Bolthole Index

Collin County, Texas

Building permits, zoning and septic rules in Collin County, Texas

43Index Score / 100
#177 of 254 in Texas

Unincorporated Collin County, Texas has no zoning ordinance for residential land, but it still requires a development permit for any project that disturbs ground or adds footprint, including a new home, an addition, or a pool12. Septic systems (OSSFs) outside city limits are also permitted by the county itself, not the state, under rules stricter than Texas's minimums34. New residential construction gets checked by a licensed third-party inspector at three stages, not by a county building inspector5.

At a glance

Building / development permit
Required for any project that disturbs ground or adds footprint (new home, addition, pool)2
Zoning
None, outside limited uses (sexually-oriented business, salvage/junk yards, animal slaughter)1
Septic permits
Issued by Collin County Development Services, TCEQ's authorized agent for the county3
RV / tiny home / manufactured home living
Not restricted by zoning, but a development permit still applies to ground-disturbing construction62
New home inspections
3 required third-party inspections (foundation, framing, final), not a county inspector5
OSSF minimum lot size
1 usable acre (1.5 acres if there's a water well) for lots divided in 2008 or later4
OSSF permit expiration
Expires after 365 days with no activity on the permit4
Driveway onto a state highway
Needs a TxDOT permit (Form 1058), not a county permit7

Who to call

Building permits

Collin County Development Services

Development permits for any project that disturbs ground or adds footprint outside city limits, addressing of raw land, ETJ/floodplain verification for permits, plat sign-off, and directing culvert/driveway/right-of-way inspections to Public Works. Commercial building inspections go through the Fire Marshal's Office instead.

(972) 548-5585

4690 Community Ave., McKinney, Texas, 75071

Online permits →

Septic permits

Collin County Development Services (On-Site Sewage Facilities / OSSF Program)

OSSF (septic) permitting for property outside city limits, acting as TCEQ's authorized agent under a county Court Order that is stricter than the state's minimum OSSF rules.

(972) 548-5585

4690 Community Ave., McKinney, Texas, 75071

Online permits →

Contact details are copied from each office’s official page and were checked against it on September 24, 2026.

Do you need a building permit in Collin County, Texas?

Unincorporated Collin County has no zoning, but it does require a development permit before you build a new home, add an addition, install a pool, or do anything else that disturbs ground or adds footprint on a parcel of land25. Re-roofing, HVAC replacement, and electrical upgrades on an existing structure are exempt from that permit2. This is unusual for a Texas county: most rural counties cannot require a building permit at all, but Collin County's development-permit process covers construction impact even without zoning1. If your property sits inside a city's extraterritorial jurisdiction (ETJ), that city's own subdivision rules can also apply on top of the county's permit, and you will need an ETJ Verification form signed by the city before the county will issue your permit5.

Who is the Collin County building department, and how do you reach them?

Collin County Development Services issues development permits, addresses raw land only as part of the permitting process, verifies ETJ and floodplain status, and signs off on plats5. Reach the office at 4690 Community Ave. in McKinney, Texas, by phone at (972) 548-55855. New residential construction also requires 3 inspections by a licensed third-party inspector rather than a county building inspector: at the foundation stage before concrete is placed, at the framing and mechanical stage before drywall goes up, and at completion of the residence5. The builder must submit notice of a passing final inspection to Development Services, and to the property owner, no later than the 10th day after that final inspection5. For culvert, driveway, or right-of-way inspections on a county road, or for commercial building inspections, Development Services routes you to Public Works or the Fire Marshal's Office instead5.

Does Collin County have zoning?

No, with narrow exceptions: Collin County has no zoning ordinance in unincorporated areas apart from limited rules for sexually-oriented businesses, salvage and junk yards, and animal slaughter operations1. Because there is no general zoning, the county does not set a minimum home size, minimum lot size, setback, lot-coverage limit, or building-height limit by zoning, and it does not restrict RVs, tiny homes, manufactured homes, or accessory dwellings on a parcel by zoning6. That does not mean construction is unregulated: the development-permit rule above still applies to any project that disturbs ground or adds footprint, regardless of zoning2. If your land is inside a city's ETJ, that city's subdivision regulations can add requirements the county's own rules do not, so confirm ETJ status before you assume county-only rules apply5.

