Rolling Texas Hill Country limestone hills with live oak motts, Ashe juniper, and a clear creek over white limestone cobble.
Gillespie County No county building code

Barndominium Builders in Gillespie County, TX

Gillespie County is 1,058 square miles of Edwards Plateau limestone with one incorporated city in it. Fredericksburg holds 11,893 people; the other 16,634 live outside any city limit, which is where nearly every barndominium here goes. Out there Chapter 233 of the Local Government Code is the whole of a Texas county's authority over structures and it carries no general building-code subchapter, so no county plan review touches the house. That is not the same as no rules. The county gates development behind a free determination form, permits and inspects every septic system on any size tract, sets a six-acre floor on new well-served lots because the Hill Country is a Priority Groundwater Management Area, and regulates the floodplain. The ground is rock, not Blackland clay, so the foundation and the drainfield are different problems from the ones the I-35 corridor has.

Gillespie County at a glance

County
Gillespie County
Population
28,527
Where we build
Fredericksburg, Kerr County, Burnet County, Bandera County

ZIPs 78624, 78631, 78618, 78671, 78675

Site visits
We meet you on the tract, Fredericksburg or anywhere else in Gillespie County
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Building conditions in Gillespie County

What actually changes from one Texas jurisdiction to the next: who issues the permit, whether the residential code is enforced there at all, what the structure has to be engineered to, and what the ground is like. These are the numbers your drawings have to satisfy.

Build conditions for Gillespie County , Texas . BUILD CONDITIONS GILLESPIE COUNTY…Gillespie CountyNO COUNTY BUILDING…ADOPTED RESIDENTIAL CODENO COUNTY BUILDING…This jurisdiction publishes no design wind speed. It is settled in writing with the authority overyour parcel before the frame is ordered.ZONING ·6 acres per lot in a new subdivision…This is not zoning. Texas counties have no general zoning power, andLocal Government Code Sec. 233.153(d)(2) confirms that even an…WHO ISSUES THE PERMITGillespie County Engineering Departm…101 West Main Street, Room B-105, Fredericksburg, TX 78624. CountyEngineer and Floodplain Administrator: 830-307-6196,…
Build conditions for Gillespie County, drawn from the sourced facts on this page. Every figure above is cited in the quick-facts panel below, with its source and vintage.
Six acres, and the reason is water rather than zoning
Gillespie County's own words: the adopted minimum lot size for subdivisions served by well and septic is 6 acres per lot, with a maximum density of the parent tract divided by 8. The county's worked example is that 15 acres cannot be subdivided at all, and 30 acres yields at most 3 lots. The December 2024 amendment sets the manufactured home rental cap on the same basis, citing Texas Water Code Sec. 35.019 to protect, conserve, and manage groundwater resources in Gillespie County.

Gillespie County Engineering Department, Subdivision Regulations; and Subdivision and Manufactured Home Rental Community Regulations adopted 19 December 2022, Exhibit 1 amendment effective 23 December 2024, revising Art. 4 Sec. 4.1(L)(4)(d)

The first county form is free, and the septic permit waits behind it
The Engineering Department requires a Development Determination Form before development of a property, including new construction, grading and paving. It carries no review fee. Staff then return it either marked as needing nothing further, or with a Development Permit application attached. The form's own checklist is what releases the rest: it records whether a Development Permit, a Right-of-Way Permit, a Subdivision Plat Application or a Manufactured Home Rental Community Application is required, whether City of Fredericksburg review is required, and whether the project is released to the OSSF Department for permitting.

Gillespie County Engineering Department, Floodplain Development Regulations; and Gillespie County Development Determination Form

Ten acres buys you nothing here, in the county's own words
The belief that a ten-acre tract escapes the septic rules is wrong statewide, and Gillespie forecloses it by name. Its sewage order requires planning materials, application, permit, and inspection for construction, alteration, extension, or repairs of any OSSF, regardless of the size of the tract of land — with the stated justification that this ensures all systems are recorded and trackable on all properties, including ten acre or larger tracts.

