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

A county development permit is required before building a home in unincorporated Harris County, and Harris County does not have a full building code^1,2. Builders, developers and contractors for single-family residential development must submit notices of foundation, frame and final inspections through ePermits⁹. A single-family home or duplex built in the floodplain also needs an Elevation Certificate, an As-Built Certificate and a final inspection⁹. All work in a regulated floodplain needs a Floodplain Development Permit, including grading, filling, paving and construction⁴. Application, permit and administrative fees vary, so use the fee schedule for each development, septic, driveway or floodplain application^9,12. The county's Certificate of Compliance applies to qualifying commercial structures, not as a general residential certificate of occupancy¹³.

The Harris County Office of the County Engineer handles development and floodplain permits in unincorporated Harris County; call the Permits Division at 713-274-3900^1,4. City building offices handle building permits in Pasadena¹⁴, La Porte¹⁵, Deer Park¹⁶, Bellaire¹⁷, West University Place¹⁸, Webster¹⁹, Galena Park²⁰, Jersey Village²¹. Baytown requires city approval for residential fences and manufactured-home parks²²; Tomball requires a city permit to construct or enlarge an RV park²³. Harris County Wastewater Permitting issues septic permits for unincorporated property; the Harris-Galveston Subsidence District issues well permits, with a separate county approval-letter requirement unless an exception applies^5,10.

Harris County has no zoning regulations in its unincorporated area, but enforces floodplain, septic, driveway and sign rules³. City zoning applies inside Baytown²⁴, La Porte²⁵, Deer Park²⁶, Bellaire²⁷, South Houston²⁸, West University Place²⁹, Galena Park³⁰, Jacinto City³¹, Jersey Village³². County Wastewater Permitting’s septic authority described here covers unincorporated land; Galena Park requires city and county health-unit septic approval when its septic conditions apply, while Jacinto City provides a temporary city septic permit where sewer service is unavailable, subject to state requirements and county recommendation^5,33,34. Municipal subdivision review may also extend into extraterritorial jurisdictions⁶.

Installing or upgrading an on-site sewage facility in unincorporated Harris County requires an OSSF septic permit from Harris County Wastewater Permitting⁵. In ePermits, choose “Residential Onsite Sewage Facility (OSSF)/Septic” and upload the required property information, site evaluation, design plan, technical report, flow diagram and maintenance contract; the published review schedule is 30 business days, and other departments may need to approve the application¹⁰. Harris County cannot issue the county development permit until the OSSF installation-and-operation permit has been issued, so septic belongs early in the schedule³⁵. Initial and final septic inspections are required, and the licensed installer must give at least 24 hours' notice³⁶. Only 2.6% of county soils are rated without severe limits for a conventional drain field, making the site evaluation especially important³⁷. Wastewater must remain in the property's soil rather than surface or discharge into a ditch, stream or gully³⁵.

Unincorporated Harris County has no county zoning restriction on RV occupancy, tiny-home occupancy, manufactured-home occupancy, accessory dwellings, temporary camping, minimum dwelling size, minimum lot size, setbacks, lot coverage or building height⁸. That answer concerns county zoning only: a county development permit still applies to development, and an on-site wastewater system needs the applicable septic permit and inspections^1,5,36. Municipal subdivision review may reach some extraterritorial jurisdictions⁶. A homeowner responsible for qualifying work on an industrialized house can seek a state residential installation permit instead of registering as an industrialized builder, but that permit does not waive applicable local permits or inspections⁷. State trade-license exemptions for work on an owner's residence are conditional, not a blanket exemption for every trade³⁸.

1. Confirm whether the parcel is unincorporated, inside a city or in a municipal extraterritorial jurisdiction; municipal development or subdivision review may apply outside the county's unincorporated process⁶.
2. Check the floodplain before design; all floodplain work needs a Floodplain Development Permit, and floodplain homes require elevation documents and a final inspection^4,9.
3. If the site needs septic, apply through ePermits first because Harris County cannot issue the county development permit until the OSSF installation-and-operation permit is issued^10,35.
4. Apply for the county development permit before construction and consult the fee schedule for variable application, permit and administrative fees^1,12.
5. Submit a completed residential application and detailed site plan for a driveway in county right-of-way, including a roadside ditch; state-highway access follows TxDOT's separate driveway-permit process^1,11.
6. For a private well, obtain the district permit and determine whether the county approval-letter requirement or an exception applies¹⁰.
7. Submit the residential foundation, frame and final inspection notices, and arrange the septic system's initial and final inspections^9,36.

Before buying unincorporated Harris County land, verify city and extraterritorial-jurisdiction boundaries, plat status, floodplain, legal road access, water source and wastewater plan^4,6. A driveway crossing county right-of-way needs a county driveway permit, while state-highway access follows TxDOT's driveway-permit process^1,11. For a private well, ask the Harris-Galveston Subsidence District about its well permit and the County Engineer about the separate approval letter; county exceptions include parcels of at least 10 acres and qualified open-space land, and the county response time for the notice and diagram is 10 business days¹⁰. Septic feasibility deserves attention because only 2.6% of Harris County soils are rated without severe limitations for a conventional drain field³⁷. Typical property taxes run about 1.7% of value, with a median annual bill near $4,382, while a typical home insurance premium is about $2,702 a year³⁷. County fees vary by application¹².