Bolthole Index

Platte County, Wyoming

Building permits, zoning and land rules in Platte County, Wyoming

47Index Score / 100
#21 of 23 in Wyoming

Unincorporated Platte County, Wyoming has no county building-code requirements and no building permit for an ordinary home; a Construction Certificate is required only when total project value reaches $1,000,00012. County zoning approval still controls land use and siting, and septic permits come from Wyoming DEQ rather than the county34. Start with Platte County Planning and Zoning before fixing a house location or access point5.

At a glance

Building permit
Construction Certificate at $1,000,000 total project value or higher6
Building code
No county building-code requirements in unincorporated areas7
Zoning
Yes — all otherwise-unzoned unincorporated land is RAM3
Septic
Wyoming DEQ permit authorization is required before construction48
Water well
State Engineer permit required before drilling9
RV or tiny home
Travel-trailer parks are regulated; private-parcel occupancy is unconfirmed105
Manufactured home
One mobile home per lot is allowed in Class I residential land11

Who to call

Planning & zoning

Platte County Planning and Zoning

Land-use regulations, rural addresses, and support for the Planning and Zoning Commission

(307)322-1330

planner@plattecountywyoming.com

800 9th Street, PO Box 728, Wheatland, WY 82201

Septic permits

Wyoming DEQ Water Quality Division — Small Wastewater Systems

Permits to construct small wastewater facilities in Platte County

Roads & driveways

Platte County Road and Bridge

County-road encroachment licenses and county-road maintenance

307-322-3113

mbolin@plattecountywyoming.com

23 Main Drive, Wheatland, WY 82201

Contact details are copied from each office’s official page and were checked against it on October 9, 2026.

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

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Do you need a building permit in Platte County, Wyoming?

For ordinary construction below the county threshold, unincorporated Platte County has no adopted building-code requirements and does not require the high-value Construction Certificate76. A Construction Certificate is required when the total project value is $1,000,000 or higher; its published fee is 0.5% of only the amount above $1,000,000, subject to a $200 minimum, and Road and Bridge approval is also required; the county may also require a road use agreement to address infrastructure impacts212. Incorporated towns can have their own building codes and permits, so the county answer does not control a site inside town limits, while Wyoming DEQ septic permits and State Engineer well permits apply county-wide1413. County zoning, septic, well, driveway and floodplain requirements remain separate from building-code review38131415. Platte County has not confirmed a separate county building-inspection program or certificate-of-occupancy requirement; ask Planning and Zoning about the specific parcel and project5.

Who handles Platte County building permits and how do you reach them?

Platte County Planning and Zoning administers the county land-use regulations, assigns rural addresses and supports the Planning and Zoning Commission165. Reach the office at (307)322-1330 or planner@plattecountywyoming.com, or visit 800 9th Street, PO Box 728, Wheatland, WY 822015. Ask that office to confirm the zoning district, allowed use, site-plan needs and whether a Construction Certificate applies5. A site plan must show the driveway location; county-road encroachments go through Platte County Road and Bridge, while state-highway encroachments go through WYDOT Right-of-Way14. Road and Bridge can be reached at 307-322-3113 or mbolin@plattecountywyoming.com at 23 Main Drive, Wheatland, WY 8220117. Platte County has not confirmed a general county building inspection or occupancy-certificate process, so ask Planning and Zoning to identify any project-specific review before work starts5.

Does Platte County, Wyoming have zoning?

Yes. Platte County regulates land use in the unincorporated county, and any unincorporated area not otherwise zoned is designated Ranching, Agriculture and Mining, or RAM318. Residential districts have specific lot and setback standards. Where public water and wastewater serve the lot, the minimum lot area in the Class I and Class II residential districts is 7,000 square feet; with one individual water or wastewater system it is one-half acre, and where both are individual it is 1 acre, still subject to soil capability.19 Class I setbacks are 25 feet from the public right-of-way at the front, 10 feet at the side and 6 feet at the rear.20 RAM structures must be at least 30 feet from public roadway easements or rights-of-way and 25 feet from property lines, and the county repealed the RAM minimum lot area in 2023.2019 Class II buildings are generally limited to 40 feet, with a special permit required above that height and fire-fighting capability still controlling21. Confirm the parcel's mapped district with Planning and Zoning before relying on any dimensional standard5.

How do septic permits work in Platte County?

Wyoming DEQ, not Platte County, is the permitting authority for small wastewater facilities in Platte County422. The general permit covers installation, repair or replacement of individual or commercial sewage-disposal systems treating less than 2,000 gallons of domestic sewage per day8. Construction cannot begin until the permitting authority issues authorization, and a Certificate of Completion is due when installation is complete822. Only 48.3% of Platte County soils are rated without severe limitations for a conventional septic drain field, so make septic feasibility an early parcel-level question rather than assuming a standard leach field will work23. The reviewed rules do not confirm a distinct inspection requirement or a general alternative for off-grid sanitation. Ask DEQ what site evaluation, design, completion documentation and inspection apply to the proposed system22.

