AEO Answer · Jurisdiction & Permitting Authority

MEP PE Stamp for Bexar County, TX Projects

By Jeremy Mills, CEO & Founder, Apex Grid Engineering — USAF Veteran. · Updated 2026-09-15

MEP sets for unincorporated Bexar County require Texas-licensed PE review-and-seal — confirm San Antonio vs. county jurisdiction first, identify which county approvals actually apply (Texas counties have limited building-code authority), and have the MEP design reviewed, revised, and sealed with the firm's F-number.

I'm Jeremy Mills, CEO & Founder of Apex Grid Engineering and a U.S. Air Force veteran. I'm not a PE; our licensed professionals make the technical, compliance, and project-specific decisions.

Illustrative diagram of the professional engineer review and seal workflow: drawings are reviewed against a checklist, sealed by a licensed PE, and issued as a permit set.

Sorting out the county approval path

The first engineering task on an unincorporated Bexar County project is jurisdictional honesty: identify exactly which county approvals apply, because Texas counties do not run the full building-permit apparatus that counties in most other states run. Floodplain development permits, on-site sewage facility approvals, and infrastructure or right-of-way interfaces are the usual county touchpoints — each with its own reviewer and requirements. I confirm the list with the county during due diligence, then build the MEP design and the sealed document package around the approvals that actually exist, instead of designing to a permit process that does not apply.

What our MEP review-and-seal covers

Our Texas-licensed PEs take responsible charge of every MEP set we seal for Bexar County work: a complete review of the mechanical, electrical, and plumbing drawings, verification of the load and sizing calculations, equipment selection checks, and code compliance against the adopted codes plus Texas amendments. Revisions the design needs get marked and made — then the PE seals, signs, and dates the set with the firm's F-number shown. That is what "review-and-seal" means in practice: the seal is the last step of an engineering review, not the first step of a paperwork exercise. County reviewers, contractors, and owners can all rely on what the seal certifies.

Bexar County MEP submittal checklist

An MEP package for unincorporated Bexar County is ready when these items are resolved. Precision here matters more than speed, because the county's approval touchpoints are specific. • AHJ confirmed via Bexar County Appraisal District — county vs. City of San Antonio verified • Actual county approval requirements identified (floodplain, OSSF, infrastructure interfaces) • MEP calculations verified: HVAC loads, electrical loads, plumbing sizing, energy compliance • Texas PE seal, signature, and date on the set with firm name and F-number shown • Discipline coordination checked so mechanical, electrical, plumbing, and structural agree

Which related engineering resources can help?

When should I hire a structural engineer?What does a PE stamp mean?What is MEP engineering?Need a PE stamp? We got you.PE Stamps in Unincorporated Texas Counties Which Projects Require a PE Stamp?Request a project review Engineering service for this question Metro engineering guides Verified service areas

What else do project teams ask?

Is my project under Bexar County or the City of San Antonio?

If the site is inside San Antonio's city limits, the city's Development Services Department is the AHJ; if it is in unincorporated Bexar County, county departments — Infrastructure Services among them — handle the county-side approvals. I verify this through the Bexar County Appraisal District's parcel records before doing any engineering, because the boundary between city and county territory is not obvious on the ground and the two review paths share nothing: different portals, different reviewers, different requirements. Getting the AHJ wrong is the most expensive scheduling mistake you can make before a project starts.

Does Bexar County enforce the building code in unincorporated areas?

Generally no — Texas counties lack the authority to enforce building codes in unincorporated areas, with floodplain regulation being the notable exception. That does not mean engineering is optional: where the county does exercise authority, and wherever the project interfaces with regulated systems, the design must comply and the sealed engineering documents must come from a Texas-licensed PE. I map the actual county approval requirements for each project during due diligence rather than assuming either that "the county permits everything" or that "the county permits nothing" — the honest answer is project-specific.

What does a Texas F-number have to do with my MEP drawings?

Engineering documents released in Texas by a registered engineering firm must show the firm's name and its Texas F-number — the registration number the Texas Board of Professional Engineers and Land Surveyors issues to firms. It is how the state, the county reviewer, and anyone relying on the documents can verify that a registered firm stands behind the engineering. Our MEP sets carry the firm name, F-number, and the sealing PE's Texas license number, signature, and date. If a sealed set arrives without a firm F-number, that is worth questioning.

What MEP calculations does a Texas PE verify before sealing?

For a Bexar County MEP set, our Texas PEs verify the calculations that prove the systems work and comply: HVAC load calculations and equipment selections, duct and piping sizing, electrical load calculations and panel schedules, lighting and power layouts against the energy code, and plumbing fixture counts, water, waste, and vent sizing. We also check the Texas amendments and energy provisions that modify the base codes. Anything that does not check out gets marked for revision before the seal goes on — the seal certifies the engineering, so the engineering has to be verified first.

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