How do septic permits work in Collin County?

Property outside city limits in Collin County needs an OSSF permit through the county's own Development Services department, which acts as TCEQ's authorized agent rather than leaving permitting to a TCEQ regional office34. Collin County's Court Order adds stricter local rules on top of the state's OSSF standards, so a plan that only meets the state minimum may still fall short of what the county requires3. Lot size matters directly: a lot divided between 1983 and 2008 needs at least 1 acre (1.5 acres if there's a water well on the property), and a lot divided in 2008 or later needs at least 1 usable acre (1.5 acres minimum, with 1 acre usable, if there's a water well)4. Only about 1% of Collin County's soils are rated free of severe limits for a conventional septic drain field, so budget for a site evaluation and likely an engineered or aerobic system on almost any lot8. An issued OSSF permit expires after 365 days of no activity, so don't let a permitted project sit too long before you start4.

Can you live in an RV or tiny home on your land in Collin County?

Collin County's lack of general zoning means the county does not restrict RV, tiny-home, or manufactured-home occupancy on unincorporated land by zoning ordinance6. That is not the same as an unregulated parcel: any new structure, including a tiny home on a foundation, still triggers the county's development-permit requirement because it disturbs ground or adds footprint, and any wastewater still needs a permitted OSSF or a connection to sewer23. Collin County is also one of the fastest-growing and most built-up counties in the state, at roughly 1,420.9 people per square mile and only about 6 miles from the nearest metro area, so genuinely rural, off-grid-style land here is scarce and often already inside a city's ETJ910.

Building a home in Collin County: the steps, in order

  1. Confirm whether your parcel is unincorporated, inside a city's limits, or inside a city's ETJ using the county's interactive maps, since ETJ land needs an additional city sign-off before the county will permit it5.
  2. Apply for your development permit through the Collin County Citizen Self-Service Portal before you disturb ground or add footprint; if you'll also need a new OSSF, apply for the development permit first and Development Services will issue the associated OSSF permit through the same portal54.
  3. Line up your septic site evaluation early if you're outside city sewer: a lot divided in 2008 or later needs at least 1 usable acre, or 1.5 acres with 1 acre usable if there's a water well, and only about 1% of county soils are free of severe septic limits48.
  4. Contract a licensed third-party inspector before construction starts; the county requires 3 inspections (foundation, framing/mechanical, final) instead of a county building inspector5.
  5. If your driveway connects to a state highway rather than a county or city street, apply for a TxDOT permit (Form 1058) before you build it7.

What to check before you buy land in Collin County

Septic capacity is the biggest constraint: only about 1% of Collin County's soils are rated free of severe limits for a conventional drain field, so assume you'll need an engineered or aerobic system and get a site evaluation before you make an offer8. Land here is expensive and in demand: farmland has recently been valued around $13,066 an acre, and the typical home value is about $486,5701112. The county is genuinely urban by rural-land standards, at about 1,420.9 people per square mile and roughly 6 miles from the nearest metro area, which supports quick access to services but leaves little truly quiet acreage910. Expect higher carrying costs too: the effective property tax rate runs about 1.7%, with a median bill around $7,432 a year, and a typical home insurance premium runs about $3,041 a year131415. Annual precipitation averages 41.1 inches with the area in severe drought about 19.2% of recent years, wetter and less drought-prone than most of Texas, which helps both a well and a septic drain field1617.

Watch-outs

  • Collin County's development-permit process is not the same as zoning: even though there's no zoning, ground-disturbing construction still needs a permit, and skipping it is not a gray area the way it is in a truly no-permit rural county2.
  • If any part of your parcel sits in a city's ETJ, get the city's ETJ Verification form before you apply to the county; Development Services will not issue a permit without it5.
  • Confirm your exact acreage and whether a water well is planned before assuming your lot qualifies for OSSF use; the minimum acreage differs by when the lot was divided and by well presence4.