Can you live in an RV or tiny home in Platte County?

Platte County regulates travel-trailer parks, including developments for seasonal recreation-oriented campers and recreational vehicles; park plans require Wyoming DEQ review and approval10. That park rule does not answer whether someone may live in an RV on an ordinary private parcel, and Platte County has not confirmed a general rule for that use. Platte County also has not confirmed a distinct tiny-home category or a countywide minimum dwelling-floor-area requirement. Class I residential rules allow one mobile home per lot, while mobile-home subdivisions require a Special Use Permit and compliance with the county subdivision regulations11. In the RAM district, an accessory dwelling is allowed only when accessory to a preexisting commercial, industrial or general agricultural operation24. Ask Planning and Zoning how the proposed unit is classified and what approvals apply5. Any septic system still needs DEQ authorization before construction8.

What are the steps to build a home in Platte County, Wyoming?

  1. Ask Platte County Planning and Zoning to confirm the parcel's district, allowed residential use, lot-area standard, setbacks and site-plan requirements19205.
  1. Determine whether the project reaches the $1,000,000 Construction Certificate threshold; if it does, obtain the certificate and Road and Bridge approval before proceeding6.
  1. Apply to Wyoming DEQ for septic authorization and do not start septic construction until authorization is issued822.
  1. Submit the groundwater application to the State Engineer and receive an approved well permit before drilling; the domestic filing fee is $509.
  1. Put the driveway location on the site plan, then apply to Road and Bridge for a county-road encroachment or to WYDOT for state-highway access1417.
  1. If the site is in a special flood-hazard area, ask Planning and Zoning which review and permit apply; county rules subject such development to the county floodplain resolution and federal standards, while the fee schedule lists a Floodplain Development Permit155.

What should you check before buying land in Platte County?

Start with legal access, zoning and wastewater feasibility. Wyoming's large-parcel rule generally requires parcels of 35 acres or more to have binding, recordable ingress, egress and utility easements at least 40 feet wide to a public road unless the buyer specifically waives that protection in a binding, recordable document25. Platte County receives about 14.4 inches of precipitation annually and has experienced severe drought in about 21.5% of years, so verify water rights, well-permit prospects and expected yield before treating a well as assured2627. About 48.3% of county soils avoid a severe conventional-drain-field limitation, making soils and DEQ septic review material to the budget23. The effective property-tax rate is about 0.6%, and the median annual property-tax bill is about $1,4642829. Check the flood map and whether access joins a county road or state highway; special flood-hazard development and the two road systems follow different approval paths1514.

Watch-outs

  • No county building code does not mean no county rules: zoning, setbacks, septic, wells and road access can still control the project7381314.
  • Travel-trailer park rules do not establish whether RV living is allowed on an ordinary private parcel; ask Planning and Zoning about the parcel and proposed use105.
  • Wyoming lets an owner act as general contractor on the owner's primary residence, but local approvals may still apply and electrical work remains subject to state licensing and permit requirements30.

Sources

  1. plattecountywyoming.com, quoted and re-checked
  2. plattecountywyoming.com, quoted and re-checked
  3. Rules & Regulations, quoted and re-checked
  4. Small Wastewater Systems, quoted and re-checked
  5. Platte County Planning and Zoning (plattecountywyoming.com)
  6. plattecountywyoming.com, quoted and re-checked
  7. plattecountywyoming.com, quoted and re-checked
  8. Small Wastewater Systems, quoted and re-checked
  9. seo.wyo.gov (Wyoming statewide rule), quoted and re-checked
  10. Land Use Rules and Regulations, quoted and re-checked
  11. LAND USE RULES AND REGULATIONS, quoted and re-checked
  12. PLATTE COUNTY PLANNING & ZONING FEE SCHEDULE, quoted and re-checked
  13. plattecountywyoming.com, quoted and re-checked
  14. FAQ's, quoted and re-checked
  15. Land Use Rules and Regulations, quoted and re-checked
  16. Planning and Zoning, quoted and re-checked
  17. Platte County Road and Bridge (plattecountywyoming.com)
  18. LAND USE RULES AND REGULATIONS, quoted and re-checked
  19. LAND USE RULES AND REGULATIONS, quoted and re-checked
  20. LAND USE RULES AND REGULATIONS, quoted and re-checked
  21. plattecountywyoming.com, quoted and re-checked
  22. Wyoming DEQ Water Quality Division — Small Wastewater Systems (deq.wyoming.gov)
  23. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  24. LAND USE RULES AND REGULATIONS, quoted and re-checked
  25. Wyoming Statutes, Title 18 (Wyoming statewide rule), quoted and re-checked
  26. Annual precipitation: Bolthole Index county data
  27. Share of years in severe drought: Bolthole Index county data
  28. Effective property tax rate: Bolthole Index county data
  29. Median property tax bill: Bolthole Index county data
  30. Startup Resources — Wyoming Business Council (Wyoming statewide rule), quoted and re-checked

Written October 9, 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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Compared with neighboring counties

Unlike 5 of its 6 neighbors, Platte County requires a building permit only in limited cases.

