A completed barndominium viewed from a low angle showing its standing seam metal roof and vertical wall panels, with the last patches of snow melting beside it.

Are Barndominiums Legal in Colorado? Codes, Permits & Wells

Barndominiums are legal in Colorado. No state law singles them out, and a steel or post-frame house with living quarters is regulated as a house. The harder question is who regulates it, because Colorado has no statewide residential building code. Counties may adopt a building code for their unincorporated land, and cities and towns regulate their own, so the rules change at every boundary. On top of that local layer sit a few things that reach almost every parcel: county zoning, a septic permit from the local public health agency, a well permit from the state Division of Water Resources, state electrical and plumbing inspection where no local programme exists, and — in mapped wildland-urban interface areas — a wildfire code that state law requires local governments to adopt. This guide sets out each layer, cites the statute or agency behind it, and ends with the questions that settle it for a specific parcel. It is general information, not legal advice; the building and planning departments for your land have the final word.

Figures on this page are cited third-party or government data, not a quote from Colorado Barndominium Builders.

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Bottom Line Up Front

  • Yes, barndominiums are legal in Colorado. The question is who regulates your parcel: Colorado has no statewide residential building code, and under C.R.S. 30-28-201 counties may adopt one for unincorporated land while cities and towns regulate their own.
  • Some rules reach almost every parcel regardless: county zoning, the septic permit from the local public health agency, the Division of Water Resources well permit — where a lot under thirty-five acres is generally limited to in-house use — and state electrical and plumbing inspection where no local programme exists.
  • Two state mandates bind local governments rather than homes directly: the energy code (HB22-1362) for governments that have a building code, and the Colorado Wildfire Resiliency Code for those with land in the mapped wildland-urban interface.

Zoning: can a house go on this parcel at all?

Zoning is separate from the building code, and most counties have it even where they have no building code.

County zoning covers the unincorporated area

Under C.R.S. 30-28-111, a county zoning plan can regulate the location, height, bulk and size of buildings, lot coverage and lot size, and the use of buildings for residence, trade, industry and other purposes across all or part of the unincorporated county. Inside a city or town, municipal zoning applies instead. Ask whether a dwelling is a permitted use in the district, and whether the shop portion's size, height or use needs separate approval.

The thirty-five acre exemption is about subdivision, not zoning

C.R.S. 30-28-101(10)(b) says a division of land into parcels of thirty-five acres or more, none intended for multiple owners, is not a subdivision. That is why so many rural tracts are thirty-five acres. It relieves the division from county subdivision review; it does not exempt the parcel from zoning, a building code where one is adopted, septic or well rules.

Home businesses in the shop

Running a business from the shop half of a barndominium is a zoning question. Many districts allow home occupations with limits on employees, customers, signage and outdoor storage; commercial-scale use may need a different district or a special use approval.

Converting an existing barn

Turning an agricultural building into a dwelling is a change of use. Where a county has a building code, expect to treat it like a new house: Elbert County's conversion checklist, for example, asks for health-department approval, an engineer's sign-off on the existing foundation and an engineer's observation of the existing structure.

Covenants and HOAs

Private rules sit on top of public ones, and a permit does not override them.

A permit does not authorise what covenants prohibit

Elbert County states that issuing a county building permit will not legally authorize what private covenants prohibit, that HOA approval is the applicant's responsibility, and that the county does not review, monitor or enforce HOA covenants.

What rural covenants commonly restrict

Metal exterior materials, minimum house size, outbuilding size and placement, livestock, and building before the house is finished. Read the recorded covenants and any architectural guidelines before you buy, and get written approval before you order a building package.

What a barndominium is not, legally

The labels matter because different rules follow them.

Not a manufactured or modular home

Factory-built structures sold in Colorado carry a Division of Housing insignia, and sellers of manufactured and tiny homes register with the division. A site-built steel or post-frame barndominium is regulated by the local building department where one exists, not by that factory-built programme.

Not an agricultural building once people live in it

The agricultural exemption in C.R.S. 30-28-205 is for buildings used solely to shelter implements, farm products or animals. Living quarters take a building out of it.

Not exempt from state rules where there is no building code

A county without a building code has no building permit to issue, but the septic permit, the well permit, state electrical and plumbing inspection, and any wildfire code a local government has adopted still apply.

Lenders, appraisers and insurers

Legal is not the same as financeable or insurable. These parties apply their own standards.

Lenders want the permit trail

A construction or permanent lender will usually ask for permits, final inspections and a certificate of occupancy where the jurisdiction issues one. In a place with no building code, expect questions about how the structure was designed and who inspected it; engineered drawings and third-party inspection reports help.

Appraisers need comparable sales

The appraisal values the house against nearby sales. A combined house and shop can have few true comparables, which affects the loan amount rather than legality.

Insurers price the address

Wildfire exposure, hail and the roof material all affect cover. Ask an insurer how it classifies the building and the roof before you finalise the design.

Sale disclosures

Under C.R.S. 38-35.7-104, listing and sale contracts for residential property disclose the potable water source, with a copy of the current well permit where the source is a well. Keeping the well permit, septic records and inspection records makes the eventual sale simpler.

