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

No, not for an ordinary single-family home in unincorporated Grayson County¹. Grayson County does not issue Certificates of Occupancy; covered commercial, public, and larger multifamily projects instead receive a certificate of compliance after approved inspections¹. The county has adopted a fire code, not a countywide general building code, for commercial and public buildings and multifamily dwellings with four or more units in unincorporated areas⁵. Purely agricultural buildings with no workers present and no public access are exempt from that fire code, as are single-family homes, duplexes and triplexes⁶. A single-family home still needs the county's Development Certificate before construction².

For anything you build, place or remodel, contact Grayson County Development Services, which issues the Development Certificate and coordinates 911 addressing, culverts and floodplain determinations at the same time^2,7. For septic systems, contact the county's On-Site Sewage Facilities office directly; Grayson County Development Services is the county's authorized OSSF permitting agent^1,7. For a fire-code building permit tied to a commercial, public, or multifamily project with four or more units, contact the Grayson County Fire Marshal's Office^5,8. The published schedule charges $100 per 1,000 square feet for those buildings and $100 for the certificate of compliance; working without a permit doubles the permit fee⁹.

Zoning varies within unincorporated Grayson County. County-administered zoning applies in the Lake Ray Roberts Land Use Plan and North Texas Regional Airport–Perrin Field regulation areas, while the county states that its other unincorporated areas have no zoning regulations⁴. Outside those designated areas, the county sets no minimum dwelling size, minimum lot size, zoning setbacks, lot-coverage limit or building-height limit through zoning⁴. Private deed restrictions, restrictive covenants, or a homeowners' or property owners' association can still limit what you build⁴. Incorporated municipalities may set their own zoning, which Grayson County does not administer¹⁰. Subdividing land in unincorporated Grayson County also requires final plat approval before grading, selling lots, or starting related construction¹¹.

Every new or replacement septic system in Grayson County needs a permit, and the county requires an application, permit, authorization to construct, and construction inspection regardless of tract size¹. A $10 fee is collected on top of the county's own permit and inspection fees for the TCEQ Water Resources Management Account¹. Aerobic treatment is required on any parcel smaller than 2.5 acres, so know your exact acreage before you plan a conventional system³. If your land sits within 100 feet of a public sewage system, connecting to that system is required unless you get written approval from the County Engineer³. Soils here aren't especially forgiving: only 7% of Grayson County's land is free of severe limitations for a conventional drain field, reinforcing why a site evaluation matters early¹². To apply, contact the county's On-Site Sewage Facilities office⁷.

Grayson County's sources do not confirm a general right to occupy an RV, tiny home, manufactured home or accessory dwelling outside the two county zoning areas; ask Development Services about the parcel and proposed use⁷. County rule requires every residential structure and every recreational vehicle in the county's jurisdiction to be equipped with an on-site sewage facility, so an OSSF permit applies to an RV just as it would to a house³. Inside the Lake Ray Roberts Zoning District, an RV park operator needs a permit before operating, and an RV owner may not stay more than 14 days per month in a permitted RV park in the RS District¹³.

First, confirm whether your parcel is inside the Lake Ray Roberts or North Texas Regional Airport zoning area, because county zoning applies there but not throughout unincorporated Grayson County⁴. Second, mark your driveway entrance before applying; the Precinct Foreman determines whether a culvert is needed, and failing to mark it triggers a $100 re-inspection fee². Third, apply online for the Development Certificate, which also processes the 911 address, culvert installation and floodplain determination^2,7. Fourth, check the 2.5-acre aerobic-treatment threshold and apply for the OSSF permit through the county septic office^3,7. Fifth, secure final plat approval before subdivision-related work¹¹. A single-family home needs no county building permit or Certificate of Occupancy¹.

Confirm whether the parcel falls inside the Lake Ray Roberts or airport compatibility zoning area, because county-administered land-use zoning applies in those designated parts of unincorporated Grayson County⁴. Check whether the land is within 100 feet of a public sewage system, since that can require connecting instead of installing new septic³. Only 7% of county soils lack severe limitations for a conventional drain field, and parcels under 2.5 acres require aerobic treatment^3,12. Ask whether the tract carries deed restrictions or an HOA or POA obligation, since those can apply even where the county sets no zoning rule⁴. A new or revised driveway onto a Texas state highway requires a fully executed TxDOT driveway permit before construction begins¹⁴. The effective property-tax rate is about 1.3%, with a median annual bill around $2,953 and a typical home value around $289,706¹².