RulePlatte CountyGoshen CountyAlbany CountyLaramie CountyNiobrara CountyConverse CountyCarbon County
Building permitLimitedNot requiredLimitedRequiredNot requiredNot requiredRequired
County zoningYesNoYesYesYesNoYes
Septic permitsWY DEQCounty Planning & GISCounty Planning Dept.County Div. of Env. HealthWY Dept. of Env. QualityConverse CountyWY DEQ

County locator

Platte County in Wyoming

47
County map
Platte County highlighted among the Wyoming counties · colored by Index score

How Platte County scores

Seclusion81100% ev.
Self-Sufficiency17100% ev.
Admin Boringness5790% ev.
Durability43100% ev.
Property Autonomy74100% ev.
Carry Cost87100% ev.

Evidence strength: 98%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$278kTypical home
0.6%Property tax
$1,028Land / acre
14.4"Annual rain
21.5% of yrsSevere drought
6 / yr (+5.5)Mid-century 100°F days
21.2 daysMid-century dry spell
1.15" (+10.8%)Mid-century 1-day rain
1.29×Wildfire change factor
100%Forward climate coverage
$2,005Home insurance / yr
1.9% / yrInsurance growth
0.45%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
5,690People within 30 min
576,647People within 2 hr
2,088Radius comparison (15 mi)
4.1People / sq mi
9.5%Federal land
67.8%Land at 15% slope or less
48.3%Soils rated "not limited" for septic (strict USDA rating)
550,074 acWorkable land screen
4.7%Wooded land
7.6 tonsBiomass / forest ac
47.1°FAvg temp

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Cities and towns in Platte County

Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.

Not yet researched: Town of Chugwater · Town of Glendo · Town of Hartville

Answers from the rulebook for Platte County

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

Platte County rules

  • Building permitLimited

    Structures built, placed, or erected outside town limits in Platte County.

    • A Construction Certificate is required at total project value of $1,000,000 or higher.
    • Projects at or above $1,000,000 pay 0.5% on the amount exceeding $1,000,000, with a $200 minimum.
    • Transmission lines operating at 69 kV or lower are exempt.
    • Pipelines at $1,000,000 or higher require a Construction Certificate.
    • All state regulations remain applicable.

    construction value threshold: >= 1000000 USD · construction certificate fee: per 0.5 percent of amount over threshold (minimum fee of $200)

    “A construction certificate is required for projects at $1,000,000 in total value or higher. A fee equal to 0.5% will apply only to the dollar amount exceeding $1,000,000, with a minimum fee of $200 and these projects also require approval by Platte County Road and Bridge. A road use agreement may be mandated to address infrastructure impacts.”
    One more reviewed finding on this topic
    • Limited — Structures built, placed, or erected outside town limits in Platte County.
      “A construction certificate is required for projects at $1,000,000 in total value or higher. A fee equal to 0.5% will apply only to the dollar amount exceeding $1,000,000, with a minimum fee of $200 and these projects also require approval by Platte County Road and Bridge.”
  • Building code adoptedNot adopted

    Building-code requirements for construction in unincorporated Platte County.

    • Inside town limits, the municipality must be contacted to determine whether it has adopted building-code requirements.
    “Platte County has not adopted any building code requirements (i.e. IBC) at this time. If you are building in unincorporated areas of Platte County you do not need to follow any building code requirements, but you may need to obtain a Construction Certificate.”
    One more reviewed finding on this topic
    • Not adopted — County building-code requirements in unincorporated Platte County.
      “Platte County has not adopted any building code requirements (i.e. IBC) at this time. If you are building in unincorporated areas of Platte County you do not need to follow any building code requirements, but you may need to obtain a Construction Certificate.”
  • County-wide zoningPresent (with conditions)

    Land-use and zoning regulation in unincorporated Platte County.

    • Incorporated towns may have their own municipal building and land-use rules.
    “All the unincorporated area of the County not otherwise zoned is designated as the Ranching, Agriculture and Mining Zone.”
  • Local zoningPresent (with conditions)

    County-administered land-use regulation under the Platte County Zoning Rules and Regulations.

    • The county page identifies the Planning and Zoning Department as administering county zoning regulations.
    • Rules within incorporated town limits may be administered by the applicable municipality.
    “The Planning and Zoning Department is primarily responsible for the administration of various land use regulations included in the Platte County Zoning Rules and Regulations.”
  • Zoning districtsPublished

    County zoning classifications and district standards in unincorporated Platte County.

