Rolling Texas Hill Country limestone hills with live oak motts, Ashe juniper, and a clear creek over white limestone cobble.
Guadalupe County Edition set by the jurisdiction

Barndominium Builders in Guadalupe County, TX

Guadalupe County is the eastern edge of the San Antonio ring, and it does not read the same all the way across. Schertz, Cibolo and Selma in the west are commuter suburb; the buildable acreage is east and south of Seguin, out toward Kingsbury, Staples, McQueeney and New Berlin. Just over 49,000 people live outside every city limit here, across 711 square miles, and that number has barely moved in five years while the cities took every one of the county's new residents. What the county regulates is narrow. It permits and inspects every on-site sewage facility, and its own rules put the floor for a lot on septic at one acre whether or not you are on public water. It permits floodplain development along the Guadalupe River, with a manager who visits the site and issues a certificate at the end. What nobody at the county does is examine a house against a building code.

Guadalupe County at a glance

County
Guadalupe County
Population
201,111
Where we build
Seguin, New Braunfels, Comal County, Bexar County, San Antonio

ZIPs 78155, 78154, 78108, 78124, 78130, 78132, 78123, 78638 and more

Site visits
Site visits across Guadalupe County, from Seguin to the far side of the county
Start your project

Building conditions in Guadalupe 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 Guadalupe County , Texas . BUILD CONDITIONS GUADALUPE COUNTY…Guadalupe CountyEDITION PER JURISDI…ADOPTED RESIDENTIAL CODEEDITION PER JURISDI…This jurisdiction publishes no design wind speed. It is settled in writing with the authority overyour parcel before the frame is ordered.ZONING · NONE — A TEXAS COUNTY HAS NO POWER T…1.0 acre for any lot on septic, whet…Local Government Code Sec. 233.153(d)(2) says nothing in SubchapterF authorises a commissioners court to adopt or enforce zoning, and…PUBLISHED COUNTY PERMIT FEES$400 conventional residential septic…There is no county impact fee and no county building permit fee fora house. Sec. 233.153(f) bars a county from charging a fee to…WHO ISSUES THE PERMITGuadalupe County Environmental Health310 IH-10 West, Seguin, TX 78155. Phone (830) 303-8858, Monday toFriday 7:30am to 4:00pm. Septic permits permits@guadalupetx.gov,…
Build conditions for Guadalupe 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.
Who issues the septic permit depends on which line you are inside
TCEQ's authorized agent register returns five records for Guadalupe County. The county is the agent for the entire county except the City of Marion, and San Marcos, Seguin and New Braunfels each hold their own jurisdiction inside their city limits. No river authority appears in the county's records, despite the Guadalupe River running its whole length.

TCEQ Authorized Agent search (OARS), Guadalupe County, run September 2026

New Braunfels sits in two counties, and the aquifer rules differ across the line
The Census place-by-county file puts New Braunfels in Comal and Guadalupe counties only, with 27,476 of its residents on the Guadalupe side in 2025. TCEQ's Edwards Aquifer Protection Program covers Williamson, Travis, Hays, Comal, Bexar, Medina, Uvalde and Kinney counties: Comal is on that list and Guadalupe is not. The Edwards Aquifer Authority is a different body with a different map, and it covers portions of both.

U.S. Census Bureau 2020 place-by-county relationship file and sub-county estimates vintage 2025; TCEQ Edwards Aquifer Protection Program; Edwards Aquifer Authority jurisdictions page

A well-served lot needs one acre here and 5.01 acres in Comal County
Guadalupe County's subdivision regulations set a minimum lot size of 1.0 acre for any lot on septic — and the table reads 1.0 acre whether or not the lot is on a public water supply. Comal County's regulations, adopted 3 September 2020, read 1.0 acre on a public supply and 5.01 acres where the lots are not on one. Same metro, same house, sometimes across one road, and a five-fold difference in how much land you have to buy.

Guadalupe County Subdivision Regulations, amended 27 May 2025, Section IX.C; Comal County Subdivision Regulations, adopted 3 September 2020, Section IX.8

The septic application asks whether you intend to rent it out
Guadalupe County's on-site sewage facility application carries the line "Will this structure be used for rental?" immediately beside a field for a building permit number issued by the Fire Marshal. The county's fee schedule then prices a conventional residential application at $400, an advanced treatment residential application at $500, and a multi-unit, rental community, condominium or commercial application at $600. Answer that question before you design, not after.

Guadalupe County OSSF Development Application, revised August 2026; Guadalupe County Environmental Health Fee Schedule, approved 11 March 2025, revised 23 October 2025

A driveway permit and a 911 address come before the septic permit
The county's application checklist requires a copy of an issued driveway permit and a copy of an address assignment verification letter with every new septic application, along with the recorded deed and the recorded plat. Separately, the subdivision regulations bar the county from issuing a driveway permit for any lot abutting a county road that was created in violation of those regulations unless the owner has a variance plat approval.

