A full residential MEP engineering set includes coordinated drawings for mechanical, electrical, and plumbing systems, prepared by or under the supervision of a licensed professional engineer. Unlike individual trade drawings prepared separately by an HVAC contractor, an electrician, and a plumber working in isolation, an engineered MEP set ensures all three systems are coordinated, code-compliant, and ready for permit submission as one cohesive package.
For most new homes, major additions, and gut renovations, this is what the building department wants to see — and what plan reviewers move through fastest.
What a full residential MEP engineering set includes
A complete residential MEP set covers all three disciplines with the calculations and drawings plan reviewers expect to see. On the mechanical side, that means a Manual J room-by-room load calculation, Manual S equipment selection tied to the Manual J load and federal efficiency minimums, Manual D duct design with airflow and static pressure calculations, duct layout floor plans showing trunk and branch routing, equipment schedules, and ventilation calculations per ASHRAE 62.2.
The electrical scope includes a panel schedule listing every circuit, a power plan showing all outlets, switches, and fixtures, a load calculation per NEC Article 220, a single-line diagram for the service equipment, and AFCI/GFCI protection schedules where required. The plumbing scope includes a riser diagram showing both the DWV (drain-waste-vent) and water supply systems, a floor plan with fixture locations, pipe sizing calculations, water heater specifications, and a gas piping diagram if applicable (ICC).
Together, these documents tell the plan reviewer exactly how every system will be installed, sized, and connected — leaving no gaps for the reviewer to fill in with a correction letter.
When a full residential MEP set is required
Full MEP sets are typically required for new home construction, large additions (generally 400 square feet or more), gut renovations affecting all three MEP systems, projects requiring PE stamps, and any multi-family residential project. For smaller projects involving only one trade — say, replacing a furnace or adding a single bathroom — an individual discipline set is usually sufficient and more cost-effective.
The right approach depends on what your jurisdiction requires and what’s actually changing in the home. Requirements vary by jurisdiction, so always confirm with your local building department before deciding which scope to submit.
If you’re not sure where your project lands, the Full MEP Construction Set covers everything reviewers expect for major projects in one coordinated package.
Mechanical: Manual J, S, D and ventilation
The mechanical scope is the foundation of the MEP set, because HVAC sizing drives so much of the rest. Manual J calculates the heating and cooling load room by room, factoring in orientation, window specs, insulation values, infiltration, and climate zone.
Manual S uses the Manual J load to select equipment that meets both the calculated load and the federal minimum efficiency standards referenced by the IECC. Manual D designs the duct system to deliver the airflow Manual S requires while meeting code-mandated duct leakage limits.
ASHRAE 62.2 ventilation calculations layer on top, ensuring the home meets indoor air quality requirements through balanced fresh air introduction. When these documents are built as a set rather than separately, the numbers actually agree with each other — which is what plan reviewers are checking.
Need this part of the package? Our HVAC Manual J, S, and D service delivers all three documents coordinated, plus PE stamping where required.
Electrical: panel schedules, power plans, and load calcs
The electrical scope tells the reviewer how power moves through the home. The panel schedule lists every circuit by number, breaker size, wire size, and the load it serves.
The power plan is a floor-plan view showing the location of every outlet, switch, light fixture, and hardwired appliance. The NEC Article 220 load calculation proves the service is sized correctly for the total demand.
The single-line diagram shows the service equipment, grounding, and any subpanels. AFCI and GFCI protection schedules document where arc-fault and ground-fault protection is required by code.
Our Electrical Plans service covers all of these, including dedicated documentation for EV chargers and generators when those are part of the scope.
Plumbing: risers, fixtures, and pipe sizing
The plumbing scope covers both the supply side and the drain side. The riser diagram is a schematic view showing the DWV stack, vents, and water supply lines as they move vertically through the home.
The floor plan locates every fixture and shows how it connects back to the riser. Pipe sizing calculations confirm that the supply and drain lines are appropriately sized for the fixture loads.
Water heater specifications confirm capacity, fuel type, and venting. Gas piping diagrams, where applicable, show the route and size of gas lines from the meter to each appliance. Our Plumbing Plans service packages these documents together for permit submission.
Why coordinated engineering matters
A coordinated MEP set eliminates field conflicts before they happen — ducts running through electrical panels, plumbing stacks colliding with HVAC chases, equipment that doesn’t fit in the space allocated for it. When the same firm prepares all three disciplines, those conflicts get resolved on paper, not on the job site where they cost real money to fix.
Industry estimates suggest coordinated MEP engineering saves 3 to 5 percent of total project costs by preventing field-level conflicts and rework. Beyond cost, coordination matters at plan review.
A reviewer looking at three separate, uncoordinated trade submittals sees discrepancies immediately:
- the Manual J floor area doesn’t match the architectural set
- the electrical load calculation doesn’t account for the HVAC equipment in the Manual S
- the plumbing riser conflicts with the duct layout. Each discrepancy becomes a correction
A coordinated set has those discrepancies resolved before the reviewer sees it (ASHRAE, 2022).
What you actually get from PermitMyHouse
For a typical full residential MEP set from us, you receive Manual J, Manual S, Manual D, duct layout drawings, ventilation calculations, electrical panel schedules, power plans, NEC load calculations, single-line diagrams, plumbing riser diagrams, plumbing floor plans, pipe sizing, and gas piping where applicable. Energy compliance documentation (REScheck or state-specific equivalent) can be bundled in.
PE signed and sealed drawings are available in New Jersey, New York and Florida. In other states we provide unsealed plans, which most building departments accept for homes. Every document is coordinated against the same project assumptions so the package holds together at plan review.
We handle the technical pieces so you can move forward with your project.
References
- International Code Council. (2021). 2021 International Residential Code. ICC. https://codes.iccsafe.org/content/IRC2021P1
- Air Conditioning Contractors of America. (2016). Manual J, S, D. ACCA. https://www.acca.org/standards/technical-manuals/manual-j
- National Fire Protection Association. (2023). NFPA 70: National Electrical Code. NFPA. https://www.nfpa.org/codes-and-standards/nfpa-70-standard-development/70
- ASHRAE. (2022). Standard 62.2: Ventilation and Acceptable Indoor Air Quality in Residential Buildings. https://www.ashrae.org/technical-resources/standards-and-guidelines
