Unincorporated Campbell County building permits

Requirements

• Inside a platted subdivision: Building Permit required; outside a platted subdivision: Building Permit is EXEMPT (Chapter 4 § 1.4.A.3), but electrical/mechanical/plumbing/septic permits are still required
• Completed Building Permit & Zoning Certificate Application
• Site plan drawn to scale showing setbacks, easements, septic tank/leach field, water/electric service lines, and (for new construction outside a subdivision) driveway mileage to access point
• Verification of potable water source: on-lot well permit (WY State Engineer's Office), Shared Well Agreement (signed, notarized, recorded) plus well permit, or Centralized Water System connection letter
• Approved Small Wastewater System (septic) permit if not on public sewer
• Zoning Certificate (no fee) approved prior to permit issuance for zoned parcels
• Inside a platted subdivision: two 24”x36” sets of building plans, plus foundation plans prepared by a Wyoming-licensed Professional Engineer with a soils report
• Valid Campbell County-issued address posted before any inspection will be performed
• Wyoming 811 (One Call) contacted prior to excavation

Required documents

• RequiredBuilding Permit & Zoning Certificate ApplicationCampbell County Dept. of Public Works application form covering building/site info, applicant info, zoning info, construction info, water source, and sewage disposal method
• RequiredSite PlanDrawn to scale or clearly dimensioned; shows north arrow, property lines, structures, wells, septic tank/leach field and future replacement field location, easements/rights-of-way, and utility lines
• OptionalFoundation Plans and Soils Report (platted subdivisions)Foundation plan stamped by a Wyoming-licensed Professional Engineer, with a soils report verifying footing/foundation type
• RequiredWater Well Permit or Shared Well AgreementCopy of the State Engineer's Office well permit for the intended use, or a signed/notarized/recorded Shared Well Agreement plus well permit

Fee schedule

Requirements

• Building Permit & Zoning Certificate Application, marked 'Update/Expansion of Existing Structure' or 'Interior Remodel Only'
• Site plan showing the existing structure(s), proposed addition footprint, and setbacks
• Foundation plans and soils report if new footings are part of the addition and the property is in a platted subdivision
• Electrical, mechanical, and plumbing permits as applicable for any trade work included in the remodel

Required documents

• RequiredBuilding Permit & Zoning Certificate ApplicationSelect 'Update/Expansion of Existing Structure' or 'Interior Remodel Only' as the Application Type
• RequiredSite PlanShows existing structures, proposed addition footprint, and setback dimensions

Fee schedule

Requirements

• Electrical Permit required for all new wiring, service changes, and alterations — required even when the associated Building Permit is exempt (e.g., rural/unplatted dwellings, farm/ranch structures, HUD manufactured homes, exempt accessory structures)
• Farm/Ranch Operation electrical work: contractor must still obtain an Electrical Permit per W.S. 35-9-123(b) even though the structure itself is exempt from Chapter 4
• Service disconnecting means must be installed at a readily accessible location within 50 feet, in plain view from outside the building (Chapter 4 § 10.A.1, amending NEC 230.70(A)(1))
• County Building Division inspectors perform all electrical inspections locally (Chapter 4 § 10.B.5(a))
• Mobile home electrical hookups follow the county's direct-bury/service-equipment standards (2-pole breaker sized to nameplate ampacity, grounding rods, conduit depth requirements)

Required documents

• RequiredBuilding Permit & Zoning Certificate ApplicationElectrical work is applied for through the same county application; select 'Electrical Re-Energize' or describe the electrical scope under Type of Work

Fee schedule

Requirements

• Plumbing Permit required for new fixtures, water/sewer line work, and re-piping — required even where the associated Building Permit is exempt
• Mobile home water/sewer hookups: minimum 3-inch schedule 40 drainage pipe and fittings, proper slope (1/4 in. per foot), water line protected from freezing and insulated
• Sewer connections to Small Wastewater Systems must comply with Chapter 4 Appendix 1 (DEQ Water Quality Rules Chapter 25) frost/depth requirements

Required documents

• RequiredBuilding Permit & Zoning Certificate ApplicationPlumbing work is applied for through the same county application

