Unincorporated Fayette County, Texas requires a development permit before construction, even outside the floodplain; we could not confirm a separate general building permit1. Fayette County has no county zoning, but municipal zoning applies in Flatonia, Schulenburg and Round Top2345. Septic permits go through the County Inspector where the county OSSF program applies; incorporated cities are excluded unless an interlocal agreement extends that program67.
At a glance
- Building permit
- County development permit required for homes and other development in unincorporated areas; separate general building permit not confirmed18
- Zoning
- No county zoning in unincorporated areas; municipal zoning in Flatonia, Schulenburg and Round Top2345
- Septic
- County permits and inspections apply in its jurisdiction; incorporated cities may differ7910
- Well
- Registration required for every well; a permit ($250) only above 25,000 gal/day or 17.3 gpm11
- RV / tiny home / manufactured home
- No county zoning restriction in unincorporated areas; development, septic and private restrictions still matter12192
- Owner-builder
- Industrialized-home owners may avoid builder registration but still need a state installation permit13
- New lots / subdivisions
- County rules regulate divisions outside cities; agricultural exceptions are conditional1415
- Occupancy letter
- Fayette County does not issue one; other applications and fees may still apply16
Who to call
Floodplain permits
Fayette County Office of Floodplain Management
The Class A/B floodplain-development permit required before any development in unincorporated Fayette County
151 N Washington St., Rm 307, La Grange, TX 78945
Septic permits
Fayette County Inspector's Office
OSSF (septic) permitting and inspection for Fayette County as TCEQ's authorized agent
151 N Washington St, Rm 307, La Grange, TX 78945
Well permits
Fayette County Groundwater Conservation District
Well registration (required for every well) and non-exempt well permits for Fayette County
info@fayettecountygroundwater.com
255 Svoboda Lane, Room 115, La Grange, TX 78945
Contact details are copied from each office’s official page and were checked against it on October 11, 2026.
Off-grid gear
Going off-grid in Fayette County means bringing your own water and power. The kit we’d start with:
- Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
- Power Bluetti Solar generators and home battery backup for living off the grid.
- Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
- Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.
These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.
Do you need a building permit in Fayette County, Texas?
Before building a home or undertaking other development in unincorporated Fayette County, request an application from the Office of Floodplain Management: Class A covers development outside the FEMA 1%-chance flood area, and Class B covers development within it1. Post the development permit at the job site where it is clearly visible from the nearest road or street1. The published fee schedule lists a $100 development-permit application for homes, barns, barndominiums and manufactured homes, but the development instructions list different Class A/B fees; confirm the amount with Floodplain Management81. We could not confirm a separate general county building permit or residential building-code inspection program; floodplain-compliance inspections do apply to permitted development117. Fayette County does not issue occupancy letters16.
Who issues building and development permits in Fayette County?
For development in unincorporated Fayette County, contact the Fayette County Office of Floodplain Management at (979) 968-6469, at 151 N Washington St., Rm 307, La Grange, TX 78945181. Ask that office what the development application requires for the proposed structure; we could not confirm a separate general county building permit1. County development and subdivision rules described here concern land outside municipal limits; Flatonia and Schulenburg have municipal zoning ordinances, and Round Top sets its own zoning114345. The County Inspector's Office handles septic permits and inspections where the county OSSF program applies; incorporated cities are excluded unless an interlocal agreement extends that program67.
Does Fayette County have zoning?
Fayette County has no zoning authority over private land use in unincorporated areas, but deeds, restrictive covenants, easements, subdivision regulations, floodplain rules and septic requirements can still restrict a parcel2. Flatonia amended its zoning ordinance in 2026, Schulenburg publishes zoning-map and variance materials, and Round Top divides land into zoning districts345. Municipal zoning does not determine septic authority: the County Inspector administers the county OSSF program within its jurisdiction, including cities only through interlocal agreements67. Outside municipalities, covered land divisions still need county subdivision approval or a determination that platting does not apply before utilities can connect14.
How do septic permits work in Fayette County?
In the Fayette County septic program's jurisdiction, OSSF installation, repair, alteration, and tank replacement require a septic permit, inspection, and approval through the County Inspector's Office910. The published county fees include $275 for a single-family conventional or listed non-aerobic system and $375 for a single-family aerobic-spray system8. The county rules principally cover unincorporated land; incorporated cities are excluded unless an interlocal agreement makes the county rules applicable there7. A narrow state exception may apply when a tract is at least 10 acres, has a single-family home as its only dwelling, and keeps every part of the system at least 100 feet from the property line, among other conditions19. Call the County Inspector's Office at 979-968-1809 before installing or repairing a system6.
