A solid choice for building in Southeast. Defined zoning, moderate flood risk, and very affordable land.
📊65/100AcreScore
💰$7KLand $/acre
🏠$265KHome Value
👥15,932Population
📈+10%Growth (10yr)
🌊25%Flood RiskModerate
🌡️Missouri River, Sioux City metro fringeClimateZone 5a
🏗️ Can You Build Here?
Union County has local zoning regulations. Check with the county building department for specific rules on your parcel. Barndominiums may require conditional use permits in some zones.
Zone
Min Lot
Barndo OK?
Residential
Varies
⚠️ Conditional
Agricultural
None
✅ Yes
Commercial
Varies
❌ No
Union County has local zoning. Contact the county building department for specific regulations.
📋 What Permits Do You Need?
Most states allow owner-builders to act as their own general contractor for personal residences. Check South Dakota requirements — licensed subs are typically needed for electrical, plumbing, and HVAC.
Required Permits
• Building permit (residential)
• Septic permit (if no public sewer)
• Electrical permit
• Plumbing permit
Permit Office
Union County Building Department
Elk Point, SD
Contact county clerk for current hours and requirements
🌊 What's the Flood & Soil Risk?
Elevated flood risk at 25%. Union County has significant FEMA flood zone coverage — careful site selection and flood insurance may be required. Check FEMA maps for your specific parcel.
25%
In Flood Zone
Good
Soil Drainage
Good
Septic Viability
Source: FEMA National Flood Hazard Layer, USDA Web Soil Survey
💰 What Does It Cost?
Affordable land market. At roughly $7,000 per acre, Union County offers good value for builders looking for rural acreage.
$7K
Median $/acre
$265K
Median Home Value
$120–200
Build Cost $/sqft
1.4%
Property Tax Rate
Source: U.S. Census Bureau ACS 2024, Union County Assessor
🏔️ Why People Love Living Here
Union County sits in the heart of Southeast. Sioux Falls is 45 min away. No state income tax means your dollar stretches further here than in most states.
🏗️
Affordable Land
Median land at $7,000/acre means you can buy more, build bigger, and still stay under budget.
🏠
Established Community
Zoning provides predictability — you know what your neighbors can and can't build. Good for long-term property value.
At a Glance
Population15,932
10-Year Growth+10%
County SeatElk Point
State Income TaxNone
ClimateMissouri River, Sioux City metro fringe (Zone 5a)
How Close Is Everything?
Sioux Falls45 min
Sioux Gateway20 min
Austinvaries
💧 Utilities & Infrastructure
Most rural Union County land uses well water and septic systems. Municipal utilities are available near Elk Point. Check with local utility providers for your specific parcel.
Electric ProviderLocal Co-op / TXU
WaterWell or Municipal
SewerSeptic (most rural)
InternetVaries by location
Cell CoverageVariable
Natural GasPropane common in rural areas
🏦 Financing & Incentives
Union County qualifies for USDA Rural Development loans — zero-down-payment financing for eligible buyers in most areas.
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❓ Frequently Asked Questions
Can I build a barndominium in Union County?
Check with the Union County Building Department for specific zoning rules on your parcel. Some zones allow barndominiums outright, others may require conditional use permits.
How much does land cost in Union County?
Median price is approximately $7,000 per acre, though prices vary by location, road access, and improvements. USDA Rural Development loans may be available for eligible buyers.
Is Union County eligible for USDA Rural Development loans?
Yes — most of Union County qualifies for USDA Rural Development programs, including zero-down-payment home loans for eligible buyers.
What is the property tax rate in Union County?
The effective property tax rate is approximately 1.4%. Check with the county assessor for the most current rates and any available homestead exemptions.
Do I need a licensed contractor to build in Union County?
Most states allow owner-builders to act as their own general contractor for personal residences, though requirements vary by state and county. In South Dakota, check local building codes for specific licensing requirements. You'll typically need licensed professionals for electrical, plumbing, and HVAC work.