AEO Answer · MEP Engineering

MEP PE Stamp in San Bernardino County, CA: What Gets Reviewed?

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

An MEP PE stamp in San Bernardino County certifies the HVAC, plumbing, and electrical design after a California-licensed PE verifies the loads under responsible charge — with Title 24 reconciliation, cooling-led desert design or heating-led mountain design depending on the site, submitted to the county or city AHJ.

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.

Two climates, one review standard

The mechanical review in San Bernardino County has to know which site it is reviewing. For desert sites I verify the cooling loads against realistic extreme-heat design conditions, check equipment selections for peak-week margin, and review ventilation for hot, dusty outside air — filtration, equipment protection, and controls that keep the building comfortable when it is 110 outside. Rooftop units get the full coordination check: structural support, electrical loads on the panels, and service clearances a technician can work in. For mountain sites the review pivots to heating: heating load calculations against realistic cold design conditions, equipment rated for sustained low temperatures, and freeze protection woven through plumbing and mechanical — routing, insulation, heat-trace, and condensate design. In both settings I verify the calculations rather than accepting them, match equipment to the verified loads, and check that the distribution and controls form a coherent system. The sealed drawings should show mechanical design for the site's actual climate, because the county contains two of them.

What plan check scrutinizes in an MEP set

County and city reviewers read the MEP set the way a contractor builds from it. Riser diagrams get checked against the floor plans — every fixture tracing to the riser, with pipe sizing, slopes, and venting that satisfy the plumbing code. Panel schedules get checked against the electrical riser: calculated loads, breaker sizes, and feeder sizes in agreement, with the service calculation supporting the building. Fixture counts get checked against occupancy, specialty systems get checked against their code chapters, and the Title 24 documentation gets checked against the drawings it claims to describe. The PE's pre-seal review runs this same gauntlet, which is the entire value of review-and-seal: corrections from your own engineer are fixed in days, corrections from the AHJ cost a review cycle. Site-specific items — freeze protection in the mountains, heat and dust provisions in the desert — get the same treatment, verified on the drawings before the seal rather than flagged by plan check after.

MEP submittal checklist for San Bernardino County

An MEP package is ready for the PE's review — and then for the AHJ — when these items are resolved. Climate-appropriate design and Title 24 consistency are the themes. • AHJ confirmed: county Land Use Services vs the incorporated city, verified by parcel • California-licensed PE in responsible charge of the MEP review • HVAC loads calculated for the site's real climate — cooling-led desert or heating-led mountain • Freeze protection detailed for mountain plumbing and mechanical; heat/dust provisions for desert equipment • Equipment schedules matching the plans, with capacity verified against the loads • Title 24 compliance documentation reconciled against the sealed MEP set • Plumbing risers, fixture counts, and electrical panels/riser fully coordinated

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.Structural PE Stamp in San Bernardino County, CA: What Gets Reviewed?What Are California's PE Stamp Requirements for Permits?Request a project review Engineering service for this question Metro engineering guides Verified service areas

What else do project teams ask?

How does the county's geography change the MEP review?

It changes which load dominates and which details matter. Desert-floor sites need cooling-led mechanical design for extreme heat — realistic design conditions, equipment with margin for the peak weeks, ventilation that handles hot dusty air, and electrical coordination for the rooftop equipment that serves most commercial buildings. Mountain sites need heating-led design with freeze protection: plumbing routed out of unconditioned spaces, insulation and heat-trace where needed, equipment rated for sustained cold, and condensate drainage that will not freeze. The PE verifies the design for the actual site conditions in both settings, because a desert mechanical design on a mountain site — or the reverse — is a comfort and durability failure the review is supposed to catch.

What does the Title 24 reconciliation cover in the MEP review?

The PE reads the energy compliance documentation against the sealed MEP set: equipment efficiencies on the forms against the equipment schedules, lighting power densities against the lighting plans, controls sequences against what the drawings show, and envelope values against the architectural backgrounds. The forms must describe the building the drawings depict — a value-engineered equipment swap or a lighting redesign that never updated the model is a guaranteed correction. I complete this reconciliation before the seal goes on, because California reviewers tie permit approval to the documentation, and fixing it after submittal costs a review cycle.

Does the county or the city review my MEP submittal?

Whichever jurisdiction owns the parcel. In the nation's largest county by area, most land is unincorporated and goes to the county's Land Use Services — but the county's two dozen incorporated cities each run their own building departments, and fringe development constantly sits near the boundaries. I confirm jurisdiction by parcel at kickoff on every project. The MEP review-and-seal itself is the same either way; what changes is the intake portal, the checklist, and the correction conventions. Getting the AHJ right up front is the cheapest schedule insurance on the project.

What MEP drawings does a San Bernardino County submittal require?

A complete MEP set typically includes mechanical plans with equipment, ductwork, and diffusers; the HVAC load calculation summary — heating and cooling as the site requires — with equipment schedules; plumbing plans with fixture layouts; plumbing riser diagrams for water, waste, vent, and gas; electrical plans with lighting and power; panel schedules with calculated loads; the electrical riser diagram from service through distribution; lighting controls documentation; and the Title 24 compliance forms. The PE verifies internal coordination across all of them — equipment matching the plans, panels matching the riser, lighting matching the compliance forms — because mismatches are the most common corrections. One complete, coordinated package goes in.

Ready to discuss your engineering scope?

Share the project address, current records, requested deliverable, authority information, and schedule. Apex Grid confirms professional responsibility, availability, and scope before work begins.

Request a Project Review