Building permits, zoning and rural land rules across Colorado

At a glance

Residential building permits

57 counties required; 4 limited; 3 not required¹²³

Countywide zoning

61 counties have zoning; 3 have no countywide zoning⁸⁵

No building permit and no zoning

Baca County is the only county listed in both categories⁹

Septic permits

51 counties use county offices; 13 use health districts; final inspection required before use¹⁰¹¹

RV living

24 county answers: 9 temporary-only, 13 limited, 2 prohibited; 40 unanswered⁷

Tiny homes

23 county answers: 5 allowed with applicable conditions, 18 limited; 41 unanswered; state-approved tiny homes still need local zoning¹²¹³

Owner-builder

County contractor-license exemption covers owner repair or maintenance; electrical and plumbing exemptions have separate conditions¹⁴¹⁵¹⁶

Wells

DWR issues well permits; basin-specific rules and augmentation requirements can affect approval¹⁷

Manufactured homes

Allowed only where local zoning allows; Division of Housing regulates installation¹⁸

Who to call

Contact details are copied from each office’s official page and were checked against it on October 15, 2026.

Which Colorado counties don't require a building permit?

Montezuma County, Dolores County and Baca County are the 3 Colorado counties listed without a residential building-permit requirement.³ Another 4 counties have limited requirements: Delta County, Yuma County, Kit Carson County and Prowers County; keep these separate from the no-building-permit category.² The remaining 57 counties require residential building permits.¹ Use the Colorado no-building-codes list as a starting point, then open the county guide for the permit scope.³

Colorado county building-code authority applies to designated unincorporated areas, and local governments drive most building-code decisions.¹⁹ Colorado is a local-control state: the State Buildings Program code and inspection rules cover state-owned facilities, not a uniform building-code adoption or permit process for private homes.^2021224 The owner repair-or-maintenance exemption from county contractor licensing does not establish a statewide exemption for new-home construction.¹⁴ Use the owner-builder county list to find local exemptions, then confirm whether the exemption covers the proposed work.¹⁴

Which Colorado counties have no zoning?

Gunnison County, Saguache County and Baca County are the 3 counties listed without countywide zoning; 61 Colorado counties have zoning.⁵⁸ Baca County is the only county listed with both no residential building-permit requirement and no countywide zoning.⁹ Compare the no-zoning list with the no-building-codes-and-no-zoning list.⁵⁹

Colorado county zoning authority concerns unincorporated territory and can regulate building size, lot coverage, lot size and land uses.²³ The state sets no single minimum lot size, so minimum lot sizes must be obtained from the applicable county zoning resolution and district map.²⁴ A lack of countywide zoning does not remove Colorado’s septic permitting requirements or applicable floodplain development standards.⁶²⁵ For a small dwelling, start with the no-minimum-home-size list and ask the county planning office for the parcel’s applicable building-size rules.²³

Building-height limits and short-term-rental rules are also local. Municipal zoning sets height by district, with no statewide numeric limit.²⁶ Colorado has no statewide short-term-rental scheme: county commissioners may license and regulate rentals of fewer than 30 days, and home-rule cities and HOA covenants can add limits.²⁷

Who issues septic permits in Colorado?

Colorado septic permits come from local public health agencies under local board-of-health rules; the state establishes minimum standards.²⁸ Across Colorado, 51 counties use county offices and 13 are served by multi-county health districts.¹⁰ CDPHE’s On-site Wastewater Treatment program explains the state standards, while local counties conduct permitting for systems with flows of 2,000 gallons per day or less.²⁹

Colorado requires an OWTS permit before construction, alteration, installation or use of an on-site wastewater treatment system.⁶ For a structure without sewage-treatment service, local health approval of the OWTS permit comes before building construction or remodeling approval; final inspection and approval come before occupancy approval.³⁰ That sequence makes septic approval an early land-buying question even in a county without residential building permits.³⁰³ Local public health agencies must also complete a final inspection after the work and before the system is used, and an occupancy permit for a building without sewer service requires that inspection and approval.¹¹ Off-grid dwellings still need adequate sanitary sewage disposal, and Colorado prohibits new cesspools.³¹

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

Colorado has county-specific RV answers for 24 counties: 9 allow temporary occupancy only, 13 have limited allowances and 2 prohibit occupancy; the other 40 counties remain unanswered.⁷ Temporary-only examples include Teller County, Garfield County and Montrose County.⁷ An unanswered county is neither permission nor a prohibition; ask the parcel’s county planning office about residential RV occupancy before buying.⁷

Colorado has tiny-home answers for 23 counties: 5 allowed with applicable conditions and 18 limited, with 41 counties unanswered.¹² The allowed category includes Routt County, Gunnison County, El Paso County, Larimer County and Boulder County; use the tiny-home county list to compare the conditions.¹² Colorado Division of Housing-regulated residential tiny homes are approved for long-term living, subject to approved plans, applicable standards and local zoning.¹³ DOH certifies tiny-home units for their specific installation site, so ask DOH about a proposed relocation before moving a unit.³² HUD-code manufactured homes can be installed anywhere in Colorado only where local zoning allows it; the Division of Housing regulates installation and installation inspections, while local building departments regulate mobile-home foundations.¹⁸

A second dwelling is a separate question. Colorado requires one accessory dwelling unit, approved administratively, beside a single-unit detached house in larger municipalities and in county areas inside census-designated places of at least 40,000 people within a metropolitan planning organization.³³ That rule does not cover every town or rural county, so ask the parcel’s planning office.³³

Where are the best Colorado counties for a bolthole?

Costilla County and Routt County lead the Bolthole Index at 69, followed by Archuleta County and Delta County at 68.³⁴ All have zoning and county septic authority; Costilla, Routt and Archuleta require residential building permits, while Delta has limited building-permit requirements.³⁴ Montezuma County scores 65 and combines no residential building-permit requirement with zoning and county septic authority.³⁴ Fremont County, Huerfano County and La Plata County score 64, require building permits and have zoning; Huerfano uses district septic authority, while Fremont and La Plata use county authority.³⁴

Colorado’s median county farmland value is $2,849 per acre, a farmland measure rather than an asking price for a buildable parcel.³⁵ The median county effective property-tax rate is 0.4%, and the median county property-tax bill is $1,293 annually.³⁶

What should you check about Colorado water, wells and access?

Colorado follows prior appropriation for water rights, and 22 counties lie within a special groundwater management regime.³⁷ A new residential well generally needs a Colorado Division of Water Resources permit, subject to statutory exemptions and basin-specific rules; an augmentation plan may also be necessary where priority is insufficient.¹⁷ DWR says complete new and replacement well applications may take up to 49 days to review.¹⁷ Give DWR the existing well-permit number or the property’s legal description when asking about a well permit.³⁸

Colorado’s subdivision exclusion for parcels of at least 35 acres requires that none be intended for use by multiple owners; local county subdivision administration still matters.³⁹ That subdivision exclusion does not itself answer whether a proposed well can be approved.³⁹¹⁷ Direct residential access to a state highway needs a CDOT access permit, with a $50 fee for single-family residential or agricultural access; required roadway improvements are the permittee’s responsibility.⁴⁰

Watch-outs

• Colorado county building-permit and zoning counts concern unincorporated land; city limits change the responsible building and zoning authority.¹⁹²³
• Colorado counties can adopt or update building codes, so confirm the current residential building-permit requirement with the county building office before construction.¹⁹
• Short-term rentals of fewer than 30 days have no statewide rule, so confirm county licensing and any HOA covenant before buying land for a rental.²⁷
• No residential building-permit requirement does not remove Colorado septic requirements or applicable floodplain development standards.⁶²⁵
• We could not confirm a statewide minimum dwelling size or general occupancy-certificate rule; ask the local planning office about minimum floor area and the building office about occupancy approval.⁴
• Colorado’s state-park camping rule applies to Parks and Wildlife land; it does not establish residential RV permission on private land.⁴¹

