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 requires a development permit for residential or commercial projects that disturb ground or add footprint, but has no general county zoning12. Collin County Development Services issues septic (OSSF) permits outside city limits; inside city limits, another authorized agent may handle septic permitting3. New homes require at least 3 third-party construction inspections4.

At a glance

Building / development permit
Required for any project that disturbs ground or adds footprint (new home, addition, pool)1
Zoning
None, outside limited uses (sexually-oriented business, salvage/junk yards, animal slaughter)5
Septic permits
Collin County Development Services outside city limits; another agent may serve city addresses3
RV / tiny home / manufactured home living
Not restricted by zoning, but a development permit still applies to ground-disturbing construction67
New home inspections
3 required third-party inspections (foundation, framing, final), not a county inspector4
OSSF minimum lot size
1 usable acre (1.5 acres if there's a water well) for lots divided in 2008 or later8
Development and septic fees
Development: $75; residential OSSF: $310 without maintenance or $335 with maintenance9

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 October 11, 2026.

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

Unincorporated Collin County requires a development permit for residential and commercial projects that disturb ground or add footprint, including new homes, additions, pools, fencing, grading, filling and new ponds110. Extensive dwelling remodels that add a bedroom or double the structure value also require permitting; re-roofing, roof-mounted solar, new electrical service on an existing structure, and water-heater or AC replacements do not10. The current development fee is $75, matching the FY2026 schedule; the FY2025 schedule listed $50 for new construction91112. Apply through the Citizen Self-Service Portal: paper applications are not accepted, invoices generally arrive in 2–4 business days, and review starts after payment and may take up to 30 days13. Inside Prosper and Royse City, which reaches into Collin County from Rockwall County, municipal offices handle building permits1415. County septic permitting applies outside city limits; Royse City’s Building Inspection Department receives OSSF applications inside that city316.

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

Collin County Development Services is the county development-permit office; reach it at 4690 Community Ave., McKinney, Texas, 75071, or (972) 548-558517. New residential dwellings and substantial remodels or additions require a qualified third-party inspector and at least 3 inspections: foundation before concrete, framing and mechanical systems before drywall, and completion; manufactured homes are excluded18. The builder must submit passing-final-inspection notice to Development Services and the owner, if different from the builder, within 10 days18. Commercial fire-code inspections go through the Fire Marshal’s Office under the 2021 International Fire Code and local amendments19. The county building-code document also lists 2009 commercial building, mechanical, plumbing, electrical and fuel-gas codes; residential structures must follow the County Seat’s adopted codes, so ask Development Services which residential edition applies20. Public pools must follow the most recent IBC and residential pools the most recent IRC20. Public Works handles culvert, driveway and right-of-way inspections17.

Does Collin County have zoning?

Unincorporated Collin County has no general zoning, with exceptions for sexually-oriented businesses, salvage and junk yards, and animal slaughter operations21. The county does not set home-size, lot-size, setback, lot-coverage or height limits by zoning, or restrict RVs, tiny homes, manufactured homes or accessory dwellings by zoning6. Prosper sets its own zoning, as do Richardson, which reaches into Collin County from Dallas County, and Royse City, which reaches in from Rockwall County222324. Septic authority is separate: Development Services serves land outside city limits, and another authorized agent may serve city addresses3. ETJ land remains in county permitting jurisdiction but may face city subdivision requirements; county OSSF suitability review still applies where a city has ETJ platting authority2526. Land divisions, re-subdivisions and combinations must follow county subdivision regulations where Collin County is the platting authority, unless exempt26.

How do septic permits work in Collin County?

Collin County Development Services issues OSSF permits outside city limits and applies a county Court Order stricter than the state minimum3. The published residential OSSF fee is $310 without maintenance or $335 with maintenance; review of existing septic is $509. Repairs or upgrades affecting 50% of a system require permitting as a new OSSF9. Lots divided between 1983 and 2008 need at least 1 acre, or 1.5 acres with a water well; lots divided in 2008 or later need 1 usable acre, or 1.5 acres total with 1 acre usable if there is a well8. Ask Development Services about exact boundary dates in 1983 or 20088. Only about 1% of county soils are rated free of severe limitations for conventional septic drain fields, making a site evaluation essential before choosing a system27. For a new structure connecting to a new OSSF, apply for the development permit first; staff send the associated OSSF application through your portal rather than requiring separate applications28. An OSSF permit expires after 365 days of inactivity28.

