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

At a glance

Building permit

Required for most construction; limited small-structure and agricultural exceptions apply¹

Zoning

Countywide Zoning Ordinance, administered by the Planning Department⁴

Septic

Permitted by the Planning Department; state sets the minimum standards⁵⁶

RV living

Allowed up to 2 years as a Special Permitted Use while building a home, not open-ended³

Tiny home

"Efficiency Dwelling," max 400 sq ft; needs Conditional Use approval unless on 40+ ag-taxed acres³

Owner-builder exemption

Available for your own residence or accessory structure under County Ordinance 735⁷

Minimum lot size (Agriculture District)

10 acres³

Wells

Water-right permit required for some uses; only a licensed driller may drill⁸

Who to call

Contact details are copied from each office’s official page and were checked against it on September 27, 2026.

Do you need a building permit in Pennington County, South Dakota?

Yes. Pennington County requires a building permit before erecting, constructing, enlarging, moving or demolishing a building or structure¹. Exceptions include an accessory structure of 144 square feet or less that is not permanently anchored, a fence or border wall no taller than 8 feet, an agricultural snow fence and certain portable agricultural buildings¹. The county applies the current International Building Code, including Appendices C and I, and the current International Residential Code, with amendments approved by the Board of Commissioners⁹. County inspections include initial siting and as-built inspections, and Planning may require more verification for compliance with approved plans and ordinances¹⁰. A homeowner may personally work on the owner's residence or accessory structure without a county contractor license, subject to the limits in Ordinance 735⁷. South Dakota separately requires applicable plumbing and electrical inspections¹¹¹².

Who is the Pennington County Planning Department, and how do you reach them?

The Pennington County Planning Department enforces ordinances covering land use, construction, on-site wastewater, subdivision improvements, floodplain and water quality². The department reviews building permits, conditional uses, rezonings, subdivisions and variances². Reach the office at 605-394-2186 or [email protected], at 900 Concourse Dr., Suite 160, Rapid City, SD 57703². Applications may be submitted online, by mail or in person, but every submission must include the supporting information required by its application; after receipt, a planner contacts the applicant about payment and the request¹³. For a subdivision or plat, expect separate county review because platting is generally part of development unless the property is already platted or grandfathered, and some applications require a Planning Commission hearing¹⁴.

Does Pennington County have zoning?

Yes. Pennington County has a countywide Zoning Ordinance, administered by the Planning Department and guided by the county's Comprehensive Plan⁴. South Dakota law lets a county board adopt a zoning ordinance regulating building height, lot coverage, setbacks and land use for health, safety and general welfare, and Pennington County has exercised that authority countywide¹⁵⁴. In the county's Agriculture District, the minimum lot size is 10 acres, a single-family dwelling is allowed by right, only one dwelling is allowed per lot (with an exception for a ranch-hand residence), and the minimum front, side and rear setback for structures is 25 feet with a 35-foot maximum height³. A tiny home, called an "Efficiency Dwelling" in county code, is defined as a permanent dwelling of no more than 400 square feet on a permanent foundation with its own living, cooking, sleeping and sanitation facilities³. An Efficiency Dwelling normally needs Conditional Use approval, but is allowed by right with a Building Permit on an Agriculture-zoned lot of at least 40 acres taxed as agriculture; a tiny-home community needs a Planned Unit Development overlay instead³.

How do septic permits work in Pennington County?

Pennington County administers on-site wastewater (septic) systems through its Planning Department, while South Dakota's Department of Agriculture and Natural Resources sets the statewide minimum requirements the county's system must meet⁵⁶. State rules describe these as minimum requirements, so Pennington County's own septic rules can be stricter, not looser⁶. Soils matter here: only about 15.2% of Pennington County's soils are rated free of severe limits for a conventional septic drain field by the USDA soil survey, so plan on a site evaluation and budget for the possibility of an engineered or alternative system on much of the county's land¹⁶. If your site has no water or electrical system, South Dakota allows vault privies, chemical toilets, incinerator toilets or composting units instead of a conventional septic system, but every option except a vault privy counts as an "experimental system" that needs plans and specifications approved by the state before installation¹⁷. For the construction-permit trigger, site-evaluation requirements and application needed for a particular parcel, ask the Planning Department before installation².

Can you live in an RV or tiny home on your land in Pennington County?

Not indefinitely, and not without county review. Pennington County's Zoning Ordinance treats living in an RV as a Special Permitted Use limited to no more than two years while constructing a single-family home³. The RV's wastewater must use the property's on-site wastewater system, only one RV may serve as temporary living quarters, and the RV cannot be used as a nightly or weekly vacation rental³. A tiny home is a different land use: county code calls it an "Efficiency Dwelling," meaning a permanent dwelling of no more than 400 square feet on a permanent foundation with its own living, cooking, sleeping and sanitation facilities³. An Efficiency Dwelling normally requires Conditional Use approval; on Agriculture-zoned land containing at least 40 acres and taxed as agriculture, it is allowed with a building permit³. We could not confirm rules for general RV occupancy outside the while-building provision, temporary camping, manufactured homes or accessory dwellings, so ask Planning about the exact parcel and proposed use².

