Building permits, zoning and land rules in Gillespie County, Texas

Unincorporated Gillespie County has no general countywide building permit for a house¹. What it does have is a Development Permit Determination Form (DDF), which the Engineering Department requires before you start any new construction, grading or paving on a property¹. You submit the DDF first, and the Engineering Department reviews it and either tells you no additional permit is needed or hands you a Development Permit Application with a checklist for your project¹. Whether you owe anything further depends mostly on how close your site sits to the 100-year floodplain and the scope of the work, so treat the DDF as the first call you make, not a formality to skip¹⁰.

Gillespie County does not have a separate building inspections department; the Engineering Department handles development permitting, floodplain review, right-of-way permits, and subdivision and manufactured home rental community applications for unincorporated Gillespie County¹. Reach the Engineering Department at 830-307-6196 or engineering@gillespiecounty.org, at 101 West Main St., Room B-105, Fredericksburg, TX 78624¹. Right-of-way permit applications get a completeness notice within 10 business days and a full review within another 10 business days once the application is complete, and you cannot start construction in the right-of-way before that permit is approved¹.

The county's own project narrative states that Gillespie County has no comprehensive zoning ordinance for unincorporated land, so it sets no zoning districts there². One exception exists: the county's airport zoning ordinance limits the height of structures and trees around Gillespie County Airport, and a project under the airport airspace outline may need an FAA Form 7460-1 airspace study filed at least 45 days before construction³. Inside the City of Fredericksburg, the city's Planning and Development Division administers the zoning ordinance, not the county⁴. Septic permits stay with the county Sanitation Department for every address, city or not⁵. Inside a platted subdivision, the county's subdivision rules still apply: lots require a 20-foot building setback on the front, sides and rear, and lot size is set by the water and wastewater service the subdivision uses, from 6 acres per lot with an individual well down to 1 acre with community water and sewer⁸. We could not confirm a general minimum dwelling size, lot-coverage limit or building-height limit in unincorporated Gillespie County, so ask the Engineering Department before you design.

Septic systems (OSSFs) in Gillespie County are permitted by the county's own Sanitation (On-Site Sewage Facilities) Department, not by the state⁶. Your OSSF application is not considered complete until the Engineering Department has signed off on your Development Permit Determination Form and floodplain review and sent a copy to the OSSF Office, so that form comes before, not after, your septic paperwork⁶. Statewide, Texas requires a permit and an approved plan for every OSSF, with a narrow exception for a single-family home on at least 10 acres that meets a list of conditions, including keeping every part of the system at least 100 feet from the property line⁷. Soils matter here: only about 4.2% of Gillespie County's land lacks severe limitations for a conventional septic drain field, so most rural buyers should plan and budget for an engineered or alternative OSSF rather than assume a standard drain field will pass¹¹.

Unincorporated Gillespie County has no general zoning ordinance, so there are no zoning districts that sort RVs, tiny homes or manufactured homes by use². We could not confirm a county rule on temporary camping or on accessory dwellings, however, so call the Engineering Department before you put an RV or second dwelling on a tract¹. Inside Fredericksburg, the city's zoning ordinance governs instead⁴. Any dwelling still needs a working water source and a legal way to handle wastewater, and a well must be registered with the Hill Country Underground Water Conservation District⁹. If your property sits inside a platted subdivision, that subdivision's own setback lines still apply⁸.

1. File a Development Permit Determination Form with the Engineering Department before you break ground on new construction, grading or paving, and wait for their response on whether more permitting is needed¹.
2. If your land is inside a platted subdivision, confirm the plat's 20-foot setbacks and the minimum lot size tied to your water and wastewater service before you site the house⁸.
3. If you need a well, register it with the Hill Country Underground Water Conservation District, and apply for a district permit if it will serve commercial, irrigation or public-supply use⁹.
4. Apply for your OSSF (septic) permit with the Sanitation Department once the Engineering Department has signed your DDF⁶.
5. If your only access is a driveway onto a state highway, file TxDOT Form 1058 for a driveway permit and give TxDOT 24-hour notice before you start work in the right-of-way¹².
6. If your driveway or any improvement instead touches a county road right-of-way, get a right-of-way permit from the Engineering Department before construction starts¹.

Water: any well needs to be registered with the Hill Country Underground Water Conservation District, and a new permitted well carries a $1,000 application fee plus a $100 refundable deposit, so budget for it before you assume a tract has cheap water⁹. Soils: with only 4.2% of Gillespie County's land free of severe limitations for a conventional septic drain field, ask the Sanitation Department early whether your specific parcel will need an engineered system^6,11. Flood: if any part of your site is near the 100-year floodplain, the Engineering Department's floodplain review adds an administrative fee of $100 to your Development Permit Determination Form, and building before approval doubles the calculated fee¹⁰. Climate and taxes: Gillespie County sits in severe drought roughly 46% of years, which can strain a private well in a dry stretch, and the median property tax bill runs about $4,404 a year at an effective rate near 1%¹¹. The nearest city of 100,000 or more is about 69 miles from the county center, worth weighing against how often you will need a hospital, hardware store or airport¹¹.