Order Adopting Rules of Gillespie County, Texas for On-Site Sewage Facilities, effective 14 October 2025, Sec. 9(A), certified copy of the Gillespie County Clerk

The shop bay does not enlarge the drainfield in this county
Texas sizes a single-family septic system off bedrooms or the living area of the home, whichever gives the larger figure, so 1,800 square feet of three-bedroom living space beside a 2,200 square foot shop is a 300 gallon-per-day house rather than a 375. An authorised agent is allowed to be stricter, and some Texas counties redefine living area so that a loft or attached shop counts. Gillespie does not. Its order incorporates Chapter 285 by reference and then lists its own stricter requirements exhaustively at Section 9, and all three are about permitting and maintenance rather than how the house is measured.

TCEQ form TCEQ-0235 item 8 and 30 TAC Ch. 285 Table II, read with the Gillespie County OSSF Order effective 14 October 2025, Secs. 8 and 9

Not the Edwards Aquifer — but a Priority Groundwater Management Area
The Edwards Aquifer Protection Program, with its water pollution abatement plans, reaches Williamson, Travis, Hays, Comal, Bexar, Medina, Uvalde and Kinney counties. Gillespie is in none of them, so no Chapter 213 aquifer permit applies. What does apply is the Hill Country Priority Groundwater Management Area, declared over all of Bandera, Blanco, Gillespie, Kendall and Kerr counties and parts of four more. The county cites it directly: Gillespie County is part of a Priority Groundwater Management Area.

TCEQ, Edwards Aquifer Protection Program, and TCEQ, What is a Priority Groundwater Management Area; with the Gillespie County Engineering Department page

Letting it out changes three things, and none of them is a building code
Hotel occupancy tax applies from the first night: 13 percent on a house rented for fewer than 30 consecutive days, being 6 percent to the State and 7 percent to whichever of the county or the city the property sits in. Inside Fredericksburg a Short-Term Rental Permit is required under Section 20.222 of the Zoning Ordinance, with an inspection before a new permit issues and annually on renewal. The city states that short-term rentals in its extraterritorial jurisdiction are not required to obtain a permit to operate. And two or more spaces rented for movable dwellings — including RVs — is a Manufactured Home Rental Community needing County Engineer approval before construction starts.

Gillespie County Treasurer, County Hotel Occupancy Tax; City of Fredericksburg Short-Term Rental Permit FAQ and Zoning Ordinance Sec. 20.222; Gillespie County Subdivision and MHRC Regulations Art. 5

Also worth knowing before you build in Gillespie County

Fredericksburg is the county's only city, and 58 percent of people live outside it
Gillespie County's 2025 population estimate is 28,527 across 1,058 square miles. Fredericksburg accounts for 11,893 of that; the balance of the county is 16,634. It is the only incorporated place in the county, so beyond a one-mile extraterritorial ring there is no municipal building official anywhere in Gillespie County at all.

U.S. Census Bureau sub-county population estimates sub-est2025 and county estimates co-est2025-alldata, with the 2024 Census Gazetteer county file; ETJ distance per Texas Local Government Code Sec. 42.021(a)

Inside the city it is the 2021 codes
The City of Fredericksburg publishes its currently adopted building codes as the 2021 International Building Code, 2021 International Residential Code, 2021 International Plumbing Code, 2021 International Mechanical Code, 2020 National Electric Code and 2021 International Energy Conservation Code. The city's Building Division reviews plans for all properties within the city and performs the inspections. There is no statewide answer in Texas, and a tract a mile outside that line is under none of it.

City of Fredericksburg Development Services, Building Division, Adopted Codes and Ordinances

Forty percent hard surface can put an engineer on a tract with no building code
Gillespie County's flood ordinance regulates outside the flood hazard area as well as inside it. Development of a tract wholly within Zone X with total impervious cover of 40 percent or greater must reduce post-development peak flows, water surface elevations and flow velocity to pre-development rates for the 5, 10, 50 and 100-year storm events at all points of discharge, with an engineer providing construction plans and a drainage study certifying it. A house within 100 feet of the flood hazard area needs an elevation certificate even in Zone X.

Gillespie County Flood Damage Prevention Ordinance effective 28 July 2025, Sec. 3.3.1 and 3.3.5

One foot above the flood elevation, and double the fee if you start early
In Zone A or AE, new construction and substantial improvement of a residential structure must have the lowest floor elevated to at least one foot above the base flood elevation. The county's administrative fee for a floodplain development permit is $100 plus actual third-party review cost — and if construction has started before the permit is approved, the applicant pays the calculated fee twice over. The County Engineer is the Floodplain Administrator.

