Unincorporated Randall County, Texas has no general residential building permit and no zoning ordinance; the county's own permits cover plats, driveway access and floodplain development123. Inside Amarillo and Canyon, the cities set their own zoning45. Septic permits in Randall County come from the Amarillo Area Public Health District, a city health department acting under county order, not from the county6.
At a glance
- Building permit
- No general residential permit in unincorporated Randall County; floodplain, driveway and plat approvals can still apply137
- Zoning
- None in unincorporated Randall County; regulated through subdivision platting instead82
- Septic permits
- Amarillo Area Public Health District (City of Amarillo Environmental Health), the TCEQ-authorized agent for Potter and Randall counties96
- Floodplain permit
- Required before development begins: Class A outside the mapped 100-year floodplain and Class B for land partly or wholly inside it3
- Driveway/culvert permit
- Required through Road & Bridge; published fee is $200, plus a processing fee for online or card payment10
- Septic minimum lot size
- 1 acre with a private well, 1/2 acre with a public water supply, with exceptions for lots platted before 198811
- RV / tiny home living
- Unrestricted under county rules in unincorporated areas, since Randall County has no zoning ordinance2
- Septic soil difficulty
- 22.3% of county soils are free of severe limits for a conventional drain field12
Who to call
Roads & driveways
Floodplain Development Permits (Class A and Class B), driveway/culvert access permits, and subdivision plat submittals for unincorporated Randall County outside Amarillo's ETJ
301 W Highway 60, Canyon, TX 79015
Septic permits
Amarillo Area Public Health District (City of Amarillo Environmental Health)
OSSF (septic) permit applications, plan review, and inspections for Randall County, acting as TCEQ's authorized agent under county order
Simms Municipal Building, Suite 275, 808 S Buchanan St, Amarillo, TX 79101
Contact details are copied from each office’s official page and were checked against it on October 9, 2026.
Off-grid gear
Going off-grid in Randall 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 Randall County, Texas?
No, unincorporated Randall County does not require a general residential building permit; county review instead centers on subdivision plats, road access and floodplain development1. Texas residential-code rules can apply only when an eligible county adopts the required order, and the available sources do not confirm that Randall County did so13. If that state-law program does apply to a new house on a vacant lot, the builder must arrange at least three inspections—for the foundation, framing and mechanical systems, and completed work—rather than obtain county approval before construction14. Amarillo separately enforces its residential code within the city, and that rule does not extend to unincorporated Randall County15; septic permits stay with the Amarillo Area Public Health District in either place6. A Randall County Floodplain Development Permit is still required before any development begins, and an approved plat may be required before land can be offered as building lots37.
Who issues floodplain, driveway and plat permits in Randall County, and how do you reach them?
Randall County Road & Bridge issues floodplain development permits and driveway/culvert access permits and takes county plat submittals; the county has no building department for residential building permits161. The office is at 301 W Highway 60, Canyon, TX 79015, and the phone number is 806-655-386116. No construction may begin until a Floodplain Development Permit is issued: Class A applies outside the mapped 100-year floodplain, while Class B applies when property lies partly or wholly inside it3. Plat documents for the Commissioners Court agenda must reach the Road Superintendent by 5 p.m. on the preceding Tuesday, except that plats in Amarillo's ETJ bypass the Randall County Commissioners Court17. County subdivision application fees follow the Commissioners Court's amendable fee schedule, and review, inspection or third-party testing can add variable charges18. Septic permits are not a county permit and go instead to the Amarillo Area Public Health District196.
Does Randall County have zoning?
No, Randall County has no zoning ordinance in unincorporated areas8, while the cities of Amarillo and Canyon each adopt zoning districts for land inside their city limits45. Outside Amarillo and Canyon, however, Randall County regulates plats and subdivisions: land cannot be laid out or sold as building lots without the required approval, and a street number generally will not be issued for a building without an approved plat unless an exception applies7. The county sets no zoning-based minimum home size, setbacks or building-height limit on unincorporated land2. RVs, tiny homes, manufactured homes and temporary camping are likewise unrestricted by county zoning, but floodplain, access, plat and septic requirements remain separate questions2320. A division into parts larger than 10 acres can avoid platting only when every part has access and no public improvement is dedicated17.
Who issues septic permits in Randall County?
Every OSSF in Randall County needs a permit from the Amarillo Area Public Health District, which Randall County has authorized by county order to permit and inspect septic systems, alongside Potter County96. Lot size matters here in a way most Texas counties don't specify: a property with a private water well needs at least 1 acre, and a property on a public water supply needs at least 1/2 acre, though exceptions may apply to lots platted before 198811. Homeowners can install or repair their own OSSF for a single-family residence they occupy, but rental properties, leased dwellings, or commercial operations must use a licensed installer, and every permit requires paying fees at submission21. An Authorization to Construct is valid for one calendar year, and the system must pass inspection within that window or a new permit is required21. Soils here are relatively more forgiving than many Texas counties: 22.3% of Randall County's land is free of severe limitations for a conventional drain field, though that still leaves most of the county needing a closer look before you count on a standard system12. Every OSSF also requires a 9-1-1 assigned address before you can get a permit22. If your land instead needs a well, portions of Randall County fall under the High Plains Underground Water Conservation District No. 1, which requires a permit before drilling any well expected to produce 17.5 gallons per minute or more23.
