How building permits work in Colorado
These rules apply across Colorado. Each local guide above covers what is specific to that city or county: its building department and contacts, the codes it has adopted, fees and inspections.
Local codes and what the state decides
Colorado has no statewide building code for private buildings. State law lets each city, town and county decide whether to adopt one and which edition — roughly 270 municipalities and 64 counties, each choosing for itself (C.R.S. 30-28-201 and 31-15-601). That makes the edition in force in any one city or county a local question, and an exempt list or fee schedule from a neighbouring jurisdiction unreliable. The state does set codes for some buildings: public schools (through the Division of Fire Prevention and Control), factory-built homes, and hotels, motels and apartment buildings in places with no local code (State Housing Board). What it does not make Colorado is a state where nothing is decided centrally.
Four things Colorado decides centrally, whatever the local code says
First, electrical and plumbing: the National Electrical Code and the Colorado plumbing and fuel gas codes are state baselines. The State Electrical Board and the State Plumbing Board issue permits and inspect only where a city or county has no inspection programme of its own; most of the larger cities and counties run their own.
Second, energy: no jurisdiction is compelled to update its codes, but when one updates its building codes it must adopt at least the state’s minimum energy code (House Bill 22-1362). For updates made on or after 1 July 2026, that minimum is the Colorado Model Low Energy and Carbon Code; updates between July 2023 and June 2026 needed the 2021 International Energy Conservation Code plus the state’s electric-ready and solar-ready code. Small rural counties, updates that only adopt the state electrical or plumbing code, and adopting the wildfire code on its own do not trigger the requirement. So the floor arrives with each local update rather than on a statewide date.
Third, the conflict rule: where the energy provisions or the state model codes conflict with the Colorado plumbing code or the National Electrical Code, the plumbing code or the electrical code prevails.
Fourth, wildfire: the state’s Colorado Wildfire Resiliency Code, adopted on 1 July 2025, sets minimum rules inside the mapped wildland-urban interface. Cities, counties and fire districts there had to adopt it by 1 April 2026. It applies to new buildings, additions over 500 square feet, new wooden decks, and exterior work that affects a quarter or more of the walls or roof, such as a large re-roof. It does not otherwise require existing homes to be upgraded.
Altitude derating, snow loading and expansive soils are live design constraints across much of the state.
Public schools are always a state matter. Whatever the local programme, electrical work (C.R.S. 12-115-120) and plumbing or gas piping work (C.R.S. 12-155-120) in a public school must be inspected by a state inspector, and the Division of Fire Prevention and Control issues public school building permits or lets a pre-qualified local department review and inspect them. The state boards also permit and inspect state buildings.
Three questions, three different answers. Which edition did this jurisdiction adopt, and when did it last update? Who holds the electrical and plumbing permits here, the city or the state board? And is the parcel inside the mapped wildland-urban interface? None of the three can be assumed from a neighbouring jurisdiction.
Contractor licensing and trade permits
Colorado has no state general contractor licence. General contractor licensing is done by municipalities and counties, many of which also require a surety bond, so a credential earned in one Front Range city does not necessarily travel to the next. The trades are the opposite: electricians and plumbers are licensed by the state, through the State Electrical Board and the State Plumbing Board, and those licences are statewide. A journeyman electrician works under a registered electrical contractor and cannot independently pull permits.
Trade permits in Colorado are not necessarily issued by the same body as the building permit. Where the city or county runs its own electrical or plumbing inspection programme, the trade permit is local. Where it does not, the permit and the inspection come from the state board instead.
- Electrical work follows the National Electrical Code as adopted by the state and amended locally, performed by a state-licensed electrician working for a registered electrical contractor.
- Plumbing and fuel gas piping follow the Colorado plumbing and fuel gas codes, performed by a state-licensed plumber for a registered plumbing contractor, and are permitted with the plumbing.
- Mechanical work follows whichever mechanical code the jurisdiction adopted, permitted locally.
Since 29 May 2026, a permit application for a project over $1 million must include a signed declaration about workers’ compensation coverage (Senate Bill 26-093).
How permit fees are structured
| Fee component | How it works |
|---|---|
| Building permit | Set by the local jurisdiction on valuation or square footage; there is no state building fee schedule |
| Plan review | A percentage of the permit fee or a flat charge, set locally |
| Electrical | A state board permit fee where no local electrical programme exists; a local fee where one does |
| Plumbing | The same split as electrical, against the Colorado plumbing code |
| Energy compliance | Documentation for whichever energy code the jurisdiction adopted under House Bill 22-1362 |
| Wildland-urban interface | Additional review where the parcel sits inside the mapped interface |
Permit validity and state inspections
Approvals do not stay live indefinitely. Local permit validity periods are set by the adopting jurisdiction and differ between neighbours. Where the state boards issue the electrical or plumbing permit, it is valid for 12 months from issue; the board can issue a longer permit, up to three years, for large jobs, or extend one once by six months if you ask before it expires. On phased or financed work, confirm both clocks and keep them alive with progress inspections.
Where the state boards hold the electrical or plumbing permit, plan around two inspection queues: their inspectors attend on the state’s schedule and the local inspector will not sign off that trade. State board policy is that the contractor or a representative, or an adult homeowner or their representative, must be present for the inspection of an occupied dwelling unit — so an unattended property cannot be inspected.