Bolthole Index

Brookings County, South Dakota

Building permits, zoning and septic rules in Brookings County, South Dakota

45Index Score / 100
#49 of 66 in South Dakota

Unincorporated Brookings County, South Dakota requires a building permit before constructing, moving or altering a building, with limited exemptions for small structures and specified repair work1. The County Development Department administers county zoning and building permits2. South Dakota sets the minimum onsite-wastewater standards, while Brookings County may impose stricter local requirements3.

At a glance

Building permit
Required for construction, movement or alteration of buildings in unincorporated Brookings County, subject to limited exemptions1
Zoning
Yes; zoning districts cover unincorporated Brookings County, while joint-jurisdiction and municipal rules can differ45
Building codes
The county adopted the 2021 International Residential Code and International Building Code for covered projects6
Septic
South Dakota DANR sets minimum standards; state review is limited for a conventional individual residential system37
RV living
A general private-land occupancy rule could not be confirmed; ask County Development about the parcel and district2
Tiny home
No specific occupancy rule was confirmed; county zoning and adopted building codes still apply46
Owner-builder
Qualifying resident owners have an electrical-licensure exemption, but still need a homeowner permit and inspections8

Who to call

Planning & zoning

Brookings County Development Department

Planning and zoning, building permits and inspections, drainage and floodplain development in unincorporated Brookings County

605-696-8350

[email protected]

520 3rd St, Ste 110, Brookings, SD 57006

Septic permits

South Dakota Department of Agriculture and Natural Resources

State onsite-wastewater installation standards and review of systems that require plans

(605) 773-4647

[email protected]

523 E Capitol Ave, Pierre, SD 57501-3182

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 Brookings County, South Dakota?

Yes. Unincorporated Brookings County requires a building permit before excavation or construction begins and before a building or accessory building is moved or altered1. A structure at or below 120 square feet is exempt, as are shingling, replacement siding, window replacement, exterior painting and interior improvements that do not move load-bearing walls1. Covered projects must wait until the permit is issued and displayed1. Brookings County has adopted the 2021 International Residential Code and the 2021 International Building Code for the residences, additions, garages, agricultural snow-load structures and manufactured-home requirements it administers6. The statewide farmstead exclusion from South Dakota's default design standard does not erase Brookings County zoning, permits or locally adopted building requirements9.

Who issues building permits in Brookings County, and how do you reach them?

The Brookings County Development Department is the first call for planning, zoning and building-permit questions on unincorporated land2. Reach the department at 605-696-8350 or [email protected], or visit 520 3rd St, Ste 110, Brookings, SD 570062. Permit applications require a dimensioned sketch or scale plan, the proposed building use, water and sewer information, and anything else the County Zoning Official needs to review the project1. New residences and residential additions receive three onsite inspections before occupancy; garages and agricultural-building snow loads are inspected after completion10. The county charges $100 per building inspection, with the number of inspections determined when the permit is issued11. Electrical and plumbing requirements remain separate state processes1213.

Does Brookings County have zoning for RVs, tiny homes and setbacks?

Yes. Brookings County divides its unincorporated land into zoning districts, and district-specific use and dimensional rules apply414. The City of Brookings and county also have an area of joint zoning authority, so confirm which jurisdiction controls the parcel before relying on the county ordinance alone5. South Dakota zoning authority allows counties to regulate structure size, lot coverage, yards, population density and land uses, which is why setbacks and allowed uses must be checked by district15. We could not confirm a general minimum dwelling size, accessory-dwelling rule, or private-land RV and tiny-home occupancy rule for unincorporated Brookings County; ask the County Development Department about the parcel's district and intended use2. A variance or conditional-use approval may be relevant, but the correct path depends on that district14.

How do septic permits work in Brookings County?

South Dakota DANR sets the minimum onsite-wastewater requirements that apply in Brookings County, and local governments may adopt stricter standards3. Contact DANR before installing a new system unless it is a conventional onsite system serving an individual residence; systems receiving human waste other than a conventional individual onsite system require plans and specifications submitted to DANR7. The DANR onsite-wastewater contact number is (605) 773-464716. Site conditions deserve early attention: only about 1.3% of Brookings County soils are rated without severe limitations for a conventional septic drain field, so a site evaluation may materially affect the design and budget17. Brookings County-specific septic inspection requirements could not be confirmed; ask DANR and the County Development Department what review applies to the proposed system before hiring an installer162.

