Building permits, zoning and land rules in Montezuma County, Colorado

No, not for a home. Montezuma County has not adopted building codes for unincorporated areas, so it has no residential building permit requirement; state electrical and plumbing rules may still apply¹. That answers the "counties with no building codes" question: the county does not enforce residential building codes, and you may hire a qualified private inspector if you want one². The county does not issue certificates of occupancy either².

Several approvals still come first. Residential development requires approval of the septic system location and type, approval of the driveway access design and location, and a county address³. Commercial and industrial buildings are different: all new construction and remodeling must comply with the Uniform Building Code 1997 or later². The county's rules apply to unincorporated land; the Town of Dolores, for one, requires a building permit for any accessory structure larger than 120 square feet⁸. If your land sits in a platted subdivision, check the covenants too, since some set stricter design standards than the county does.

Montezuma County has no building department, so Montezuma County Planning & Zoning, at (970) 565-2801, is the office for zoning, addressing and driveway permits for unincorporated land, at 109 West Main Street, Room 270, in Cortez^2,9. For any new development, residential or commercial, the county directs applicants to its online permit center, and the same form helps with address, septic and driveway permits².

Septic permits are handled separately. Montezuma County Environmental Health, at (970) 564-4763, reviews septic applications and awards the permits from the Montezuma County Annex, 106 West North, in Cortez⁴. For a floodplain determination or elevation certificate, contact the county Floodplain Administrator at 565-7402; a floodplain development permit is required when the property is in FEMA-designated floodplain^2,10.

A driveway permit is required unless you access off a red-signed road that the county does not own or maintain². If your access is directly off a state highway, call CDOT at 970-385-3626².

Planning fees are published: the county's fee schedule lists $500 for a zoning application filed with new development, $1,000 for a new high impact permit and $50 for a floodplain certification review, though that schedule is dated 2017, so confirm current amounts with Planning & Zoning^6,9.

Yes. The Montezuma County Land Use Code applies to all land in unincorporated Montezuma County, and incorporated towns have their own rules³. Cortez, the Town of Mancos and the Town of Dolores each run their own zoning inside their limits: Cortez¹¹, Mancos¹² and Dolores¹³. Septic permits stay with the county health department except where a municipality maintains its own public health agency⁵.

In the unincorporated county, the code pairs landowner-initiated agricultural and residential zones with separate High Impact permitting for commercial and industrial uses³. Minimum lot size depends on the zone: A-80+ requires 80 acres, AGZ 20 acres, A/R 35+ 35 acres, A/R 10-34 10 acres, and A/R 3-9 and R-3 3 acres³. The 3-acre zones, A/R 3-9 and R-3, are not allowable within the Dolores River Valley³.

Countywide, the general threshold for a new home is 3 acres, net of green-signed county road rights-of-way, and 10 acres within the Dolores River Valley, where the lot must also include at least 30 percent developable land³. On A/R 35+ land, a Cluster Incentive Planned Unit Development can create lots smaller than 3 acres only to preserve agricultural land or open space, with at least 75 percent of the parcel kept in agriculture or common open space³. Subdividing property or changing its use must also comply with the Land Use Code³. Developments must provide adequate water, sewer and access³.

A dwelling must sit at least 30 feet from a county road right-of-way and 30 feet from lot lines, and within the Dolores River Valley new construction and septic systems must be 100 feet from the existing stream bank². The code lists building height maximums of 35 feet in some districts and 45 feet in the larger agricultural districts, and a footprint cap of 12 percent of the lot size in the cited sections³. The county also provides a zoning map through its GIS office; ask Planning & Zoning for your parcel's zone before designing, since district standards control^9,14.

Every onsite wastewater system of up to 2,000 gallons a day in Montezuma County needs a permit before it is installed, altered, expanded or repaired, and Environmental Health reviews the application and awards it^4,5. The application must be complete and include engineered plans, and road impact fees may apply⁵. A permit is not issued where a municipality or sewer district provides feasible public sewer service⁵. A permit expires 1 year after issuance if construction has not started, and a change in plans after issuance voids it unless the health department approves the change in writing⁵. County rules operate in addition to Colorado Regulation 43, and the county's local regulations took effect March 5, 2026⁵.

Colorado law also requires a final inspection before a septic system goes into use, and an occupancy permit for a home not on sewer cannot be finalized until that inspection is approved¹⁵. Soils are a real constraint: only 15.1% of Montezuma County's land has soil without severe limitations for a conventional septic drain field, so budget for a site evaluation and possibly an engineered system¹⁶. Private well permits could not be confirmed at the county level; Colorado requires a state well permit for every new well that diverts groundwater¹⁷.

We could not confirm a Montezuma County rule for living in an RV on private land. The county's RV rules cover RV and camper parks, a commercial use with lots of at least 1,000 square feet, not a single RV on your own parcel³. Ask Planning & Zoning before you park one for living⁹.

Colorado's Division of Housing approves factory-built tiny homes for long-term living statewide, but each unit must still meet local zoning where it is placed⁷. A certified manufactured home can go anywhere county zoning allows, once it meets Colorado's Wind Zone 1 and Thermal Zone 3 installation standards⁷. Whatever you live in, a home not on public sewer still needs the Environmental Health septic permit, and the structure needs its own county address^3,4.

1. Confirm your parcel's zone and minimum lot size under the Land Use Code, and check any subdivision covenants³.
2. Apply through the county's online permit center for your county address and, if needed, a driveway permit².
3. If the lot is not on sewer, apply for the septic permit through Environmental Health at (970) 564-4763, with engineered plans; the site evaluation can affect where you can build^4,5.
4. Design to the setbacks: at least 30 feet from a county road right-of-way and every lot line, and 100 feet from the stream bank in the Dolores River Valley².
5. If the property is in a mapped floodplain, submit proof of compliance with the floodplain resolution and get a floodplain development permit¹⁰.
6. Build. The county will not inspect residential construction or issue a certificate of occupancy, so hire a private inspector if you want one².

Ask Planning & Zoning which agricultural or residential zone covers the parcel, since the Land Use Code sets zones by parcel size and that determines what you can build and how far back it must sit^3,9. Only 15.1% of the county's soil has no severe limitation for a conventional septic drain field, so get a site evaluation before you assume a standard system will work¹⁶. If the parcel is in the Dolores River Valley, expect the larger lot minimum and the stream-bank setback^2,3.

This is dry, remote country: the county averages just 15.9 inches of precipitation a year and sees severe drought in 34.1% of years, and about 39.6% of the county is federal land, which can limit road access and expansion near some private parcels¹⁶. Farmland has sold for a typical $1,736 an acre, while the typical home value is about $420,181¹⁶. Property taxes are low: an effective rate near 0.3% and a median annual bill around $915¹⁶. The nearest city of 100,000 or more is about 177 miles away, so factor in longer supply runs and emergency-response times before you commit¹⁶.