    • The 2024 regulations were approved by the Platte County Commissioners on November 21, 2023.
    • The regulations contain district chapters including Class I Single-Family Residential, Class II Multi-Family Residential, and Class III Commercial classifications.
    “Chapter 4 - Class I Single-Family Residential Classification [...] Chapter 5 - Class II Multi-Family Residential Classification [...] Chapter 6 - Class III Commercial Classification”
  • Minimum lot sizeDistrict specific (with conditions)

    Minimum lot areas in Class I and Class II residential districts and related county zoning districts.

    • Class I: 7,000 square feet with public water and wastewater; 1/2 acre minimum with an individual water or wastewater system; 1 acre minimum where both are individual.
    • Class II: 7,000 square feet with public water and wastewater; 1/2 acre with individual water or wastewater; 1 acre where both are individual.
    • RAM minimum lot area was repealed in 2023.

    public water and wastewater minimum: 7000 square feet (Class I and Class II residential districts) · individual water or wastewater minimum: 0.5 acre (subject to soil capability) · individual water and wastewater minimum: 1 acre (subject to soil capability)

    “Seven thousand (7,000) square feet with public water and wastewater systems. If individual water or wastewater systems are proposed, the lot area shall be of adequate size for the soil to handle the effluent without causing surface or groundwater pollution, but minimum lot area shall be one-half (1/2) acre. If both individual water and wastewater systems are proposed, the lot area shall then also depend on soil capability, but minimum lot area shall be one (1) acre.”
  • SetbacksDistrict specific (with conditions)

    Setbacks for structures in county zoning districts.

    • Class I setbacks: 25 feet front from public right-of-way, 10 feet side, 6 feet rear.
    • Class II setbacks: 25 feet front, 20 feet side, 20 feet rear.
    • RAM setbacks: 30 feet from public roadway easements or rights-of-way and 25 feet from property lines.
    • More restrictive standards may control.

    Class I front setback: 25 feet (from public right-of-way) · Class I side setback: 10 feet · Class I rear setback: 6 feet · RAM roadway setback: >= 30 feet (from public roadway easements or rights-of-way) · RAM property-line setback: >= 25 feet

    “A. Front yard – 25 feet from public right-of-way B. Side yard – 10 feet C. Rear yard – 6 feet”
  • Building heightDistrict specific (with conditions)

    Building height in Platte County zoning classifications.

    • Class II multifamily buildings may not exceed 40 feet except by special permit.
    • Class I buildings are subject to firefighting capabilities except by special permit.
    • Other classifications may have different standards.

    Class II maximum building height: <= 40 feet (Except by special permit)

    “Buildings will be subject to fire-fighting capabilities of the fire-fighting organization (no building over 40 feet tall) except by special permit.”
    One more reviewed finding on this topic
    • Specified — Class II multi-family residential land.
      “Buildings will be subject to fire-fighting capabilities of the fire-fighting organization (no building over 40 feet tall) except by special permit.”
  • Living in an RVLimited

    Recreational-vehicle occupancy in county-regulated travel trailer park developments.

    • The regulation addresses developments containing seasonal recreation-oriented campers, recreation vehicles, and truck campers.
    • All travel trailer parks must comply with Platte County Subdivision Regulations.
    • All travel trailer park plans must be reviewed and approved by the State Department of Environmental Quality.
    • The source does not establish unrestricted or long-term RV occupancy on an ordinary private residential parcel.
    “All plans for travel trailer parks must be reviewed and approved by the State Department of Environmental Quality”
  • Manufactured homesLimited

    Mobile/manufactured homes in Class I single-family residential land and mobile-home developments.

    • Class I regulations allow one mobile home per lot.
    • Mobile-home subdivisions require a Special Use Permit and must comply with Platte County Subdivision Regulations.
    • Mobile-home parks have separate setbacks, spacing, utility, and access requirements.

    mobile homes per Class I lot: 1 home per lot

    “A. One (1) single-family dwelling unit per lot B. One (1) mobile home per lot”
  • Accessory dwellingsLimited

    Accessory dwelling units in the Ranching, Agriculture, and Mining (RAM) district.

    • The residential use must be accessory to a preexisting Commercial, Industrial, or General Agricultural operation.
    • Other structures or uses not listed as allowed may require a Special Use Permit or rezoning.
    “Residential uses that are accessory to a preexisting Commercial, Industrial, or General Agricultural operation, including accessory dwelling unit(s), bed and breakfast facility, home occupation, and cottage industries.”
    One more reviewed finding on this topic
    • Allowed (with conditions) — Accessory dwelling units accessory to a preexisting commercial, industrial, or general agricultural operation in the applicable RAM district.
      “Residential uses that are accessory to a preexisting Commercial, Industrial, or General Agricultural operation, including accessory dwelling unit(s), bed and breakfast facility, home occupation, and cottage industries.”
  • Subdividing landRegulated (with conditions)

    Subdivision of unincorporated land within Platte County.