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

Brookings County has zoning across its unincorporated area, but a general rule allowing or prohibiting full-time RV living on private land could not be confirmed4. A general temporary-camping rule and a tiny-home-specific occupancy rule also could not be confirmed. Ask the Brookings County Development Department whether the parcel's zoning district allows the proposed dwelling type, whether a conditional use is needed, and what setbacks apply214. A tiny home treated as a residence remains subject to the county's adopted residential code and permit process where applicable61. For sanitation where water or electricity is unavailable, South Dakota recognizes specified unconventional systems, but most are experimental systems requiring state approval of plans before installation18.

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

  1. Confirm that the parcel is governed by unincorporated-county zoning rather than a municipality or joint-jurisdiction area5.
  2. Ask the County Development Department for the zoning district, allowed use, setbacks and required approvals214.
  3. Evaluate wastewater and well feasibility; DANR review depends on the septic design, and a water-right permit may be required for the proposed well use719.
  4. Obtain any needed floodplain development permit before work in a mapped special flood-hazard area20.
  5. Submit the building-permit application with the site sketch, use and utility information, and do not begin until the permit is issued and displayed1.
  6. Schedule county building inspections and separate state electrical and plumbing inspections101213.
  7. If access is from a state highway, secure the South Dakota DOT access permit before the county issues the building or use permit21.

What should you check before buying land in Brookings County?

Start with jurisdiction and zoning: incorporated places and the City of Brookings joint-jurisdiction area may not follow the same process as ordinary unincorporated county land5. Check the county zoning map, then verify the district, setbacks and allowed uses with the County Development Department142. Review flood mapping because development in a special flood-hazard area needs a county development permit20. Test wastewater feasibility early because only about 1.3% of county soils are rated without severe limitations for conventional drain fields17. Confirm legal access, and remember that projects adjacent to a state highway can need a state access permit before plat filing or a building or use permit21. Brookings County's median property-tax bill is about $2,795 per year, with an effective rate near 1.1%, useful figures for a first-pass carrying-cost estimate2223.

Watch-outs

  • A Brookings County building permit lasts 18 months but becomes void after 6 months without substantial progress; one 6-month extension may be requested in writing at least 1 month before expiration24.
  • Mobile and manufactured homes require a tie-down inspection within 30 days after being moved onto a site10.
  • A parcel near a South Dakota state highway may need a state access permit before Brookings County can issue a building or use permit21.

Sources

  1. Brookings County Ordinance No. 2024-01, quoted and re-checked
  2. Brookings County Development Department (brookingscountysd.gov)
  3. One-Stop Permitting and Regulation Guide (2025 Edition), quoted and re-checked
  4. Planning & Zoning, quoted and re-checked
  5. Planning & Zoning, quoted and re-checked
  6. Permit Applications Information Booklet, quoted and re-checked
  7. One-Stop Permitting and Regulation Guide (2025 Edition), quoted and re-checked
  8. South Dakota Electrical Commission - Homeowner Wiring (South Dakota statewide rule), quoted and re-checked
  9. South Dakota Codified Law Chapter 11-10: Building Codes and Standards (South Dakota statewide rule), quoted and re-checked
  10. Permit Applications Information Booklet, quoted and re-checked
  11. Permit Applications Information Booklet, quoted and re-checked
  12. South Dakota Electrical Commission - Homeowner Wiring (South Dakota statewide rule), quoted and re-checked
  13. South Dakota Plumbing Commission - Inspections (South Dakota statewide rule), quoted and re-checked
  14. Planning & Zoning Ordinances & Forms, quoted and re-checked
  15. 2000 Session Laws Chapter 69 — Planning and zoning statutes revised (South Dakota statewide rule), quoted and re-checked
  16. South Dakota Department of Agriculture and Natural Resources (danr.sd.gov)
  17. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  18. Administrative Rule 74:53:01 — Individual and Small On-Site Wastewater Systems (South Dakota statewide rule), quoted and re-checked
  19. South Dakota Water Rights - Drilling a Well, quoted and re-checked
  20. Brookings County Ordinance No. 2024-01, quoted and re-checked
  21. Brookings County Ordinance No. 2024-01, quoted and re-checked
  22. Median property tax bill: Bolthole Index county data
  23. Effective property tax rate: Bolthole Index county data
  24. Brookings County Ordinance No. 2024-01, quoted and re-checked

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.

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County locator

Brookings County in South Dakota

45
County map
Brookings County highlighted among the South Dakota counties · colored by Index score

How Brookings County scores

Seclusion67100% ev.
Self-Sufficiency1694% ev.
Admin Boringness49100% ev.
Durability53100% ev.
Property Autonomy67100% ev.
Carry Cost70100% ev.