Fee schedule

Requirements

• Mechanical Permit required for furnace/AC/heat pump installation, ductwork, and gas piping — required even where the associated Building Permit is exempt
• Gas systems with a design flow requiring DEQ oversight (non-domestic wastewater or specific commercial cases) may require separate DEQ permitting

Required documents

• RequiredBuilding Permit & Zoning Certificate ApplicationMechanical work is applied for through the same county application

Fee schedule

Requirements

• Reroofing of a dwelling located inside a platted subdivision requires a Building Permit under the general Chapter 4 framework; a rural (unplatted) dwelling's reroof falls under the same rural-dwelling Building Permit exemption (Chapter 4 § 1.4.A.3) as new construction
• Roof design must meet Chapter 4 Section 1.6 snow load criteria: 35 psf (roofs ≤1:12 pitch) or 30 psf (roofs >1:12 pitch), no reductions, plus required ice barrier underlayment

Required documents

• RequiredBuilding Permit & Zoning Certificate ApplicationReroofing is applied for through the same county application when a permit is required

Fee schedule

Requirements

• Structural/racking attachment to a residential roof is reviewed under the Building Permit (2024 IRC) framework where a Building Permit applies (platted subdivision) — Chapter 4 § 1.4.A.3's rural-dwelling exemption logic extends to the structural aspect for rural dwellings, but the interconnection work still requires an Electrical Permit
• Electrical interconnection, wiring, and disconnects require an Electrical Permit under NFPA 70 (NEC) 2026 Edition, Chapter 4 Section 10
• Structural design must comply with Chapter 4 Section 1.6 snow load (35/30 psf) and wind speed (100–120 mph by risk category) criteria for the roof-mounted array

Required documents

• RequiredBuilding Permit & Zoning Certificate ApplicationUsed for the structural/racking component where a Building Permit applies

Fee schedule

Requirements

• Electrical Permit required for the EV charger's dedicated circuit/service work — required even where the associated Building Permit is exempt (e.g., rural/unplatted dwellings)
• Service disconnecting means must be installed at a readily accessible location within 50 feet, in plain view from outside the building (Chapter 4 § 10.A.1, amending NEC 230.70(A)(1)) if the install involves new/upgraded service equipment
• Installation must comply with NFPA 70 (National Electrical Code), 2026 Edition, per Chapter 4 Section 10
• County Building Division inspectors perform the electrical inspection locally (Chapter 4 § 10.B.5(a))

Required documents

• RequiredBuilding Permit & Zoning Certificate ApplicationEV charger electrical work is applied for through the same county application; describe the scope (new circuit/EVSE) under Type of Work

Fee schedule

Requirements

• Applies only in R-L, R-R, R-S, R-1, and A-L Zoning Districts (Chapter 7 § 45.70(2))
• One ADU permitted per lot in R-L/R-R/R-S/R-1; one ADU per Primary Dwelling Unit in A-L (multiple allowed in A-L only if each Primary Dwelling meets the 10-acre minimum land area under § 15.10(1))
• Written verification required that the Homeowners' Association, Improvement & Service District, or recorded Covenants Agreement approves the specific ADU; if none of these entities exist for the subdivision, a Conditional Use Permit (§10.55, $200 fee) is required instead
• Maximum Building Footprint Living Area: the SMALLER of 60% of the Primary Dwelling Unit's footprint, or 1,100 sq. ft.
• Maximum height: cannot exceed the height of the Primary Dwelling Unit
• Detached ADUs may not be located in the front or side yard areas of the Principal Dwelling (except existing buildings under §45.70(6)(e))
• HUD Manufactured Homes, RVs, and boats are PROHIBITED as ADUs, except Park Model Homes are allowed in A-L/R-L/R-R districts where the Primary Dwelling is itself a manufactured home
• Attached ADUs must comply with the Two-Family Dwelling provisions of the currently adopted IRC, including Appendix AK sound transmission requirements
• Detached ADUs (new construction) must comply with the currently adopted IRC; attached garages to the ADU may not exceed the ADU's own allowable footprint
• Existing detached accessory structures converted to an ADU are not limited by a shop/garage-to-ADU area ratio, but the ADU living area itself cannot exceed the § 45.70(6)(a) size cap
• Septic/sewer: ADU's small wastewater system may interconnect with the Primary Dwelling's system (not prohibited) but must comply with Chapter 4 Building Regulations

