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

Yes. Unincorporated Davison County requires a building permit before construction of any permanent structure, while inside Ethan, Mount Vernon and Mitchell the city issues building permits¹. The broader ordinance also requires approval before concrete is poured, infrastructure is installed, a structure is demolished, moved or enlarged, or a use changes; driveway concrete is excluded when no structure will sit on it². The permit must conform to zoning unless the required written approval for an administrative review, conditional use, variance or zone change has been issued². Starting without a permit can mean double the original fee plus lost property taxes and interest². Agricultural land is not automatically permit-free². Davison County sources do not state a general construction-code adoption, routine inspection sequence or certificate-of-occupancy process, so ask Planning and Zoning what plans and closeout steps apply¹.

Davison County Planning and Zoning issues county building permits and handles zoning questions, addresses, plats, conditional uses and variances¹. The office is in the Davison County Courthouse at 200 E 4TH AVENUE, MITCHELL, SD 57301, and its published phone numbers are (605) 995-8615 and (605) 995-8640¹. Building permit fees vary by construction type, so ask the office which charge applies; the 2026 schedule also lists $150 for a variance and for a conditional use, and $100 for plat consideration^1,4. County jurisdiction does not cover every address: Ethan, Mount Vernon and Mitchell use their city offices for building permits and zoning approval, while Mitchell administers its extraterritorial district¹. County septic rules and state DANR standards apply regardless of the city line². Give staff the parcel location or legal description so they can identify jurisdiction, district, setbacks, application and fee¹.

Yes. Davison County zoning applies in unincorporated areas, including Loomis, but excludes Ethan, Mount Vernon and Mitchell; Mitchell also controls its extraterritorial district^1,2. The ordinance creates nine district types, and the signed map in the Zoning Administrator's office is the final authority on a parcel's designation¹. In the Agricultural District, a residence generally needs 25 acres and 150 feet of lot width, subject to grandfathering and listed variance routes². Agricultural District setbacks are generally 75 feet from public rights-of-way and 50 feet at the side and rear, while other districts use different schedules². Manufactured homes are permitted principal structures in the Agricultural District but require conditional-use approval in Rural Residential².

Septic systems anywhere in Davison County must comply with South Dakota DANR requirements and the State Plumbing Code, while county zoning adds local siting, lot-size and review rules². A water-carriage system using a private water supply on the same lot generally requires at least 43,560 square feet; qualifying public water, off-lot private water or hauled water stored in a cistern can reduce that threshold to 20,000 square feet when state separation rules are met². Those lot-size rules do not apply when wastewater goes to a holding tank or an unconventional system permitted under the cited state rule². Ask County Planning and Zoning and DANR to identify the review path before installation because a universal permit and inspection process for every residential system was not confirmed^1,5. Only 1.1% of Davison County soils are rated without severe limitations for a conventional drain field, so obtain a site-specific evaluation early⁶.

We could not confirm a Davison County rule that directly allows or prohibits long-term RV occupancy or temporary camping on private land. Ask Planning and Zoning how the parcel's district treats RV occupancy, hookups and living onsite during construction¹. We also could not confirm a special tiny-home rule or a general minimum dwelling floor area. A tiny home intended as a permanent structure still needs county permit and zoning review in unincorporated areas¹. Manufactured homes have clearer rules: they are permitted principal structures in the Agricultural District, require conditional-use approval in Rural Residential, and remain subject to district lot size, setbacks and floodway limits². Planned developments and subdivisions must use a DANR-approved water system, but no countywide mandatory utility-connection rule was confirmed².

1. Confirm whether the parcel is under Davison County, a city or Mitchell's extraterritorial jurisdiction¹.

1. Ask Planning and Zoning for the zoning district, allowed residential use, setbacks, plat status and fee; Agricultural District homes generally face a 25-acre lot and 150-foot width requirement, subject to exceptions^1,2,4.

1. Evaluate water and wastewater under both county siting rules and state standards².

1. If creating a parcel, hire a registered South Dakota land surveyor and follow the city, county or combined plat-approval route that applies to the location².

1. Obtain the building permit before construction, then begin within 180 days and substantially complete the project within 2 years unless an extension is granted¹.

1. Arrange plumbing, electrical and access approvals; subdivision access needs written approval from the appropriate highway or street authority before the plat is filed^1,3,7.

Confirm the parcel's governing jurisdiction, zoning district, lot dimensions, buildable area and legal access before closing because authority and dimensional rules vary by location^1,2. Investigate wastewater feasibility early: only 1.1% of county soils are rated without severe limits for a conventional drain field⁶. Planned developments and subdivisions need a DANR-approved water system, while other sites may use qualifying private or cistern supplies under the county's wastewater siting rules². For a private well, determine whether the intended water use requires a state water-right permit before drilling, and expect to submit a water sample from each new domestic well to the state Department of Health Laboratory or another approved laboratory⁸. A new driveway needs an Approach Application taken to the County Highway Shop with a $25 fee; ask the appropriate road authority about access before platting a subdivision¹. No residential structure, including a manufactured or modular home, may be placed in a floodway without meeting the county Flood Damage Prevention Ordinance criteria, and floodplain development needs a Floodplain Development Permit with a flood proof plan^1,2. The effective property-tax rate is about 1.2%, and the median annual property-tax bill is about $2,361⁶.