Evidence strength: 99%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$329kTypical home
1.1%Property tax
$6,212Land / acre
26.8"Annual rain
8% of yrsSevere drought
4.1 / yr (+3.8)Mid-century 100°F days
19.8 daysMid-century dry spell
1.37" (+6.3%)Mid-century 1-day rain
1.61×Wildfire change factor
100%Forward climate coverage
$1,740Home insurance / yr
4.7% / yrInsurance growth
0.76%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
16,477People within 30 min
583,153People within 2 hr
32,792Radius comparison (15 mi)
45.4People / sq mi
8.8%Federal land
96.9%Land at 15% slope or less
1.3%Septic soil without severe limits
6,342 acWorkable land screen
2.8%Wooded land
43.5°FAvg temp

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Answers from the rulebook for Brookings County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Brookings County rules

  • Building permitRequired

    Construction, alteration, or movement of buildings and structures in unincorporated Brookings County.

    • No permit is necessary for a structure under 120 square feet or less.
    • No permit is necessary for shingling, replacement siding, window replacement, exterior painting, or interior improvements that do not move load-bearing walls.
    • Work may not commence until the permit is issued and displayed.
    • Applications require a dimensioned sketch or scale plan and information about building use and water/sewer facilities.

    permit exemption threshold: <= 120 square feet (Structures under 120 square feet or less)

    “It shall be unlawful to commence the excavation for, or the construction of, any building, structure, or any accessory building, or to commence the moving or alteration of any buildings, including accessory buildings, until the County Zoning Official has issued a building permit for such work.”
  • Building code adoptedAdopted (with conditions)

    New residences, residential additions, garages, agricultural snow-load structures, and mobile/manufactured-home tie-down requirements administered by Brookings County.

    • The booklet states that the 2021 International Residential Code and 2021 International Building Code were adopted.
    • Electrical work must comply with the National Electric Code and be inspected by the State Electrical Inspector.
    “Brookings County has adopted the 2021 International Residential Code and 2021 International Building Code”
  • InspectionsRequired

    New residences, residential additions, garages, agricultural-building snow loads, and mobile/manufactured homes in unincorporated Brookings County.

    • Residences and additions are inspected onsite three times before occupancy.
    • Garages and snow loads on agricultural buildings are inspected upon completion.
    • Mobile and manufactured homes are inspected for tie-downs within 30 days after being moved onto a site.
    • Twenty-four-hour notice is required to schedule inspections.

    inspection fee: 100 USD per inspection (Number of inspections is determined when the permit is issued) · mobile/manufactured home tie-down inspection deadline: <= 30 days (After being moved onto a site)

    “all new residences, new additions to residences, and new garages will be inspected. Residences and additions will be inspected on-site three times prior to occupancy. Garages and snow loads on agricultural buildings will be inspected upon completion. All mobile and manufactured homes will be inspected for tie downs within 30 days after being moved onto a site.”
  • County-wide zoningPresent (with conditions)

    County zoning in unincorporated Brookings County.

    • The department administers county zoning ordinances and processes building permits.
    • Incorporated municipalities and joint-jurisdiction areas may have separate or shared rules.
    “The unincorporated area of the County is hereby divided into zones, or districts, as shown on the Official Zoning Map”
  • Local zoningVaries (with conditions)

    Aggregate local zoning across Brookings County, including county zoning in unincorporated areas and City of Brookings/County joint-jurisdiction zoning; local requirements vary by jurisdiction and district.

    • This aggregate claim does not assert that Brookings County administers every municipal ordinance.
    “An Ordinance Establishing Zoning Regulations and a Zoning Map for the City of Brookings and Brookings County Area of Joint Zoning Authority”
  • Zoning districtsPublished

    Brookings County zoning districts and official zoning-map materials.

    • District-specific dimensional and use requirements apply.
    • The county ordinances page publishes a complete zoning ordinance and an official zoning map link.
    “Complete Zoning Ordinance: 2025-01 [...] Official Zoning Map (2013)”
  • Subdividing landRegulated (with conditions)

    Subdivision proposals and plats in Brookings County.