Six questions that settle whether your barndominium is legal where you want it

Ask these of the offices responsible for your specific parcel.

1. Is the land inside a city or town, or unincorporated?

That decides whose building code and zoning apply.

2. Which building code and edition does that government enforce — if any?

And does it require a soils report, an engineered foundation or sealed structural drawings?

3. Does the zoning allow a dwelling, the building's size and height, and the shop use?

Get the answer in writing from the planning office.

4. Is the parcel in the mapped wildland-urban interface, and at what fire intensity?

That decides whether the wildfire code applies and which tier of hardening it requires.

5. Will the local public health agency permit a septic system, and what well permit can the parcel get?

Parcel size under thirty-five acres generally limits a new household well to in-house use.

6. Do recorded covenants or an HOA restrict metal buildings, size or animals?

A county permit will not override them.

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What's different about Colorado

There is no statewide residential building code

C.R.S. 30-28-201 authorises a board of county commissioners to adopt a building code for all or part of the county outside incorporated cities and towns; it does not require one. Cities and towns regulate construction within their limits under C.R.S. 31-15-601 or their home-rule charters. So the code that applies to a barndominium depends on where the land is: a city or town code inside municipal limits, a county code in the unincorporated area where the county has adopted one, and no building code at all in places where neither applies. Denver, as a consolidated city and county, has its own. Ask the building department for your address which code and edition it enforces.

The agricultural exemption does not cover a home

Where a county has adopted a building code, C.R.S. 30-28-205 makes it unlawful to build any structure, dwelling or building in the designated area without a permit, except buildings used solely to shelter agricultural implements, farm products, livestock or poultry. A barndominium with living quarters is a dwelling. Calling it a barn does not move it into the exemption, and a building permitted as an agricultural structure cannot later be occupied as a home without meeting the code for one.

The energy code floor binds governments that have a code

HB22-1362 amended C.R.S. 30-28-211 for counties, with a parallel provision for municipalities. A county that has adopted a building code must adopt and enforce an energy code, and when it updates its codes it must move forward: updates made from 1 July 2023 must meet the 2021 IECC plus electric-ready and solar-ready provisions, and updates from 1 July 2026 must meet a model low energy and carbon code. Counties under thirty thousand people can stay on one of the last three IECC editions if they apply for and are refused a state training grant. The law does not impose an energy code where there is no building code, and it exempts buildings with no conditioned space.

The wildfire code: a state minimum that local governments must adopt

SB23-166 created the Wildfire Resiliency Code Board, which adopted the Colorado Wildfire Resiliency Code on 1 July 2025. Under C.R.S. 24-33.5-1237, every city, town, county and fire protection district with jurisdiction in the mapped wildland-urban interface and authority to adopt building or fire codes must adopt a code that meets or exceeds it. The 2024 edition of the statute gave three months to do so; SB25-142, signed on 3 June 2025, extended that to nine months, which set the deadline at 1 April 2026. A 2026 bill to push it to 1 April 2027, HB26-1334, was postponed indefinitely in committee. Where the code applies it requires a Class A roof and ember-resistant vents and gutters, and in moderate and high fire-intensity areas restricts siding, eaves and decks. It exempts a thirty-five acre parcel with only one residential structure that does not abut a residential or commercial area. Local governments without their own enforcement can ask the state fire division for inspection support; otherwise enforcement is local.

Septic: a permit from the local public health agency

C.R.S. 25-10-106 requires local boards of health to run the permit process for on-site wastewater treatment systems: the local public health agency reviews the application and inspects the site, the health officer issues the permit, and the finished system is inspected before it is used. CDPHE's septic page says that for systems of 2,000 gallons per day or less, permitting is conducted by local counties, each under rules at least as stringent as the state's Regulation 43. This applies whether or not the county has a building code.

Wells: a state permit, and the thirty-five acre rule

Household wells are permitted by the State Engineer through the Division of Water Resources. Under C.R.S. 37-92-602, an exempt well may serve up to three single-family dwellings, fire protection, poultry, domestic animals and livestock and irrigate up to one acre of garden and lawn — but the permit presumption for the only well on a smaller residential site covers use solely inside one single-family dwelling, with no irrigation, while the broader uses are available as the only well on a tract of thirty-five acres or more. Designated groundwater basins and the Denver Basin aquifers carry their own rules. Check what permit a parcel can get before you buy it.

Electrical and plumbing: state-licensed trades, state inspection as the fallback

Electricians and plumbers are licensed by state boards under C.R.S. articles 12-115 and 12-155. Where a town, city or county runs its own electrical or plumbing inspection programme, it inspects; where it does not, C.R.S. 12-115-120 and 12-155-120 require inspection by state inspectors. A utility may not provide permanent service to a new installation without proof of final electrical approval. Licensed plumbers and electricians handle those trades on a barndominium, as on any house.

