ADU Rules in Greenville, SC (2026)
ADU rules, permit requirements, size limits, and fees for Greenville, SC. Source-cited from official municipal code.
Yes, ADUs are allowed in Greenville, SC.
Greenville, SC permits accessory dwelling units (ADUs) on residential properties. ADUs — also called granny flats, in-law units, backyard cottages, or secondary suites — are secondary housing units on a single-family or multifamily lot. State and local law governs the approval process. In Greenville, the City of Greenville Planning and Development — Building Permits handles ADU permit applications. Below you will find the current size limits, setbacks, fees, and timeline for building an ADU in Greenville.
ADU Size Limits
ADU Size Limits in Greenville: Detached ADU: up to 900 sq ft (max height: 22 feet). Attached ADU: Up to 35% of primary dwelling floor area. Greenville LMO. Detached ADUs limited to 900 sqft in residential zones. Greenville's growing housing affordability challenge — driven by rapid population growth and in-migration — has increased interest in ADU development. Attached ADUs may be internal conversions of existing floor area. JADU is a California-specific designation not applicable in South Carolina.
| Type | Max Size | Max Height |
|---|---|---|
| Detached ADU | 900 sq ft | 22 feet |
| Attached ADU | Up to 35% of primary dwelling floor area | Per zone height limit |
Permit Fees
ADU Permit Fees in Greenville: Plan check fee: $200–$700. Building permit fee: $400–$2,000 based on construction value. Impact fees: None. School fees: None or N/A. Total estimated permit cost: $800–$4,000 total fees. Greenville Planning and Development fee schedule. No broad development impact fees. Building permit fees based on construction valuation. Greenville Utilities Commission connection fees for new water/sewer ADU connections may apply.
| Fee Type | Amount |
|---|---|
| Plan Check | $200–$700 |
| Building Permit | $400–$2,000 based on construction value |
| Impact Fees | None |
| School Fees | None |
| Total Estimate | $800–$4,000 total fees |
Permit Timeline
Greenville ADU Permit Timeline: Greenville Planning and Development processes permits. Standard ADU: 4-6 weeks. Greenville's online permit portal: https://aca.greenvillesc.gov/. Greenville's growth pace means permit backlogs can occur — early application submission recommended. Apply through the City of Greenville Planning and Development — Building Permits online permit portal. Phone: (864) 467-4476.
Setback Requirements
ADU Setback Requirements in Greenville: Front setback: follows zone standard. Side setback: 5 feet. Rear setback: 5 feet. Greenville LMO. Detached ADUs require 5 ft rear and 5 ft side setbacks in residential zones. Greenville's mix of older urban neighborhoods (North Main, Hampton-Pinckney) and newer suburban development creates varied lot patterns that affect ADU placement feasibility.
Parking Requirements
Parking Requirements: 1 parking space per ADU. Greenville's downtown core and walkable neighborhoods near Main Street may qualify for reduced parking requirements. Greenville Transit Authority (GTA) bus service extends to many residential areas. Properties within 1/4 mile of GTA routes may qualify for parking reduction under Greenville LMO.
Restrictions & Requirements
- Maximum one ADU per single-family residential lot
- ADU must be on same lot as primary dwelling
- Historic Hampton-Pinckney neighborhood properties may require additional design review
- ADU must have independent entrance from primary dwelling
- Lot coverage limits by zone apply — ADU footprint counts toward coverage
How Many ADUs Are Allowed?
Number of ADUs Allowed in Greenville: Single-family lots: 1. Multifamily properties: Additional units within base zone density limits. Greenville allows one ADU per single-family lot. Greenville's Housing Diversity Plan supports ADU expansion as part of addressing housing supply constraints driven by rapid growth.
Single-Family Lots
1
Multifamily Properties
Additional units within base zone density limits
Historic District Considerations
Historic District Requirements: Greenville has 2 historic districts where additional design review may be required for ADU construction. Design review approval is required before obtaining a building permit for properties in historic overlay zones. Greenville's Hampton-Pinckney Historic Neighborhood is a locally designated historic district covering late-Victorian and early-20th-century homes near downtown. The North Main neighborhood also has historic significance. Greenville's design review is less prescriptive than Charleston's BAR but still requires compatibility with neighborhood character for exterior changes to designated properties. Greenville's historic preservation program is administered through the Planning and Development Department. Source: https://www.greenvillesc.gov/planning/historic-preservation Look up historic district boundaries at: https://www.greenvillesc.gov/planning/historic-preservation
Frequently Asked Questions
Can I build an ADU in Greenville?
Yes. Greenville, SC allows accessory dwelling units. On a single-family lot you can build 1.
How big can an ADU be in Greenville?
The maximum size for a detached ADU in Greenville is 900 square feet.
How long does it take to get an ADU permit in Greenville?
The typical ADU permit timeline in Greenville is Greenville Planning and Development processes permits. Standard ADU: 4-6 weeks. Greenville's online permit portal: https://aca.greenvillesc.gov/. Greenville's growth pace means permit backlogs can occur — early application submission recommended.. Total estimated permit fees are $800–$4,000 total fees.
Do I need extra parking for an ADU in Greenville?
No, Greenville does not require additional parking for ADUs.
Do I have to live on-site to have an ADU in Greenville?
No, owner-occupancy is not required for ADUs in Greenville.
Source: City of Greenville Land Management Ordinance (LMO); Building Code. Last verified April 6, 2026. View source