AEO Answer · Texas Borderlands Engineering

El Paso City or El Paso County: Which Plan Review Applies?

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

Inside city limits, the City of El Paso reviews building permits, site plans, and inspections; in unincorporated areas, El Paso County handles development, subdivision, and floodplain review. The parcel's legal location decides the AHJ, so the design team confirms jurisdiction against parcel maps before scoping the submittal.

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.

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City Review: Building Permits and Site Development

A project inside the city limits enters the city's development process, and the building permit is the gateway. The city reviews the architectural, structural, mechanical, electrical, and plumbing plans against the codes it has adopted, reviews the site plan for access, parking, landscaping, and drainage, and schedules building inspections through construction to final occupancy. Commercial projects typically carry additional layers: fire department review of fire protection and life safety, health review where food or care facilities are involved, and utility coordination for water and sewer service through the city's utility providers. The plan set is assembled to the city's published submittal standards, and corrections come back through the city's portal with the reviewer comments the resubmittal must answer. Timing on the city path is driven by workload and by completeness. A complete, coordinated plan set, structural, civil, and MEP drawings that agree with each other, clears review faster than a fragmented submittal that generates cross-discipline corrections. The engineer can accelerate the schedule by pre-checking the parcel's zoning, setbacks, parking ratios, and drainage requirements before the first submittal, because zoning-level issues discovered at plan check force redesign, not just re-drawing. Fees, valuation schedules, and inspection sequencing are published by the city, and the project budget should carry them from the start.

County Review: Development, Subdivisions, and Floodplains

Unincorporated El Paso County is a different regulatory world. There is no city building permit for a county parcel; instead, the county's development services review development permits, and subdivision of land runs through the county's platting process, which governs lot layout, right-of-way dedication, and infrastructure improvements. Floodplain permits are a major county function, since much of the county's growth pressure sits near the Rio Grande floodplain and in arroyo corridors, and the county's floodplain administrator enforces the county's floodplain ordinance on those parcels. Right-of-way permits for work in county roads, driveway connections to county roadways, and drainage review of site grading round out the typical county path. The county review also reaches into infrastructure that the city handles internally. Water and sewer service in unincorporated areas may come from a utility district, a water supply corporation, or on-site systems rather than a municipal utility, so the civil design must confirm the serving utility, its capacity letters, and its connection standards early. Septic systems where allowed follow state on-site sewage rules implemented through the county's local process. Because county parcels often sit farther from established infrastructure, the civil engineer plans extensions, lift stations, and roadway improvements that a city project would never need, and each of those improvements carries its own review and inspection.

What else do project teams ask?

How do I tell whether my parcel is in the city or the county?
Check the parcel against the city's official zoning or annexation map and the county's appraisal district parcel data, not the mailing address, which can read El Paso for unincorporated areas. The legal description and tax records show the taxing jurisdiction. When in doubt, call the city's development office and the county's development services with the parcel number; the engineer does this jurisdiction check before scoping any design work.
Does the City of El Paso review projects outside its city limits?
Generally no for building permits, but the city's planning reach can extend into its extraterritorial jurisdiction for subdivision platting, and state rules let cities exercise limited subdivision authority there. A project in the extraterritorial zone may face both county development review and city platting review. The design team maps every applicable authority for the parcel rather than assuming one office covers everything.
Which AHJ handles floodplain permits near the Rio Grande?
The floodplain administrator of the jurisdiction where the parcel sits. Inside city limits, that is the city's floodplain office enforcing the city's floodplain ordinance; in unincorporated areas, it is the county's floodplain administrator enforcing the county's ordinance. Each reviews elevation certificates, no-rise analyses, and floodproofing under its own rules, and the two offices do not accept each other's floodplain permits.
Can review timelines be predicted?
Only by asking the AHJ. Both the city and the county publish target review times, but actual processing varies with staffing, application volume, and project complexity, and the AHJ alone decides what is approved. The design team should confirm current timelines and plan for at least one round of plan-check corrections when building the construction schedule.

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