Kendall County — Boerne, Comfort, Fair Oaks Ranch, Waring — is the front porch of the Hill Country: 30 minutes from San Antonio, genuinely rural once you leave I-10, and one of the fastest-growing counties in Texas. That growth cuts both ways for barndo builders: strong resale and good builder availability, but rising land prices and more deed-restricted subdivisions every year.
Permits you’ll need (unincorporated Kendall County)
| Requirement | Details |
|---|---|
| Development permit | Required for new residential development in unincorporated areas. |
| Inspections | Limited county inspection regime — far lighter than Hays; your lender’s draw inspections are often the main third-party check. |
| Septic (OSSF) | Mandatory. Thin limestone soils mean aerobic systems on most sites ($12K–$20K installed). |
| Floodplain | FEMA-zone parcels need floodplain compliance — Guadalupe tributaries and creek bottoms flood hard here. |
| Edwards Aquifer | Southern Kendall County touches the recharge/contributing zone — affected sites face extra review that can add 90–120 days. |
ETJ warning: Boerne’s ETJ reaches well beyond city limits along the I-10 and Highway 46 corridors, and Fair Oaks Ranch is almost entirely municipal. Land inside an ETJ picks up city requirements. Verify parcel status before closing.
Deed restrictions first. More than any county we cover, Kendall’s growth means much of the available land is in platted subdivisions — and many restrict metal buildings, set minimum square footage, or require masonry percentages. Read the restrictions before you fall in love with the lot. Full context: permits and zoning in the Hill Country.
Terrain and site costs
Classic limestone country: budget for rock excavation on slab, trenches, and septic lines. Water is a real planning item — Kendall sits in the Cow Creek Groundwater Conservation District, and Trinity wells commonly run $20K–$45K where co-op water doesn’t reach. Check local co-op coverage before pricing land. Related: choosing the right land.
What it costs in 2026
Kendall carries part of the San Antonio metro premium: turnkey builds commonly land $130–$170/sq ft, with Boerne-area custom builds well beyond. Shell-and-finish-later is popular here precisely because land costs eat budgets. Full numbers: how much does a barndominium cost in the Hill Country?
Financing note
Kendall’s strong comps make lenders comfortable — construction loans are easier to place here than in the western counties. What lenders look for: financing your barndominium.
FAQ
Do I need a building permit for a barndominium in unincorporated Kendall County?
A development permit, yes; a full city-style building permit, no. Septic is mandatory, floodplain rules apply, and Boerne’s ETJ adds city requirements near town.
Can I build a barndominium in Fair Oaks Ranch or inside Boerne?
Inside city limits you’re under full municipal codes and, in most Fair Oaks Ranch neighborhoods, HOA rules that typically exclude metal-exterior homes. Most Kendall barndos go up in the unincorporated north and west.
What’s the biggest budget surprise in Kendall County?
Rock. Excavation overages on slab and utilities are the most common change order — ask every builder how they price rock (fixed allowance vs. open-ended T&M) before signing.
Building near Boerne or Comfort? Get matched with a Kendall County builder →
Towns in Kendall County
Town-level guides with local permitting, site conditions and cost tables: