Building permits, zoning and land rules in Marshall County, South Dakota

Yes. Unincorporated Marshall County requires a permit before a qualifying building, structure or driveway is erected, moved, enlarged or structurally altered^1,3. The published triggers include improvements whose market value exceeds $3,000, any building or structure that needs additional land or area for its site, and sheds, decks or other structures of 80 square feet or larger¹. A smaller shed may avoid the building permit, but it still must meet the applicable zoning-district setbacks¹. The property owner is responsible for obtaining the permit before construction, even when the property is leased³. Failing to get a building permit before construction brings a $100 fine or 0.2 percent of construction cost, whichever is greater, on top of the normal fee⁷. Marshall County does not confirm a general owner-builder exemption from the county permit, so do not confuse South Dakota's limited homeowner electrical exemption with permission to skip the county building permit^3,5.

Marshall County Planning & Zoning/E911 Addressing/Drainage is the permit office for county building and zoning matters³. The office is at 911 Vander Horck in Britton and can be reached at (605) 448-7540 or Erin.Collins-Miles@marshall.sdcounty.gov³. A building-permit application must identify the property and proposed work, state the intended use or occupancy, and include a site plan¹. The site plan must show north, property lines, existing and proposed structures and driveways, dimensions, and exact setbacks, although the Zoning Administrator may waive submission items under the ordinance's stated exception¹. Building-permit fees are $45 for construction costing up to $25,000, $75 for $25,001 to $100,000, $130 for $100,001 to $300,000, $180 for $300,001 to $600,000, and $0.20 per $1,000 above that, according to the schedule effective March 10, 2026⁷. A building permit is valid for three years and must then be renewed⁷. Septic permits and state plan review are handled by DANR, not this office².

Marshall County zoning applies in unincorporated areas; incorporated municipalities are outside the county ordinance, while specified areas near Britton have joint county-city administration¹. The ordinance maps Agricultural Fringe Protection, Agricultural, Residential, Lake Front Residential, Commercial, Highway Commercial and General Industrial districts¹. Minimum lots vary by district and use; in the Residential District, single- and multi-family dwellings generally need at least 15,000 square feet and 100 feet of lot width, with separate per-unit requirements for multi-family dwellings¹. Setbacks vary by district: the Residential District requires a front yard of at least 30 feet, a rear yard of at least 7 feet and a side yard of at least 7 feet¹. One district caps coverage by all buildings at 90% of the lot, but that limit is district-specific¹. The county's agricultural exception is narrow: customary farm and animal fencing in the Agricultural District is exempt, while other fences and walls require a building permit¹. Marshall County does not confirm a general minimum dwelling floor area, ordinary building-height limit, accessory-dwelling-unit rule or broad agricultural-building permit exemption; ask Planning & Zoning before relying on any of those uses³.

On-site wastewater systems in Marshall County are regulated under South Dakota's statewide requirements, which are minimum standards that local governments may make more stringent^2,4. A conventional individual on-site system may be designed and installed under the rules without submitting project plans to DANR, but other systems receiving human waste require state plan review and approval before construction². DANR or its authorized representative may inspect an on-site system at any time, although the rule does not make inspection a universal prerequisite for every individual system⁸. Site feasibility deserves early attention: only 8.4% of Marshall County soils are rated without severe limitations for a conventional drain field, so make the soil evaluation a purchase contingency rather than assuming a standard field will work⁶. Contact DANR for the review and inspection path that applies to the proposed design⁴.

We could not confirm a Marshall County rule that generally allows or prohibits long-term RV occupancy, temporary camping on private land, or tiny-home occupancy. County zoning applies in unincorporated areas, so the absence of a specific answer is not permission to move in; ask Planning & Zoning about the parcel's zoning district, dwelling classification, setbacks, utility requirements and whether occupancy during construction is allowed^1,3. South Dakota separately allows certain unconventional sanitation systems when water or electricity is unavailable, but chemical toilets, incinerator toilets and composting units are treated as experimental systems that need state approval before installation; that sanitation rule does not itself authorize residential RV or tiny-home use⁹. No county minimum dwelling floor area was confirmed, so ask the same office for a written answer before ordering a tiny home³.

1. Ask Marshall County Planning & Zoning to confirm that the parcel is in the county's jurisdiction, identify its zoning district and lot standards, and determine whether the proposed home and any temporary RV use are allowed^1,3.
2. Lay out the house and driveway, then prepare the permit application and site plan showing property lines, structures, dimensions and exact setbacks¹.
3. Apply at the Zoning Administrator's office before construction begins and confirm the current fee from the construction-cost schedule^1,3,7.
4. Coordinate a qualifying county-road or right-of-way driveway with the county; access to a state highway requires South Dakota Department of Transportation permission before construction^1,10.
5. Evaluate the septic site, determine whether DANR plan review is required and ask what inspection will apply^2,6,8.
6. Arrange state electrical and plumbing approvals: qualifying homeowner electrical work still needs a permit and final inspection, while plumbing outside cities with their own inspection systems requires a state inspection certificate^5,11.

Start with jurisdiction, zoning, access, septic feasibility and flood exposure. Marshall County Planning & Zoning can identify the zoning district and county permit path for unincorporated land, while the road authority depends on whether access meets a county, township or state road¹. Only 8.4% of county soils lack severe limits for a conventional drain field, despite 93.2% of the land having a slope of 15% or less, so gentle ground does not guarantee an easy septic site⁶. A development permit is required in a floodplain where the applicable South Dakota community participates in the National Flood Insurance Program, but participation and administration differ between incorporated and unincorporated areas; ask Planning & Zoning about the parcel rather than assuming the county process^3,12. For water, determine whether the proposed use needs a state water-right permit before drilling a well¹³. The county's effective property-tax rate is about 0.9%, with a median annual bill of about $1,336⁶.