Sources

  1. Development Services Frequently Asked Questions (2026 county census)
  2. Development Services Frequently Asked Questions (2026 county census)
  3. Development Services: On Site Sewage Facilities (2026 county census)
  4. Collin County Development Services (On-Site Sewage Facilities / OSSF Program) (collincountytx.gov)
  5. Collin County Development Services (collincountytx.gov)
  6. Texas law on county zoning and building authority
  7. Section 4: Driveway Permits, Design, and Materials (Texas statewide rule), quoted and re-checked
  8. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  9. Population density: Bolthole Index county data
  10. Distance to the nearest metro area: Bolthole Index county data
  11. Farmland value per acre (USDA census): Bolthole Index county data
  12. Typical home value (Zillow): Bolthole Index county data
  13. Effective property tax rate: Bolthole Index county data
  14. Median property tax bill: Bolthole Index county data
  15. Typical home insurance premium: Bolthole Index county data
  16. Annual precipitation: Bolthole Index county data
  17. Share of years in severe drought: Bolthole Index county data

Written September 24, 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.

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County locator

Collin County in Texas

43
County map
Collin County highlighted among the Texas counties · colored by Index score

How Collin County scores

Seclusion14100% ev.
Self-Sufficiency55100% ev.
Admin Boringness7490% ev.
Durability49100% ev.
Property Autonomy71100% ev.
Carry Cost41100% ev.

Evidence strength: 98%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$487kTypical home
1.7%Property tax
$13,066Land / acre
41.1"Annual rain
19.2% of yrsSevere drought
36.1 / yr (+24.5)Mid-century 100°F days
22.6 daysMid-century dry spell
2.41" (+6%)Mid-century 1-day rain
1.38×Wildfire change factor
100%Forward climate coverage
$3,041Home insurance / yr
5.3% / yrInsurance growth
0%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
110,266People within 30 min
8,750,491People within 2 hr
381,933Radius comparison (15 mi)
1,420.9People / sq mi
7%Federal land
100%Land at 15% slope or less
1%Septic soil without severe limits
4,974 acWorkable land screen
29.9%Wooded land
33 tonsBiomass / forest ac
64.7°FAvg temp

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Answers from the rulebook for Collin County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Collin County rules

  • Building permitLimited

    Residential and commercial property work in unincorporated Collin County.

    • Permits are required for projects that disturb ground or add footprint, including new structures, additions, swimming pools, fencing, grading or filling, and new ponds.
    • Extensive dwelling remodels that add a bedroom or otherwise double the structure value require permitting.
    • Re-roofing, new electrical service on an existing structure, roof-mounted solar panels, water-heater or AC-unit change-outs, and listed similar work do not require permits.
    • For new structures connecting to a new OSSF, apply for the development permit first; the county then sends the associated OSSF permit.
    “Only projects that will result in disturbance of ground or addition of footprint on a parcel of land will require a permit (for example - a new structure, an addition, swimming pools, fencing, grading/filling, a new pond, etc.) or an extensive remodel of a dwelling structure that adds a bedroom or otherwise doubles the value of the structure require permitting.”
    One more reviewed finding on this topic
    • Limited — Residential and non-residential building projects in the unincorporated portions of Collin County that disturb ground or add footprint on a parcel of land.
      “However, permitting is required for residential and non-residential building projects that disturbs ground or adds footprint on a parcel of land. Anyone planning any type of residential or commercial project (that disturbs ground or adds footprint on a parcel of land) in the unincorporated County must apply for a permit through the Collin County Citizen Self-Service Portal.”
  • InspectionsRequired

    New residential dwellings and substantial remodels or additions to existing residential dwellings in the county permitting jurisdiction.