Plans: engineers yes, architects not required by state law for a house

Colorado's architect licensing article exempts plans for one- to four-family dwellings (C.R.S. 12-120-403), so state law does not require an architect for a single-family barndominium. Building departments can and often do require structural drawings sealed by a Colorado-licensed professional engineer — Elbert County's new-residence checklist asks for structural design stamped by one, along with a soils report and an engineered foundation.

Common questions

The 9 asked most often. If yours is not here, ask it directly.

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Are barndominiums legal in Colorado?
Yes. No Colorado law prohibits them, and a barndominium with living quarters is regulated as a house by whichever city, town or county has jurisdiction, alongside zoning, septic, well, electrical, plumbing and — in mapped areas — wildfire rules.
Does Colorado have a statewide building code for houses?
No. Under C.R.S. 30-28-201 counties may adopt a building code for unincorporated land, and cities and towns adopt their own. State law sets mandates on those governments — an energy code for those that have building codes, and a wildfire code in mapped wildland-urban interface areas — but does not itself impose a residential building code on every parcel.
Can I build a barndominium without a permit in rural Colorado?
Only the building permit depends on whether the county has adopted a building code, and where it has, the agricultural exemption does not cover a dwelling. Septic permits from the local public health agency, well permits from the Division of Water Resources and electrical and plumbing permits and inspections apply whether or not a building code does.
What is the 35-acre rule in Colorado?
There are two. Under C.R.S. 30-28-101(10)(b), dividing land into parcels of thirty-five acres or more is not a subdivision for county subdivision review. Under C.R.S. 37-92-602, the only well on a tract of thirty-five acres or more can qualify for household use plus livestock and up to an acre of irrigation, where the only well on a smaller residential lot is generally limited to use inside one home. The wildfire code also exempts a thirty-five acre parcel with only one residence that does not abut a residential or commercial area.
Does the wildfire code apply to my barndominium?
If the parcel is in a mapped wildland-urban interface area and the local government has adopted the code, yes — with Class A roofing and ember-resistant vents and gutters at a minimum, and restricted siding, eaves and decks at moderate and high fire intensity. Local governments were required to adopt it by 1 April 2026 under SB25-142. Ask your building or fire department whether it applies to your address.
Does Colorado's energy code apply to a barndominium?
Where the city, town or county has a building code, it must also enforce an energy code under HB22-1362, and a barndominium's living space meets it like any house. Where there is no building code, the energy-code mandate does not reach the parcel.
Do I need an architect to design a barndominium in Colorado?
Not under state law for a one- to four-family dwelling, which C.R.S. 12-120-403 exempts from the architect requirement. Many building departments do require structural drawings sealed by a Colorado-licensed professional engineer.
Who inspects the wiring and plumbing if my county has no inspectors?
State inspectors. Where no local electrical or plumbing inspection programme exists, C.R.S. 12-115-120 and 12-155-120 require inspection by state electrical and plumbing inspectors, and a utility cannot connect permanent power without final electrical approval.
Can an HOA stop me building a barndominium?
Covenants can restrict metal exteriors, building size and outbuildings, and a county permit does not override them. Elbert County, for example, states that its permits do not authorize what private covenants prohibit.

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Sources

  1. C.R.S. 30-28-201 — county building codes (commissioners may adopt)
  2. C.R.S. 30-28-205 — county building permits and the agricultural exemption
  3. C.R.S. 30-28-211 — county energy codes (HB22-1362)
  4. C.R.S. 24-33.5-1237 — application of wildfire resiliency codes
  5. SB25-142 (Session Laws 2025, ch. 367) — nine months for local adoption of the wildfire code
  6. HB26-1334 — proposed extension to 1 April 2027 (postponed indefinitely)
  7. Colorado Division of Fire Prevention and Control — Colorado Wildfire Resiliency Code
  8. C.R.S. 25-10-106 — on-site wastewater treatment systems, local administration
  9. CDPHE — On-site wastewater treatment systems (Regulation 43)
  10. C.R.S. 37-92-602 — exempt wells and the thirty-five acre presumption
  11. Colorado Division of Water Resources — Well Permitting
  12. C.R.S. 30-28-101 — definitions, including the thirty-five acre subdivision exemption
  13. C.R.S. 30-28-111 — county zoning plan
  14. C.R.S. 12-115-120 — electrical permits and state inspection
  15. C.R.S. 12-155-120 — plumbing permits and state inspection
  16. C.R.S. 12-120-403 — exemptions from architect licensing
  17. C.R.S. 38-35.7-104 — disclosure of potable water source
  18. Elbert County — HOA Compliance and County Liability Statement
  19. Elbert County — New Residence Checklist and permit flow chart

Keep reading

The pages that answer the next question this one raises.

Permitting help

Working out which offices regulate your parcel and assembling complete applications for each.

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Barndominium build timeline

How septic, well, wildfire and building permits sequence on the calendar.

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Barndominium pros and cons in Colorado

Wildfire, soils, snow loads, water and resale.

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Site preparation

Soils, pad, drainage and septic placement for the permit you need.

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Barndominium kits vs modular and prefab homes

Division of Housing insignia and installation rules for factory-built homes, against a local permit for a kit.

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Service areas

Local notes on who issues permits across the places we serve.

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Tell us about your land

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