Gillespie County Flood Damage Prevention Ordinance effective 28 July 2025, Secs. 2.8, 2.11 Table 2-1 and 3.4.3

The county has no fire code, and says so in its own regulations
County fire-code power in Texas exists only for a county over 250,000 people or one adjacent to such a county, and Gillespie is neither. Its subdivision regulations legislate around the gap in terms: in areas that lack a nationally recognized fire code as described in Secs. 233.061 to .062 of the Texas Local Government Code, and that also lack water lines sized for fire protection, set-backs from roads and rights-of-way shall be a minimum of 10 feet and set-backs from adjacent property lines a minimum of 5 feet.

Texas Local Government Code Sec. 233.061(a), and Gillespie County Subdivision and MHRC Regulations, road and utility standards item 18

You may not service your own aerobic system
Where thin soil over rock pushes a site to an aerobic or spray system, Gillespie adds a running cost the state rule does not. Its order requires maintenance for the systems identified in Sec. 285.91(12) to be performed by a TCEQ registered maintenance technician or licensed maintenance provider and not the homeowner, and requires each maintenance report to include sludge levels in the pump tank and condition of the spray area.

Order Adopting Rules of Gillespie County, Texas for On-Site Sewage Facilities, effective 14 October 2025, Secs. 9(B) and 9(C)

A household well is registered; an irrigation or commercial well is permitted
The Hill Country Underground Water Conservation District covers Gillespie County from 508 South Washington Street in Fredericksburg. The district registers wells used solely for domestic and livestock purposes, and separately permits wells used for commercial, irrigation or municipal purposes, which are subject to district requirements on spacing and production limits. The county's own guidance adds that permitted wells must be set back from property lines and from other permitted wells.

Hill Country Underground Water Conservation District, Gillespie County Water Wells; and Gillespie County Development Requirement Information, revised September 2025

The plat, not the county, sets your setbacks
Gillespie County has no zoning, but it does impose building lines through platting. Pursuant to Sections 232.104 and 233.032 of the Texas Local Government Code, and for the promotion of the general welfare and safety of the public, its regulations require every plat to describe and depict a 20-foot building and set-back line on the front, sides, and rear of all lots in the subdivision. On a platted lot that is a real constraint on where a long metal building can sit.

Gillespie County Subdivision and MHRC Regulations Art. 4, Sec. 4.1(L)(N)

The utility connection is a gate of its own
Gillespie County has adopted the utility connection provisions of the Local Government Code. A utility may not serve or connect subdivided land with electricity or gas unless it receives a determination from the Commissioners Court that adequate water and sewer services, including septic or OSSF facilities, have been installed to service the lot or subdivision. On land with no building permit to withhold, that is where the practical leverage sits.

Gillespie County Subdivision and MHRC Regulations, Exhibit F, adopting Texas Local Government Code Secs. 232.028, 232.029, 232.101 and 232.106 to .107

The driveway is two different permits depending on the road
A permit is required to perform any construction in the right-of-way of a county road, including any driveway, construction entrance or other improvement, and it is issued by the County Commissioner or County Engineer. Where the property fronts a state highway the application goes to the TxDOT Fredericksburg office instead, at 1623 East Main Street — and the county notes that while there is no fee for the TxDOT permit, a permit is still required.

Gillespie County Development Requirement Information, revised September 2025; and Gillespie County Right-of-Way Regulations adopted 28 May 2024, amended 15 June 2026

Two statewide rules survive the absence of a county code
A licensed plumber is required on new construction even where nothing else is, because the rural exemption in the Texas plumbing licence law expressly excludes plumbing performed in conjunction with new construction. And a builder working outside the limits of any municipality must certify that the house complies with the state energy code and keep that certification for three years. Both apply on land with no permit and no inspector.