    • Subdivision approval and applicable county fees are required before subdivision activity.
    • The regulations include simple-subdivision and subdivision fee schedules.
    “The following regulations shall be fulfilled for all new subdivisions, as defined in Chapter II, within the unincorporated land of Platte County. No construction of buildings or disturbance of land is allowed on subdivisions or land prior to its being recorded.”
  • Driveway accessLimited

    Driveway or road access associated with development in Platte County.

    • The county FAQ requires the access location to be shown on the site plan.
    • Encroachment on a county road requires an application through Road and Bridge.
    • Encroachment on a state highway requires an application through WYDOT Right-of-Way.
    • The source does not establish a universal driveway permit for every parcel.
    “Platte County Roads: In order to encroach on a County Road you will need to apply for an encroachment through the Road and Bridge office. State Highways: In order to encroach on a State Highway you will need to apply through the WYDOT Right-Of-Way office.”
    One more reviewed finding on this topic
    • Limited — Driveway and access information required for county development applications in unincorporated Platte County.
      “Streets/roads/highways [...] Access location (driveway) [...] In order to encroach on a County Road you will need to apply for an encroachment through the Road and Bridge office.”
  • Building in a floodplainLimited

    Development in areas of special flood hazard within Platte County.

    • Development in an area of special flood hazard is subject to Platte County Resolution #2001-04 and FEMA Title 44, Chapter 1, Code 60.3(b).
    • The cited current county regulations do not themselves state that every floodplain project requires a floodplain development permit.
    • The county fee schedule separately lists a Floodplain Development Permit and associated fees.

    Floodplain Development Permit fee: $300 plus certified mailing postage, publication, notice sign, and any engineering/professional fees USD

    “Development in an area of special flood hazard”
  • Permit feesPublished

    Platte County Planning and Zoning applications and permits.

    • The fee schedule is titled Fee Schedule 11.2025.
    • Some fees are actual cost or include certified mailing, publication, notice-sign, engineering, or professional fees.
    • The Board may review submitted project costs and deny an application if submitted costs are inconsistent with actual costs.

    Construction Certificate fee: 0.5 percent of amount over $1,000,000 (Minimum fee $200) · Floodplain Development Permit fee: 300 USD (Plus certified mailing postage, publication, notice sign, and engineering/professional fees) · Zoning Certificate fee: 20 USD · Subdivision fee: 500 USD plus $100 per lot (Plus mailing, publication, notice-sign, and professional fees)

    “A fee equal to 0.5% will apply only to the dollar amount exceeding $1,000,000, with a minimum fee of $200”
  • Permit processPartial

    County planning, zoning, construction-certificate, floodplain, septic, well, subdivision, and access-related processes.

    • Construction Certificate applications require contacting the County Planner.
    • Septic permits are submitted through Wyoming DEQ.
    • Well permits are issued through the Wyoming State Engineer's Office.
    • County-road encroachments go through Platte County Roads and Bridge; state-highway encroachments go through WYDOT Right-of-Way.
    • The county publishes a fee schedule and land-use regulations, but not every requested process was located.
    “Platte County Roads: In order to encroach on a County Road you will need to apply for an encroachment through the Road and Bridge office. State Highways: In order to encroach on a State Highway you will need to apply through the WYDOT Right-Of-Way office.”

Wyoming rules that apply here

  • Owner-builder exemptionConditional

    Owner-builder construction subject to Wyoming fire, building, existing-building, or electrical safety enforcement.

    • Municipalities and counties may apply for delegated enforcement authority.
    • Before initial delegation, the local governing body must adopt minimum standards equivalent to or more stringent than applicable state standards.
    • If the local jurisdiction fails to maintain required standards or certified inspectors, enforcement authority may revert to the state department.
    • The statute does not itself create a statewide owner-builder exemption from local licensing or permitting.
    “The state fire marshal shall delegate complete authority to municipalities and counties which apply”
    2 more reviewed findings on this topic
    • Available — An owner acting as the general contractor or performing ordinary construction work on the owner's primary residence in Wyoming.
      “Contractor licensing (except electrical) is not done by the state of Wyoming. Rather, the option to license contractors is deferred to the local jurisdiction where the construction activity is to take place.”
    • Conditional — An owner acting as the general contractor for residential construction in Wyoming.
      “Rather, the option to license contractors is deferred to the local jurisdiction where the construction activity is to take place.”
  • Certificate of occupancyLimited

    Newly constructed buildings subject to state fire-marshal plan review statewide.

