Responsibility Matrix for MEP
How to read and use the matrix to prevent scope gaps for Mechanical, Electrical, and Plumbing.
Open ConstructIQLearning Goals (30 min)
- Locate the Responsibility Matrix in a plan set.
- Interpret how duties split across M, E, and P.
- Cross-check the matrix against drawings & specs to catch conflicts early.
Where to Find the Matrix
Typically on the Architectural (A) cover or general notes pages. Some projects also include it in Division 01 and the discipline specs (Div 22, 23, 26).
How to Read It – MEP Essentials
The matrix maps system/components to the party responsible for design/coordination, installation, power/controls, and testing/commissioning.
- Rooftop Unit (RTU): M installs & sets; E provides feeder/disconnect; controls by E or ATC vendor per spec.
- Boiler / Water Heater: P provides gas/water; M installs hydronic components; E powers pumps and controls.
- Lighting & Controls: E installs; coordinate with GC for ceilings and ATC for sequences.
- Domestic Water: P installs and tests; E powers heat trace where specified.
Sample Responsibility Matrix (Excerpt)
| System / Component | Mechanical | Electrical | Plumbing | Notes |
|---|---|---|---|---|
| Rooftop Unit (RTU) | Install / set | Power + controls | — | Verify disconnect & curb by trade |
| Boiler / WH | Hydronic equip. | Power + controls | Gas + water | Combustion air by M |
| Lighting & Controls | — | Install | — | Coord. with ceiling trades |
Coordination Tips
- Cross-check the matrix with MEP detail sheets and equipment schedules.
- Clarify splits (power vs. install) with an RFI before buyout.
- Capture matrix notes in your estimate scope list to avoid gaps.