Detached garages and RV garages in San Antonio, Texas

A building that shares nothing with the house: no common wall, no common roofline, no common foundation. The frame can go as wide and tall as the lot and the rules allow, and the fumes, noise and fire load stay out of the living space.

Three numbers decide the building, and they decide it first: clear width across the bay, clear height under the frame, and the door opening size. They go on the building order, since the plant punches and welds the steel for those openings. Move a door later and the frame around it moves too.

Taller than the rig, by more than most owners guess. Measure the vehicle loaded, at its highest point, which is usually the roof air conditioner shroud, not the roofline, then add room for the door track, the header and a powered opener.

Get two heights in writing, because they differ: the clearance at the door opening, which is what you drive through, and the clear height under the lowest structural member inside, which is what a lift or a bunk sits under. Depth counts just as much: a hitched tow vehicle, a ladder off the back and space to walk past the mirrors all come out of the slab, not the coach.

Inside the city, count on it. In San Antonio, building, remodeling, repairing or tearing down a structure on a property typically takes a building permit. The city exempts one-story detached accessory structures used as tool and storage sheds, playhouses and the like, up to 300 square feet of floor and within the setbacks in Unified Development Code section 35-370(b), and that is the only accessory building size exemption it states. A bay you can park in passes 300 square feet before the vehicle rolls in.

The posted fees are flat: $184.00 for carport covers and decks and $184.00 for repairing an existing foundation, while new residential construction goes by the square footage of the job. One more city step catches owners clearing ground for the pad: a tree application has to go in before any development of property in San Antonio, with a tree preservation plan under Unified Development Code section 35-523 where trees come out or vegetation is disturbed.

Checked at City of San Antonio Development Services, residential permits and no permit required list, 2026-09-13.

Checked at City of San Antonio Development Services, FY 2027 development fee schedule, 2026-10-03.

Checked at City of San Antonio Development Services, tree preservation, 2026-09-13.

Checked at Bexar County Public Works Department, Floodplain Development Permits, 2026-09-13.

Checked at Bexar County Public Works Department, Right-of-Way Permits, 2026-09-13.

That turns on the county line, and the biggest county does not give a clean answer. In unincorporated Bexar County the Fire Marshal Office at 210-335-0300 decides when structures not for single-family dwelling use need building permits, counting one structure with three or fewer dwelling units as single-family, and that permit reaches site clearing as well as the build. The county pages list no county building permit requirement for a one-to-three-unit dwelling and do not say which side of that line a detached garage serving a house lands on, so make the call before ordering steel.

The other six answer for themselves. Medina County posts a one-page list of the permits it requires: 911 addressing, water well, floodplain, septic, and driveway and utility. A building permit for a commercial or accessory structure is not on it (Medina County, What Type of Permits Are Required In Medina County?, checked 2026-09-13); confirm at 830-741-6000. Each county office and answer is on the county index. A county that posts no building permit is not a lot without rules: Chapter 233 of the Local Government Code leaves a county with no general commercial building code, and floodplain, septic and driveway permits apply all the same.

Checked at Bexar County, building permits and fire marshal code enforcement pages, 2026-09-13.

Whole chapter checked; it gives counties no such power. Checked at Texas Legislature Online, Local Government Code Chapter 233, county regulation of housing and other structures, 2026-09-13.

Checked, and the item is not there. Checked at Medina County, What Type of Permits Are Required In Medina County?, 2026-09-13.

State law asks less here than for any other building on this site. When nobody holds out to offer engineering services to the public, Occupations Code 1001.056 lets a private home, and a garage or other structure pertinent to one, skip the state engineering chapter. Separately, it lets a building skip it when the building is one story, 5,000 square feet of floor or less, with no clear span wider than 24 feet across its narrow side.

That is the state minimum, not a reason to skip a designed foundation. A city, a lender or the manufacturer can still ask for a sealed plan, and the frame still bolts to anchor bolts cast into the slab, with the column reactions sizing what goes under them. The full story: the slab and foundation sheet.

Checked at Texas Legislature Online, Occupations Code Chapter 1001, engineers and engineering, 2026-09-13.

It carries two loads at once, and only one is the building. At each column base the frame pushes down, pushes out and, in a windstorm, pulls up, per the manufacturer's reaction sheet. The floor carries what a house garage slab never does: a loaded motorhome parked in one spot on a few tire patches, plus jack pads or a lift. Tell the contractor the heaviest vehicle that will sit there, since thickness, reinforcing and joint layout are designed to that answer.

The ground sets what that design costs. North Bexar County is shallow or very shallow stony soil over hard limestone, while the east and west uplands are deep, slowly permeable clay that cracks wide as it dries (USDA Soil Conservation Service, Soil Survey of Bexar County, Texas, 1966, checked 2026-09-13). Settle the apron in the same talk: the concrete ends at the door, and the RV keeps going.

Checked at USDA Soil Conservation Service, Soil Survey of Bexar County, Texas (1966), 2026-09-13.