    • The requirement is subject to W.S. 35-9-108(h), subsection (q), and W.S. 35-9-118.
    • It applies after new construction is completed and after the state fire marshal inspects the building and determines conformance with the plan review or amended plan review.
    • A remodeled building receives a letter of compliance rather than a certificate of occupancy.
    • No newly constructed or remodeled building may be used or occupied until the required certificate of occupancy or letter of compliance is issued.
    • The state fire marshal may order use and occupancy to cease if the building is used before issuance.
    • The state fire marshal requirement does not apply where a municipality or county has received enforcement authority under W.S. 35-9-121.
    “Except as provided under subsections (h) and (q) of this section and W.S. 35-9-118, after new construction or remodeling of buildings is completed, the state fire marshal shall inspect the building and determine conformance with the plan review or amended plan review. If he finds conformance, the state fire marshal shall issue a certificate of occupancy for a newly constructed building and a letter of compliance for a remodeled building. No newly constructed or remodeled building shall be used or occupied until the state fire marshal has issued a certificate of occupancy or letter of compliance.”
  • Who permits septicMixed (with conditions)

    Small wastewater and septic permitting statewide in Wyoming.

    • DEQ is the permitting authority for small wastewater facilities in Campbell County for commercial systems, and in Carbon, Niobrara, Platte, and Weston Counties.
    • Other jurisdictions may have different permitting authorities, forms, or additional information requirements.
    • The DEQ Water & Wastewater Program states that permits for small wastewater systems in other counties should be located through the applicable permitting authority.
    “DEQ authorizes permits to construct for small wastewater facilities, defined by Wyoming Statutes 35-11-103(c)(ix), that are located in Campbell (commercial systems only), Carbon, Niobrara, Platte, and Weston Counties where DEQ is the permitting authority. The permitting authority for other jurisdictions may require different forms or additional information.”
    3 more reviewed findings on this topic
    • State — Small wastewater and septic permitting in Platte County.
      “DEQ authorizes permits to construct for small wastewater facilities, defined by Wyoming Statutes 35-11-103(c)(ix), that are located in Campbell (commercial systems only), Carbon, Niobrara, Platte, and Weston Counties where DEQ is the permitting authority.”
    • Mixed (with conditions) — Small wastewater facilities, including septic tanks and leachfields, throughout Wyoming.
      “DEQ authorizes permits to construct for small wastewater facilities, defined by Wyoming Statutes 35-11-103(c)(ix), that are located in Campbell (commercial systems only), Carbon, Niobrara, Platte, and Weston Counties where DEQ is the permitting authority. The permitting authority for other jurisdictions may require different forms or additional information.”
    • Mixed (with conditions) — Permitting of small wastewater facilities in Wyoming; DEQ is the permitting authority in the counties and use identified by DEQ, while another permitting authority applies in other jurisdictions.
      “DEQ authorizes permits to construct for small wastewater facilities, defined by Wyoming Statutes 35-11-103(c)(ix), that are located in Campbell (commercial systems only), Carbon, Niobrara, Platte, and Weston Counties where DEQ is the permitting authority. The permitting authority for other jurisdictions may require different forms or additional information.”
  • Septic permitLimited

    Installation, repair, or replacement of individual or commercial sewage disposal systems treating less than 2,000 gallons of domestic sewage per day in Wyoming DEQ permitting jurisdictions.

    • The cited DEQ page identifies DEQ jurisdiction in Campbell County for commercial systems only and in Carbon, Niobrara, Platte, and Weston Counties.
    • The permitting authority for other jurisdictions may require different forms or additional information.
    • Construction may not commence until the permitting authority issues authorization.
    • A Certificate of Completion must be submitted to DEQ when installation is complete.

    daily domestic sewage treatment capacity: < 2000 gallons per day

    “Step 1: Review the Small Wastewater Facility General Permit, which covers the installation, repair or replacement of individual or commercial sewage disposal systems that treat less than 2,000 gallons of domestic sewage per day. See “Permitting Forms and Information” tab.”
    3 more reviewed findings on this topic
    • Required — Installation, repair, or replacement of individual or commercial sewage disposal systems treating less than 2,000 gallons of domestic sewage per day in Platte County.
      “Step 4: The permitting authority will review the submitted application package. Once approved, the permitting authority will transmit a permit to construct or a notice of coverage that authorizes construction activities. Construction may not commence until the permitting authority issues authorization.”
    • Required — Installation, repair, or replacement of small wastewater systems, including septic tanks and leach fields, statewide under Wyoming's wastewater permitting framework.
      “A permit is required for the installation, repair or replacement of small wastewater systems, also known as septic tanks and leach fields.”
    • Required — Installation, repair, or replacement of small wastewater systems, also known as septic tanks and leach fields.
      “A permit is required for the installation, repair or replacement of small wastewater systems, also known as septic tanks and leach fields.”
  • Off-grid sanitationLimited

    Incinerating or composting toilets and other off-grid sanitation systems statewide in Wyoming.

