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Whether a system changeout at your address is permitted and inspected, or permitted and inspected by nobody at all, depends entirely on which side of a city line the house sits on. Here is the position city by city, and what to do where there is no permit.
Fort Bend County’s own building-codes page says it in one sentence: “Fort Bend County has not adopted zoning ordinances and does not issue Certificates Of Occupancy.” The page immediately goes on to note the exception — the county has adopted a county fire code, and the Fire Marshal’s office issues Certificates of Compliance for certain multi-family and non-residential developments — and that exception is worth carrying with the quote, because it is the part people get wrong in both directions.
A county verification letter puts the residential position beyond argument: “the County has not adopted building codes for single family residential developments.”
The county’s own list of what does require a permit in unincorporated areas is short and specific: floodplain work; a fully enclosed structure or concrete slab of 400 square feet or more; development of real estate; fill or excavation above 500 cubic yards per acre or an elevation change of six inches or more; a driveway connection to a county road; a turn lane or median opening; and utility work in the right of way. There is no mechanical trigger on that list. A like-for-like system changeout creates no new enclosed structure and no new slab, so it trips none of them.
The practical answer, then: replacing an entire heating and cooling system on an unincorporated Fort Bend County house involves no county mechanical permit and no county mechanical inspection. A 2016 H-GAC profile put around 60% of the county’s population in unincorporated areas — a decade-old figure, and annexation since means the current share is likely lower, but the order of magnitude is the point. A large part of this county’s equipment was installed with nothing external checking it.
A common assumption is that a house inside a city’s extraterritorial jurisdiction falls under that city’s codes. It does not, and there is settled Texas law on the point.
In Town of Lakewood Village v. Bizios (Tex. 2016) the Texas Supreme Court held that a Type A general-law municipality has no authority to enforce its building codes or building-permit requirements within its ETJ. Two years later, in Collin County v. City of McKinney (Tex. App.—Dallas 2018), the Dallas Court of Appeals extended the reasoning: every municipality, home-rule ones included, needs legislative authorization to enforce building codes beyond its corporate limits, and none has it. Cities do retain platting authority in the ETJ, which is why subdivisions out there still go through city plat review — and why the two things are easy to confuse.
So a house in Cinco Ranch, Aliana, Harvest Green or Jordan Ranch sits under unincorporated-county rules for mechanical work, whatever the mailing address on the envelope says. The mailing city is a postal routing decision. It is not a jurisdiction.
Checked against each city’s own published information in August 2026. Where something could not be verified it is marked as such rather than guessed — a wrong permit claim is worse than no claim. Confirm your own address before relying on any row of this table; cities adopt new code cycles and change registration rules without announcing it widely.
| Jurisdiction | Mechanical permit | Contractor registration | Code edition | Notes |
|---|---|---|---|---|
| Unincorporated Fort Bend County | No | No | None adopted for single-family residential | The county has not adopted zoning ordinances, does not issue certificates of occupancy, and has no mechanical trigger on its permit list. |
| Missouri City | Yes | Yes — $105/yr | 2021 IBC, IFC, IMC, IPC, IECC, IFGC; 2023 NEC | Mechanical contractors must register with the city and carry stated insurance minimums. Registrations expire 30 September. Permits & Inspections: 281-403-8600. |
| Sugar Land | Yes | Not published | 2024 IBC, IRC, IFC, IPC, IMC, IECC and IPMC; 2023 NEC, under Ordinance 2395 | The county’s largest city. The 2024 codes took effect 21 January 2026; applications filed before that date are still reviewed and inspected under the 2021 codes. Permits & Inspections: (281) 275-2270. Sugar Land page. |
| Richmond | Implied by code adoption | Program exists | 2024 IBC, IRC, IPC, IMC, IECC, IFGC, IFC; 2023 NEC | The most current code cycle in the county. The building department page lists the editions but does not spell out HVAC permit requirements in text. (281) 232-6871. |
| Rosenberg | An HVAC permit application is published | Not verified | Not verified | The city publishes an HVAC permit application, so permits are clearly issued, but the site could not be read to confirm the code edition. Check with the city: 832-595-3500. |
| Stafford | Not listed — check | Yes | 2015 ICC codes; 2017 NEC | Adopted by Ordinance 1110, effective 3 May 2018, enforced from 2 October 2018. Contractor registration is listed among the city's permits; a mechanical permit is not, so confirm before assuming. |
| Fulshear | Yes — “Trade Permit (HVAC, Lawn, Plumbing)” | Registration record kept | 2015 International Codes; 2014 NEC; 2015 IECC | Applications go through the city's online portal. (281) 346-1796. |
| Needville | Yes — Mechanical Permit | Form exists | “2025 updated codes” — editions not published | Cash, check or money order only — no cards. Inspections Tuesday to Friday only. Residential turnaround 2–3 business days. (979) 793-4253. |
| Meadows Place | Yes — explicitly for AC and heaters | Yes, with master license and insurance | 2015 IBC, IMC, IRC; 2014 NEC | Plan review and inspections are contracted to a third-party building official. 281-983-2932. |
| Beasley | Yes — Mechanical Permit | Form exists | Ordinance 2023-5 — editions not published | A small city running its own permit program. (979) 387-2775. |
| Simonton | Building permits required for all construction | Not verified | Builds to 2021 IRC | Floodplain development permits are also required across much of the city. Confirm whether a like-for-like changeout is included. |
| Orchard | No mechanical permit listed | Not verified | Not published | Residential and commercial permit applications are published; no separate mechanical permit appears among them. (979) 478-6893. |
| Weston Lakes | Development / floodplain permit only | No city program found | None published | The city directs residents to the property owners association for its requirements and to the county for septic and wells. |
| Kendleton, Pleak, Fairchilds, Arcola | Not verified | Not verified | Not published | Each has some permitting function. None publishes enough detail to state a mechanical requirement. Call before assuming either way. |
This is the part that makes the gap matter, rather than making it merely interesting. The things a mechanical inspection catches are, almost without exception, things a homeowner will never see and will never find out about until the system dies early.
