📋 Quick Facts — Generator Permit in Denver
| Detail | Info |
|---|---|
| Permit Required? | Yes — in most cases |
| Permit Type | Electrical + Mechanical Permit |
| Permit Office | Community Planning and Development (CPD) |
| Phone | (720) 865-2705 |
| Hours | Mon–Fri business hours |
| Online Portal | Apply Online |
| Fee / Timeline | Current Data |
|---|---|
| Generator Permit Fee | Electrical panel/service upgrade: $43 total (quick permit). |
| Approval Time | Simple residential: 1–3 days via online portal |
| NEC Edition (CO) | 2023 |
| Permit Authority | Denver and state buildings only. Other jurisdictions have 'home rule' — each cit |
Do I Need a Generator Permit in Denver?
The short answer: almost always yes. REQUIRED for standby (permanently installed) generators in virtually all jurisdictions — and Denver is no exception. The Community Planning and Development (CPD) enforces electrical + mechanical permit requirements for residential and commercial work.
✅ Work That Always Requires a Permit
- Standby generator permanently connected to home electrical system
- Transfer switch installation (manual or automatic)
- New gas line to generator (if gas-powered)
💰 Generator Permit Fees in Denver (2026)
Permit fees in Denver are set by Community Planning and Development (CPD). Here's the current fee structure for generator work:
| Fee Item | Amount |
|---|---|
| Generator Permit | Electrical panel/service upgrade: $43 total (quick permit). |
Source: Denver CPD fee schedule, verified March 23, 2026. Denver uses SAME valuation-based formula for ALL trade permits. Quick permits (water heater, roof, light fixtures) have NO plan review fee. Plan review = 50% of permit fee for projects over $2,000.
* Fees may change. Always verify current rates with Community Planning and Development (CPD) at https://www.denvergov.org/CPD.
🔍 Inspection Requirements
After the permit is issued, Denver requires inspections at key stages. Do not cover work before it's inspected.
- Gas Line Rough-in: Gas line sizing, pressure test, proper flex connector to generator.
- Electrical Rough-in: Transfer switch installation, connection to panel, wiring to generator.
- Final Inspection: Full operational test, ATS functionality, proper setback from windows/doors (typically 5 feet min), exhaust direction away from openings, proper grounding.
📝 How to Apply for a Generator Permit in Denver
- Verify your contractor is licensed — Licensed Electrician for electrical permit. Licensed Gas Plumber or Mechanical Contractor for gas line. General or specialty contractor for concrete pad installation..
- Gather required documents — Equipment specs, site plan, load calculations where applicable.
- Submit the application — Online at Community Planning and Development (CPD) or in person.
- Pay the permit fee — Electrical panel/service upgrade: $43 total (quick permit)..
- Post the permit — Keep a copy on-site until all inspections pass.
- Schedule inspections — Do not cover work until the inspector signs off.
📌 Colorado State Requirements
In addition to Denver's local rules, these state-level requirements apply:
- Denver has its own permit system — Denver Community Planning and Development
- Colorado Springs, Fort Collins, Boulder all have own permit offices
- Mountain towns (Aspen, Vail) — very strict, slow permit process, high fees
- Front Range: Class 4 hail-resistant roofing common due to insurance requirements
🚫 Common Generator Permit Mistakes in Denver
- Installing generator too close to windows or HVAC return air intake — carbon monoxide hazard and code violation
- Transfer switch work without permit — major code violation
- Not sizing gas line for combined BTU load (if other gas appliances on same line)
- Skipping the concrete pad requirement — some jurisdictions require permanent pad for standby units
💡 Pro Tips from Contractors
- Get the electrical AND gas permits at the same time — saves a second trip to the building department
- Confirm setback distance from windows and doors before ordering — some HOAs and cities are stricter than code minimum
- Size the gas line for peak BTU load including all other gas appliances on the same line
- In CA/SoCal: check CARB compliance before ordering the generator unit — some models are not permitted in certain air districts
Notes specific to Denver:
- Denver has 'home rule' — own permit office separate from rest of CO
- NEC 2023, IRC 2021 for Denver
- Colorado Springs, Fort Collins, Boulder all have own separate permit offices
- Hail-resistant (Class 4) roofing very common — insurance-driven, not always code-required but commonly installed
Get Your Exact Generator Permit Requirements in 5 Seconds
Our AI searches live building department data for Denver and all 50 states — returning the exact permit requirements, fees, and application links for your job. No hold music. No guessing.
Run a Free Permit Check →❓ Frequently Asked Questions
Do I need a generator permit in Denver, CO?
Yes, in most cases. REQUIRED for standby (permanently installed) generators in virtually all jurisdictions. In Denver, contact Community Planning and Development (CPD) at https://www.denvergov.org/CPD.
How much does a generator permit cost in Denver?
In Denver: Electrical panel/service upgrade: $43 total (quick permit).. Fees may change — always confirm with Community Planning and Development (CPD) before applying.
How long does a generator permit take in Denver?
Simple residential: 1–3 days via online portal. Simple residential trade work is often issued same-day or within 1–3 business days.
Who can pull a generator permit in Colorado?
Licensed Electrician for electrical permit. Licensed Gas Plumber or Mechanical Contractor for gas line. General or specialty contractor for concrete pad installation.