    • DEQ states that permits may be required for incinerating or composting toilets.
    • The reviewed source does not specify the complete permit conditions or identify all local permitting variations.
    “Permits may also be required for hydrostatic test discharge water, wastewater reuse, and incinerating/composting toilets.”
    One more reviewed finding on this topic
    • Limited — Use of incinerating or composting toilets as off-grid sanitation in Wyoming.
      “Permits may also be required for hydrostatic test discharge water, wastewater reuse, and incinerating/composting toilets.”
  • Well permitRequired

    Construction of a groundwater well or development of a spring in Wyoming, including domestic and stock wells or springs flowing at most 25 gallons per minute.

    • An approved permit must be received before drilling or spring-development activities begin.
    • Springs flowing more than 25 gallons per minute, or springs used for purposes other than domestic or stock watering, must be permitted through the Surface Water Division.
    • Wells must be drilled by a Wyoming licensed water-well drilling contractor and pumps must be installed by a Wyoming licensed pump-installation contractor.
    • The U.W. 5 application must be complete and accurate and accompanied by the appropriate filing fee.
    • Domestic and stock applications are listed with a $50 filing fee.

    spring flow threshold: <= 25 gallons per minute (Higher-flow springs or non-domestic/non-stock use are handled through the Surface Water Division.) · domestic permit filing fee: 50 USD · stock permit filing fee: 50 USD

    “Wells and Springs - Before you drill a well, or develop a spring* (that flows less than or equal to 25 gallons per minute (gpm) and will be used f or D omestic and/or Stock W atering use only), you must submit an "Application for Permit to Appropriate Ground Water", or U.W. 5 Form, to the Ground Water Division and receive an approved permit prior to commencement of any drilling or spring development activities.”
    2 more reviewed findings on this topic
    • Required — Wells serving development in Platte County.
      “The State Engineer’s Office issues well permits.”
    • Required — A person seeking the right to beneficial use of underground water in Wyoming through a well or other means of obtaining underground water.
      “Any person who intends to acquire the right to beneficial use of any underground water in the state of Wyoming, shall, before commencing construction of any well or other means of obtaining underground water or performing any work in connection with construction or proposed appropriation of underground water or any manner utilizing the water for beneficial purposes, shall file with the State Engineer an application for a permit to make the appropriation (i.e., an Application for Permit to Appropriate Ground Water, or a U.W. 5 Form) and shall not proceed with any construction or work until a permit is granted by the State Engineer (W.S. 41-3-930).”
  • Agricultural exemptionConditional

    Certain divisions of land in unincorporated Wyoming made for agricultural purposes or affecting agricultural property-line alignment.

    • The exemption is subject to the article's anti-evasion rule.
    • The county board may adopt documentation requirements concerning proper use and implementation of the exemption.
    • The statutory provision covers a sale or other disposition of land for agricultural purposes or a division affecting the alignment of property lines for agricultural purposes.
    • Other applicable zoning, subdivision, wastewater, access, and utility requirements may still apply where not exempted.
    “A division which is a sale or other disposition of land for agricultural purposes or affects the alignment of property lines for agricultural purposes;”
    One more reviewed finding on this topic
    • Available (with conditions) — Certain land divisions, sales, dispositions, or property-line adjustments for agricultural purposes under Wyoming subdivision law, including unincorporated areas.
      “A division which is a sale or other disposition of land for agricultural purposes or affects the alignment of property lines for agricultural purposes;”
  • Short-term rentalsAllowed

    Short-term rental of detached one- and two-family dwellings and townhomes for purposes of Wyoming fire, building, and electrical standards.

    • The statute addresses classification under fire, building, and electrical standards and the International Building Code.
    • This claim does not resolve local zoning, licensing, lodging-tax, health, or other local requirements.
    “short term rental of detached one (1) and two (2) family dwellings and townhomes shall not be regulated as a commercial use”
  • county zoning authorityGeneral

    County regulation of the location and use of buildings and structures and the use, condition of use or occupancy of land in unincorporated areas of Wyoming.

    • The authority is exercised by each board of county commissioners for the unincorporated area of the county.
    • County zoning may not contravene the zoning authority of an incorporated city or town.
    • A zoning resolution or plan may not prevent a use or occupancy reasonably necessary for extraction or production of mineral resources.
    • A board may not require land use or physical development to be consistent with a local land use plan unless the applicable plan provisions have been incorporated into local zoning regulations.
    • Minimum lot size requirements or other zoning measures may not prevent residential or agricultural uses authorized for land divisions exempt from subdivision requirements under W.S. 18-5-303(a)(i).
    • Private schools meeting the statutory requirements may not be regulated differently from public schools: certification by the professional engineer or architect of record, capacity for fifty (50) students or more, and ownership and operation by a not-for-profit entity.
    “To promote the public health, safety, morals and general welfare of the county, each board of county commissioners may regulate and restrict the location and use of buildings and structures and the use, condition of use or occupancy of lands for residence, recreation, agriculture, industry, commerce, public use and other purposes in the unincorporated area of the county.”
  • county building authorityLimited

    County enforcement and interpretation of local or state fire, building, existing-building, and electrical safety standards, including residential construction in unincorporated areas, when the county obtains local enforcement authority under W.S. 35-9-121.