Can you live in an RV or tiny home on your land in Fayette County?
Unincorporated Fayette County sets no county zoning-based occupancy restriction for RVs, tiny homes, manufactured homes, accessory dwellings or temporary camping, and no zoning-based minimum dwelling size, setback, lot-coverage or building-height limit12. Private deed restrictions can still limit use of a Fayette County parcel2. Placement or construction of a tiny home or manufactured home in unincorporated Fayette County still requires the applicable development permit, and septic permitting applies where the county OSSF program has jurisdiction189. An owner installing industrialized housing for personal use may avoid industrialized-builder registration but must obtain a state residential installation permit; that exception does not cover ordinary site-built homes13.
Building a home in Fayette County: the steps, in order
- Before construction in unincorporated Fayette County, request a development application from Floodplain Management and establish whether Class A or Class B applies181.
- Apply to the County Inspector for a septic permit before installation, repair, alteration or tank replacement within the county program's jurisdiction69.
- Register a new well with the Fayette County Groundwater Conservation District; larger wells need a well permit2011.
- Resolve subdivision platting before a covered sale contract or conveyance outside municipal limits; utilities need a written determination of plat approval or inapplicability14.
- For an agricultural division, establish each daughter tract's separate, exclusive public-road access, conveyed and recorded with the tract; agricultural use alone does not establish an exemption15.
- Obtain a TxDOT driveway permit before constructing a driveway onto a state highway21.
What to check before you buy land in Fayette County
For a new lot in unincorporated Fayette County, distinguish total area from buildable area: subdivision plat documentation requires lots or tracts of at least 2 acres configured for compliant sewage disposal22. The subdivision regulations separately require 170 feet of width and depth for platted or exempt lots, subject to stated shape exceptions and Commissioners' Court approval, and at least 1 acre of buildable area outside the 1%-annual-chance flood zone for new lots14. An agricultural exemption requires separate, exclusive access at least 30 feet wide to an existing public road, owned in fee or easement, conveyed and recorded with each daughter tract15. A daughter tract with an access path or public-road frontage below 60 feet is barred from further division; ask Commissioners' Court how the dimensional rules apply to the proposed agricultural exemption15. Only 4% of Fayette County soils are rated without severe limitations for conventional septic drain fields, so arrange a site evaluation before relying on a conventional system23.
Watch-outs
- Creating 5 or more lots within 24 months requires platting in unincorporated Fayette County; smaller divisions can also require platting14.
- Fayette County development permits apply outside the mapped floodplain too; contact Floodplain Management before assuming a high, dry lot is exempt181.
- Fayette County does not issue occupancy letters, but other applicable local, state or federal applications and fees may still be required16.
Sources
- Instructions for Permit Application for Proposed Development, quoted and re-checked
- Fayette County Zoning Information and Certificate of Occupancy Letter, quoted and re-checked
- City of Flatonia Ordinance 2026.01.01, quoted and re-checked
- Building Permits & Inspections – City of Schulenburg, quoted and re-checked
- Town of Round Top: Round Top Code, Sec. 34-41—Establishment of districts (Fayette County), quoted and re-checked
- Fayette County Inspector's Office (co.fayette.tx.us)
- Fayette County Sewage & Wastewater, quoted and re-checked
- Fee Schedule, quoted and re-checked
- Fayette County Sewage & Wastewater, quoted and re-checked
- Fayette County Sewage & Wastewater, quoted and re-checked
- Forms & FAQ'S, quoted and re-checked
- Texas law on county zoning and building authority
- Industrialized Housing and Buildings Justification for Administrative Rule Adoption, quoted and re-checked
- Fayette County Subdivision Regulations, quoted and re-checked
- Fayette County Subdivision Regulations — Exceptions to Subdivision Platting Requirements, quoted and re-checked
- Fayette County Zoning Information and Certificate of Occupancy Letter, quoted and re-checked
- Instructions for Permit Application for Proposed Development Within Unincorporated Areas of Fayette County, quoted and re-checked
- Fayette County Office of Floodplain Management (co.fayette.tx.us)
- Getting a Permit for an OSSF - Such as a Septic System (Texas statewide rule), quoted and re-checked
- Fayette County Groundwater Conservation District (fayettecountygroundwater.com)
- Section 4: Driveway Permits, Design, and Materials (Texas statewide rule), quoted and re-checked
- Fayette County Subdivision Regulations, quoted and re-checked
- Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
Written October 11, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.