Bottom Line
For a standard residential HVAC replacement (1-for-1, no plan review required), permit approval typically takes same day to 24 hours after a complete application is submitted online. The inspection happens after installation and typically takes another 1–5 business days to schedule.
Permit Approval Timeline
The fastest and most important factor is whether plan review is required. For residential replacements of existing equipment, plan review is almost never required — the permit is issued over-the-counter or through an online portal with minimal review. For new installations, commercial projects, or non-standard configurations, plan review adds time.
| Project Type | Plan Review Required? | Typical Approval Time |
|---|---|---|
| Residential replacement (1-for-1) | No | Same day – 24 hours |
| Residential new installation | Sometimes | 1–5 business days |
| Mini-split, new circuit | Rarely | Same day – 2 business days |
| Commercial HVAC | Almost always | 5–15 business days |
| Large commercial / design-build | Always | 2–6 weeks |
Inspection Timeline
After installation is complete, you (or your contractor) request an inspection. The time from request to inspection appointment varies by jurisdiction and season:
- Slow season (spring/fall): Inspections typically available 1–3 business days after request
- Peak season (June–August, December–January): Demand surges. Inspection wait times of 5–10 business days are common in busy jurisdictions. Plan accordingly.
- Rural counties: Faster — often next-day availability year-round
- Large urban jurisdictions (Los Angeles, Chicago, NYC): Slowest — 1–2 week inspection waits are not uncommon during peak periods
What Slows Permits Down
- Incomplete applications: Missing license number, no equipment details, wrong address format — all cause delays while the department requests additional information
- Peak HVAC season: Summer and winter permit volume spikes dramatically. Apply early if possible.
- Equipment substitution: If your contractor submits a permit for one model and installs another, an amended permit application is required before inspection
- Contractor credentials issues: Expired license, missing insurance certificate, unpaid contractor registration fees — these block permit issuance until resolved
- Plan review required: New installations, changes to ductwork serving multiple floors, commercial projects — all trigger plan review that adds days or weeks