    • A third-party inspector must be a licensed engineer, registered architect, TREC-licensed professional inspector, qualifying plumbing inspector, qualifying building inspector, or ICC-certified residential combination inspector.
    • At least three inspections are required: foundation before concrete; framing and mechanical systems before drywall or other interior wall covering; and completion of construction.

    minimum construction inspections: >= 3 inspections

    “The 3rd party inspector is required to perform no less than 3 inspections during construction:”
  • County-wide zoningAbsent (with conditions)

    Zoning restrictions in unincorporated portions of Collin County.

    • Exceptions stated by the county are Sexually-Oriented business, Salvage and Junk Yards, and Animal Slaughter Operations.
    • Permitting is separately required for residential and non-residential building projects that disturb ground or add footprint.
    “Collin County does not, at this time, have any zoning restrictions in the unincorporated portions of the County, with the exception of Sexually-Oriented business, Salvage and Junk Yards and Animal Slaughter Operations.”
  • Zoning districts · by state lawNo county rule

    Unincorporated Collin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Collin County has no zoning ordinance. Collin County's own reviewed answer confirms it has no county-wide zoning.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Minimum dwelling size · by state lawNo county rule

    Unincorporated Collin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Collin County has no zoning ordinance. Collin County's own reviewed answer confirms it has no county-wide zoning.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Minimum lot size · by state lawNo county rule

    Unincorporated Collin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Collin County has no zoning ordinance. Collin County's own reviewed answer confirms it has no county-wide zoning.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Setbacks · by state lawNo county rule

    Unincorporated Collin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Collin County has no zoning ordinance. Collin County's own reviewed answer confirms it has no county-wide zoning.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Lot coverage · by state lawNo county rule

    Unincorporated Collin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Collin County has no zoning ordinance. Collin County's own reviewed answer confirms it has no county-wide zoning.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Building height · by state lawNo county rule

    Unincorporated Collin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Collin County has no zoning ordinance. Collin County's own reviewed answer confirms it has no county-wide zoning.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Living in an RV · by state lawNo county rule

    Unincorporated Collin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Collin County has no zoning ordinance. Collin County's own reviewed answer confirms it has no county-wide zoning.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Camping on your land · by state lawNo county rule

    Unincorporated Collin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Collin County has no zoning ordinance. Collin County's own reviewed answer confirms it has no county-wide zoning.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Tiny homes · by state lawNo county rule

    Unincorporated Collin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Collin County has no zoning ordinance. Collin County's own reviewed answer confirms it has no county-wide zoning.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Manufactured homes · by state lawNo county rule

    Unincorporated Collin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Collin County has no zoning ordinance. Collin County's own reviewed answer confirms it has no county-wide zoning.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Accessory dwellings · by state lawNo county rule

    Unincorporated Collin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Collin County has no zoning ordinance. Collin County's own reviewed answer confirms it has no county-wide zoning.

    • Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits.
    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • Who permits septicCounty (with conditions)

    OSSF permitting for property outside city limits in Collin County.

    • Collin County applies state OSSF rules plus a county Court Order with additional, more stringent rules.
    • Inside city limits, the county page states that another authorized agent may administer OSSF permitting.
    “If your property is located outside of city limits - you are required to apply for an OSSF permit through the collin county citizen self-service portal.”
  • Septic permitRequired

    New or altered OSSFs for property outside city limits.

    • For a new structure connecting to a new OSSF, the development permit must be applied for first and the associated OSSF permit is then sent through the portal.
    • OSSF permits expire after 365 days of no activity from issuance.
    • County rules supplement state rules.

    permit inactivity expiration: 365 days (from date of issuance)

    “If you are building a new structure that will connect to a new ossf, then apply for your development permit first and staff will then send an associated ossf permit through your portal to be completed by you. do not apply for a separate development permit and ossf permit.”
  • Subdividing landRegulated (with conditions)

    Division, re-subdivision, or combination of land where Collin County is the platting authority.

