Are you inside Georgetown, in its ETJ, or in unincorporated Williamson County?
Outside them, no county building permit and no county building code. In between, the ETJ, where a city permit applies only if Georgetown is your utility provider. That utility test is water, wastewater or electric service, and it reaches new construction, plumbing and electrical work and utility connections. Williamson County has adopted no residential building code for the unincorporated county and inspects no houses, while in the ETJ the city still reviews subdivision, stormwater, utility evaluation, driveways and signs. Georgetown is the county seat, so both offices sit in the same town, and your address decides which one reads the plans. So the first question on a Georgetown tract is not who will build it. It is which of the three answers your address.
Inside the Georgetown city limits you are on the full city program: a permit before anyone builds, enlarges, alters, repairs, moves or demolishes a building, or changes what it is used for, and to work on electrical, gas, mechanical or plumbing systems. Its code is the 2021 International Residential Code, effective November 1, 2023.
In the ETJ the city regulates and reviews subdivision of land, stormwater, utility evaluation, driveway permits and sign permits. The catch is the utility test: Georgetown building permits do apply in the ETJ when the City is the water, wastewater or electric provider, covering new construction, plumbing and electrical work and utility connections. One ETJ tract on city water can need a city permit while the tract across the road does not.
Outside both, Williamson County speaks for itself. Texas counties have not been given general zoning authority, so the county issues no building permit except for health and safety issues and no certificate of occupancy, and it has not adopted the optional county residential building standards. No county code, no county inspection of houses. The Williamson County permit page and the six-county county-by-county permit page carry the rest.
City of Georgetown Development Services, When do I need a Permit?, as read September 13, 2026.
City of Georgetown Development Services, Adopted Building Code, as read September 13, 2026.
City of Georgetown Development Services, Extra-Territorial Jurisdiction (ETJ) and City Limits, as read September 13, 2026.
Texas Local Government Code Sec. 233.152, as read September 13, 2026.
Williamson County frequently asked questions, County Engineer, as read September 13, 2026.
Who permits a barndominium in Georgetown, TX outside the city limits?
The County Engineer, and the first paper is a Certificate of Compliance. Williamson County requires it before a new home goes up. It is the floodplain check, and it has to be processed before the county will take a septic application. A lot in a recorded subdivision may already carry one in its plat notes, so read the plat before you apply twice.
Septic runs through the same office, the County Engineer's on-site sewage facility program, and applications go through the county's online portal only. Williamson County is the single authorized agent for on-site sewage in the county: no city and no special district holds a separate authorization, and the Lower Colorado River Authority, an authorized agent in Travis, Burnet and Llano counties, does not appear here at all. A permit is needed before anyone builds, installs, alters, extends or repairs a system. The septic permit guide walks the application.
Driveways go to the Williamson County Road and Bridge Division on a county driveway permit, required for a new or modified driveway onto a county-maintained road, with the county sizing the culvert. A 911 address from county GIS and Addressing has to exist before a county permit application, so start there.
TCEQ OARS county search, Williamson County (CNTY_CD 246), as read September 13, 2026.
TCEQ OARS county search, identical entry returned for Travis, Burnet and Llano counties, as read September 13, 2026.
TCEQ, Getting a Permit for an On-Site Sewage Facility, as read September 13, 2026.
Williamson County frequently asked questions, County Engineer, as read September 13, 2026.
Does anyone inspect a barndominium build on an unincorporated Georgetown lot?
No public inspector does, so the inspections you get are the ones you write into the contract. Texas issues no state license for general contracting, and the Texas Residential Construction Commission no longer exists: it was abolished, and its enabling Act lapsed on September 1, 2009. Every builder you talk to is an independent builder, and local city or county requirements can still apply on top.
The state lets counties adopt residential building standards, but it is opt-in and Williamson County has not opted in. In a county that has, a new house on a vacant lot takes at least three inspections, foundation before concrete, framing and mechanical before drywall, and one on completion, contracted by the builder rather than the county. Nothing stops you from writing that schedule into your own contract. Two trades stay licensed wherever the lot sits: plumbers by way of the Texas State Board of Plumbing Examiners, electricians by way of TDLR, both with public lookups, and non-exempt electrical work must run through a licensed electrical contractor. The wider sequence is in building a barndominium in Central Texas.
Office of the Texas Governor, Business Permit Office, Texas Business Licenses and Permits Guide, as read September 13, 2026.
Texas Sunset Advisory Commission, as read September 13, 2026.
Texas Local Government Code Sec. 233.152, as read September 13, 2026.
Texas Local Government Code Sec. 233.154(a)(1), as read September 13, 2026.
Texas Local Government Code Sec. 233.154(a)(3), as read September 13, 2026.
