Sioux Falls

Minnehaha County portion

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ADU Pass helps homeowners in Sioux Falls, Minnehaha County, South Dakota navigate the permit paperwork for building an accessory dwelling unit. This area covers 7 ZIP codes.

7 ZIP codes

Map

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ADU details

ADU legality: unclear

Stateunclear (South Dakota accessory-dwelling framework) — South Dakota statewide ADU posture per state-adu-research file.

Countywith-restrictions (Minnehaha County unincorporated zoning) — Minnehaha County permits ADUs in unincorporated areas under state-law-aligned standards. Within Sioux Falls city limits the city ordinance plus state law govern.

Citywith-restrictions (City of Sioux Falls Municipal / Zoning Code — Accessory Dwelling Units) — City of Sioux Falls permits ADUs under the local ordinance aligned with South Dakota statewide framework where applicable.

South Dakota leaves ADU regulation to local municipalities under home-rule or Dillon-rule authority. Sioux Falls permits ADUs subject to local conditions per its zoning ordinance.

Cost scenarios

Scenario	Sq ft	Permit	Build	Total
minimum	150	$1,700	$35,250	$36,950
600	600	$1,700	$141,000	$142,700
midpoint	525	$1,700	$123,375	$125,075
maximum	900	$1,700	$211,500	$213,200

Fee breakdown

Plan review$510

Building permit$935

Impact fees$255

Total$1,700

Viability (permitted uses)

Long-term rental: yes Long-term rental of ADU generally permitted; landlord-tenant law and any city rental-registration ordinance apply.
Short-term rental: with-restrictions STR rules vary by city. Sioux Falls regulates STRs separately from ADU permitting; check local STR ordinance and HOA covenants.
Office rental: with-restrictions Detached office rental requires home occupation permit or rezoning.
Home office: yes Home occupation permitted with restrictions on signage and customer traffic.
Studio / workshop: yes Personal artist studio is a permitted accessory use.
Agriculture: with-restrictions Limited urban agriculture permitted in residential zones; livestock varies by district.
Relative support: yes Family-occupancy ADU explicitly permitted in single-family zones.

Utilities

Water: Sioux Falls Water Utility · 30d connect · $4,500
Sewer: Sioux Falls Sewer / Wastewater · 30d connect · $5,500
Electric: Sioux Falls Electric Utility · 21d connect · $1,800
Gas: Sioux Falls Gas Utility · 30d connect · $1,500

Property values & taxes

Median value$295,000

Median tax$4,278/yr

Effective rate1.4%

Construction timeline

Detached build24 weeks

Conversion14 weeks

Contractor lead3 months

Realistic total: best 7mo · typical 10mo · worst 16mo

Financing

Fannie Mae ADUeligible

Insurance impact

Annual premium delta$380

Landlord policyrecommended

Umbrella threshold$1M umbrella when renting

HOA prevalence & preemption

State HOA preemptionno

South Dakota has no statewide statute that voids HOA bans on ADUs. Common-interest communities in SD are governed primarily by general nonprofit corporation law (SDCL Title 47) and by the South Dakota Condominium Ownership Act (SDCL Chapter 43-15A) for condominiums. Restrictive covenants in declarations and bylaws — including those prohibiting accessory structures or secondary kitchens — remain enforceable per their terms.

Technical envelope (climate & building code)

Climate & energy code

IECC climate zone5A

Heating degree days5,800

Cooling degree days850

Frost depth30"

Design snow load35 psf

Wind design speed100 mph

Seismic design cat.A

Annual rainfall36"

Wildfire exposurelow

Energy codeIECC

Version / adopted2015 / 2017

Building code

Base codeIRC

Version year2,015

Adopted2017

Fire sprinklernone

Egress window5.7 sqft min

Min ceiling7 ft

Attic R-valueR-49 min

Wall R-valueR-20 min

Amendments:

Amendment
Amendment

Legal history (timeline)

Current ordinance: City of Sioux Falls Municipal Code — Accessory Dwelling Units, adopted 2020-01-01, last amended 2024-04-01

2024-01-01 — City of Sioux Falls ADU code refresh (city-ordinance)
Conforming local-code amendments aligning with current South Dakota accessory-dwelling framework.
Effect: Codified permissive ADU standards consistent with state law and local zoning.

Sioux Falls Minnehaha County — county ADU rules and overlays

County ADU ordinance

Sioux Falls Minnehaha County sits in South Dakota, which has not enacted a statewide ADU preemption or by-right ADU statute. Authority over ADU zoning, setbacks, parking, size limits, owner-occupancy, and permitting therefore rests with the local jurisdiction. The county adopts its own zoning ordinance for unincorporated territory, and each incorporated municipality inside the county adopts its own.

State-floor overlay: No South Dakota statewide ADU preemption is in force as of 2026-04-27. The county and its incorporated municipalities retain full authority over ADU zoning and permitting.

County regulatory overlays

Sioux Falls Minnehaha County administers flood-hazard, and (where mapped) coastal, wildland-fire, historic, and airport overlays that shape ADU project feasibility. The most consistent overlay across the county is FEMA NFIP floodplain regulation; other overlays apply to specific geographies inside the county.

FEMA NFIP Special Flood Hazard Areas in Sioux Falls Minnehaha County — A new ADU in a mapped SFHA must be elevated to or above the Base Flood Elevation; cost impact on the project is often material.
Historic districts and individually-listed historic resources

County permitting (unincorporated parcels)

Sioux Falls Minnehaha County issues building permits for parcels in unincorporated territory through its development services / planning department, with separate review tracks for zoning conformance, building-code compliance, on-site sewage where applicable, floodplain compliance, and addressing. Inside incorporated municipalities, city departments handle their own permits; the county's authority is geographically limited to unincorporated territory. An ADU permit application is typically processed as a residential building permit with a zoning verification step against the county's ordinance for the parcel's zoning district.

DepartmentSioux Falls Minnehaha County Development Services / Planning Department

Federal (United States) — ADU-relevant rules and programs

Federal ADU law

The United States has no federal statute that directly regulates accessory dwelling unit entitlement or design. Land-use authority over ADUs resides with states and local governments under the traditional police power. Federal engagement is limited to financing (Fannie/Freddie/FHA/VA/USDA), flood insurance (FEMA/NFIP), and discretionary housing programs (HUD), which are recorded in sibling sections of this file.

Federal financing programs

Federal housing-finance agencies and GSEs set nationwide underwriting rules that govern whether an ADU can be financed, appraised, and counted toward mortgage qualifying income. The relevant actors are Fannie Mae, Freddie Mac, FHA (HUD), VA, and USDA Rural Development.

Federal tax credits

There is no ADU-specific federal tax credit. ADUs may incidentally qualify for existing federal energy-efficiency and clean-energy tax credits when the ADU construction includes qualifying measures.

Federal housing programs

HUD administers several discretionary programs that can fund ADU-related activity at the grantee's election, but none is an ADU-specific program.

ZIP Codes

57103
57104
57105
57106
57107
57110
57117

Post Office

320 S 2nd Ave, 57104
4709 S Technopolis Dr, 57106