under Ch. 10.4 (capped at 40% of combined heated area, family/domestic-employee occupancy only, owner-occupant required) or — if separated and on a 30,000+ sq ft lot — a Detached Accessory Dwelling requiring a Conditional Use Permit. Off-street parking required for the principal dwelling must still be met (4 spaces if ADU is added).

Key details: Building Permit: Required (2018 IRC w/ TN amendments). ADU Trigger: Kitchen + separate entrance → Ch. 10.4 ADU rules. Attached Garage Conversion (as ADU): Attached Accessory Apartment — ≤40% combined heated area. Detached Garage Conversion (as ADU): Requires 30,000+ sq ft lot + Conditional Use Permit ($250). Owner-Occupant Required: Yes (≥75% of calendar year).

Converting a garage without a building permit is a violation of the Tennessee-adopted IRC and Hendersonville Codes ordinances: stop-work order, double permit fees, denial of certificate of occupancy. Creating an unpermitted dwelling unit (kitchen + separate entrance) without the required Accessory Dwelling approvals is a Ch. 10.4 zoning violation triggering enforcement under Municipal Code § 1-407 and potential order to restore the garage to its permitted condition.

Shed Rules

Hendersonville Zoning Ordinance Chapter 10.4 (Accessory Buildings) allows up to 2 accessory buildings on a residential property, placed in the rear yard or beside the house (no closer to the street than the house). In Suburban Residential-Low Density (SR-1), the side setback is 10 ft; in SR-2 (Medium Density), 8 ft. Rear setback is 20 ft in both. A small-structure exception (under 400 sq ft and 10 ft from the house) allows a 5 ft side/rear setback. Combined size is capped on a sliding scale from 800 sq ft (lots under 15,000 sq ft) to 2,500 sq ft (lots over 3 acres) or 50% of the principal dwelling, whichever is less. Building permits follow Tennessee Building Code for any structure over 200 sq ft.

Key details: Code Reference: Hendersonville Zoning Ord. Ch. 10.4 (Accessory Buildings). Max Accessory Buildings: 2 per lot (small arbors/trellises don't count). SR-1 Side Setback: 10 ft. SR-2 Side Setback: 8 ft. Rear Setback (SR-1/SR-2): 20 ft.

Building a shed outside the size, setback, or material rules is a Chapter 10.4 violation enforced by Building Codes & Zoning Compliance: stop-work order, denial of permits, removal order, and city general penalty under Municipal Code § 1-407 (up to $50 per offense). Building inside an easement may also expose the owner to private removal-and-cost claims by the easement holder.

ADU Rules

Hendersonville Zoning Ordinance Chapter 10.4 permits an Accessory Apartment (attached to the principal dwelling) OR a Detached Accessory Dwelling — but never both on the same lot. Tennessee does NOT preempt local ADU rules, so the city's restrictive scheme stands: owner-occupant required, occupant must be a relative or domestic employee, detached ADUs require a 30,000+ sq ft lot AND a Conditional Use Permit ($250 fee) from the Board of Zoning Appeals, with strict size caps tied to lot size and a 20 ft setback from side/rear lines.

Key details: Code Reference: Hendersonville Zoning Ord. Ch. 10.4. Owner-Occupancy: Required (≥75% of calendar year). Eligible Occupants: Family (parents, grandparents, children, in-laws, nieces/nephews) + domestic employees. Attached vs Detached: One or the other — never both. Attached: Size Cap: ≤40% of combined heated area.

Constructing an ADU without the required zoning permits, Conditional Use Permit, or recorded covenant is a Chapter 10.4 violation enforced by Building Codes & Zoning Compliance: stop-work order, denial of certificate of occupancy, and city general penalty under Municipal Code § 1-407. Renting the ADU to non-family members or non-domestic employees violates the recorded covenant and triggers permit revocation plus civil enforcement on the covenant.

This is one of the stricter rules in Hendersonville's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

Carport Rules

Carports in Hendersonville are accessory structures regulated under Zoning Ordinance Chapter 10.4. Detached carports must follow the standard accessory-building setbacks: 10 ft side in SR-1, 8 ft side in SR-2, 20 ft rear in both. The 'under 400 sq ft + 10 ft from house' exception drops to a 5 ft side/rear setback. Carports under 120 sq ft do not count toward the 2-building maximum. Attached carports follow principal-building setbacks for the underlying zoning district. Building permit required for carports over 200 sq ft under the Tennessee IRC.

Key details: Code Reference: Hendersonville Zoning Ord. Ch. 10.4. Detached Carport Side Setback (SR-1): 10 ft. Detached Carport Side Setback (SR-2): 8 ft. Detached Carport Rear Setback: 20 ft (SR-1/SR-2). Small-Structure Exception: Under 400 sq ft + 10 ft from house → 5 ft setback.

Building a carport without a required permit or in violation of setback/material/easement rules is a Ch. 10.4 violation enforced by Building Codes & Zoning Compliance: stop-work order, removal order, double permit fees, and city general penalty under Municipal Code § 1-407.

Tiny Homes

Tiny homes in Hendersonville must comply with the Tennessee-adopted 2018 IRC (including Appendix Q for dwellings 400 sq ft or less). A site-built tiny home on a permanent foundation is either the principal single-family dwelling (must meet zone's minimum lot size and principal-building setbacks) or an accessory dwelling subject to Ch. 10.4 ADU rules (30,000+ sq ft lot, CUP, family-only occupancy, 1,200-1,800 sq ft cap). Tiny homes on wheels classified as RVs or travel trailers cannot be used as a residence in residential zones. Tennessee does not preempt local tiny-home rules.

Key details: Building Code: 2018 IRC (TN-adopted) + Appendix Q (≤400 sq ft). As Principal Dwelling: Must meet zone's min lot and principal-building setbacks. As Accessory Dwelling: Ch. 10.4 — 30,000+ sq ft lot, CUP, 1,200-1,800 sq ft cap. Tiny Home on Wheels (RV): Cannot be used as residence in residential zones. Owner-Occupancy: Required (for ADU pathway).

Living in an RV-classified tiny home in a residential zone is a Ch. 10 zoning violation enforceable by the Building Codes & Zoning Compliance office: order to vacate, city general penalty under Municipal Code § 1-407, and possible referral to Municipal Court. Building a site-built tiny home without permits triggers stop-work, IRC enforcement, and double permit fees.

This is one of the stricter rules in Hendersonville's municipal code. If you are unsure whether your situation complies, it is worth checking with the city before proceeding.

The Bottom Line

Hendersonville is tougher than many cities when it comes to accessory structures. Out of the 5 rules covered here, 2 are rated strict. If you are a homeowner, renter, or business owner in Hendersonville, take the time to understand these requirements before they become a problem. Most violations come with fines, and some repeat violations can escalate.

Keep in mind that Hendersonville can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.