    • Exemptions may apply under Texas Local Government Code Chapter 232 and Collin County Subdivision Regulations.
    • Properties in a city's ETJ may be subject to that city's platting authority, except for the county OSSF suitability review.
    “The Collin County Subdivision Regulations, as directed by Chapter 232 of the Local Government Code (LGC) states that any tract of land that is divided into two (2) or more parts, or any re-subdivision or combining of all or part of any previously platted and recorded subdivision, or any combining of all or part of any previously non-platted tract of land shall adhere to the requirements of the Collin County Subdivision Regulations, unless exempt in accordance with Chapter 232 of the LGC and the Collin County Subdivision Regulations.”
  • Permit processPublished (with conditions)

    New Collin County permit and plan applications.

    • Applications must be submitted online through the CSS Portal; paper applications are not accepted.
    • After submission, staff review the application; if approved, an invoice is issued in approximately 2-4 business days.
    • Review does not begin until all fees are paid; review may take up to 30 days.
    • Approved permits can be printed from the portal; rejected applications receive notes identifying next steps.

    invoice intake processing: 2-4 business days · review duration: up to 30 days

    “All New permit and New plan applications need to be applied for online through the CSS Portal. The online portal will streamline these processes through digital plan review, online permit and plan applications, online payments and online inspection requests with real-time status of your transactions available in the portal. Paper form applications will no longer be accepted.”

Texas rules that apply here

  • Building code adoptedPartial

    Industrialized housing and buildings, modules, and modular components governed by the Texas Industrialized Housing and Buildings program.

    • The mandatory state code adoption applies to industrialized housing and buildings, modules, and modular components, not all construction statewide.
    • The effective date is July 1, 2024.
    • The International Existing Building Code applies to alterations of portable industrialized buildings.
    • Manufacturers already certified for Texas must have design-package documents reviewed and approved to the new editions with an approval date on or after July 1, 2024, unless the manufacturer elected to transition before the effective date under Department rule 70.70(a)(5)(B).
    • Construction begun on or after July 1, 2024 must comply with the new code editions and approved design packages.
    • Construction begun before July 1, 2024, or before a manufacturer's effective transition date, must meet the stated completion, inspection, and labeling deadline to remain eligible for a Texas decal.

    effective date: 2024-07-01 · International Building Code: 2021 Edition (including appendices C, F, and K) · International Residential Code: 2021 Edition (including appendices AG, AH, AK, AP, AQ, and AT) · International Fuel Gas Code: 2021 Edition · International Mechanical Code: 2021 Edition · International Plumbing Code: 2021 Edition · International Energy Conservation Code: 2015 Edition · National Electrical Code: 2020 Edition · International Existing Building Code: 2021 Edition (for alterations of portable industrialized buildings)

    “July 1, 2024, all industrialized housing and buildings, modules, and modular components shall comply with the following codes, as amended in §70.101 of the IHB Rules:”
  • Septic inspectionLimited

    OSSF installation and, where applicable, maintenance inspections in Texas

    • Authorized agents or their designated representatives inspect system installation.
    • Some permitting authorities impose more stringent requirements.
    • Maintenance-provider inspection and reporting requirements apply to systems and circumstances governed by 30 TAC §285.91(4).
    • Electronic monitoring may reduce reporting to every six months where the stated monitoring conditions apply.

    reduced maintenance reporting interval with qualifying electronic monitoring: 6 months (only where the system uses the specified electronic monitoring, automatic notification, and disinfection monitoring)

    “Many times, the AA has a "designated representative" (DR) to assist them with their responsibilities, which include reviewing plans for constructing, altering, extending or repairing each OSSF; issuing permits; and inspecting system installation. [...] If the system uses an electronic monitor, automatic radio or telephone to notify the maintenance provider of system or component failure and to monitor the amount of disinfection in the system, reporting may be reduced to every six months.”
  • Driveway accessRequired

    New or modified access driveways connecting property to a Texas state highway right of way.