Guadalupe County OSSF Application Checklist, revised 23 October 2025; Guadalupe County Subdivision Regulations, Section I.B

The county fire code stops short of a house
The Commissioners Court adopted the 2024 International Fire Code by order of 27 January 2026, effective 1 February, under Chapter 233 Subchapter C of the Local Government Code. It applies to commercial establishments, public buildings and multi-family dwellings of four or more units, it requires a permit and a certificate of compliance for those, and it expressly does not apply to an agricultural building used to shelter livestock or the tools and equipment essential to a farm or ranch.

Guadalupe County Commissioners Court Order Adopting a Fire Code, passed 27 January 2026

Also worth knowing before you build in Guadalupe County

The soil here fails at both ends
USDA soil survey data for Guadalupe County puts Vertisols — the shrink-swell clays, including Houston Black and Branyon — at 168,827 acres, the largest soil order in the county. The single largest map unit is not clay at all: Patilo and Arenosa soils cover 53,311 acres of deep, somewhat excessively drained sand. Clay needs an engineer on the foundation and a large drainfield; sand drains too fast to treat wastewater on its own.

USDA-NRCS SSURGO, soil survey area TX187 (Guadalupe County), via Soil Data Access

The ten-acre exemption gets you out of platting, not out of the acre
Guadalupe County's subdivision regulations carry the familiar exemptions — a division where every lot is more than ten acres, an agricultural-use division, a division among relatives within the third degree. But the section opens by saying that a property owner using one may not need a plat, and that the division of property must still meet the minimum lot size set out in the county's on-site sewage facility order. A county exception to the plat requirement also does not apply at all until the owner has submitted the form and received written approval from the Environmental Health Department.

Guadalupe County Subdivision Regulations, amended 27 May 2025, Section III

A house well is registered, not permitted
The Guadalupe County Groundwater Conservation District treats a domestic or livestock well incapable of producing more than 25,000 gallons a day as exempt from permitting — but it must still be registered, and a Notice of Intent to Drill has to be filed with the district before any well is drilled, regardless of exemption status, so that spacing and water rights can be checked. Non-exempt wells need a permit and proof of sufficient water rights.

Guadalupe County Environmental Health water wells page, citing District Rules 5.3 and 6.2 and Water Code Sec. 36.117; Guadalupe County Groundwater Conservation District, (830) 379-5969

A shared well serving four homes loses its exemption
Part of Guadalupe County lies inside the Edwards Aquifer Authority. For a well there to be recognised as exempt, the owner must register it, show it cannot produce more than 25,000 gallons a day, show it serves only domestic or livestock use, and show it does not serve a subdivision requiring platting — which the Authority defines as supplying more than three homes in a recorded subdivision.

Edwards Aquifer Authority, Well Registration and Updates

Two feet of freeboard, and an inspector who does turn up
The Guadalupe County Flood Damage Prevention Order requires two feet of freeboard above the base flood elevation. The floodplain manager visits the site before the permit issues, inspects through construction, can write a stop-work order, and issues a certificate of compliance at the end. Two elevation certificates are required, one at permitting and one at completion, by an engineer or surveyor. The application fee is $300, and no fill is allowed in the floodway without a No-Rise Certification sealed by an engineer.

Guadalupe County Environmental Health, Floodplain Development FAQ and Floodplain Development Permit Process

Outside a city limit but inside its ETJ, two offices split the job
Guadalupe County publishes thirteen interlocal agreements with cities under Chapter 242 of the Local Government Code. The Schertz agreement gives the city exclusive jurisdiction to regulate subdivision plats and approve related permits within its extraterritorial jurisdiction, and states that the county remains responsible for permitting floodplain development and septic systems there.

Interlocal Cooperation Agreement between the City of Schertz and Guadalupe County for Subdivision Regulation within the City's ETJ, published by Guadalupe County

A quarter of the county lives outside every city limit
49,295 of Guadalupe County's 201,111 residents lived outside every city limit in 2025, across 711 square miles — about 69 people per square mile counting all the county's land. That unincorporated population grew by 509 people in five years, while Seguin grew 39 percent and the county as a whole grew 15.8 percent. The growth went to the cities. The land did not move.

U.S. Census Bureau sub-county population estimates, vintage 2025, against the POPESTIMATE2020 base; 2024 Gazetteer county file for land area

The county says plainly that deed restrictions are the higher standard
Guadalupe County's code enforcement FAQ answers why it will not enforce a deed restriction: county orders and state laws generally establish a minimum standard required for health, safety and comfort, while deed restrictions generally establish a higher standard for a particular area. They are enforced by an HOA, or by one owner against another in civil court.

Guadalupe County Environmental Health, Code Enforcement Frequently Asked Questions

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 Guadalupe 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 Guadalupe 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.

See what we build

What a build looks like

Three stages every Guadalupe 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 Guadalupe 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 Guadalupe County. Tell us what you want to build and we will draw it to them.

Start your project

Where we build around Guadalupe County

Guadalupe 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 Guadalupe County service area, covering Guadalupe 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 Guadalupe County allows.

