ADU Pass
Hughes County
ADU Pass helps homeowners in Hughes County, South Dakota navigate the permit paperwork for building an accessory dwelling unit. We cover 3 cities and 3 ZIP codes in this county.
Map
County ADU details
County ADU ordinance
Hughes County (state-capital county; ~17,500 residents — central South Dakota; encompassing Pierre — the state capital — Fort Pierre fringe in adjacent Stanley County, Harrold, Blunt, and unincorporated tracts in the Missouri Coteau and Missouri River valley including Lake Oahe shoreline) regulates land use in unincorporated areas through the Hughes County Zoning Ordinance, administered by the Hughes County Planning Commission. South Dakota has no statewide ADU preemption — South Dakota's stateAduLaw is netEffect 'no-statewide-law' — and the state delegates zoning authority to counties (SDCL Ch. 11-2) and municipalities. The Hughes County Zoning Ordinance permits 'accessory residential dwellings' in agricultural and large-lot residential districts (A, RA, R-1) by right on parcels of typically 1+ acres subject to size limits (commonly 1,000 sq ft or 50% of principal dwelling), one-per-lot limit, and parking. Smaller residential districts treat ADUs as conditional uses requiring Board of Adjustment approval. Pierre (population ~14,000) is the smallest US state capital by population and the dominant municipality in Hughes County.
County assessor
Assessment policy: Hughes County Director of Equalization assesses real property under SDCL Ch. 10-3 and 10-6. South Dakota assesses property at 100% of market value; the legislature establishes a target ratio (typically 85%) for the Director of Equalization Department aggregate. New ADU construction is reassessed at full market value as of November 1 following completion. South Dakota's owner-occupied classification (SDCL § 10-13-39 et seq.) provides reduced taxable value classifying owner-occupied homestead at a lower tax rate than non-owner-occupied; the elderly/disabled property tax freeze (SDCL § 10-6A) and refund (SDCL § 10-18A) provide additional relief. An ADU rented separately may carve out a non-owner-occupied component subject to the higher tax rate.
County overlays (2)
Known county issues (3)
- other — ADU economics in Hughes County are modest; rental absorption is steady but ceiling is lower than larger markets. Construction cost is elevated due to remoteness (limited contractor availability, transportation cost for materials).
- other — ADU construction on Lake Oahe shoreline parcels requires careful elevation siting and USACE coordination; some parcels cannot host ADUs.
- other — Owners should specify IRC compliance even where not mandated, to ensure financing and insurance availability.
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.