Bolthole Index

Bolthole Index county-legal census · checked 2026-10-05

Colorado Counties With No Building Codes

3 of Colorado's 64 counties — 5% — do not require a residential building permit in their unincorporated areas. That is the 20th-largest count of any state. The strongest of them on the Bolthole Index is Montezuma County (65/100). 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 627 counties nationwide → Colorado: no zoning → Colorado: no codes, 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.4 Colorado’s State Buildings Program rules cover state projects rather than establishing a uniform building-permit process for private homes.17 The owner repair-or-maintenance exemption from county contractor licensing does not establish a statewide exemption for new-home construction.13 Use the owner-builder county list to find local exemptions, then confirm whether the exemption covers the proposed work.13

Read the full Colorado guide →

Sources

  1. Bolthole Index county rulebook, 64 Colorado counties, as of October 10, 2026: Colorado counties that require a residential building permit in unincorporated areas
  2. Bolthole Index county rulebook, 64 Colorado counties, as of October 10, 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 10, 2026: Colorado counties that do not require a residential building permit in unincorporated areas
  4. Colorado: Colorado Revised Statutes 2025 Title 30 Government - County, quoted and re-checked
  5. Colorado: Colorado Revised Statutes 2026, Title 30, § 30-11-125, quoted and re-checked
  6. Colorado: Land Use Planning and Regulation in Colorado, 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.

3 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.