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Do I need an HVAC permit in Boulder? The City mechanical license rule, the 2026 fee table and finals

Yes: Boulder requires a City mechanical permit for a furnace, AC, boiler or heat pump, and it issues one only to a contractor holding a City of Boulder mechanical license or to a homeowner doing the work on their own home. The City issued 4,460 HVAC and mechanical permits on homes from October 2023 to September 2026; the usual one was filed at $10,572 and passed final 76 days after issue.

By Contractor Records · data through October 16, 2026

The Boulder rule

Boulder ties the permit to its own license. From the City's Contractor Licensing page (read 23 October 2026):

  • "No person shall perform any work as a mechanical contractor in the city without first obtaining a mechanical contractor license to perform such work."
  • "No mechanical permit shall be issued for work to be done by a person who does not have a valid, current mechanical contractor's license as required by the city for the type of work to be performed, except for a homeowner performing work on their own home."
  • "Boulder does not accept reciprocal licenses from other jurisdictions."

A licensed plumbing contractor may install fuel gas piping without a mechanical license. Wiring for a heat pump or new condenser is electrical work, which needs a Colorado-licensed electrician registered with the City and its own electrical permit.

Boulder mechanical license What it covers
Class A Any work under the City mechanical and fuel gas codes
Class B Mechanical and fuel gas work for commercial and dwelling units, except commercial kitchen hoods and H or I occupancies
Class C Work under the residential mechanical code for one- and two-family dwellings and townhomes
Class D Commercial kitchen hoods and ventilation
Class E Boilers, water heaters and hydronic installations

For a furnace, AC or heat pump on a house, the license should be Class A, B or C; a Class E firm covers a boiler. New applicants prove competency with an ICC certification and file a certificate of insurance.

How to apply and get inspected

  1. Check the license. Search the firm in the City's Customer Self Service portal or the Licensed Contractors list on Boulder Open Data, and confirm the class.
  2. Apply in CSS. The portal lets applicants "Fill out select applications online", "Pay select fees" and "Check the status of your application"; the City publishes a Permit Application Guide there.
  3. Inspections are requested in the same portal ("Request inspections or view daily inspection schedule").
  4. Final. Afterwards the permit and its status are public in the City's Construction Permits open data, where our figures come from.

What it costs

From the City's 2026 Schedule of Fees, mechanical permit fee (Section 4-20-13), "based on the value of the mechanical materials and labor":

Cost of labor and materials Fee
$100 or less $13.60
$100.01 to $400 $16.75
$400.01 to $800 $19.90
$800.01 and above $19.90 for the first $800, plus $3.75 for each additional $100 or fraction

Worked out from the table:

Job value Mechanical permit fee
$5,000 furnace $177.40
$10,000 system $364.90
$15,000 heat pump $552.40

The fee "is doubled on permits for work started or completed without an approved permit", and the rates in effect at the time of application apply. A heat pump's electrical permit is charged separately. Use-tax pre-payment is described in the schedule for building and right-of-way permits; ask the City whether it applies to your mechanical permit before you budget for it.

What 4,460 Boulder HVAC permits show

Measure Boulder HVAC and mechanical
Permits on homes, October 2023 to September 2026 4,460
Firms 324
Firms with a permit in the last 12 months 205
Usual filed value $10,572
Middle half of firms' usual value (3+ permits) $7,750 to $15,000
Passed final (permits a year or more old) 70.2%
Usual days from issue to final 76
Firms with 10+ permits passing under 70% 29 of 55
Firms matched to a current City license 73.1%
Busiest / quietest month August (131) / February (72)

At the usual filed value of $10,572, the City's mechanical fee is under $400, a small line next to the job. The number that matters more is the final: only 70.2% of Boulder HVAC permits a year or more old passed, and more than half of the busy firms (29 of 55) pass under 70%. An unfinaled permit stays open on your address. Write the final inspection into the contract and hold the last payment until CSS shows it passed. Prices by job size: Boulder HVAC cost page.

See every Boulder HVAC contractor by permits passed and City license →

Next steps

Compare firms on the Boulder HVAC list and follow hiring an HVAC contractor in Boulder. License and permit lookups: Boulder contractor license lookup and Boulder building permit search. Monthly counts: Boulder permit statistics. National prices: HVAC replacement cost; other cities: do I need a permit for HVAC replacement.

What this does not tell you

City of Boulder only; Louisville, Lafayette and unincorporated Boulder County permit separately. "Passed final" counts a permit that expired without a final as not finished, so a low share can mean the final was never booked. Our license status is a name match to the City's list, not a check of the class.

How we know this

License rules and classes are quoted from the City of Boulder's Contractor Licensing page and portal functions from its EnerGov CSS page, read 23 October 2026; fees from the 2026 Schedule of Fees, with worked examples computed by us. Counts are City of Boulder construction permits on homes classified as HVAC or mechanical, October 2023 to September 2026; "passed final" uses permits a year or more old, days are the median from issue to final, and license status is our name match to the City's licensed contractors list.

Numbers come from City of Boulder construction permits, data through October 16, 2026. Nobody paid to be on this page and nobody can.

Questions

  • Do I need a permit to replace a furnace or AC in Boulder?

    Yes, a City mechanical permit. Boulder's licensing rules say no mechanical permit is issued for work by anyone without a valid, current City mechanical contractor license, 'except for a homeowner performing work on their own home', so a contractor's change-out should show a mechanical permit in its name.

  • How much is a mechanical permit in Boulder?

    The 2026 fee is based on the cost of labor and materials: $13.60 up to $100, $16.75 to $400, $19.90 to $800, then $19.90 plus $3.75 for each further $100. A $10,000 system is $364.90; the fee doubles if work started without a permit.

  • Can a homeowner pull an HVAC permit in Boulder?

    Yes, for work you do yourself on your own home. The City's homeowner exception covers a homeowner 'performing work on their own home'; anyone you hire to do mechanical work needs a City mechanical license.

  • How long does an HVAC permit take in Boulder?

    The usual Boulder HVAC permit in our file passed final 76 days after it was issued, and 70.2% of those a year or more old passed final at all.

  • Does Boulder accept a Denver or state HVAC license?

    No. The City says 'Boulder does not accept reciprocal licenses from other jurisdictions'. A mechanical contractor needs a City of Boulder license, Class A, B or C for residential HVAC, backed by an ICC certification and insurance.

Build your own list

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Boulder HVAC & mechanical

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Sources
  1. Contractor Licensing — City of Boulder (accessed 2026-10-23)
  2. City of Boulder, Planning and Development Services 2026 Schedule of Fees (accessed 2026-10-23)
  3. EnerGov Customer Self-Service Portal — City of Boulder (accessed 2026-10-23)
  4. Licensed Contractors — City of Boulder Open Data (2026-10-23)
  5. Construction Permits — City of Boulder Open Data (2026-10-23)