Do You Need a Permit to Replace an AC in Greater Houston? City-by-City Guide

Published October 16, 2026 · Reviewed October 16, 2026

Part of our AC Installation & Replacement guides.

General guidance, not legal advice. Permit rules, fees and adopted codes change, and this page summarizes what each city published at the time of our review. Before any HVAC work begins, confirm the current requirements with the building department (or, outside city limits, the county) that has authority over your address.

What is an HVAC permit?

An HVAC permit, usually called a mechanical permit, is written approval from your local building department to install, replace or alter heating and air conditioning equipment, followed in most cases by an inspection of the finished work. The department that issues it is known as the authority having jurisdiction, or AHJ. In Greater Houston the AHJ depends on whether your home sits inside a city's limits or in an unincorporated area.

The permit and inspection process checks the installation against the code the jurisdiction has adopted, which can cover items such as equipment clearances, electrical disconnects, condensate drainage and venting for gas appliances.

A permit is the local building department's record that your new system was installed to code.

Do you need a permit to replace an AC in Greater Houston?

In most incorporated cities around Houston, yes: replacing an air conditioner, heat pump or furnace requires a mechanical permit from the city. The City of Houston, for example, requires a mechanical permit for HVAC alterations, including replacing a condensing unit, and the City of Sugar Land requires a permit for HVAC repair, replacement or addition.

Outside city limits the picture is different. In unincorporated communities such as Spring, Aldine, Cinco Ranch, Fresno and The Woodlands, no county residential mechanical permit was found in our research. That does not mean there is no standard: under Texas rule 16 TAC §75.100(e), where no local code has been adopted, air conditioning work on one- and two-family homes must still meet the applicable edition of the International Residential Code, along with the International Fuel Gas Code and the International Energy Conservation Code. Confirm with your county whether any permit applies to your address.

How do permit rules compare city by city?

Permit rules in Greater Houston differ by city in who issues the permit, which code applies and what fee is published. The table below lists only what each city's own published documents showed when we reviewed them on October 16, 2026. Where a cell says "confirm with the city," we did not find a published figure we could verify.

HVAC replacement permits by jurisdiction in Greater Houston (reviewed October 16, 2026; confirm current rules with each authority)

Jurisdiction	Permit office (AHJ)	What the published source says	Code basis	Published fee
City of Houston	Houston Permitting Center	Mechanical permit required for HVAC alterations, including condensing-unit replacement	Confirm with the city	Confirm with the city
City of Humble	City of Humble Building Department (Chief Building Official)	The city issues building and mechanical permits	Confirm with the city	Residential HVAC fee not confirmed; confirm with the city
City of Katy	City of Katy Permits	Permit required to install air conditioning or heating; contractors register with the city	Confirm with the city	Confirm with the city
City of Jersey Village	Jersey Village Building Safety and Permits	Mechanical permits are applied for through the city's Vertex Plans portal	Confirm with the city	Confirm with the city
City of Pasadena	Permit/Inspection Department, Mechanical Section	City issues mechanical permits	City form cites the 2024 Uniform Mechanical Code — confirm with the city	Confirm with the city
City of Pearland	Permits & Inspections	City issues residential mechanical permits	2021 International Mechanical Code	$60 residential mechanical permit
City of Sugar Land	Building Standards / Permits Division	Permit required for HVAC repair, replacement or addition	2024 International Codes	$115 replacement fee (FY25); doubled if work starts before the permit is issued
City of Missouri City	Permits & Inspections	City issues mechanical permits through a mechanical permit application	2021 International Residential Code and International Mechanical Code	$35 application fee
Unincorporated areas: Spring, Aldine, Cinco Ranch, Fresno, The Woodlands	County (Harris, Fort Bend or Montgomery, depending on address)	No county residential mechanical permit was found; the state code standard (16 TAC §75.100(e)) still applies — confirm with the county	International Residential Code, International Fuel Gas Code and International Energy Conservation Code (applicable editions) under 16 TAC §75.100(e)	Confirm with the county

Fort Bend County's Engineering Department issues development and floodplain permits in unincorporated areas; that is a different permit from an HVAC mechanical permit. Homes in The Woodlands also fall under the Township's residential covenants, which set rules for where outdoor units go and how they look; see our separate guide to The Woodlands AC replacement covenant rules.

When does an HVAC job typically need a permit?

An HVAC job typically needs a permit when it installs, replaces or adds equipment, or alters ductwork, gas piping or electrical connections; minor repairs are treated differently from city to city. Sugar Land, for example, lists HVAC repair as well as replacement; how other cities treat repairs varies, so check with yours. Jobs that commonly trigger a permit where one is required:

• Replacing an outdoor condenser or heat pump
• Replacing a furnace or air handler
• Installing a complete new system or adding a system
• Replacing or adding ductwork
• Changing gas piping or the electrical supply to equipment

Routine maintenance, filter changes and cleaning generally do not involve a permit. If you are unsure where your job falls, a short call to the city's permit office settles it.

What happens if work isn't permitted?