Barndominium Cost Guide

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

Read it

Is It Legal in Texas?

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

Read it

How Long Does It Take?

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

Read it

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.

New Braunfels

Comal County
Comal County

Comal County
Bexar County

Bexar County
San Antonio

Bexar County

Building in Guadalupe County: common questions

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

Start your project
Does Guadalupe County have a building code my barndominium has to meet?
Not one the county will check. Chapter 233 of the Local Government Code is the whole of a Texas county's authority over structures, and it contains no general building-code subchapter. Guadalupe County has used part of that chapter — it adopted a fire code under Subchapter C, most recently the 2024 International Fire Code by order of 27 January 2026 — but that order applies to commercial establishments, public buildings and multi-family dwellings of four or more units, and expressly not to agricultural buildings. Whether the commissioners court ever adopted a Subchapter F order setting residential building standards is a question for the county itself — ask the County Judge's office on (830) 303-8867 before you design. Either way there is no county building permit, no county fee and no county inspector for a one- or two-family house. Inside a city limit, that city's own code and building official apply instead.
So what do I actually need a permit for out there?
Three things, and they are all real. An on-site sewage facility permit from Guadalupe County Environmental Health, which involves a site and soil evaluation by a registered sanitarian, site evaluator or professional engineer, a decision within 30 days, a county site visit before the authorisation to construct issues, a construction inspection and a notice of approval before the system may serve the house. A floodplain development permit if any part of the work is in the regulated floodplain — which the county reads broadly enough to include grading, fill, a pool, a fence or a retaining wall. And plat compliance, which the county enforces at the driveway permit. Building without an issued permit doubles the fee.
How big does my lot have to be?
One acre if it is on septic. The county's subdivision regulations set that as the minimum lot size for a septic lot whether or not it is served by a public water system, which is stricter than the state rule allowing half an acre on a public supply, and any tract divided after 1 October 1997 has to meet it to get a septic permit. It is worth knowing what the neighbours do, because it is not the same: Comal County's regulations require 5.01 acres where the lots will not be on a public water supply. And this matters most if you are buying a piece cut off a larger tract, because the Guadalupe regulations say expressly that a division made under a plat exemption still has to meet the acre. Land can be lawfully divided into pieces that no septic permit will ever be issued for.
Does it change anything if I rent the barndominium out?
It changes what you are asked and possibly what you pay. Guadalupe County's septic application asks in terms whether the structure will be used for rental, on the same line as a field for a building permit number issued by the Fire Marshal, and the county's fee schedule prices a conventional residential application at $400 against $600 for a multi-unit, rental community, condominium or commercial application. Separately, the county's fire code reaches multi-family dwellings of four or more units. Nothing the county publishes says in terms that a single-family house that is let moves into the higher class, so the honest answer is that the county asks the question and Environmental Health on (830) 303-8858 is where to get it settled — before you design, not after you build.
I am looking at New Braunfels. Does it matter which county the lot is in?
Inside the city limits, much less than you would think: one city code applies across the whole municipality, and New Braunfels is its own septic authorised agent on both sides. Outside them it matters a great deal. TCEQ's Edwards Aquifer Protection Program names eight counties — Williamson, Travis, Hays, Comal, Bexar, Medina, Uvalde and Kinney — and Comal is on that list while Guadalupe is not, so a development plan approval a parcel needs on one side of the county line it does not need on the other. The Edwards Aquifer Authority is a different body with a different footprint and covers portions of both counties, so the well and water-rights question does not split the same way. And the land itself is priced differently by the rules: a lot on a private well needs 5.01 acres under Comal County's subdivision regulations and 1.0 acre under Guadalupe's.
Do I need a permit to drill a water well?
For a house, no — but you cannot just drill either. The Guadalupe County Groundwater Conservation District treats a domestic or livestock well that cannot produce more than 25,000 gallons a day as exempt from permitting, while still requiring it to be registered. And a Notice of Intent to Drill must be filed with the district before any well is drilled, exempt or not, so the district can check classification, spacing and water rights. Non-exempt wells need a permit, proof of sufficient water rights and possibly a board hearing. If your parcel falls inside the Edwards Aquifer Authority's area, its exempt-well test adds one more limb: the well must not serve more than three homes in a recorded subdivision.
Is this Hill Country limestone? What is the ground like?
No. Guadalupe County sits east of the Balcones Escarpment and there is no karst story here. USDA soil survey data for the county puts Vertisols — shrink-swell clays such as Houston Black and Branyon — at 168,827 acres, the largest soil order in the county, and that is the soil that puts a Texas-licensed engineer on a slab under Occupations Code Sec. 1001.056(c)(2). But the single largest map unit is deep sand: Patilo and Arenosa soils cover 53,311 acres and drain fast enough that they can struggle to treat wastewater at all. Two very different foundation and septic answers, sometimes within a few miles. The site and soil evaluation the county requires is what settles it for your parcel.

Building in Guadalupe County?

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

Start your project