Yes, they still exist — and you don't have to take an algorithm's word for it. Colorado's Division of Housing publishes, in writing, a list of 15 counties with no building department and no residential code. Several whole states run versions of the same freedom. Below is the sourced version: what's real, where it is, and the catches that come with it. Every claim on this page traces to an official document; the full county-by-county receipts live on the Freedom Map (458 counties verified and growing).
Colorado is the honest starting point because the state itself keeps the list. Per the Colorado Division of Housing, these 15 counties have no building department and no residential building code on unincorporated land:
Baca · Cheyenne · Costilla · Custer · Delta · Dolores · Kit Carson · Mineral · Montezuma · Phillips · Prowers · Saguache · Sedgwick · Washington · Yuma
Source: Colorado Division of Housing, published list of counties without adopted building codes. Being on this list does not mean problem-free — Costilla County, for example, actively enforces land-use and camping rules. Each county's full card on the map carries the receipts and the caveats.
Missouri has no statewide residential building code at all — adoption is a local choice, and large rural stretches never adopted one. Tennessee writes the opt-out directly into state law, and dozens of counties have exercised it. Texas is the quiet one: the residential code nominally applies, but in unincorporated areas no county may operate a building permit office — the builder arranges three inspections privately, and no county inspector ever drives out.
Sources: Missouri Revised Statutes (local-option code adoption); Tennessee Code (county opt-out provisions); Texas Local Government Code (county authority limits). Statute citations on the relevant county cards.
Even in fully-coded counties, the code exempts itself in places. IRC R105.2 allows one-story detached accessory structures up to 200 square feet (120 in some states) with no permit — plus fences, low decks, retaining walls, and driveways. And several states — Pennsylvania, Ohio, Michigan, Oregon, Florida among them — exempt genuine agricultural buildings from the building code entirely, with no size cap, wherever the land is in real agricultural use.
Sources: International Residential Code §R105.2; state agricultural-exemption statutes (each cited on the relevant card). Note: the ag exemption dies — retroactively — the moment a building contains habitable space; Pennsylvania wrote that into the definition itself.
This is where people get hurt, so it gets equal airtime. In every "free" county: septic still applies — wastewater is health-department turf everywhere, and the perc test is the real gatekeeper of rural land. Wells and water rights run through the state (in Colorado, a sub-35-acre exempt well is household-use only). State electrical inspections still run in Colorado regardless of county code status. Floodplain rules follow any federally connected financing. "Never inspected" shrinks your resale market and your lender list. And zoning setbacks can apply even to your permit-exempt shed. Freedom exists, it's real, and it's narrower than the thumbnail promised.
The short version of our method: pull the county's actual documents (not a summary), call the health department about perc rates and setbacks, confirm the well permit class with the state water authority, get the utility's line-extension tariff in writing, and put a perc contingency in the offer. The long version — with each county's receipts, grades across ten dimensions, and what we couldn't verify — is the Freedom Map: grades free to browse, full sourced cards for members, honest grey where we haven't verified yet.
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Last updated 2026-07-10 · Not legal advice — regulations change and vary parcel by parcel; confirm current rules with the county, the state, and a professional before buying or building. Scores describe unincorporated county land; incorporated towns set their own, usually stricter, rules.