Building permits, zoning and land rules in Portland, Texas

At a glance

Building permits

Required for structures and electrical, plumbing and mechanical work¹

Zoning

City zoning applies inside Portland municipal boundaries²

Sewer and septic

Subdivisions must connect to sewer unless the City finds it inaccessible³

RV living

Prohibited except in a legally leased RV-park space⁴

Manufactured-home size

Minimum 480 square feet; not a general minimum for every dwelling⁵

New-home processing

Building permit processing may take up to 15 business days⁶

Occupancy

Certificate of occupancy required for buildings intended to be occupied⁷

Who to call

Contact details are copied from each office’s official page and were checked against it on October 11, 2026.

Do you need a building permit in Portland, TX?

Portland requires a building permit to erect, alter or enlarge a structure, including a swimming pool or fence, and for installation, alteration, repair or replacement of electrical wiring, plumbing or mechanical equipment.¹ Portland’s construction plans must show property lines, building locations, easements and setback lines.¹ Portland adopted updated building codes effective in 2025; use the City’s adopted-code requirements when preparing a project.⁸ Portland requires inspections during construction and a final inspection before release for occupancy.⁹

Who issues building permits in Portland, and how do you apply?

Portland Building & Development Services is the city counter for building permits, planning and construction inspections, at 601 Moore Avenue Portland, Texas 78374; call 361-777-4550.¹⁰ Portland accepts building permit applications online or in person, and contractors must register with the City before construction activities.⁶ New construction plans are reviewed by Bureau Veritas under the City’s professional-services agreement.¹ New residential construction permits may take up to 15 business days; other permits typically take 2–5 business days.⁶ Portland publishes service fees in its Code of Ordinances Master Fee Schedule; ask Development Services for the building-permit charges for your project.¹¹

Does Portland have zoning, and can you live in an RV or tiny home?

Portland administers zoning and platting through its Planning and Zoning Division and Unified Development Ordinance.² Ask Portland Development Services to confirm the parcel’s zoning and whether your intended dwelling use fits before preparing building plans.¹⁰ Portland prohibits RV habitation or occupancy inside city limits except when the RV legally occupies a leased space in a Recreational Vehicle Park.⁴ Portland’s minimum size for mobile homes or manufactured housing is 480 square feet; that rule does not establish a minimum size for every dwelling type.⁵ We could not confirm a separate Portland tiny-home occupancy rule; ask Development Services about the proposed dwelling’s classification and zoning approval.²

How do septic permits work inside Portland?

Portland requires all subdivisions to connect to a sanitary sewer system, including taps for every lot, unless the City determines public sewer is inaccessible.³ When Portland finds sewer inaccessible, the applicant must comply with State and County laws for organized sewerage and on-site facilities.³ Texas generally requires a septic permit and approved plan to construct, alter, repair, extend or operate an on-site sewage facility.¹² We could not confirm the septic permit issuer for an address inside Portland; ask Development Services about sewer accessibility and contact the TCEQ OSSF Program for help identifying the applicable authority.³¹³ TCEQ cautions that it is often not the septic permitting authority.¹³

Building a home in Portland: what are the steps, in order?

1. Ask Portland Development Services to confirm the lot is properly platted and the intended use has the proper zoning.¹⁰ 2. Prepare building plans showing property lines, building locations, easements and setbacks, then submit the building permit application online or in person.¹⁶ 3. Confirm contractor registration before construction begins.⁶ 4. Arrange the required inspections throughout construction and the final inspection before occupancy.⁹ 5. Obtain Portland’s certificate of occupancy for the completed building before occupying it.⁷ Texas offers conditional owner-performed trade licensing exemptions for a qualifying residence or homestead, but we could not confirm a Portland owner-builder exemption from city building permits or contractor registration; ask Development Services before relying on an exemption.¹⁴⁶

What should you check before buying land in Portland?

For a Portland subdivision lot, resolve sanitary sewer accessibility with the City before planning an off-grid wastewater system; the City’s determination controls whether the on-site sewage alternative applies.³ San Patricio County’s soils data rates only 12.6% of county soils not limited for conventional septic drain fields; that countywide figure is not a Portland parcel evaluation and does not mean septic is impossible.¹⁵ If septic is applicable, Texas’s 10-acre exemption also requires a qualifying site evaluation, a single-family dwelling as the only dwelling, all system parts at least 100 feet from property lines, on-site disposal and no nuisance or groundwater pollution.¹² For land outside Portland, use the San Patricio County guide for the county’s unincorporated-area building and zoning answers.¹⁶¹⁷

Watch-outs

• Portland’s RV habitation exception is a legally leased RV-park space; do not assume a private building site qualifies for RV living while you build.⁴
• We could not confirm Portland-specific private-well, temporary-camping or agricultural-exemption rules; ask Development Services about your proposed use before buying.¹⁰
• Portland requires a certificate of occupancy for buildings or structures intended to be occupied.⁷

Sources

1. Permits (Portland), quoted and re-checked
2. Planning & Zoning (Portland), quoted and re-checked
3. portlandtx.gov (Portland), quoted and re-checked
4. portlandtx.gov (Portland), quoted and re-checked
5. Unified Development Ordinance, Manufactured Housing (Portland), quoted and re-checked
6. Permits (Portland), quoted and re-checked
7. Inspection & Certificate of Occupancy (Portland), quoted and re-checked
8. Adopted Code Amendments (Portland), quoted and re-checked
9. Inspection & Certificate of Occupancy (Portland), quoted and re-checked
10. Portland Building & Development Services (portlandtx.gov)
11. Utility Service Fees (Portland), quoted and re-checked
12. Getting a Permit for an OSSF - Such as a Septic System (Texas statewide rule), quoted and re-checked
13. Texas Commission on Environmental Quality OSSF Program (tceq.texas.gov)
14. Exemptions to Electrician Licensing (Texas statewide rule), quoted and re-checked
15. 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
16. San Patricio County Fire Code with Orders (2026 county census)
17. San Patricio County Subdivision Rules (2026 county census)

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.