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

Collin County does not restrict RV, tiny-home or manufactured-home occupancy on unincorporated land through general zoning6. A tiny home that disturbs ground or adds footprint still needs a county development permit, and a new or altered septic system outside city limits needs a county OSSF permit128. We could not confirm whether alternative off-grid sanitation is allowed or whether a general private-well permit is required; ask Development Services before choosing either for a parcel17. A planned water well also changes the county’s septic lot-size requirements, so settle the water source before relying on a lot’s acreage8.

How do you build a home in Collin County?

  1. Confirm city-limit and ETJ status with Development Services: county development permitting applies to unincorporated land, including ETJ property, where city subdivision requirements may also apply1.
  2. Arrange a septic site evaluation before committing to a home layout; the county’s OSSF acreage requirements vary by division date and water-well presence8.
  3. Apply online for the development permit before ground disturbance; the development fee is $75, and staff send the associated OSSF application if the new home will connect to a new system9281.
  4. Contract a qualified third-party inspector for foundation, framing/mechanical and final inspections; submit passing-final-inspection notice within 10 days18.
  5. For a driveway onto a state highway, obtain a TxDOT permit using Form 1058; Public Works handles county culvert, driveway and right-of-way inspections2917.

What should you check before buying land in Collin County?

Before buying unincorporated Collin County land, verify septic suitability and the lot’s division date: county OSSF acreage requirements can prevent a small lot from supporting a new system8. Only about 1% of county soils are rated free of severe conventional-drain-field limitations, so do not choose a system from acreage alone27. County farmland value is about $13,066 per acre and typical home value about $486,570; these countywide figures do not price a particular parcel3031. The effective property-tax rate is about 1.7%, with a median annual bill around $7,432 and typical annual home-insurance premium around $3,041323334. Confirm subdivision and ETJ requirements before dividing or combining land, since exemptions and the platting authority depend on the property26.

Watch-outs

  • No general zoning does not remove Collin County’s development-permit requirement for ground disturbance or added footprint1.
  • Owner-builders still must contract with a third-party inspector for new dwellings and substantial residential remodels or additions; the county states no categorical owner-builder permit exemption35.
  • Confirm lot division dates and water-well plans with Development Services before assuming a parcel meets septic acreage requirements8.
  • We could not confirm certificate-of-occupancy requirements, agricultural permit exemptions or short-term-rental rules for unincorporated Collin County; ask Development Services before relying on any exemption or planned use17.

Sources

  1. collincountytx.gov, quoted and re-checked
  2. collincountytx.gov, quoted and re-checked
  3. Development Services: On Site Sewage Facilities, quoted and re-checked
  4. collincountytx.gov, quoted and re-checked
  5. collincountytx.gov (2026 county census)
  6. Texas law on county zoning and building authority
  7. Collin County Development Services FAQ (2026 county census)
  8. Collin County Development Services (On-Site Sewage Facilities / OSSF Program) (collincountytx.gov)
  9. Engineering: Development Services, quoted and re-checked
  10. Development Services Frequently Asked Questions, quoted and re-checked
  11. Adopted Fee Schedule FY 2026 - By Department, quoted and re-checked
  12. Adopted Fee Schedule FY 2025 - By Department, quoted and re-checked
  13. collincountytx.gov, quoted and re-checked
  14. Town of Prosper: Business in Prosper (Collin County), quoted and re-checked
  15. Royse City: Building Inspections (Collin County), quoted and re-checked
  16. Royse City: Application for On-Site Sewage Facility (Collin County), quoted and re-checked
  17. Collin County Development Services (collincountytx.gov)
  18. Development Services: Frequently Asked Questions, quoted and re-checked
  19. Commercial Applications, quoted and re-checked
  20. Building Codes, quoted and re-checked
  21. collincountytx.gov, quoted and re-checked
  22. Town of Prosper: Planning Forms (Collin County), quoted and re-checked
  23. Richardson: D-1400-M Duplex District Regulations, Sec. 2. Building regulations (Collin County), quoted and re-checked
  24. Royse City: official source (Collin County), quoted and re-checked
  25. collincountytx.gov, quoted and re-checked
  26. Engineering: Land Division Development, quoted and re-checked
  27. 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
  28. Development Services: On Site Sewage Facilities, quoted and re-checked
  29. Section 4: Driveway Permits, Design, and Materials (Texas statewide rule), quoted and re-checked
  30. Farmland value per acre (USDA census): Bolthole Index county data
  31. Typical home value (Zillow): Bolthole Index county data
  32. Effective property tax rate: Bolthole Index county data
  33. Median property tax bill: Bolthole Index county data
  34. Typical home insurance premium: Bolthole Index county data
  35. Development Services Frequently Asked Questions, quoted and re-checked

