Healthy-home design-build in Boerne, Texas
Kendall County · Hill Country flank · Climate zone 3A
Boerne is the western edge of our service area and the only city on this list that reads as climate zone 3A rather than 2A on the 2015-era map. That single line changes the assembly maths: a slightly cooler, slightly less punishing summer against a more meaningful heating season shifts where insulation and vapour control belong.
The city runs on the 2021 residential code with the 2021 IECC and NEC 2023, permitting through MyGovernmentOnline for filings on or after 14 July 2025. Kendall County's Hill Country geology means rock, drainage, and septic siting are usually resolved before the house is designed.
Jurisdiction facts
Authority of record: Boerne. Every row below is transcribed from the primary source linked at the bottom of this panel. Anything we could not confirm is flagged rather than stated.
- Adopted residential code
- 2021
- Energy code
- 2021 IECC (NEC 2023)
- Permit portal
- MyGovernmentOnline
- Inspection regime
- City building department performs the inspections.
- Overlays and site programmes
- Kendall County reads as climate zone 3A on the 2015-era map
- County
- Kendall
- Climate zone (2015-era map)
- 3A
- Climate zone (2021-era map)
- Pending Verification
Source: https://www.ci.boerne.tx.us/81/Permitting-and-Code-Compliance · Last verified August 29, 2026 · MyGovernmentOnline handles permits filed on or after 2025-07-14.
Climate-zone note
Boerne sits in climate zone 3A on the 2015-era map — hot and humid. For most of the year the moisture drive runs from outside toward the interior, which is the opposite of the cold-climate assumption most published detailing is written around. That single fact governs where the vapour control belongs, how a wall is expected to dry, and why an interior polyethylene layer is the wrong answer here.
The 2021-era zone designation for this jurisdiction is not settled in our record and carries a Pending Verification flag. It does not change how we detail an assembly, but it can change which code table applies, so we confirm it before submittal rather than assume it.
What we run into here
- Kendall County reads as climate zone 3A on the 2015-era map — the only jurisdiction on this list that is not 2A.
- Hill Country geology: shallow rock, steep drainage, and septic siting that governs the site plan.
- City-run inspections through MyGovernmentOnline for recent filings.
Elsewhere in the corridor
Building in Boerne?
Start with an intake. It asks what the house has to do and what the site imposes — never anything about anyone's health.
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