Sources

1. Bolthole Index county rulebook, 64 Colorado counties, as of October 15, 2026: Colorado counties that require a residential building permit in unincorporated areas
2. Bolthole Index county rulebook, 64 Colorado counties, as of October 15, 2026: Colorado counties that require a residential building permit only in some cases (for example floodplain or certain structures)
3. Bolthole Index county rulebook, 64 Colorado counties, as of October 15, 2026: Colorado counties that do not require a residential building permit in unincorporated areas
4. Colorado: Land Use Planning and Regulation in Colorado, quoted and re-checked
5. Bolthole Index county rulebook, 64 Colorado counties, as of October 15, 2026: Colorado counties with no county-wide zoning
6. Colorado: Title 25 - Public Health and Environment - Colorado Revised Statutes 2024, quoted and re-checked
7. Bolthole Index county rulebook, 64 Colorado counties, as of October 15, 2026: Colorado counties' answers on living in an RV on your own land
8. Bolthole Index county rulebook, 64 Colorado counties, as of October 15, 2026: Colorado counties with county zoning
9. Bolthole Index county rulebook, 64 Colorado counties, as of October 15, 2026: Colorado counties with neither a residential building permit nor county-wide zoning
10. Bolthole Index county rulebook, 64 Colorado counties, as of October 15, 2026: Who issues septic permits across Colorado's counties: a state agency, a multi-county health district, or the county
11. Colorado: Title 25 - Public Health and Environment - Colorado Revised Statutes 2024, quoted and re-checked
12. Bolthole Index county rulebook, 64 Colorado counties, as of October 15, 2026: Colorado counties' answers on living in a tiny home on your own land
13. Colorado: Consumers of Manufactured Homes and Tiny Homes - HUD, quoted and re-checked
14. Colorado: Colorado Revised Statutes 2026, Title 30, § 30-11-125, quoted and re-checked
15. Colorado: Colorado Revised Statutes 2026, Title 12, § 12-115-116, quoted and re-checked
16. Colorado: Colorado Revised Statutes 2026, Title 12, § 12-155-118, quoted and re-checked
17. Colorado: Water Administration, quoted and re-checked
18. Colorado: Consumers of Manufactured Homes and Tiny Homes - HUD, quoted and re-checked
19. Colorado: Colorado Revised Statutes 2025 Title 30 Government - County, quoted and re-checked
20. Colorado: Land Use Planning and Regulation in Colorado, quoted and re-checked
21. Colorado: Approved State Building Codes, quoted and re-checked
22. Colorado: Building Code Compliance Policy, quoted and re-checked
23. Colorado: Colorado Revised Statutes 2025 Title 30 Government - County, quoted and re-checked
24. Colorado: Land Use Planning and Regulation in Colorado, quoted and re-checked
25. Colorado: SB24-179 Floodplain Management Program, quoted and re-checked
26. Colorado: Colorado Revised Statutes 2024, Title 31 — Government - Municipal, quoted and re-checked
27. Colorado: Short-term Rental Regulation, quoted and re-checked
28. Colorado: Title 25 - Public Health and Environment - Colorado Revised Statutes 2024, quoted and re-checked
29. Colorado Department of Public Health and Environment — On-site Wastewater Treatment (cdphe.colorado.gov)
30. Colorado: Title 25 - Public Health and Environment - Colorado Revised Statutes 2024, quoted and re-checked
31. Colorado: content.leg.colorado.gov, quoted and re-checked
32. Colorado Division of Housing — Factory Built Structures (doh.colorado.gov)
33. Colorado: HB24-1152 Accessory Dwelling Units, quoted and re-checked
34. Bolthole Index county rulebook, 64 Colorado counties, as of October 15, 2026: The 8 highest-scoring Colorado counties on the Bolthole Index (off-grid and homestead land score out of 100), with each one's building-permit, zoning and septic answers
35. Bolthole Index county rulebook, 64 Colorado counties, as of October 15, 2026: Median farmland value per acre across Colorado's counties (USDA census, the middle county's value; USD/acre), with the five least expensive counties
36. Bolthole Index county rulebook, 64 Colorado counties, as of October 15, 2026: Median of Colorado's county effective property tax rates and median county property tax bills
37. Colorado water rights and groundwater management: National Agricultural Law Center and Bolthole Index groundwater review
38. Colorado Division of Water Resources (dwr.colorado.gov)
39. Colorado: Colorado Revised Statutes 2024, Title 30—Government—County, quoted and re-checked
40. Colorado: Access Permits | Frequently Asked Questions, quoted and re-checked
41. Colorado: Title 33 - Parks and Wildlife - Colorado Revised Statutes 2024, quoted and re-checked

Written October 15, 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.