What is included in MEP Plans?

A complete set of ADU MEP plans includes detailed, permit-ready engineering for all three disciplines — Mechanical, Electrical, and Plumbing — plus a cover sheet, code references, formal calculations, and equipment schedules. Below is what each part of the set contains.

Mechanical sheets (M-1, M-2)

• HVAC system type and layout, with indoor and outdoor unit locations
• Heat load calculations (Manual J) sizing the equipment to the ADU
• An equipment schedule listing make, model, capacity (BTU/hr), and efficiency ratings
• Ductwork routing and sizing for ducted systems
• Whole-building ventilation per ASHRAE 62.2 and Title 24
• Kitchen range hood ducted to exterior, bathroom exhaust fans, and condensate drainage

Electrical sheets (E-1, E-2)

• An electrical floor plan showing every outlet, switch, light, and fixture
• A panel schedule listing each circuit with description, amperage, and voltage
• A formal load calculation per NEC/CEC Article 220
• Dedicated circuits for HVAC, range, dishwasher, washer/dryer, and EV charger
• GFCI notation (kitchens, baths, garages, outdoors) and AFCI notation (bedrooms, living areas)
• Smoke and CO detector locations, plus EV-ready conduit and any solar/ESS provisions

Plumbing sheets (P-1, P-2)

• A plumbing floor plan with all fixture locations
• A fixture schedule confirming CALGreen low-flow compliance
• Water supply design with pipe routing and sizing
• A drain-waste-vent (DWV) system with correct slope, vent stacks, and cleanouts
• Sewer connection details and water heater specifications (type, efficiency, venting, seismic strapping, T&P relief valve)
• Backflow prevention and gas piping where gas appliances are allowed

The supporting documents that tie it together

Beyond the discipline sheets, a permit-ready set includes a cover sheet with the project address, applicable codes (CBC, CEC, CPC, CMC, Title 24), and general notes. The formal calculations — Manual J for mechanical and NEC Article 220 for electrical — are what plan checkers most often look for, and their absence is a leading cause of corrections. The exact contents vary by project type and local requirements, so confirm specifics with your building department.

Permit-ready vs. design drawings

It's worth understanding what "included" really means. Design drawings show general intent and are useful for planning and estimating, but they are not what a building department accepts. A permit-ready set is a fully completed construction document that meets the city's specific format and content requirements: a complete cover sheet with code references, full equipment schedules with manufacturer specifications, formal calculations, all required notes and callouts, GFCI/AFCI notation, and proper sheet labeling. What we deliver is permit-ready — not a preliminary sketch.

How delivery and format work

The finished plans are delivered as PDFs formatted for 24" x 36" printing, the standard sheet size California building departments require for permit submittal. These files are compatible with electronic plan review portals such as ePlanLA and eTRACKiT and can be printed at any large-format print shop for physical submittal. Every order also includes two revisions and city corrections at no extra charge, so the set you receive can be adjusted as your project — or the plan checker — requires.

Want all three disciplines coordinated as one set? That is exactly what the Full MEP Package delivers. You can also order a single discipline — mechanical, electrical, or plumbing — if your project only needs one.