Houston Commercial HVAC Permits Only

Houston RTU Permit

Replacing a rooftop unit in Houston can turn into a plan check loop fast—especially when the application, AHRI, and COMcheck don’t line up, or when a curb adapter triggers structural documentation. This page is a straight checklist + a clean submission path.

Submit an RTU Job Jump to RTU Checklist

48hr

Submission Target*

Houston iPermits
Submission

COMcheck · AHRI
RTU Changeouts

*Submission target assumes complete info and documents. City review timelines vary by scope and workload.

RTU permit kickbacks

Most common issues

Avoid

Model numbers don’t match

Application vs AHRI vs COMcheck

Curb adapter paperwork

Structural/wind-load documentation (scope-dependent)

Unsigned COMcheck

PDF missing preparer signature

If you’ve ever heard “please resubmit with corrected documents,” use the checklist below (or let FlashPermit handle it).

RTU-focused permit expediting (Houston)

✓ RTU Changeouts ✓ COMcheck (when required) ✓ AHRI Verified ✓ iPermits Submission ✓ Commercial Only
Search intent

“Houston RTU permit” searches mean someone is already mid-job.

They usually want a clean packet checklist, want to know what trips plan check, and want the fastest path to submission.

Fast filing

“What do I need to submit so it doesn’t get kicked back?”

Avoid kickbacks

“Model numbers, AHRI, COMcheck—what has to match?”

Curb adapter concerns

“Do I need a structural/wind-load letter?”

Portal frustration

“iPermits uploads and formatting rules.”

When it’s typically required

RTU changeout scopes that commonly trigger permits

  • • Commercial RTU replacement (many like-for-like swaps)
  • • Capacity/tonnage changes or equipment relocation
  • • Duct/venting changes tied to the RTU scope
  • • Curb adapters or roof load/wind concerns (documentation often requested)

Final requirements depend on scope and AHJ. This page is practical guidance, not official city instruction.

RTU permit packet checklist

A clean Houston RTU permit packet (commercial HVAC)

Documents to have ready

  • • Permit application (commercial mechanical)
  • • Scope of work letter (tonnage, location, like-for-like?, curb notes)
  • • RTU cut sheet (model numbers + efficiency data)
  • • Matching AHRI certificate (where applicable)
  • • COMcheck report (when triggered)
  • • Contractor/license details (portal linkage)
  • • Correct address + suite

RTU-specific “gotchas”

  • • Model numbers don’t match across docs
  • • COMcheck PDF missing preparer signature
  • • Curb adapter scope without supporting documentation (when requested)
  • • Vague scope (“replace RTU”) without details
  • • iPermits upload/formatting problems

FlashPermit’s job is alignment: your application, AHRI, and COMcheck should tell one consistent story before it hits plan check.

Tip

Photos help

Nameplate + roof conditions can reduce back-and-forth.

Tip

Be specific

Like-for-like vs capacity change drives requirements.

Tip

Curb notes

Existing curb vs curb adapter matters.

Curb adapters & roof documentation

Curb adapters: where RTU permits often slow down

RTU swaps that involve curb adapters or roof load/wind concerns can require additional documentation. Whether it’s required depends on scope and AHJ, but it’s a common plan check comment area.

What plan check typically wants

  • • Clear scope notes: existing curb vs adapter
  • • Correct model numbers and equipment docs
  • • Structural/wind-load documentation (when requested)

Why it gets kicked back

  • • “Provide stamped structural analysis…”
  • • Missing or inconsistent curb details
  • • Documents don’t match the submitted scope

We don’t invent requirements—we align your packet to the scope and respond to plan check comments if they request additional documentation.

COMcheck & AHRI

COMcheck + AHRI: the RTU mismatch trap

COMcheck (when required)

Many commercial RTU replacements trigger COMcheck. The safe approach is to assume you may need it and confirm based on scope/AHJ.

COMcheck Houston

AHRI certificates

AHRI supports efficiency and matched system claims. If the AHRI doesn’t match the model numbers in your packet, expect a kickback.

How FlashPermit works

Submit. Pay. We file and handle plan check.

Step 1

Intake

Address/suite, scope, curb details, model numbers, photos.

Step 2

Packet build

COMcheck/AHRI alignment, formatting, submission-ready.

Step 3

iPermits submit

Upload + respond to plan check comments until approval.

We target submission within ~48 hours after receiving complete information. City review time varies.

Ready to file your Houston RTU permit?

Submit your RTU job details and we’ll confirm scope + pricing. Commercial HVAC only.

Submit an RTU Job See Pricing

Tip: have model numbers, tonnage, curb status, and the job address + suite ready.

FAQ

Common RTU permit questions

Often, yes—especially for commercial RTU replacements. Requirements depend on scope and the authority having jurisdiction (AHJ). If you’re unsure, treat it as a permit scope until confirmed.
COMcheck is commonly required for commercial replacements affecting energy compliance, and many RTU swaps trigger it. Exact triggers vary by scope and AHJ.
Mismatched model numbers across the application, AHRI certificates, and COMcheck (plus unsigned COMcheck PDFs). Alignment is everything.
Not always, but curb adapter/roof load/wind scenarios are common plan check comment areas. Requirements depend on scope and AHJ. If requested, we help you respond and resubmit.

Disclaimer: Informational only. Requirements may change; verify with AHJ for your scope.