Work done without a required permit can create problems later, even if the system runs fine on day one. The general risks:

• Higher fees. Some cities charge more when work starts before a permit is issued. The City of Sugar Land, for example, doubles its permit fee in that case.
• Inspection findings. Without a city inspection, installation problems such as missing disconnects, poor drain routing or incorrect clearances may go unnoticed until they cause damage.
• Resale questions. A buyer's home inspector may flag recently replaced equipment, and buyers or their agents may ask for permit records.
• Insurance questions. If a claim involves the HVAC system, an insurer may ask whether the work was permitted and inspected.

Specific penalties beyond published fees vary by city, so ask your building department how it handles work started without a permit.

The cheapest time to deal with a permit is before the old unit comes out.

How can you check whether your job was permitted?

You can check permit status yourself through your city's permit office or its online portal. Practical steps:

1. Identify your AHJ: check whether your address is inside city limits or in an unincorporated area.
2. Before work starts, ask your contractor in writing whether a permit is required for your address and who will apply for it.
3. Ask for the permit number and look it up on the city's portal or by calling the permit office.
4. Keep a copy of the final inspection result with your equipment paperwork for warranty registration and resale.

Some cities let homeowners apply for their own permits; Sugar Land's homeowner brochure, for example, says a homeowner may act as their own contractor. Air conditioning contractors in Texas are licensed by the Texas Department of Licensing and Regulation (TDLR), and you can confirm a contractor's license on TDLR's website.

What should you do before replacing your system?

Before replacing a system, confirm who your permit authority is, what it requires and who will handle the application, then get those answers in writing with your quote. A short checklist:

• Confirm your AHJ and its current permit requirement.
• Ask what code edition the job will be installed to.
• Confirm who applies for the permit and schedules the inspection.
• In The Woodlands, check the Township's covenant rules too.
• Verify the contractor's TDLR license.

JHC Cooling & Heating is TDLR licensed (TACLA75082C). Ask any contractor you are considering, including us, how permits are handled for your specific address.

Frequently Asked Questions

Do I need a permit to replace my AC in Houston?

Yes. The Houston Permitting Center requires a mechanical permit for HVAC alterations, including replacing a condensing unit. Confirm current requirements and fees with the Houston Permitting Center before work begins.

Do I need a permit to replace an AC in Spring, TX?

Spring is an unincorporated community, so there is no city permit office. Our research found no Harris County residential mechanical permit, but Texas rule 16 TAC §75.100(e) still requires the work to meet the applicable International Residential Code. Confirm with Harris County for your address.

How much does an HVAC permit cost in Sugar Land?

The City of Sugar Land's FY25 fee schedule lists $115 for an HVAC replacement permit, and the fee is doubled if work starts before the permit is issued. Fees are updated each fiscal year, so confirm the current amount with the city.

Which mechanical code does Pasadena use?

The City of Pasadena's residential building application cites the 2024 Uniform Mechanical Code, while several nearby cities reference the International Mechanical Code. Confirm the current adopted code directly with the City of Pasadena.

Can a homeowner pull their own HVAC permit?

Some cities allow it; Sugar Land's homeowner brochure, for example, says a homeowner may act as their own contractor. Rules differ by city, so ask your city's permit office what it requires before you apply.

What happens if my AC was replaced without a permit?

It can lead to higher fees, such as Sugar Land's doubled fee for work started before a permit, plus questions during a home sale or an insurance claim. Contact your city's permit office to ask how to bring the work into compliance.

Sources

1. Houston Permitting Center, mechanical permits — mechanical permit required for HVAC alterations including condensing-unit replacement (as of October 16, 2026)
2. City of Humble, Fee Schedule effective October 1, 2024 — Building Department under the Chief Building Official (as of October 16, 2026)
3. City of Katy, Permits & Building — permit required for air conditioning and heating installation; contractor registration (as of October 16, 2026)
4. City of Jersey Village, Building Safety and Permits — mechanical permits via the Vertex Plans portal (as of October 16, 2026)
5. City of Pasadena, Residential Building Application — Mechanical Section; form cites the 2024 Uniform Mechanical Code (as of October 16, 2026)
6. City of Pearland, Permits & Development Fees — $60 residential mechanical permit fee (as of October 16, 2026)
7. City of Pearland, Adopted Building Codes — 2021 International Mechanical Code (as of October 16, 2026)
8. City of Sugar Land, Permits Homeowner Brochure, and FY25 Fee Ordinance — permit required for HVAC repair, replacement or addition; homeowner may act as own contractor; $115 replacement fee doubled if work starts first; 2024 International Codes (as of October 16, 2026)
9. City of Missouri City, Mechanical Permit Application — $35 application fee; 2021 IRC/IMC (as of October 16, 2026)
10. Harris County Engineering, permits — county permit pages reviewed; no county residential mechanical permit identified (as of October 16, 2026)
11. Fort Bend County Engineering, permits — development and floodplain permits in unincorporated areas (as of October 16, 2026)
12. Texas Department of Licensing and Regulation (TDLR) — state licensing of air conditioning and refrigeration contractors and license lookup (as of October 16, 2026)
13. 16 Tex. Admin. Code §75.100 (Cornell LII) — standard for air conditioning work where no local code has been adopted (as of October 16, 2026)