The single most common Gulf Coast install error. An oversized system blows cold air on day one and then short-cycles for fifteen years, never dehumidifying and wearing out early. Both the IRC (M1401.3) and the IECC (R403.7) require sizing from a calculated load. The detail.
Invisible from the hallway, and it caps what the equipment can ever deliver. One central return for a house that needed three is not a fault that announces itself.
Auxiliary pan, secondary drain line, float switch. In a slab-on-grade house all of it sits above a finished ceiling, and the first sign that it was done badly is a stain in a bedroom.
A number that takes two minutes to measure and that nobody measures. High static means new equipment will never deliver its rating. The detail.
None of those stops the system working on the day it is commissioned. All of them decide how it behaves for the following decade. That is precisely why the permit process is the wrong thing to rely on emotionally and the right thing to understand practically: inside a city the inspection is a backstop, and outside one, the load calculation is the only backstop there is.
This is the distinction that matters most and the one most easily lost. Air conditioning and refrigeration contracting is licensed by the Texas Department of Licensing and Regulation across the entire state. Occupations Code §1302.251 bars a person from performing — or offering to perform — that work without a license, and the requirement does not care in the slightest whether the property is inside a city or in unincorporated county.
What changes between the two is enforcement. Inside a city, pulling a permit is the moment somebody checks that the person doing the work holds the license they say they hold; several Fort Bend cities go further and require the contractor to be registered with the city, with insurance, before a permit can be issued at all. In unincorporated county there is no such moment, so enforcement is effectively complaint-driven — which in practice means it happens after something has gone wrong.
That is the honest reason to care who you hire out here, and it is a much better reason than any scare story. Ask for the company’s TACL number and check it against TDLR’s public license search, which is free and takes about a minute. A license belongs to a company and to a named individual; the question is not “are you licensed” in the abstract but “what is the company’s TACL number, and is your name on it.”
Four documents. None of them is unusual, all of them are ordinary deliverables for a contractor who works this way, and together they are a reasonable substitute for the inspection that is not going to happen.
1. The load calculation. ACCA Manual J, with your address on it and a separate sensible and latent figure. Ask for a copy with the quote rather than asking whether one was done.
2. A static pressure reading. Taken across the air handler, before and ideally after. It takes minutes and it is the closest thing available to independent evidence about the duct system.
3. The commissioning numbers. Refrigerant charge verified by superheat or subcooling, supply and return temperatures, and airflow. A system left at “it’s cold, isn’t it” has not been commissioned, it has been switched on.
4. The license number and both warranties. The company’s TACL number, the manufacturer’s parts warranty with its registration deadline, and the contractor’s labor warranty, which is a separate document with separate terms.
A contractor who produces those four things without friction is telling you something useful about how the rest of the job will go.
It depends on which side of a city line the property sits. In unincorporated Fort Bend County there is no county mechanical permit and no county mechanical inspection, because the county has not adopted building codes for single-family residential development and its permit list contains no mechanical trigger. Inside Missouri City, Needville, Meadows Place or Beasley there is a mechanical permit, and Richmond, Rosenberg, Fulshear and Simonton all operate permit programs. Confirm your own address before assuming.
No. A mailing address is a postal routing decision by USPS and carries no jurisdictional meaning at all. Aliana and Harvest Green both have Richmond mailing addresses and both sit in unincorporated Fort Bend County within Houston's extraterritorial jurisdiction, so no city mechanical code applies to either. The only reliable way to know is the actual jurisdiction of the parcel, not the envelope.
No, and this is settled Texas law. The Texas Supreme Court held in Town of Lakewood Village v. Bizios (2016) that a general-law city cannot enforce building codes or permit requirements in its ETJ, and the Dallas Court of Appeals extended the reasoning to home-rule cities in Collin County v. City of McKinney (2018): every municipality needs legislative authorization to enforce building codes beyond its corporate limits. Cities do keep platting authority in the ETJ, which is the source of most of the confusion.
Yes, everywhere in Texas without exception. Occupations Code §1302.251 bars performing or offering to perform air conditioning and refrigeration contracting without a TDLR license, and it applies identically inside a city and in unincorporated county. What differs is enforcement: inside a city, the permit is the moment somebody checks. Outside one, enforcement is effectively complaint-driven, which means it happens after the fact.
Four documents: the ACCA Manual J load calculation with your address on it, a total external static pressure reading taken across the air handler, the commissioning numbers (charge verified by superheat or subcooling, supply and return temperatures, airflow), and the company's TACL number alongside both warranties. All four are ordinary deliverables, and a contractor who produces them without friction is telling you something useful.
Yes, but nothing mechanical on a house. The Fire Marshal administers the 2021 International Fire Code with local amendments, adopted 26 September 2023 and effective 1 October 2023, but its scope is commercial, public and multi-family buildings of four or more units — not detached single-family. County Engineering permits floodplain work, driveway connections, subdivision platting, and enclosed structures or slabs of 400 square feet or more. Environmental Health regulates septic systems, and requires aerobic units to be under a maintenance contract with testing and reporting every four months.
Which permit, which code edition, and whether anyone inspects it are all address-level questions. Get connected with an independent, TDLR-licensed contractor who works across Fort Bend County.
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