Texas State Board of Plumbing Examiners, as read September 13, 2026.
Texas State Board of Plumbing Examiners, as read September 13, 2026.
Texas Department of Licensing and Regulation, Electricians program, as read September 13, 2026.
Texas Department of Licensing and Regulation, as read September 13, 2026.
Williamson County frequently asked questions, County Engineer, as read September 13, 2026.
What is under a Georgetown barndominium lot?
Nobody official will tell you, so this is the question to push hardest. Two very different grounds run through Central Texas. The Edwards Plateau is limestone country: shallow soils underlain by limestone, many springs, stony hills and steep canyons. The Blackland Prairies are named for deep, fertile black soils, gently rolling to nearly level at 300 to 800 feet. The black soil is the one that moves. Houston Black soil cracks half an inch to four inches wide from the surface down 12 inches or more when it dries, the shrink-swell behavior a slab has to be designed against. It formed in clayey residuum weathered from calcareous mudstone of Upper Cretaceous age, mainly on 1 to 3 percent slopes.
Faulting along the Balcones Fault Zone followed the uplift of the Edwards Plateau, and streams crossing that zone recharge the aquifer where permeability is enhanced by dissolution of limestone. The Edwards (Balcones Fault Zone) Aquifer and the Trinity Aquifer are both major Texas aquifers. Williamson County's surface water is the San Gabriel River, Lake Georgetown and Granger Lake. Because the county inspects no houses, no county file records which ground you bought: pay for the soil report and put the foundation question to the engineer who stamps the design.
Texas Parks and Wildlife Department, Texas Ecoregions, as read September 13, 2026.
USDA NRCS, Official Series Description, Houston Black Series, as read September 13, 2026.
USGS, Karst Aquifers: Edwards Balcones Fault Zone Aquifer, as read September 13, 2026.
Texas Water Development Board, as read September 13, 2026.
Texas Water Development Board, as read September 13, 2026.
Williamson County frequently asked questions, County Engineer, as read September 13, 2026.
Is a Georgetown tract inside the Edwards Aquifer program?
Williamson County is one of the eight Texas counties the Edwards Aquifer Protection Program covers, so the zone question comes before the site work. In the Austin region the program covers Williamson, Travis and Hays counties out of the TCEQ Austin Regional Office, phone (512) 339-2929.
Two zones decide what you owe. The recharge zone is where the aquifer's rock layers surface, along with outcrops close by whose caves, sinkholes, faults or fractures could let surface water in. The contributing zone is the watershed upgradient of it, and in Williamson County the rule draws it by exception: all areas except the watersheds draining to the Lampasas River above Stillhouse Hollow dam. Check the parcel on the TCEQ Edwards Aquifer Map Viewer, print the map for the file, and ask the Austin Regional Office to confirm the zone.
In the contributing zone, the Contributing Zone Plan kicks in when work disturbs five or more acres of ground or is part of a larger plan to develop or sell land. Below that, no aquifer plan is needed. On the recharge zone there is no acreage floor: any regulated activity must have its Water Pollution Abatement Plan approved before construction, and a site straddling the two is treated as recharge zone entirely. Administrative review can last as long as 30 days, technical review of an administratively complete application 90 days, and construction cannot begin until approval issues. A single-family residence may not need its own plan if it sits inside a master-planned community that already has an approved plan, or on more than five acres as the lot's single residence, or caps impervious cover at 20 percent or less. One county rule rides on top: only a registered sanitarian or a professional engineer may design a septic system over the recharge zone.
TCEQ GIS metadata, Edwards Aquifer Recharge Zone - Chapter 213 Rules (TSMS), quoting 30 TAC 213.3(8), as read September 13, 2026.
TCEQ Edwards Aquifer Protection Program home page, as read September 13, 2026.
TCEQ GIS metadata, quoting 30 TAC 213.3(25), as read September 13, 2026.
TCEQ GIS metadata, quoting 30 TAC 213.22(2), as read September 13, 2026.
TCEQ, Contributing Zone Plan page, as read September 13, 2026.
TCEQ, Edwards Aquifer Protection Program: What Plans You Might Need, as read September 13, 2026.
TCEQ, Water Pollution Abatement Plan page, as read September 13, 2026.
TCEQ, What Plans You Might Need, recharge zone branch, as read September 13, 2026.
TCEQ, What Plans You Might Need, contributing zone branch, as read September 13, 2026.
TCEQ, Edwards Aquifer Private Residences page, as read September 13, 2026.
TCEQ, Edwards Aquifer Map Viewer page, as read September 13, 2026.
Williamson County frequently asked questions, County Engineer, as read September 13, 2026.
Is the lot in or beside the 100-year floodplain?