Written October 11, 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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Compared with neighboring counties

Like 5 of its 6 neighbors, Collin County has no countywide zoning.

RuleCollin CountyRockwall CountyGrayson CountyHunt CountyDallas CountyDenton CountyKaufman County
Building permitLimitedLimitedNot requiredNot requiredLimitedNot requiredLimited
County zoningNoNoNoNoNoYesNo
Septic permitsCounty Development ServicesCounty Env. Health CoordinatorCounty Development ServicesCounty Health Dept.County Health & Human ServicesCounty Public HealthCounty Development Services

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%Soils rated "not limited" for septic (strict USDA rating)
4,974 acWorkable land screen
29.9%Wooded land
33 tonsBiomass / forest ac
64.7°FAvg temp

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Cities and towns in Collin County

Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.

Not yet researched: Frisco · Josephine · Nevada · Town of New Hope · Parker · Weston

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 permitRequired

    New residential dwellings and substantially remodeled or added-to existing residential dwellings, excluding manufactured homes, in Collin County’s county-administered jurisdiction.

    • The builder must contract with a third-party inspector meeting one of the listed qualifications: licensed engineer, registered architect, Texas Real Estate Commission-licensed professional inspector, qualifying municipal plumbing inspector, qualifying political-subdivision building inspector, or International Code Council residential combination inspector.
    • The third-party inspector must perform no fewer than three inspections during construction: foundation before concrete placement; framing and mechanical systems before drywall or other interior wall covering; and completion of construction.
    • No later than the tenth day after the final inspection, the builder must submit passing-inspection notice to Development Services by email and to the person for whom the construction is being built if different from the builder.
    • The FAQ expressly excludes manufactured homes from this inspection requirement.

    minimum construction inspections: >= 3 inspections · passing inspection notice deadline: <= 10 days after final inspection

    “requires that anyone [...] contract with a 3rd party inspector”
    3 more reviewed findings 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.”
    • Limited — Residential and commercial property work in unincorporated Collin County.
      “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.”
    • Limited — Residential and non-residential building projects in unincorporated Collin County that disturb ground or add footprint on a parcel of land.
      “permitting is required for [...] projects that disturbs ground or adds footprint on a parcel of land.”
  • Owner-builder exemptionConditional

    A person building a new residential dwelling or substantially remodeling or adding to an existing residential dwelling in unincorporated Collin County

    • The official county FAQ does not state a categorical owner-builder permit exemption.
    • Anyone who builds a new residential dwelling or substantially remodels/adds to an existing residential dwelling must contract with a third-party inspector.
    • The inspector must be one of: a licensed engineer; a registered architect; a professional inspector licensed by the Texas Real Estate Commission; a plumbing inspector employed by a municipality and licensed by the Texas State Board of Plumbing Examiners; a building inspector employed by a political subdivision; or an individual certified as a residential combination inspector by the International Code Council.
    • The third-party inspector must perform no less than three inspections: foundation before concrete placement; framing and mechanical systems before drywall or other interior wall covering; and completion of construction.
    • No later than the tenth day after the final inspection, the builder must submit notice of the passing inspection stating compliance with applicable building-code standards to Development Services and to the person for whom the construction is being built, if different from the builder.
    “State law/County Court Order requires that anyone that builds a new residential dwelling or substantially remodels/adds to an existing residential dwelling contract with a 3rd party inspector:”
  • Building code adoptedPartial

    Commercial and residential structures, public swimming pools, and residential pools in unincorporated Collin County

    • For commercial structures, the county building-code document lists NFPA 101 Life Safety Code, 2009 IBC, 2021 IFC, 2009 IMC, 2009 IPC, 2009 NEC, and 2009 IFGC.
    • For residential structures inspected by independent inspectors, the document states that the structures must comply with adopted codes for the County Seat.
    • Public swimming pools must use the most recent IBC, and residential pools the most recent IRC.
    • For other structures not required to be permitted, the county strongly advises following all applicable building codes.
    • The building-code document is marked 'REVISED: 3/21/2013'; this revision stamp is not treated as an effective date.