Building a home in Pennington County: the steps, in order

1. Confirm your zoning district and lot size with the Planning Department; the Agriculture District's minimum lot size is 10 acres, and other districts run smaller²³.
2. Apply for a Building Permit before you start construction, since no building or structure may be built, enlarged, altered, moved or converted in unincorporated Pennington County without one¹⁸.
3. If you are building your own home, use Pennington County's owner-builder exemption under Ordinance 735 instead of getting a contractor license, but remember you cannot act as a general contractor for hire or build more than one single-family dwelling in five years under that exemption⁷.
4. Apply for your on-site wastewater (septic) permit through the Planning Department early; with only about 15.2% of county soils rated free of severe limits for a conventional drain field, budget time and money for a site evaluation and a possible engineered system⁵¹⁶.
5. If you need a well, check whether a water-right permit applies before any drilling starts, since state law requires that permit approved before drilling when one is required, and only a state-licensed well driller may drill⁸.
6. Route your driveway access correctly: a new or modified approach onto a South Dakota state highway needs an SDDOT permit before construction begins, while an approach off a county highway or road under the county's jurisdiction needs an Approach Permit from the Highway Department instead¹⁹²⁰.
7. Schedule your trade inspections: electrical work needs at least 72 hours' notice, a rough-in inspection before it's covered, and a final inspection before occupancy, and plumbing needs its own inspection certificate and sign-off outside cities that run their own program¹²¹¹.

What to check before you buy land in Pennington County

Water: if your planned use needs a water-right permit, South Dakota law requires that permit approved before any well drilling, and only a state-licensed well driller may drill or contract to drill a well⁸. Soils and septic: with only about 15.2% of Pennington County's soils rated free of severe limits for a conventional septic drain field, budget for a site evaluation and possibly an engineered system on most parcels¹⁶. Flood: development in a mapped floodplain needs a permit, new and substantially improved homes must be elevated above the Base Flood Elevation, and Pennington County's Planning Department administers floodplain rules locally²¹². Access: confirm whether your road frontage is a county highway (an Approach Permit from the Highway Department covers a new or previously unpermitted driveway) or a state highway (which needs a separate SDDOT permit before construction)²⁰¹⁹. Public land: about 40.1% of Pennington County is federal land, so verify your parcel's boundaries against public land and don't assume neighboring open land is available to use²². Terrain and climate: about 60.3% of the county sits at 15% slope or less, the county gets roughly 19.3 inches of precipitation a year, and severe drought hits about 13.8% of years, so plan grading and water storage accordingly²³²⁴²⁵. Taxes and market: Pennington County's effective property tax rate runs about 1.1%, with a typical annual bill near $3,049, a typical home value around $368,775, and farmland running about $1,513 an acre^26272829. The nearest city of 100,000 or more people is about 264 miles away in a straight line, though Rapid City itself is the county's own hub for services³⁰.

Watch-outs

• Pennington County's Administration Building, including Planning & Zoning, has officially moved to 900 Concourse Drive, Rapid City, SD 57703; confirm that address before visiting instead of the department's former Kansas City Street location².
• Living in an RV while you build is capped at two years under a Special Permitted Use, not an open-ended right, and the RV's wastewater must run through the property's on-site system the whole time³.
• About 40.1% of Pennington County is federal land, so confirm your parcel's exact boundaries and access rights before assuming nearby open land is buildable²².

Sources

1. Pennington County Development Guide, quoted and re-checked
2. Pennington County Planning Department (pennco.org)
3. Pennington County Zoning Ordinance (PCZO), Planning Department (docs.pennco.org)
4. Pennington County Zoning Ordinance (2026 county census)
5. Pennington County Planning Department (2026 county census)
6. On-Site Wastewater Systems in South Dakota (South Dakota statewide rule), quoted and re-checked
7. Pennington County Ordinance 735 - Building Code and Contractor Licensing (2026 county census)
8. South Dakota Water Rights — Drilling a Well (South Dakota statewide rule), quoted and re-checked
9. Pennington County Development Guide, quoted and re-checked
10. Pennington County Development Guide, quoted and re-checked
11. South Dakota Plumbing Commission - Inspections (South Dakota statewide rule), quoted and re-checked
12. South Dakota Electrical Commission - Homeowner Wiring (South Dakota statewide rule), quoted and re-checked
13. Pennington County Development Guide, quoted and re-checked
14. Pennington County Development Guide, quoted and re-checked
15. 2000 Session Laws Chapter 69 — Planning and zoning statutes revised (South Dakota statewide rule), quoted and re-checked
16. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
17. Administrative Rule 74:53:01 — Individual and Small On-Site Wastewater Systems (South Dakota statewide rule), quoted and re-checked
18. Pennington County Development Guide (2026 county census)
19. Instructions: Applying for permission for driveway or intersection on a South Dakota state highway (South Dakota statewide rule), quoted and re-checked
20. Pennington County Highway Department - Permits & Ordinances (pennco.org)
21. National Flood Insurance Program (South Dakota statewide rule), quoted and re-checked
22. Federal land share: Bolthole Index county data
23. Share of land at 15% slope or less: Bolthole Index county data
24. Annual precipitation: Bolthole Index county data
25. Share of years in severe drought: Bolthole Index county data
26. Effective property tax rate: Bolthole Index county data
27. Median property tax bill: Bolthole Index county data
28. Typical home value (Zillow): Bolthole Index county data
29. Farmland value per acre (USDA census): Bolthole Index county data
30. Distance to the nearest metro area: Bolthole Index county data

Written September 27, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.