    • A local public agency may receive access driveway permitting authority for state highways, but TxDOT approval remains required for drainage impacts on the state highway system before local approval.
    • No access driveway is permitted within a flared or widened right-of-way section at an intersection of a state highway with another highway, road, or street.
    • All entrances and exits, including radii, must be confined within the permittee's property frontage.
    • One-way 45-to-90-degree driveways are permitted for connections to one-way frontage roads or lane-divided highways; otherwise the driveway angle must be 75 to 90 degrees.
    • ADAAG and Texas Accessibility Standards apply.

    private residential driveway maximum width: <= 24 feet (Except as increased by permissible radii.) · driveway-to-pavement radius: >= 15 feet

    “A driveway must be constructed in accordance with a fully executed driveway permit”
  • county zoning authorityLimited

    Texas counties adopting zoning regulations for specified unincorporated or otherwise specially defined areas.

    • Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters.
    • For Padre Island, the authority applies in Cameron or Willacy County outside a municipality and within two miles of a publicly owned park or recreational development, or within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.
    • Other Chapter 231 subchapters address special areas including the Amistad Recreation Area in Val Verde County, military zones, certain lakes, the El Paso Mission Trail Historical Area, Lake Somerville, and Falcon Lake in Zapata County.
    • The cited statute was enacted effective September 1, 1987; the Falcon Lake subchapter was added effective June 15, 2007, and amended effective September 1, 2009.

    Padre Island distance from publicly owned park or recreational development: <= 2 miles (Area must be outside a municipality and in Cameron or Willacy County.) · Padre Island distance from beach, wharf, or bathhouse: <= 2 miles (The beach, wharf, or bathhouse must be used by at least 500 persons annually.)

    “This subchapter applies to the areas of Padre Island located in Cameron or Willacy County and located: (1) outside a municipality but within two miles of a publicly owned park or recreational development; or (2) within two miles of a beach, wharf, or bathhouse used by at least 500 persons annually.”
  • county building authorityLimited

    Texas counties adopting and enforcing fire-code building permits for specified buildings in unincorporated areas and applying residential building-code standards in certain counties.

    • Under Section 233.061, the county must have a population over 250,000 or be adjacent to a county with a population over 250,000.
    • Under Section 233.062, the fire code applies only to commercial establishments, public buildings, and multifamily residential dwellings consisting of four or more units constructed in an unincorporated area.
    • The fire code does not apply to an industrial facility having a fire brigade that conforms to Occupational Health and Safety Administration requirements.
    • A covered applicant must submit a plan and a commissioners-court-set application fee; the county must issue or deny the permit within 30 days, and failure to act within 30 days approves the construction for purposes of the subchapter.
    • The fire code must conform to the International Fire Code or Uniform Fire Code as those codes existed on May 1, 2005, or establish protective measures exceeding those standards; later editions may be adopted.
    • Residential standards under Section 233.152 apply only if the county adopts a resolution or order and the county is within 50 miles of an international border or has a population over 100.
    • Those residential standards apply only to new single-family-house or duplex construction beginning after September 1, 2009; manufactured or modular structures governed by Occupations Code Chapters 1201 or 1202 are excluded from the definition of new residential construction.
    • A municipality's building code controls in its extraterritorial jurisdiction, and Section 233.152 does not authorize county prior approval of new residential construction or county zoning regulations.
    • Fire-code inspection and permit fees may be charged under a fee schedule based on building type, limited to amounts necessary to administer and enforce the subchapter; inspection fees must be reasonable and reflect approximate inspection costs.

    county population threshold for fire-code authority: > 250000 persons (A county adjacent to a county over 250,000 also qualifies.) · multifamily residential dwelling threshold: >= 4 units (The fire code applies only to covered buildings constructed in an unincorporated area.) · residential-code border distance: <= 50 miles (Alternative qualification is county population over 100.) · application decision period: 30 days (If the commissioners court does not issue or deny the permit within 30 days after receiving the application and fee, construction is approved for purposes of the subchapter.) · residential standards effective construction date: > 2009-09-01 (Applies only to new residential construction that begins after September 1, 2009.)

