Build to the adopted code. Verify every exception.

Waller County Engineering Division, Waller County Fire Marshal's Office, and Waller County Environmental Division is the identified county-level authority for this profile. Confirm that the property is in its service area before filing.

Begin with the online permit gateway listed in the application guide. If the portal does not recognize the address or project type, contact Waller County Engineering and Fire Marshal: 979-826-7670; Environmental Division/OSSF: 979-921-0391.

The Fire Marshal attempts to respond to a complete plan submittal within 14 business days; corrected resubmittals restart review and may take up to 15 business days. The binding Fire Code deadline is to issue or deny a complete, fully paid application within 30 days. Fire construction must start within 180 days after permit issuance, although two six-month extensions may be granted in writing. The residential development permit is valid for one year. The county publishes no guaranteed general Engineering or OSSF turnaround on its permit pages.

Apply for residential building, culvert, 911-address, and environmental/OSSF permits through MGO Connect after selecting Texas - Waller County; a county 911 address must issue before any permit, and payment is due before processing. For civil site development, submit the county Request for Final Inspection certified and sealed by the project's Texas professional engineer; Engineering inspects county-road construction, commercial driveways, and subdivision development, and its construction notes require notice at engineeringinspection@wallercounty.us at least 48 hours before construction and paving activity. Fire-code inspection requests must go through the general contractor by email to firecodeinspections@wallercounty.us; submit the completed, signed, and sealed final-inspection form when ready, and obtain a Certificate of Compliance before occupancy. Coordinate OSSF authorization, pre-cover/final inspection, and approval to operate with Environmental at 979-921-0391; do not install a private septic system before obtaining its requirements and permit.

In unincorporated Waller County, the Engineering Division administers county development, floodplain, drainage, driveway/culvert, right-of-way, subdivision, commercial-site-plan, rental-community, tiny-home, and RV-park regulations. Effective January 1, 2025, the Waller County Fire Code adopts the 2021 International Fire Code in its entirety with Appendices A-N and county amendments for new construction and substantial improvements to commercial establishments, public buildings, and multifamily residential structures with four or more units; the 2021 IFC's referenced standards also apply. The county does not publish a generally adopted residential IRC or a county structural-code inspection program for ordinary one- and two-family homes. OSSFs are governed by the county local order, Texas Health and Safety Code Chapter 366, and 30 TAC Chapter 285. The county FAQ's structure/slab permit trigger begins at 100 square feet, so smaller structures may avoid that size-based development category, but a permit can still be required for work in a FEMA special flood hazard area, more than 500 cubic yards of fill or excavation per acre, a grade change of at least six inches, any driveway or county right-of-way work, septic work, paving, drilling, equipment or material storage, detention facilities, or other listed development. Ordinary cosmetic work that does not constitute one of those activities has no published county development-permit trigger. The county Fire Code applies only to commercial establishments, public buildings, and multifamily dwellings with four or more units—not ordinary one- and two-family residential construction. Confirm all exemptions with Engineering because the residential application states that all new development requires review.