Texas Occupations Code Sec. 1301.052, and Texas Health and Safety Code Secs. 388.003(a) and 388.004

An excavator grading a compacted building pad on a cleared lot, with survey stakes and a drainage swale visible.
Below the slab

The expensive surprises are in the ground, not the building

What moves a Texas budget is usually below grade, and it is soil rather than rock: shrink-swell clay. The Blackland Prairie and the Gulf Coast clays move enough between a wet season and a dry one to drive the foundation design across the state's largest markets, which is why several DFW cities require an engineer's seal on the foundation of every new house. Those are the same conditions that decide whether a septic field passes its soil and site evaluation, so the grading plan, the foundation and the drainfield get resolved together rather than one at a time. We price the dirt before we price the building.

What we build in Gillespie County

All nine of our services — kits, custom plans, post-frame and steel construction, site preparation, permitting and engineering, through to turnkey builds — are available across Gillespie County. What a project costs depends far more on the parcel than on square footage, so we work from your land rather than from a rate card.

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What a build looks like

Three stages every Gillespie County project passes through, from a raw parcel to a finished home. Site work first, because that is where the budget is decided.

Aerial view of an undeveloped rural lot with cleared grass, a live oak and cedar elm treeline, and a pale gravel access track.
Stage one

The parcel

Zoning, setbacks, flood zone and utility access get checked before anything is drawn.

An excavator grading a compacted building pad on a cleared lot, with survey stakes and a drainage swale visible.
Stage two

Pad and permit

Clearing, grading and a compacted pad, while the submittal works through Gillespie County.

A finished barndominium at dusk with warm interior lighting glowing through its large windows.
Stage three

Frame to finish

Shell erected and dried in, then systems, insulation and interior finish through to CO.

Those are the rules for Gillespie County. Tell us what you want to build and we will draw it to them.

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Where we build around Gillespie County

Gillespie County and the rural land around it. The buildable acreage for a project this size usually sits outside the city limits, which is frequently what changes who issues your permit.

Our Gillespie County service area, covering Gillespie County and the surrounding rural acreage. This map marks the territory we serve, not a branch location.

Keep reading

The questions that usually come next once you know what Gillespie County allows.

Barndominium Cost Guide

Sourced per-square-foot ranges by tier and by size, with a calculator built on the same figures.

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Is It Legal in Texas?

Classification, zoning, the HOA gate, and why "nonresidential farm building" does not cover a home.

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How Long Does It Take?

Census build-duration data, and what actually sets the permit clock where you are building.

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Nearby areas we build in

Others we cover in this part of Texas. The permitting authority, the adopted design criteria and the zoning can all differ from one to the next.

Kerr County

Kerr County
Burnet County

Burnet County
Bandera County

Bandera County

Building in Gillespie County: common questions

7 questions we get asked most often about building in Gillespie County. If yours is not on the list, ask it directly.