    “The commissioners court of a county with a population of over 250,000 or a county adjacent to a county with a population of over 250,000 may adopt a fire code and rules necessary to administer and enforce the fire code. [...] The fire code applies only to the following buildings constructed in an unincorporated area of the county: (1) a commercial establishment; (2) a public building; and (3) a multifamily residential dwelling consisting of four or more units.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Owner-builder exemption — Owner-builder exemption from Collin County construction permitting or inspection requirements.
  • Certificate of occupancy — Certificate-of-occupancy requirements in unincorporated Collin County.
  • Off-grid sanitation — Off-grid sanitation systems in unincorporated Collin County.
  • Well permit — Private water-well permitting in Collin County.
  • Mandatory utility hookup — Water and sewer utility connection requirements for development in Collin County.
2 more unanswered
  • Agricultural exemption
  • Short-term rentals

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Water rights & wells in Collin County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from Texas’s water agency.

Actively managed

This basin is under active state management — new water use is scrutinized, though a domestic well is usually still allowed.

Household wellExempt up to a limit

Texas groundwater is governed by the rule of capture; a Groundwater Conservation District must exempt qualifying domestic/livestock wells and may not restrict their production, but well registration and spacing rules can still apply and the exemption does not cover wells serving a platted subdivision.

Limit: Domestic/livestock well exempt from GCD production permitting if on a tract >10 acres AND incapable of producing >25,000 gal/day (Tex. Water Code §36.117)

Texas Water Code §36.117 / TWDB ↗
  • North-Central Texas Trinity & Woodbine Aquifers Priority Groundwater Management Areapartial of county

    TCEQ-designated DFW-region Trinity/Woodbine critical-groundwater area; drives GCD coverage. Domestic/livestock wells remain exempt but spacing/registration may apply.

    TCEQ — Priority Groundwater Management Areas ↗

Hybrid state (appropriation + riparian). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the Texas state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Collin County, Texas

Is Collin County a good place to live off-grid or homestead?

Collin County scores 43/100 on the Bolthole Index, a marginal county profile. Its strengths: low administrative friction for a quiet rural property and a stronger property-autonomy legal backdrop. Watch-outs: about 110,266 people within a 30-minute drive and higher long-term carry cost.

Do you need a building permit in Collin County, Texas?

Collin County requires a building permit only in limited cases (such as floodplains or specific zones), and it has no county-wide zoning. Onsite septic is permitted by Collin County Development Services (TCEQ Authorized Agent). These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

Can you live in an RV or tiny home on your land in Collin County?

Living in an RV on your own land in Collin County is allowed: Unincorporated Collin County: no county rule sets this, because Texas law gives zoning power only to certain counties, and Collin County has no zoning ordinance. Collin County's own reviewed answer confirms it has no county-wide zoning. Septic, floodplain, subdivision and health rules still apply; cities and towns set their own rules inside their limits. Chapter 231 does not grant a general statewide county zoning power; authority is provided through geographically or subject-matter limited subchapters. A tiny home is allowed. Confirm with the county before relying on it.

How much does land cost in Collin County, Texas?

Land in Collin County runs about $13,066 per acre, based on the latest county data.

What is the water situation in Collin County?

Collin County gets about 41.1" of rain a year, with severe drought in roughly 19.2% of years. On water rights, Collin County lies in the North-Central Texas Trinity & Woodbine Aquifers Priority Groundwater Management Area — TCEQ-designated DFW-region Trinity/Woodbine critical-groundwater area; drives GCD coverage. Domestic/livestock wells remain exempt but spacing/registration may apply..

How remote is Collin County?

A representative private-land location has about 110,266 people within a 30-minute drive and 8,750,491 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

Off-grid gear

Going off-grid in Collin County means bringing your own water and power. The kit we’d start with:

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How Collin compares in Texas

Compare side-by-side →See all 254 Texas counties ranked →