    • A county must apply for local enforcement authority and receive delegation from the state fire marshal by letter.
    • Before initial delegation, the state fire marshal must determine that the county has adopted minimum standards by ordinance or resolution equivalent to or more stringent than applicable department standards.
    • If the county fails to adopt new standards within six (6) months after department adoption, or fails to maintain standards at least meeting statewide standards, enforcement authority immediately reverts to the department.
    • For fire and building code enforcement, inspectors employed or contracted after July 1, 2010 must be certified by the International Code Council or the International Conference of Building Officials.
    • If electrical-code authority is requested, an electrical inspector must be certified by the International Code Council or International Association of Electrical Inspectors and licensed by Wyoming as a journeyman or master electrician.
    • If the county fails to maintain a required certified inspector, enforcement authority reverts to the department one hundred twenty (120) days after the inspector leaves.
    • A local governmental entity may assume sole plan-review authority and sole construction-inspection authority on approved plans, subject to the statutory certification requirements.
    • If local code provisions are more stringent than adopted state codes, the local code prevails.
    • The statute grants authority to enforce and interpret building standards; it does not establish that every Wyoming county universally requires a residential building permit without county-specific implementation.

    new standards adoption deadline: 6 months (following adoption of new standards by the department) · certification applicability date: July 1, 2010 (inspectors employed or contracted after this date) · authority reversion period after certified inspector leaves: 120 days

    “The state fire marshal shall delegate complete authority to municipalities and counties which apply to enforce and interpret local or state fire, building, existing building standards or electrical safety standards which meet the requirements of this section. The state fire marshal shall notify the governing body of the municipality or county of the minimum standards and requirements of this act and W.S. 16-6-501 and 16-6-502 and transfer jurisdiction and authority by letter.”

Still unanswered

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

  • Inspections — Building inspections for structures in Platte County, including possible municipal requirements.
  • Minimum dwelling size — Minimum dwelling size in unincorporated Platte County.
  • Lot coverage — Lot-coverage limits in unincorporated Platte County.
  • Camping on your land — Temporary camping on private land in unincorporated Platte County.
  • Tiny homes — Tiny-home occupancy in unincorporated Platte County.
2 more unanswered
  • Septic inspection
  • Mandatory utility hookup

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.

Water rights & wells in Platte County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from Wyoming’s water agency.

Managed area

Groundwater is actively managed here, but a small household well is generally still available.

Household wellPermit required (issued by right)

Unlike most exempt-well states, Wyoming requires a permit for every well including domestic and stock, but the permit for a small domestic/stock well is a simple, routinely granted filing and those uses carry a preferred right (W.S. 41-3-907).

Limit: All wells require a State Engineer's Office permit before drilling; small domestic/stock wells (≤25 gpm) are a routine registration and hold statutory preferred rights

Wyoming State Engineer's Office — Ground Water ↗

Prior-appropriation state (first in time, first in right). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the Wyoming state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Platte County, Wyoming

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

Platte County scores 47/100 on the Bolthole Index, a solid county profile. Its strengths: manageable long-term carry cost and sparse surroundings — about 5,690 people within a 30-minute drive. Watch-outs: weak self-sufficiency basics: only 14.4″ of rain a year, in severe drought 21.5% of years.

Do you need a building permit in Platte County, Wyoming?

Platte County requires a building permit only in limited cases (such as floodplains or specific zones), and it enforces county zoning. Onsite septic is permitted by Wyoming Department of Environmental Quality (DEQ), Water Quality Division - Small Wastewater Systems. 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.

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

Living in an RV on your own land in Platte County is limited to specific cases: Recreational-vehicle occupancy in county-regulated travel trailer park developments. The regulation addresses developments containing seasonal recreation-oriented campers, recreation vehicles, and truck campers. All travel trailer parks must comply with Platte County Subdivision Regulations. Confirm with the county before relying on it.

How much does land cost in Platte County, Wyoming?

Land in Platte County runs about $1,028 per acre, based on the latest county data.

What is the water situation in Platte County?

Platte County gets about 14.4" of rain a year, with severe drought in roughly 21.5% of years. On water rights, Platte County lies in the Platte County Control Area — Advisory-board control area near Wheatland; new wells subject to public notice, comment and possible denial if not in the public water interest..

How remote is Platte County?

A representative private-land location has about 5,690 people within a 30-minute drive and 576,647 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.

How Platte compares in Wyoming

Compare side-by-side →See all 23 Wyoming counties ranked →