DENVER GUIDE

Permits and inspections for heating and cooling work in Denver

A new furnace is on the quote, and nobody has said the word permit. In Denver the office to ask is Community Planning and Development, reached through denvergov.org. This page does not invent a license class, a fee, or a code section. It tells you which questions belong to that office and which belong to the contractor standing in the closet.

By Mike Maziarz · Sources checked October 6, 2026 · How we write these guides

The office that matches the address

Denver Community Planning and Development is the city office for building permits inside Denver. Start at denvergov.org and look for the permit path that matches a residential mechanical job, then confirm you are in the right menu before you trust a screenshot from a different year. Rules change. This guide will not freeze them into a counterfeit checklist.

The address decides the counter. Aurora, Lakewood, and Arvada are nearby cities people commute from, and each keeps its own permit counter. A conversation that was correct for a Denver lot is not a permission slip for a house across the line. Say the city of the job first. If you are unsure whether the house is in Denver, that uncertainty is the first question, not a detail to skip.

This page will not tell you whether Colorado requires a statewide license. Ask instead who may do this scope at this address, who pulls the permit, and who calls for the inspection. The city, and any office it directs you to, is the source. A magnet on a truck is not.

Which scopes are worth the question

Replacing a furnace, a boiler, an outdoor condenser, a heat pump, or an air handler is the kind of work people take to the counter. Repairing a single part, changing a filter, or swapping a thermostat battery is usually a different conversation. 'Usually' is not a ruling. If the quote is ambiguous, ask the office about this scope instead of inheriting the contractor's shrug.

A cooling replacement is a clear example. The outdoor unit, the indoor coil, and the lines between them may be one job or three, depending on what is actually being changed. The air conditioner not cooling page is about the symptom. This page is about the permission to change the equipment once someone says the old condenser should come out. Describe the equipment, not the slogan on the estimate.

Like-for-like language deserves a follow-up. Ask what is being removed, what is being set, and whether the venting, the gas piping, the electrical circuit, or the condensate path changes. A same-size label can hide a new flue or a new circuit. Those are the words to repeat to the permit staff if you call them.

What an inspection is for

An inspection is the city looking at the work it asked to see. Ask the contractor when the inspection happens, who must be there, and what has to stay visible. Covering a vent joint, a gas connection, or a condensate trap with drywall before the inspection is a sequence problem. Ask before you close the ceiling.

This page will not list code sections or pretend to be the inspector's form. Reasonable questions you can ask the city and the contractor include whether they will look at the appliance, the vent, the combustion air, the disconnect, and the drain. Write their answers. If the answers disagree, the city is the one that signs the inspection.

A failed inspection is not an insult. It is a list. Ask for the list in words you can match to the closet. Correcting it is part of the job you already started. Offering to skip the re-inspection to 'save a trip' is how work stays unfinished. Keep the permit number in the same note as the equipment model.

City permits and federal refrigerant rules

A local permit and a federal refrigerant rule are different layers. Opening a charged circuit, recovering refrigerant, and choosing a refrigerant for a new system sit with EPA requirements, including the Section 608 rules for technicians who handle refrigerant. The city does not become those rules, and those rules do not replace the city's permit. The refrigerant basics page is the homeowner side of that boundary: do not add refrigerant yourself, and do not treat a can as a shortcut around either layer.

Ask the contractor who will handle the refrigerant and whether that person is allowed to. You are not collecting a license number to publish. You are listening for a straight answer. If the outdoor unit is being changed, ask what refrigerant the new equipment uses and what happens to the old charge. 'Vented to the air' is not an acceptable description of a plan.

EPA's SNAP program is where refrigerant alternatives are discussed at the federal level. You do not need to become a refrigerant chemist to ask whether the product in the quote is one the equipment is built for. The nameplate and the installation papers should agree. If they do not, stop the startup.

Emergencies do not erase the paperwork

A no-heat night can justify a temporary repair that makes the house safe. It does not automatically justify a full replacement installed with no permit conversation. The no-heat emergency page is about people, gas odor, and alarms. After everyone is safe, the scope that remains is still a scope. Ask what was done under pressure and what still needs the city.

If a contractor says permits are 'not enforced' or 'nobody pulls them for this,' treat that as a claim to verify, not a favor. Call Community Planning and Development or use the path on denvergov.org and describe the work without the sales adjectives. You want a yes, a no, or a 'this needs a review,' in their words.

Keep temporary heat safe while the paperwork catches up. Do not run ovens, grills, or a car in the garage as a bridge. A permit delay is inconvenient. Carbon monoxide is not a paperwork problem.

Questions for the person who pulls it

Ask who pulls the permit: the contractor, a subcontractor, or you. Homeowners sometimes may pull certain permits and sometimes may not. This page will not guess which. Ask the office. If the contractor pulls it, ask for the permit number when it exists, and ask to be named in a way that lets you check the status yourself.

The questions before hiring belong in the same phone call: insurance, who comes to the house, what the written scope includes, and whether they will explain elevation setup on a furnace or boiler. A permit answer with no scope is a form. A scope with no permit answer is a truck in the alley. You want both sentences.

Do not invent a license class to sound informed. Say 'what license or registration does this work require here, and whose name is on it?' Then check that answer with the office that issues it. A number you cannot verify is a costume. The useful note is the name, the office, and the permit status on the day of the inspection.