Collin County — Texas's fastest-growing large county — is home to Plano, Frisco, McKinney, Allen, and other booming cities that handle their own permitting. For unincorporated areas, Collin County Engineering and the Fire Marshal's Office handle development and commercial building permits under Texas Local Government Code Chapter 233.
This guide covers unincorporated Collin County permit requirements, jurisdiction verification, and the county's role.
Most of Collin County is within incorporated cities. Plano, Frisco, McKinney, Allen, Prosper, and other cities handle their own permitting. Collin County's authority in unincorporated areas is limited under Texas law. Verify your property's jurisdiction before applying.
What requires a building permit in Collin County?
In unincorporated Collin County, permits may be required for:
Permit required
- Commercial and public-accessible construction
- Multi-family residential
- Development activities and site work
- Floodplain development
- On-site sewage facilities (OSSF)
- Road and drainage work
Typically exempt
- Single-family residential (limited county authority)
- Interior cosmetic work
- Agricultural buildings in certain cases
Exemptions are narrow and scope-specific. When unsure, confirm with the building department before starting — see the penalty note below.
Get the permit issued before starting work. Building without one exposes the owner to penalties and stop-work orders. Note that exemption from a building permit does not exempt a project from zoning requirements — confirm edge cases with the building department.
Who handles permitting in Collin County?
Collin County Engineering handles development permits and site-related approvals. The Fire Marshal handles commercial building permits in unincorporated areas.
| Detail | Information |
|---|---|
| Office | Collin County Engineering |
| Phone | (972) 548-4104 |
| Covers | Unincorporated Collin County |
| Scope | Commercial, development, floodplain, OSSF |
| Note | Most area is within incorporated cities |
| Website | collincountytx.gov |
Verify jurisdiction first. Most Collin County construction occurs within incorporated cities that handle their own permitting. For unincorporated areas, contact Collin County Engineering at (972) 548-4104.
Collin County building permit cost
Collin County permit fees vary by project type. Contact Engineering at (972) 548-4104 for current fees.
| Fee component | How it works |
|---|---|
| Development permit | Per county fee schedule |
| Commercial building permit | Per Fire Marshal schedule |
| OSSF permit | Separate fee |
| Floodplain permit | Separate fee |
Want a precise number for a specific Collin County project? Send us the scope and valuation and we'll return a fee estimate alongside a filing timeline.
Collin County trade permits
State trade licenses apply.
Electrical permits
TDLR-licensed electrician required.
Plumbing permits
TSBPE-licensed plumber required.
Mechanical (HVAC) permits
TDLR-licensed mechanical contractor required.
Miscellaneous & specialty
Collin County's rapid growth means jurisdiction boundaries change frequently as cities annex territory. Always verify current jurisdiction.
Verify your contractor's license. Texas licenses electricians (TDLR), plumbers (TSBPE), and HVAC/mechanical contractors (TDLR) at the state level — contractors must register with the local municipality before pulling permits. Texas does not issue a statewide general-contractor license. Projects over $50,000 require a TDLR project number and accessibility review. The property owner is responsible for ensuring a permit is obtained. Verify trade licensure at tdlr.texas.gov and tsbpe.texas.gov.
How to get a building permit in Collin County
Verify jurisdiction
Confirm the property is in unincorporated Collin County, not within Plano, Frisco, McKinney, or another city.
Contact County Engineering
Call (972) 548-4104 to determine permit requirements for your project.
Submit application
Provide required documents per county guidelines.
Review & approval
County reviews the application.
Pay fees & receive permit
Pay all fees.
Schedule inspections
Contact the county for inspections.
Inspections in Collin County
Contact Collin County Engineering for inspection scheduling in unincorporated areas.
Address correction notices before requesting a re-inspection; a final inspection and Certificate of Occupancy are required before legal occupancy or use.
Official Collin County permitting resources
Simplify Collin County permitting with Alliance Permitting
Collin County's rapid growth and complex jurisdiction map reward applicants who verify jurisdiction before applying. Alliance Permitting is a permit expediter for Collin County — our permit expediting services pair AI-driven document review with experts who know the Collin County Engineering / Fire Marshal process, so your Collin County submissions move faster.
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Contractors and builders choose Alliance for Collin County because we deliver:
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Alliance Permitting is a permit documentation and submission company: we prepare your paperwork, file it correctly, and coordinate with the building department through issuance — including preparing private-provider documentation where that option is available. We are not a contractor and do not perform licensed plan review or inspections; that work stays with your team and the jurisdiction.
Need a Collin County building permit?
Get your Collin County project permitted correctly. Alliance Permitting verifies jurisdiction and handles applications.
More Texas permitting guides
This guide is provided by Alliance Permitting for general informational purposes and reflects publicly available information believed accurate as of June 2026. Permit requirements, fees, and processes change; always confirm current details with the Collin County Engineering before filing. This is not legal advice.