The Certificate of Compliance is where that gets answered. Williamson County requires a floodplain development permit in or next to the 100-year floodplain, the structure sits at least a foot above the base flood elevation, and a surveyor files a FEMA elevation certificate twice, after the slab and again at completion.
Federal rules run the same direction. A permit is required before construction or development begins inside any Special Flood Hazard Area, and the floodplain administrator is responsible for seeing that development complies and that permits are applied for. Land surveyors, architects and engineers authorized by law certify the Elevation Certificate, which sets the flood insurance premium rate and documents elevation for compliance. Check the address on the FEMA Flood Map Service Center. Work disturbing one acre or more, or forming part of a larger common development plan that will, needs construction stormwater permit TXR150000; under one acre, no coverage is required.
FEMA glossary, Permit for Floodplain Development, as read September 13, 2026.
FEMA, NFIP Floodplain Management Requirements study guide, Unit 7, as read September 13, 2026.
FEMA 467-1, Floodplain Management Bulletin: Elevation Certificate, as read September 13, 2026.
FEMA, Elevation Certificate FAQ, October 2023, as read September 13, 2026.
FEMA Flood Map Service Center, as read September 13, 2026.
TCEQ, Stormwater Discharges from Construction Activities: Am I Regulated?, as read September 13, 2026.
Williamson County frequently asked questions, County Engineer, as read September 13, 2026.
What should you settle before you call barndominium builders in Georgetown, TX?
The sequence, and it is fixed. On an unincorporated tract it runs: 911 address from county GIS and Addressing, then the Certificate of Compliance from the County Engineer, then the septic permit, with the Road and Bridge driveway permit alongside. The Certificate has to be processed first, so an out-of-order packet just waits.
Then the utility question, which is specific to this city. A Georgetown building permit reaches into the ETJ when the City is the water, wastewater or electric provider, so two neighboring ETJ tracts can land on opposite sides of the permit line. Get the provider in writing early, because it sets your reviewer and your code. Liberty Hill, also in Williamson County, runs its own program: a permit for any building work that alters a structure or adds a new one on the property, expiring after 180 days unless construction continues or an extension is granted, and no city building permit in its ETJ unless a development agreement is in place. See the Liberty Hill page if the tract sits that way.
Only then does price mean anything, because the lot work sets it as much as the building does. The barndominium cost page lays out how Central Texas builds are quoted. To compare independent builders, start at turnkey barndominium construction.
City of Georgetown Development Services, When do I need a Permit?, as read September 13, 2026.
City of Liberty Hill, Building Permits and Inspections, as read September 13, 2026.
City of Liberty Hill, Frequently Asked Questions (Planning and Development), as read September 13, 2026.
Williamson County frequently asked questions, County Engineer, as read September 13, 2026.
Close by: Liberty Hill, Leander, Round Rock, Jarrell, Florence, Weir, Walburg. The whole county: Williamson County. The next town along: Liberty Hill.
Lot and permit questions near Georgetown
Do I need a Georgetown building permit if my land is outside the city limits?
Not automatically. Outside the limits Williamson County issues no building permit and has adopted no county building code. But a Georgetown building permit does apply in the ETJ when the City is the water, wastewater or electric provider, covering new construction, plumbing and electrical work and utility connections. Confirm your utility provider with the City before you assume the county is your only reviewer.
Who issues the septic permit for a barndominium near Georgetown?
The Williamson County Engineer's office, through the county's on-site sewage facility program, with applications going through the county's online portal only. Williamson County holds septic authority alone across the whole county, and the Lower Colorado River Authority is not an authorized agent here. The Certificate of Compliance has to be processed before the septic application is taken.
Does a barndominium builder in Texas have to be licensed?
No. Texas issues no state license for general contracting, and the Texas Residential Construction Commission no longer exists: it was abolished, and its enabling Act lapsed on September 1, 2009. Builders are independent, though local city or county requirements can still apply. Plumbers hold state licenses from the Texas State Board of Plumbing Examiners, electricians hold theirs from TDLR, and both have public license lookups.
How long does Edwards Aquifer review take in Williamson County?
Administrative review can last as long as 30 days and technical review of an administratively complete application takes 90 days, and construction cannot begin until approval issues. In the contributing zone a plan is triggered once five acres of ground are disturbed or when the work is part of a larger plan to develop or sell land. On the recharge zone there is no acreage floor.
What does the Williamson County Certificate of Compliance do?
It is the county's floodplain check, and Williamson County requires it from the County Engineer before a new home goes up. It has to be processed before the county will take your septic application. A lot in a recorded subdivision may already carry one in its plat notes, so read the plat first. In or next to the 100-year floodplain a floodplain development permit follows, the structure sits at least a foot above the base flood elevation, and a surveyor files a FEMA elevation certificate after the slab pour and again at completion.
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