Required documents

• RequiredZoning Certificate Application (for the ADU land use)Land Use Permit application under Chapter 7 Zoning Regulations, Review Process 1
• RequiredHOA / Improvement & Service District / Covenants Approval LetterWritten approval of the specific ADU from the applicable entity, or a copy of the recorded Covenants Agreement
• RequiredBuilding Permit & Zoning Certificate ApplicationRequired for the construction itself (attached or new-construction detached ADU) under the 2024 IRC

Fee schedule

Requirements

• Demolition, removal, or Change of Occupancy Classification of a building or structure requires application to the Building Division per Chapter 4 Section 1.3.A
• Utility disconnects should be verified/arranged prior to demolition

Required documents

• RequiredBuilding Permit & Zoning Certificate ApplicationDemolition is applied for through the same county application

Fee schedule

Requirements

• $250 flat fee applies to all new construction requiring a Commercial Building Permit (Chapter 4 § 1.8.A)
• Three complete sets of plans signed and sealed by a Wyoming-licensed Professional Engineer or Architect required (Commercial Building Permit Checklist)
• Complete plan set: geotechnical report, civil plans, cover sheet with code data analysis, architectural plans, structural plans, gas plans, plumbing plans, mechanical plans, electrical plans, fire protection plans
• Code data analysis on the title sheet must show use group classification, construction type, fire-resistant construction, design approach, height/area calcs, fire protection systems, interior finish, occupant load, means of egress, and accessibility features
• Electrical plans for new commercial buildings/additions must be signed/sealed by a Wyoming-licensed Professional Electrical Engineer (or a Master Electrician employed by the licensed Electrical Contractor for services 400A or less, signed with WY state license number)
• Plumbing and Mechanical plans must be signed/sealed by a Wyoming-licensed Professional Mechanical Engineer and show compliance with the 2024 IPC/IMC
• Certified (stamped) site plans required for all multi-family, commercial, and industrial construction unless waived by the Applicable Director
• Applications/permits expire 180 days after submittal (no extension request) or 180 days after issuance if work has stopped or not begun, unless a written extension is granted by the Building Official

Required documents

• RequiredCommercial Building Permit ChecklistCounty's guide to the commercial permitting process, required plan set contents, timelines, and fees
• RequiredCommercial Site Plan ChecklistDetailed site plan content requirements (parking, utilities, drainage, setbacks, landscaping, lot coverage)
• RequiredElectrical Plan Submittal Requirements for Commercial BuildingsCounty's electrical plan submittal checklist for commercial projects
• RequiredPlumbing & Mechanical Plan Submittal Requirements for Commercial BuildingsCounty's plumbing/mechanical plan submittal checklist for commercial projects

Fee schedule

Requirements

• EXEMPT from a Building Permit (Zoning permit still required in most instances) if ALL of: not serving the main/front exit door; 200 sq. ft. or less; not more than 30 inches above grade within 36 inches of the deck; not attached to the dwelling
• Attached or larger decks require a full Building/Zoning permit
• Footers: minimum 42 inches depth from finish grade to bottom of footing (per the county's guideline, consistent with Chapter 4's 42-inch building frost line depth), 8 inches thick, extending 2 inches beyond post sides
• Posts: 4x4 (or equivalent) up to 8 ft. height; 5x6 required above 8 ft.; all posts pressure-treated or decay-resistant (redwood/cedar)
• Guardrails required for decks more than 30 inches above grade; height 34–38 inches; openings must not allow passage of a 6-inch sphere
• Stairways: minimum 3 ft. clear width, riser 4–7.75 inches, tread depth min. 10 inches nose-to-nose, minimum 3 stringers for a standard 3 ft. wide stairway

Required documents

• OptionalBuilding Permit & Zoning Certificate ApplicationRequired for decks that do not qualify for the small-deck exemption
• OptionalResidential Deck GuidelinesCounty's technical guide to deck footings, posts, beams, ledger boards, stairways, and guardrails (references the 2018 IRC — verify against current 2024 IRC deck provisions for any conflicting detail)

Fee schedule