Building permits, zoning and septic rules in Mineral County, Colorado

Unincorporated Mineral County requires its land-use/build consent before construction, and applications and designs must be submitted at least 30 days before work is planned to begin^1,2. The unusual part is the code distinction: Mineral County says it has not adopted any International Building Codes². Colorado's owner-builder exception is narrow: where a county has adopted a contractor-licensing program, an owner does not need that contractor license to perform repair or maintenance on the owner's property; the exception does not waive building permits, land-use consent, zoning, electrical, plumbing or septic requirements¹¹. Owners may perform electrical work on their own property if non-maintenance work is inspected, and may perform plumbing work on their own property, subject to the statutes' limits for resale, rental and commercial property¹². For a building or remodel without sewage-treatment service, the local public health agency must issue the OWTS permit before the building permit can be issued³.

For unincorporated Mineral County, contact the Mineral County Land Use Office about land-use/build consent and OWTS applications^1,7. The office is at 1201 N. Main Street, PO Box 70, Creede, Colorado 81130; call (719) 658-2360 or email deputyadmin@mincocolo.com². Inside Creede, the town handles its own building permits; OWTS permits remain with the Mineral County Land Use Office^5,7. Ask the Land Use Office to identify the unincorporated parcel's zoning district before paying for final plans^2,4.

Mineral County administers zoning in regulated unincorporated areas through 10 districts; the use chart marks a use as permitted or conditional, and a blank box means the use is prohibited in that district⁴. Inside Creede, the town administers its own zoning; OWTS permits remain with the Mineral County Land Use Office^6,7. Federal land is outside that county zoning jurisdiction⁴. Colorado also requires counties to regulate subdivisions in unincorporated areas, although a division creating parcels of at least 35 acres each can fall outside the statutory definition when none is intended for multiple-owner use¹³. In the Mobile Home district, manufactured and mobile homes are allowed on individually owned lots, while manufactured or mobile-home parks are conditional uses⁴. That district's accessory-dwelling provision expressly covers short-term rental occupancy, limited to one short-term-rental unit per property; it does not confirm unrestricted long-term ADU occupancy⁴. Parcel-specific minimum lot size, setbacks, lot coverage, building height and minimum dwelling size could not be confirmed, so ask the Land Use Office for the zoning designation and dimensional table before designing or placing a structure².

Colorado Regulation 43 governs OWTS in Mineral County, while the program's permitting and local administration run through the Mineral County Land Use Office⁸. The office says every Mineral County OWTS must be designed by a Colorado-licensed professional engineer based on the property's soil content⁷. For a project without sewage-treatment service, obtain the OWTS permit before the building permit can be issued³. Permitted OWTS work needs a final inspection before use, and a building without sewage-treatment service cannot receive occupancy approval until the local public health agency inspects and approves the installation^3,14. Only 1.4% of Mineral County soils are rated without severe limitations for a conventional drain field, so make the site evaluation and engineered design an early feasibility test¹⁵. New cesspools are prohibited, and off-grid dwellings still need adequate sanitary sewage disposal¹⁴.

Mineral County's rule for residential RV occupancy or temporary camping on private land could not be confirmed, so ask the Land Use Office about the parcel's district, duration limits, utilities and occupancy during construction before moving an RV onto the property^2,9. A Colorado Division of Housing-regulated tiny home can be approved for long-term living on a permanent or temporary foundation, but it must meet applicable codes and Mineral County zoning and is certified for its approved site¹⁶. A manufactured or mobile home has a specific county pathway in the Mobile Home district, where it is allowed on an individually owned lot; a manufactured or mobile-home park is a conditional use⁴. None of these housing types avoids sewage requirements¹⁴.

1. Ask the Land Use Office to confirm the parcel's zoning district and allowed use; if the parcel is being divided, also confirm whether county subdivision review applies^2,4,13.

1. Verify recorded legal access and identify the road authority. A new approach to a Mineral County road needs county permission and site approval; the permit itself does not establish legal access¹⁰. Direct access to a Colorado state highway requires a CDOT access permit¹⁷.

1. For county-road access, submit the required site and design information, mark the proposed approach with two flagged lathes, and budget the $75 application fee¹⁰. The standard is an 18-inch corrugated-metal culvert unless the county determines otherwise¹⁰.

1. Every new well diverting groundwater in Mineral County needs a Colorado Division of Water Resources well permit¹⁸. A well that does not qualify for a statutory exemption and lacks sufficient priority to divert may be able to operate under a water-court-decreed augmentation plan; confirm the proposed water supply with DWR before committing to construction¹⁸.

1. Hire a Colorado-licensed professional engineer to design the OWTS for the property's soils and obtain the OWTS permit before the building permit if the site lacks sewer service^3,7.

1. Submit the county application and designs at least 30 days before planned construction^1,2.

1. Complete the required OWTS final inspection and approval before occupancy if the building lacks sewage-treatment service³.

Only 20.5% of Mineral County land is at a slope of 15% or less, and only 1.4% of its soils are rated without severe limitations for a conventional septic drain field¹⁵. Confirm a usable building envelope, engineered OWTS feasibility and any floodplain constraint before closing^7,19. Verify recorded legal access separately from physical access: Mineral County's road-approach permit does not create a legal right to reach the county road¹⁰. If acreage was recently split, confirm that the division complied with county subdivision rules; Colorado's 35-acre statutory exclusion has conditions and is not a general exemption for every large tract¹³. Every new well diverting groundwater in Mineral County requires a DWR well permit; statutory exemptions and water-rights priority determine whether an augmentation plan may be needed¹⁸. Federal land covers 93.8% of the county, making access across adjoining land especially important to document¹⁵. Mineral County has 1.1 people per square mile, and the nearest city of 100,000 or more is about 131 miles from the county center, so plan realistically for contractors and deliveries¹⁵.