    • The Planning and Zoning Commission reviews subdivision ordinance proposals and amendments and makes recommendations to the Board of County Commissioners regarding subdivision approval.
    • Flood-related subdivision standards apply in areas subject to flood hazards.
    “To review proposals for subdivision Ordinance adoption, or amendments thereto, to determine whether such subdivisions comply with the subdivision Ordinance of Brookings County and make recommendation to the Board of County Commissioners relating to the approval of subdivisions.”
  • Driveway accessLimited

    Proposed uses and structures adjacent to a South Dakota state highway.

    • A South Dakota Department of Transportation access permit is required before filing a plat or issuing a building/use permit.
    • The cited rule is district/use-specific, not countywide for every driveway.
    “For all proposed uses and structures adjacent to a State highway, an access permit from the State of South Dakota Department of Transportation shall be required prior to the filing of a plat or the issuance of a building/use permit.”
  • Building in a floodplainRequired

    Construction or development within an area of special flood hazard established by the Brookings County zoning ordinance.

    • The application may require scaled plans, elevations, proposed structures, fill, storage, drainage facilities, and watercourse information.
    • The Zoning Officer administers the regulations and grants or denies development permits.
    • Adverse effects may require technical justification by a registered professional engineer.
    “A development permit shall be obtained before construction or development begins within any area of special flood hazard established in Section 4.05.04.2”
  • Permit feesPublished (with conditions)

    Brookings County building inspection fees.

    • The number of inspections is determined when the permit is issued.
    • The ordinance separately states that the Board of County Commissioners establishes a fee schedule by resolution.

    building inspection fee: 100 USD per inspection (Paid when building permit is issued)

    “BUILDING INSPECTION FEE SCHEDULE (To Be Paid When Building Permit is Issued) $100.00 per inspection # of inspections determined when permit is issued.”
  • Permit processPublished (with conditions)

    Brookings County building-permit application and issuance process.

    • Applicants submit a dimensioned sketch or scale plan, building-use information, water/sewer-facility information, and other information required by the County Zoning Official.
    • The permit must be issued before work begins and displayed on the premises.
    • Permits are valid for 18 months, become void after six months unless substantial progress has been made, and may receive one six-month extension requested in writing at least one month before expiration.

    permit validity: 18 months (Permit becomes void after six months unless substantial progress has been made) · extension: 6 months (One extension, requested in writing at least one month before expiration)

    “All building permits shall be valid for eighteen (18) months after the date of issuance; however, a building permit shall become void six (6) months from the date of issuance unless substantial progress has been made by that date on the project described therein. A six (6) month extension may be granted if requested in writing at least one (1) month prior to the expiration date.”

South Dakota rules that apply here

  • Owner-builder exemptionAvailable (with conditions)

    An individual owner personally installing electrical wiring and fixtures in a residence or farmstead owned and resided in by that individual.

    • The exemption is from electrical licensure requirements, not from permitting or inspection.
    • An approved homeowner permit must be obtained before electrical work begins.
    • The exemption does not apply to commercial or rental property.
    • Mobile-home and modular-home installations are allowed only when the unit is on an owner-occupied lot at the time of installation; otherwise a licensed South Dakota electrical contractor is required.
    • A final inspection is required before occupancy.
    “an "owner's exemption" as an exemption from licensure requirements”
  • Who permits septicState (with conditions)

    On-site wastewater systems in South Dakota, including Brookings County.

    • State requirements are minimum standards.
    • Local governments may impose more stringent regulations.
    • Plans and specifications must be submitted to DANR for installations receiving human excreta other than a conventional individual on-site system.
    “The authority for regulating on-site wastewater systems is found in SDCL Chapter 34A-2. The regulations are in the ARSD Articles 74:53:01. These regulations are the state’s minimum requirements and standards, but local governments may have more stringent regulations.”
    One more reviewed finding on this topic
    • State — Individual and small on-site wastewater systems statewide in South Dakota.
      “The authority for regulating on-site wastewater systems is found in SDCL Chapter 34A-2.”
  • Septic permitLimited

    New or modified on-site wastewater systems in Brookings County subject to state review.

    • DANR should be contacted before installation of any new on-site system except a conventional on-site system serving an individual residence.
    • Plans and specifications must be submitted for systems receiving human excreta other than a conventional individual on-site system.
    • Works of sanitary significance require submission at least 30 days before planned construction.

    advance submission period: >= 30 days (Works of sanitary significance)

    “Plans and specifications must be submitted to DANR for any installation that will receive human excreta other than a conventional individual onsite system”
  • Off-grid sanitationAllowed (with conditions)

    Unconventional off-grid sanitation systems where a water or electrical system is unavailable statewide.