Owners learn this one when the concrete truck cannot get in. A new or changed driveway onto a state highway means filing Form 1058 at the local TxDOT district office. The right of way stays untouched until the permit is executed in full and TxDOT has 24 hours notice, and the manual sets the driveway angle at 75 to 90 degrees. The TxDOT San Antonio District, 210-615-1110, lists Atascosa, Bexar, Frio, Guadalupe, Medina and Wilson among its counties; Karnes County is not on the list.

On a county road the county usually issues it, with office and fee changing at the county line. Bexar County Public Works controls all construction in county-maintained rights of way, driveways onto county roads included, and charges $35 per driveway (Bexar County Public Works, Right-of-Way Permits, checked 2026-09-13). Inside a city, ask the city that has your address: Devine, for one, runs driveway, curb cut and culvert inspections through its Code Compliance Department at 830-663-2804.

Checked at Texas Department of Transportation, access management manual, driveway permits, 2026-09-13.

Checked at Texas Department of Transportation, San Antonio District, 2026-09-13.

Checked at Bexar County Public Works Department, Right-of-Way Permits, 2026-09-13.

Checked at City of Devine, Code Compliance Department, 2026-09-13.

The $50,000 line stays away while the building stays yours. TDLR says the accessibility law and the Texas Accessibility Standards are meant for public and commercial buildings and facilities, and stay out of private residences. That shifts once the building earns money: under the 2012 Texas Accessibility Standards, when a commercial facility or public accommodation sits inside a private residence, the part used only as a home is outside the standards and the part used to run the business is inside them. Renting bays is the case to take to the design professional, since coverage turns on the Government Code 469.003 definitions and the $50,000 registration line follows from those.

The aquifer rules do reach a house, through its concrete. On the recharge, transition or contributing zone, construction cannot start until TCEQ approves an Edwards Aquifer protection plan, and the program lists Bexar and Medina among the counties here, with only parts of the aquifer regulated. TCEQ lists when a homeowner may not need an individual plan: a home in a master community whose plan is already approved; a lot over five acres with no more than one residence; impervious cover held at or under 20 percent of the lot; or rainwater harvesting that brings adjusted impervious cover to 20 percent or less. Rooftops, driveways, concrete pads, sheds and sidewalks all count. A garage roof, its apron and the drive to the road are how a lot passes 20 percent, so run that number before sizing the building.

Checked at Texas Department of Licensing and Regulation, elimination of architectural barriers at a glance, 2026-09-13.

Checked at Texas Department of Licensing and Regulation, 2012 Texas Accessibility Standards, scoping requirements, 2026-09-13.

Checked at Texas Department of Licensing and Regulation, Architectural Barriers frequently asked questions, 2026-09-13.

Checked at Texas Legislature Online, Government Code Chapter 469, elimination of architectural barriers, 2026-09-13.

Checked at Texas Commission on Environmental Quality, Edwards Aquifer Protection Program, 2026-09-13.

Checked at Texas Commission on Environmental Quality, Edwards Aquifer private residences, 2026-09-13.

Deed restrictions and homeowner association rules are private agreements on your property, not government permits, and nothing on this site can say what yours contain. Read your deed and any subdivision covenants on accessory buildings, metal siding, height, setbacks and how many structures a lot can hold, and ask the association in writing before the order goes in.

A bathroom, a sink or a floor drain turns it into a septic question on any lot off the sewer. Building, installing, altering, extending or repairing a septic system (an on-site sewage facility, in the state's words) requires a permit and approved planning materials, and the permitting office has 30 days from receipt to rule. Each county here has its own authorized agent, so TCEQ is not the office. Decide before the pour, because the drain goes in the ground first.

Checked at Texas Commission on Environmental Quality, getting a permit for an on-site sewage facility, 2026-09-13.

Checked at Texas Commission on Environmental Quality, On-Site Activity Reporting System, authorized agent search by county, records read for Bexar, Medina, Wilson, Atascosa, Guadalupe, Karnes and Frio, 2026-09-13.

It suits an owner with a vehicle, boat or RV that should not bake in the sun, and a lot with room to swing it in. It is wrong for two readers. If you will work in there, with a bench, a compressor and a lift, size, wire and insulate it as a shop: metal shop buildings. If it is ranch equipment, trailers or a fleet that never needs four walls, open sides cover more ground per dollar of steel: storage buildings for equipment and RVs. The whole job in order: the start-to-finish San Antonio guide.

Price this building off the two clear heights and the bay width, not the floor area. Those numbers go in the request, and it reaches a single independent metal building contractor, whose call it is which jobs to accept. Home builders and general contractors hold no state license in Texas, so the license numbers worth seeing belong to the electrician, the air conditioning contractor and the plumber.

Get on paper: the clear width, door opening and both clear heights the price assumes; slab thickness, reinforcing and vehicle load; whether the apron and approach are in or out; who pulls the permit; and what is left out, the drive and the power run above all. No metal building company serving the San Antonio area posts a price, and a bay built around one vehicle is no catalog item, so the number comes off your measurements and your lot.

Checked at Sunset Advisory Commission, Texas Residential Construction Commission; TDLR regulated industries list, 2026-09-13.

Company price pages checked; none shows a figure. Checked at Four San Antonio-area metal building company websites, 2026-09-13.