Most rural Central Texas counties do not require a building permit for a barndominium outside city limits — including unincorporated areas of McLennan, Limestone, Falls, Freestone, and Navarro Counties. However, septic permits, electrical inspections, and floodplain reviews are required statewide, and any build inside a city’s ETJ or city limits requires full municipal permits.
One of the first questions every Texas landowner asks is: do I need a permit to build a barndominium? The honest answer is “it depends on which county and which side of the city limit line you’re on” — and that distinction can be the difference between a 30-day approval and a 12-month process.
At Heart of Texas Construction, we’ve pulled permits (or confirmed that no permit was required) in dozens of Central Texas counties. This guide breaks down the actual rules for the counties we build in most.
Short Answer
Most rural Central Texas counties do not require a structural building permit for a residential barndominium on unincorporated land. However, you’ll still need:
- A septic system (OSSF) permit from your county or designated representative
- Electrical inspection (if connecting to utility power)
- Floodplain development permit (if any portion sits in a FEMA-mapped floodplain)
- Driveway/culvert permit if accessing a county road
- Full municipal permits if your land is inside city limits or a city’s ETJ (extraterritorial jurisdiction)
Texas Doesn’t Have a Statewide Residential Building Code
Unlike most states, Texas does not have a uniform statewide residential building code for unincorporated areas. Under Local Government Code Chapter 233, counties have limited authority to regulate building construction outside of cities. That’s why Texas became one of the easiest states in the country to build a barndominium.
This changes the moment you cross into city limits or a city’s ETJ, where municipal codes — usually based on the International Residential Code — apply in full.
County-by-County: Central Texas Barndominium Permit Rules
McLennan County (Waco area)
- Outside city limits/ETJ: No structural permit required.
- Septic: Permit required through McLennan County Environmental Health.
- Floodplain: Required if applicable; administered by McLennan County.
- Inside Waco city limits or ETJ: Full IRC-based permitting through the City of Waco. Barndominiums must meet residential code as a “Type V-B” structure.
Limestone County (Mexia, Groesbeck)
- Outside city limits: No structural permit. Limestone is one of the friendliest counties in Central Texas for barndominium builds.
- Septic: Permit through Limestone County Environmental Office.
- Address assignment: Required for new builds.
Bell County (Temple, Killeen, Belton)
- Outside city limits/ETJ: No structural permit.
- Septic: Permit through Bell County Public Health District.
- Inside Temple, Killeen, or Belton city limits: Full city permits required. Killeen has additional military overlay considerations near Fort Cavazos.
Brazos County (Bryan, College Station)
- Outside city limits/ETJ: No structural permit.
- Septic: Brazos County Health Department.
- Inside Bryan or College Station: Full permits — College Station has notably stricter setback and aesthetic standards than Bryan.
Falls, Freestone, Navarro, Hill, Robertson Counties
- Structural permit: Not required outside city limits.
- Septic and floodplain: Required as applicable.
- These are some of the most permit-friendly rural counties for barndominium builds in Texas.
Travis County (Austin area)
- Travis is the strictest county in Central Texas. The county enforces additional development regulations even outside Austin’s city limits, including stormwater controls, septic restrictions in the Edwards Aquifer recharge zone, and aesthetic standards in some areas.
- Expect a 60–120 day permit process for builds inside Austin’s ETJ.
Permits You Always Need (Statewide)
Septic / OSSF Permit
If your build won’t connect to a municipal sewer line, you need an On-Site Sewage Facility permit from your county or its designated representative. Regulated by the Texas Commission on Environmental Quality. Plan for $300–$800 in permit fees plus $8,000–$14,000 in system installation.
Electrical Inspection
Most utility cooperatives (Bluebonnet, Heart of Texas Electric, Navasota Valley) require a state-licensed electrical inspector to sign off before they’ll energize the meter. This applies even in counties with no building permit.
Floodplain Development Permit
If any part of your build sits within a FEMA Special Flood Hazard Area, a floodplain development permit is required regardless of county building code status. Check your parcel on the FEMA Flood Map Service Center.
Driveway/Culvert Permit
If your build requires a new driveway connecting to a county road or state highway, you’ll need a culvert/driveway permit from the county precinct office or TxDOT.
Can You Build a Barndominium on Raw Land in Texas?
Yes, in most cases. On raw rural land in Central Texas, you can typically:
- Close on the land (verify no deed restrictions limit metal homes)
- Drill a well or arrange water service
- Permit and install septic
- Run electrical service to the site
- Begin construction
The biggest gotcha is deed restrictions. Subdivisions and some larger ranch tracts have private deed restrictions that override county freedom — they may prohibit metal-sided homes, limit minimum square footage, or require architectural review. Always pull the recorded restrictions before closing
Can You Get an Ag Exemption with a Barndominium?
Yes, but the agricultural exemption applies to the land, not the home. Your barndominium homestead acreage (typically 1 acre under and around the structure) is excluded from the ag valuation. The remaining acreage must meet your county appraisal district’s ag use requirements — usually defined cattle, hay, or wildlife management activity over five years. See your county appraisal district for specifics; rules vary materially between counties.
Frequently Asked Questions
Are barndominiums legal in Texas city limits?
Yes, as long as the structure meets the city’s residential building code. Many Central Texas cities (Waco, Temple, Bryan, Belton) now have explicit pathways for permitting barndominiums as IRC-compliant residences. College Station, Round Rock, and parts of Austin are stricter.
How long does it take to get a barndominium permit in Central Texas?
Counties without building codes: same-day to two weeks (septic only). Inside city limits: 4 to 12 weeks for plan review and permit issuance.
Do I need an engineered foundation?
If you’re inside city limits, almost always yes. Outside city limits, an engineered slab is still strongly recommended — Central Texas soils are highly expansive, and an engineered slab protects your investment and your insurability.
What about HOAs and deed restrictions?
HOA covenants supersede county freedom. Always check recorded deed restrictions before assuming you can build a metal home.
Get Help with the Permit Process
We handle permits and inspections as part of every turnkey contract. If you’ve already got land and you’re trying to figure out what your county requires, give us a call — we’ll tell you straight what you need before you spend a dollar on engineering or design. For more on our process, see our main barndominium services page.