    Commercial International Building Code: 2009 IBC · Commercial International Fire Code: 2021 IFC · Commercial International Mechanical Code: 2009 IMC · Commercial International Plumbing Code: 2009 IPC · Commercial National Electrical Code: 2009 NEC · Commercial International Fuel Gas Code: 2009 IFGC

    “BUILDING CODES Currently in Effect for Unincorporated Collin County [...] Commercial Structures: NFPA 101 Life Safety Code 2009 International Building Code (IBC) 2021 International Fire Code (IFC) 2009 International Mechanical Code (IMC) 2009 International Plumbing Code (IPC) 2009 National Electric Code (NEC) 2009 International Fuel Gas Code (IFGC) Residential Structures: (for Independent Inspectors) Must comply with adopted codes for the County Seat.”
    2 more reviewed findings on this topic
    • Partial — Commercial businesses, high-hazard operations, and fire detection and suppression systems in unincorporated Collin County
      “The Fire Marshal's Office conducts inspections on commercial businesses as well as high hazard operations and fire detection and suppression systems in the unincorporated (rural) areas of Collin County, per International Fire Code 2021. Collin County has adopted the 2021 International Fire Code and local amendments.”
    • Partial — Building-code requirements in unincorporated Collin County, including commercial structures inspected by the County Fire Marshal and residential structures inspected by independent inspectors.
      “BUILDING CODES Currently in Effect for Unincorporated Collin County [...] Commercial Structures: NFPA 101 Life Safety Code 2009 International Building Code (IBC) 2021 International Fire Code (IFC) 2009 International Mechanical Code (IMC) 2009 International Plumbing Code (IPC) 2009 National Electric Code (NEC) 2009 International Fuel Gas Code (IFGC) Residential Structures: (for Independent Inspectors) Must comply with adopted codes for the County Seat.”
  • 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.”
  • Local zoningAbsent (with conditions)

    Zoning restrictions in the unincorporated portions of Collin County, Texas.

    • The county states that exceptions apply for Sexually-Oriented businesses, Salvage and Junk Yards, and Animal Slaughter Operations.
    • The statement does not address zoning administered by incorporated municipalities within Collin County.
    • Separate permitting is required for residential and non-residential building projects that disturb ground or add footprint on a parcel of land.
    “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 Collin County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). 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 Collin County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). 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 Collin County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). 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 Collin County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). 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 Collin County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). 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 Collin County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). 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 Collin County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). 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 Collin County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). 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 Collin County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). 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 Collin County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). 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 Collin County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). 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 feesPublished

    Collin County Development Services permit fees for county-administered permits, including unincorporated-area development, health, and OSSF permits

    • The county's Development Services page publishes fee amounts by permit type.
    • The page lists Development at $75; health fees including Day Care $150, facilities from $300 to $600 depending on square footage, public/HOA pool inspection $200, and Temporary Event $40.
    • The same page lists OSSF fees of $450 or $475 for non-residential/commercial maintenance status, $100 or $150 for repairs/upgrades by line length, $310 or $335 for residential maintenance status, and $50 for septic review of existing septic.
    • If 50 percent of an OSSF will be repaired or upgraded, the county requires permitting as a New OSSF.
    • The page does not state an effective date for the displayed fee table.