    • Vault privies, chemical toilets, incinerator toilets, or composting units must be used when a water or electrical system is unavailable.
    • Except for vault privies, all unconventional systems are experimental systems and require plans and specifications submitted to the secretary for approval before installation.
    “all unconventional systems are considered experimental systems”
  • Well permitLimited

    Water-well drilling and proposed water uses statewide in South Dakota.

    • A water-right permit is required only for proposed water uses that fall within the permitting requirements; the official page directs applicants to the Using Water in SD page to determine whether a permit is needed.
    • When a water-right permit is required, state law requires approval before well drilling.
    • The chief engineer may permit construction of a test well before obtaining the water-right permit; the test well may serve as the production well if the application is approved.
    • A water-right permit, when required and approved, provides five years to construct the water-use system and an additional four years to place all water to beneficial use.
    • A well driller's license is required before drilling any well or contracting to drill a well.

    construction period after water-right permit approval: 5 years · period to place water to beneficial use: 4 years

    “If a water right permit is needed, state law requires the permit to be approved prior to doing any well drilling.”
    One more reviewed finding on this topic
  • Agricultural exemptionAvailable (with conditions)

    Farmsteads and accessory structures or buildings thereto under South Dakota's default construction-design standard when the local unit of government has not adopted an ordinance prescribing standards under SDCL 11-10-5.

    • The default standard applies to building work commenced after July 1, 2026.
    • The local unit of government may adopt an ordinance allowing local administration and enforcement of the design standard.
    • The exclusion is from SDCL 11-10-6's default 2024 International Building Code design standard; it does not establish that all local zoning, building, occupancy, or other requirements are waived.
    • The statute defines farmstead as a farm or ranch, including any structure or building located on the land.
    • Residential structures and mobile or manufactured homes are also excluded from this specific default-standard provision.

    construction commencement date: > 2026-07-01 (The provision applies to buildings commenced after July 1, 2026.) · building standard: 2024 International Building Code (The default standard does not apply to a farmstead or accessory structure or building thereto.)

    “farmstead and any accessory structure or building thereto.”
  • county zoning authorityGeneral

    South Dakota county boards' authority to adopt zoning ordinances, including for unincorporated county land.

    • The authority is granted for promoting the health, safety, or general welfare of the county.
    • The statute authorizes regulation of building and land-use characteristics including height, number of stories, building and structure size, lot coverage, yards, courts, open spaces, population density, and locations and uses of buildings, structures, and land.
    • The authorized purposes expressly include trade, industry, residence, flood plain, and other purposes.
    • This claim identifies statewide enabling authority; whether a particular county has adopted an ordinance is a separate local question.
    “For the purpose of promoting health, safety, or the general welfare of the county the board may adopt a zoning ordinance to regulate and restrict the height, number of stories, and size of buildings and other structures, the percentage of lot that may be occupied, the size of the yards, courts, and other open spaces, the density of population, and the location and use of buildings, structures, and land for trade, industry, residence, flood plain, or other purposes.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Certificate of occupancy — Certificate-of-occupancy requirements for Brookings County buildings.
  • Minimum dwelling size — Minimum dwelling size in unincorporated Brookings County.
  • Living in an RV — Long-term or residential recreational-vehicle occupancy on private land in unincorporated Brookings County.
  • Camping on your land — Temporary camping outside an approved campground in unincorporated Brookings County.
  • Tiny homes — Tiny-home occupancy in unincorporated Brookings County.
4 more unanswered
  • Accessory dwellings
  • Septic inspection
  • Mandatory utility hookup
  • Short-term rentals

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Living off-grid in Brookings County, South Dakota

Is Brookings County a good place to live off-grid or homestead?

Brookings County scores 45/100 on the Bolthole Index, a marginal county profile. Its strengths: manageable long-term carry cost and a stronger property-autonomy legal backdrop. Watch-outs: workable self-sufficiency basics (26.8″/yr rainfall).

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

Brookings County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by South Dakota Department of Agriculture & Natural Resources (DANR). Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

How much does land cost in Brookings County, South Dakota?

Land in Brookings County runs about $6,212 per acre, based on the latest county data.

What is the water situation in Brookings County?

Brookings County gets about 26.8" of rain a year, with severe drought in roughly 8% of years.

How remote is Brookings County?

A representative private-land location has about 16,477 people within a 30-minute drive and 583,153 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

Off-grid gear

Going off-grid in Brookings County means bringing your own water and power. The kit we’d start with:

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How Brookings compares in South Dakota

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