Bolthole Index

Bolthole Index county-legal census · checked 2026-10-03

Colorado Counties With No Building Codes and No Zoning

1 of Colorado's 64 counties — 2% — require no residential building permit and have no county-wide zoning in their unincorporated areas. That is the 22nd-largest count of any state. The strongest of them on the Bolthole Index is Baca County (43/100). Every entry below cites the county’s own official source.

Rules change, and cities inside these counties set their own — treat this as a verified starting point, not legal advice. All 517 counties nationwide → Colorado: no building codes → Colorado: no zoning → Colorado: owner-builder → Colorado: tiny homes → Colorado: no minimum home size → Full Colorado profile →

From the Colorado guide

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

Read the full Colorado guide →

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 with county zoning
  8. Bolthole Index county rulebook, 64 Colorado counties, as of October 15, 2026: Colorado counties with neither a residential building permit nor county-wide zoning
  9. Colorado: Colorado Revised Statutes 2026, Title 30, § 30-11-125, quoted and re-checked
  10. Colorado: Colorado Revised Statutes 2025 Title 30 Government - County, quoted and re-checked
  11. Colorado: Land Use Planning and Regulation in Colorado, quoted and re-checked
  12. Colorado: Approved State Building Codes, quoted and re-checked
  13. Colorado: Building Code Compliance Policy, quoted and re-checked
  14. Colorado: Colorado Revised Statutes 2025 Title 30 Government - County, quoted and re-checked
  15. Colorado: Land Use Planning and Regulation in Colorado, quoted and re-checked
  16. Colorado: SB24-179 Floodplain Management Program, quoted and re-checked
  17. Colorado: Colorado Revised Statutes 2024, Title 31 — Government - Municipal, quoted and re-checked
  18. Colorado: Short-term Rental Regulation, quoted and re-checked

From the Colorado guide, written from the cited official sources and re-checked by an independent reviewer. This is research, not legal advice: confirm with the office before you buy or build.

1 of 64 Colorado counties · sorted by Index score

Keep exploring

Every county here has a full profile — water, land prices, hazard safety, seclusion, and the rest of its building rules. See the Colorado state page for all 64 counties ranked, or go back to the national list.

Off-grid gear

Building on land in one of these Colorado counties? The kit we'd start with:

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General guidance, not legal advice. Off-grid, building, and land-use rules are often set at the county level and change often. Verify with your county and state before acting. Data reviewed 2026-06-26.