    Development fee: 75 USD · Residential OSSF fee, no maintenance: 310 USD · Residential OSSF fee, maintenance: 335 USD · Commercial OSSF fee, no maintenance: 450 USD · Commercial OSSF fee, maintenance: 475 USD · OSSF repair or upgrade, less than 100 feet of line: 100 USD · OSSF repair or upgrade, more than 100 feet of line: 150 USD · Existing septic review: 50 USD

    “Development $ 75 [...] Residential (maintenance) $ 335 Residential (no maintenance) $ 310 Septic Review For Existing Septic $ 50 [...] ** If 50 % of the system will be repaired or upgraded, you will be required to permit as a New OSSF”
    2 more reviewed findings on this topic
    • Published — Development Services fees in the Collin County FY 2025 adopted fee schedule
      “Adopted Fee Schedule FY 2025 - By Department [...] Development Permit - New Construction $50.00 [...] Development Permit - Special Fee $25.00 Per lot [...] Re-Inspection Fee - Buildings $75.00”
    • Published — County Development Services permits for unincorporated Collin County.
      “Development Permit - New Construction $75.00 Comm. Ct Order 2009-384-05-27 This fee is a total amount comprised of the following fees: $20 Flood Plain Development Review fee [Water Code 16.315], $15 Lot Subdivision Check fee [LGC Ch. 232], $15 On-site Sewage Facility Compliance Review fee [Health & Safety Ch. 366]”
  • 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

  • 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.”
    One more reviewed finding on this topic
    • Limited — OSSFs using secondary treatment or drip irrigation in Texas.
      “A system using secondary treatment or drip irrigation must be inspected by a valid maintenance company once every four months, or be maintained by the single family homeowner, where allowed.”
  • Off-grid sanitationLimited

    Off-grid wastewater sanitation through an OSSF in Texas.

    • An OSSF generally requires a permit and approved plan before construction, installation, alteration, extension, repair, or operation.
    • A qualifying single-family dwelling on a tract of at least 10 acres may use the 10-acre permitting exemption only if every stated site-evaluation, setback, nuisance, groundwater, on-site disposal, and single-dwelling condition is met.
    • Local permitting authorities may impose requirements more stringent than state minimums.
    • Emergency repairs are exempt from permitting only for the listed repair types and must be reported in writing within 72 hours after repairs begin.

    10-acre exemption tract size: >= 10 acres (all TCEQ conditions must be satisfied) · 10-acre exemption OSSF setback: >= 100 feet from property line (all parts of the OSSF)

    “An OSSF may be exempt from permitting if it complies with all other requirements, including planning, construction, and installation standards of 30 TAC 285 AND meets the “10 acre rule”:”
    One more reviewed finding on this topic
    • Limited — Composting toilets used as on-site sewage facility treatment systems in Texas.
      “Composting toilets will be approved by the executive director provided the system has been tested and certified under NSF International Standard 41 (1999) or under any other standards approved by the executive director.”
  • Well permitLimited

    Drilling, equipping, operating, or completing a water well, or substantially altering a well or well pump, where the well is within a groundwater conservation district in Texas.

    • A groundwater conservation district must require a permit except as provided by Texas Water Code §36.117.
    • A district may not require a permit or permit amendment for maintenance or repair that does not increase production capability above the authorized or permitted production rate.
    • Permit applications must be in writing and sworn.
    • Whether a particular private well is exempt or subject to additional district requirements depends on the applicable groundwater conservation district's rules.

    permit application form: in writing and sworn

    “Except as provided by Section 36.117, a district shall require a permit for the drilling, equipping, operating, or completing of wells or for substantially altering the size of wells or well pumps.”
  • 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.”
    One more reviewed finding on this topic
    • Limited — County zoning authority over unincorporated land in Texas, where a specific statutory grant applies.
      “As you suggest, a county has very limited and specific zoning authority, and none that may be used to regulate construction or operation of the proposed facility.”
  • 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.”
    One more reviewed finding on this topic
    • Limited — County fire-code adoption and building-permit authority for specified buildings in unincorporated areas of qualifying Texas counties, including multifamily residential dwellings of four or more units.
      “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.”

Still unanswered

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

  • Certificate of occupancy — Certificate-of-occupancy requirements in unincorporated Collin County.
  • Mandatory utility hookup — Water and sewer utility connection requirements for development in Collin County.
  • Agricultural exemption — Agricultural exemptions from Collin County development, building, or OSSF permitting.
  • Short-term rentals — Short-term rental regulation in Collin County.

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). Owner-builders may act as their own contractor to build their home. 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 Collin County has adopted no county zoning ordinance (Texas law lets some counties zone, but this one has not). 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.

How Collin compares in Texas

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