Can you live in an RV or tiny home on your land in Randall County?
Unincorporated Randall County has no zoning ordinance restricting RV or tiny-home occupancy and no county zoning minimum for home size2. That does not remove the development process: every project needs the applicable Class A or Class B Floodplain Development Permit before work begins3. Land undergoing subdivision review must also have adequate facilities or a plan to provide them; that rule does not require every existing parcel to connect to public water or sewer24. A private OSSF is allowed for a single-family residence when the owner obtains the required septic approval and meets the sanitation rules22. County subdivision rules also require satisfactory vehicular access, and a shared driveway serving multiple lots must meet county street standards20.
What are the steps to build a home in Randall County, in order?
First, ask Road & Bridge which Floodplain Development Permit applies; every project needs one before construction, with Class A used outside the mapped 100-year floodplain and Class B used for property partly or wholly inside it163. Second, verify that the parcel has an approved plat or qualifies for an exception before relying on it as a building site7. Third, order a septic site evaluation; only 22.3% of county soils lack severe limitations for a conventional drain field12. Fourth, obtain a 9-1-1 address and apply to the Amarillo Area Public Health District for the OSSF permit1922. Fifth, apply through the Randall County Road Department for a driveway permit, giving 24-hour notice before right-of-way work, and confirm the $200 fee plus any payment-processing charge2510. Finally, ask Road & Bridge whether the conditional state residential-inspection program applies to the project, because the available sources do not confirm Randall County adopted it14.
What should you check before buying land in Randall County?
Water deserves an early feasibility check: annual precipitation is about 19 inches, and severe drought occurs in 37.9% of years2627. Only 22.3% of county soils lack severe limitations for a conventional septic drain field, so do not assume a standard system will fit the site12. Portions of Randall County fall within the High Plains Underground Water Conservation District, where a well expected to produce at least 17.5 gallons per minute requires a permit; the cited rule does not establish requirements outside the district23. Check the flood map because it determines the permit class, not whether a county floodplain permit is needed3. Confirm that any recently divided tract has the required county approval and ask for the current subdivision fee schedule, since review, inspection and third-party testing charges vary718. The effective property-tax rate is about 1.6%, and the median annual bill is about $3,5872829.
Watch-outs
- Randall County's septic authority is a city health department, the Amarillo Area Public Health District, not a county office; don't call Randall County directly for OSSF permits6.
- We could not confirm that Randall County adopted the state residential-code inspection program, so ask Road & Bridge whether your project needs the foundation, framing and final inspections described by that conditional law14.
- The driveway/culvert permit fee page doesn't state an effective date, so confirm the current $200 fee and any card-processing surcharge with Road & Bridge before paying10.
Sources
- Randall County Subdivision Regulations (2026 county census)
- Texas law on county zoning and building authority
- Floodplain Management, quoted and re-checked
- Planning - City of Amarillo, quoted and re-checked
- 2023 City of Canyon Zoning Regulations, quoted and re-checked
- On-Site Sewage Facility, quoted and re-checked
- 2023 Randall County Subdivision Regulations, quoted and re-checked
- Randall County Subdivision Regulations (2023) (2026 county census)
- Amarillo Area Public Health District - On-Site Sewage Facility (2026 county census)
- Access Culvert / Driveway, quoted and re-checked
- On-Site Sewage Facility, 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
- Texas Local Government Code Chapter 233 — County Regulation of Housing and Other Structures, quoted and re-checked
- Texas Local Government Code Chapter 233 — County Regulation of Housing and Other Structures, quoted and re-checked
- Building Safety - City of Amarillo, quoted and re-checked
- Randall County Road & Bridge (randallcounty.gov)
- Plat Approval Form, quoted and re-checked
- 2023 Randall County Subdivision Regulations-Final, quoted and re-checked
- Amarillo Area Public Health District (City of Amarillo Environmental Health) (amarillo.gov)
- 2023 Randall County Subdivision Regulations-Final, quoted and re-checked
- On-Site Sewage Facility, quoted and re-checked
- amarillo.gov, quoted and re-checked
- Well Permitting, quoted and re-checked
- 2023 Randall County Subdivision Regulations-Final, quoted and re-checked
- Access Management Standards, quoted and re-checked
- Annual precipitation: Bolthole Index county data
- Share of years in severe drought: Bolthole Index county data
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
Written October 9, 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.