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Do I need a building permit for a barndominium on unincorporated land in Gillespie County?
Not a building permit in the sense a city means it. Chapter 233 of the Local Government Code is the whole of a Texas county's authority over structures and it holds no general building-code subchapter, so there is no county plan review of a house and no county building inspector, and nothing in the county's published record shows an adopted residential code. What the county does require is a Development Determination Form before you start, which is free, and which tells you which of four county permits your project actually needs — a floodplain development permit, a right-of-way permit, a subdivision plat, or a manufactured home rental community application. Separately the county permits and inspects the septic system on any size tract. The commissioners court has never adopted an order or resolution under Chapter 233 Subchapter F, and that is established from the county’s own record rather than assumed. Had it done so, the subchapter would still allow no county permit, no county fee and no county inspector: the builder contracts the three required inspections privately. The county’s number is 830-307-6196.
How much land do I actually need in Gillespie County?
More than almost anywhere else in Texas, if the land has to be subdivided first. The county's adopted minimum for a new subdivision lot served by an individual well and septic is 6 acres, and the total number of lots is capped at the parent tract's acreage divided by eight. So a 15-acre tract cannot be split at all, and 30 acres yields at most three lots of at least 6 acres each. Those are the county's own worked examples. This is not zoning and it does not stop you building on an existing lot of record of any size — the state septic minimum of one acre on a private well still governs there. It bites when someone is carving a tract up, which is most of what is on the market. The reason is groundwater: the county amended the rule in December 2024 citing Texas Water Code Sec. 35.019, and the whole county sits in the Hill Country Priority Groundwater Management Area.
Is the ground here really different from the rest of Texas?
Yes, and it changes two things. The I-35 corridor and the Gulf Coast sit on shrink-swell clay, which is what removes the private-dwelling exemption from the engineering statute and hands a slab to a licensed engineer. Gillespie County is Edwards Plateau — limestone and granite, with thin soil over rock. That is a different foundation problem, generally a more stable bearing one, and the engineering question turns on what the site evaluation actually finds rather than on a regional assumption. It is a harder septic problem. Texas has no percolation test at all; a site evaluator or professional engineer classifies soil by texture into classes with a loading rate attached, and where there is not enough soil depth over rock the answer is often an engineered, aerobic or spray system rather than a conventional drainfield. Buy the site evaluation before the offer if you possibly can. It is the single item that decides whether a Hill Country tract works.
Is my land over the Edwards Aquifer recharge zone?
Not in Gillespie County. This catches people, because the Edwards Aquifer Protection Program is genuinely onerous and it is close by. TCEQ's programme reaches Williamson, Travis, Hays, Comal, Bexar, Medina, Uvalde and Kinney counties, and Gillespie is not among them, so there is no water pollution abatement plan and no Chapter 213 approval on a Gillespie parcel. What does apply is different: the Hill Country was declared a Priority Groundwater Management Area covering all of Bandera, Blanco, Gillespie, Kendall and Kerr counties, and the county regulates on that basis — the six-acre subdivision minimum is the visible result. If you are looking at tracts on both sides of the Kendall or Blanco county line, be aware the aquifer answer can change underneath you.
I want to rent it out on weekends. Does that change anything?
Three things, and none of them is a building code. First, hotel occupancy tax applies from the first night on any house let for fewer than 30 consecutive days: 13 percent in total, 6 percent to the State and 7 percent to the county if the property is outside Fredericksburg and its extraterritorial jurisdiction, or to the city if it is inside. Second, if the property is inside the city limits you need a Short-Term Rental Permit under Section 20.222 of the Zoning Ordinance, and there is an inspection before a new permit issues and again on each annual renewal — the city states that short-term rentals in its extraterritorial jurisdiction are not required to obtain a permit to operate, so that regime stops at a line. Third, if the plan is two or more rented spaces for anything movable — RVs, park models, cabins fabricated to be re-assembled — that is a Manufactured Home Rental Community and it needs County Engineer approval before construction begins, with a density cap and a road standard attached. Get the use settled before the plans are drawn, not after.
What is the actual order of operations?
First establish which side of the city line the tract is on, because inside Fredericksburg you are under the city's 2021 codes and its building official and the answer is completely different, and a one-mile extraterritorial ring around the city changes some of it again. Second, settle platting: if the tract needs subdividing, the six-acre and divided-by-eight rules decide whether the deal works at all, and there is an affidavit route for the exception where land is sold or exchanged with an adjoining owner. Third, file the Development Determination Form with the Engineering Department. It is free, it costs you nothing to be wrong, and its checklist is what releases the project to the septic department and tells you whether a floodplain permit is coming. Fourth, buy the site evaluation and apply for the septic permit. Fifth, the right-of-way permit for the driveway and the 911 address. Register the well with the Hill Country Underground Water Conservation District. And read the title commitment for recorded restrictions throughout, because in Texas those do the work zoning does elsewhere.
Everyone says the Hill Country has no rules. Is that right?
It is half right, and the half that is wrong is the expensive half. There is genuinely no county residential building code by default and no county inspector for a house. But the county gates development behind a determination form before you turn a shovel; it permits and inspects the septic system on any size tract and forbids the homeowner from maintaining an aerobic system; it caps new well-served subdivision lots at one per eight acres; it requires a 20-foot building line on every platted lot; it regulates development outside the flood hazard area as well as inside it, and a tract with 40 percent or more impervious cover needs an engineer's drainage study; and a utility may not connect electricity or gas to subdivided land until the Commissioners Court determines adequate water and sewer are installed. Add a licensed plumber on new construction, a state energy code certification outside any city, and recorded deed restrictions, and the picture is a long way from nothing.

Building in Gillespie County?

Start with the plan. Tell us what you want to build and we will draw it, then confirm what Gillespie County will actually let you put on the parcel and what wind load it has to meet. That conversation costs nothing.

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