A complete MEP design package is the coordinated set of calculations, drawings, specifications and schedules that defines a building's mechanical (HVAC), electrical, plumbing and fire-fighting systems. It should be detailed enough to obtain approvals, price accurately through a Bill of Quantities, tender to contractors and install on site without guesswork.
MEP stands for mechanical, electrical and plumbing. In Egypt you will also hear "electromechanical works" for the same scope. The systems often account for a large share of a building's cost and most of its running cost, so the quality of the design package has a direct effect on your budget long after handover.
What does a complete MEP design package contain?
A complete package has five layers. Drawings are only one of them.
- Design basis report. The brief in engineering terms: occupancy, operating hours, design conditions, applicable codes and the client's performance requirements.
- Calculations. The numbers behind every system size, documented so a reviewer can check them.
- Drawings. Schematics, layouts, sections and details for each discipline.
- Specifications. The written standard for materials, equipment, workmanship, testing and commissioning.
- Schedules. Equipment, fixtures, panels and fittings listed with their capacities and locations.
Designs in Egypt are normally prepared to the Egyptian Code (ECP) and relevant international standards. The design basis report should name which ones apply, so everyone works to the same rules.
What is included for each discipline?
The table below shows the typical deliverables per discipline. Exact scope depends on the building type and the authority requirements.
| Discipline | Key calculations | Key drawings and documents |
|---|---|---|
| Mechanical (HVAC) | Cooling and heating loads, airflow, duct and pipe sizing, ventilation rates | HVAC layouts, duct and chilled-water routes, plant room layouts, equipment schedules, control philosophy |
| Electrical power and lighting | Load schedules, maximum demand, cable sizing, voltage drop, lighting levels | Single-line diagram, distribution board schedules, power and lighting layouts, earthing and lightning protection |
| Low-current systems | Device coverage and system capacity | Fire alarm, data, CCTV, access control and sound system layouts and riser diagrams |
| Plumbing and drainage | Water demand, pipe sizing, tank and pump sizing, drainage flows | Water supply and drainage layouts, riser diagrams, sanitary fixture schedules, pump and tank details |
| Fire-fighting | Hydraulic calculations, water storage, pump duty | Sprinkler and hose-reel layouts, fire pump room details, riser diagrams |
Mechanical (HVAC)
Heating, ventilation and air conditioning (HVAC) design starts with a load calculation for every space. That calculation sets the size of the units, the airflow and the duct and pipe sizes. Under-sizing leaves rooms uncomfortable. Over-sizing wastes capital and energy. Good HVAC drawings also show access for maintenance, condensate drainage and where outdoor units or chillers sit.
Electrical
The single-line diagram is the backbone of the electrical design. It shows how power flows from the utility supply or transformer through main and sub-distribution boards to final circuits. It must agree with the load schedules and the cable sizes. Lighting layouts, socket layouts and earthing complete the power design.
Plumbing and fire-fighting
Plumbing design sizes the water supply, storage tanks, booster pumps and drainage so that fixtures get adequate pressure and waste drains without blockage or odour. Fire-fighting design is closely linked, because the two systems often share tanks and pump rooms. Fire systems also need authority approval, so their drawings must follow the required format.
Why does coordination matter as much as the drawings?
Each discipline can be correct on its own and still fail on site. Ducts, cable trays, pipes and sprinkler mains all compete for the same ceiling void, and all of them must pass beams and columns. When nobody checks them together, the clashes are found during installation, when they are most expensive to fix.
A complete package therefore includes coordinated services drawings: combined layouts or a 3D model that show every service in its real position, with clear heights and structural openings agreed with the structural engineer. This is the single most effective step to reduce rework, and it is often the step that is missed.
How detailed should the package be?
Detail grows through the design stages:
- Concept. System selection, plant space and shaft allowances.
- Design development. Calculations, sized layouts and the main equipment.
- Construction documents. Full layouts, details, specifications and schedules, ready for tender and BOQ.
- Shop drawings. Prepared by the installing contractor, showing exact routes and fixings, and checked against the design.
- As-built drawings. The record of what was installed, handed over with operation and maintenance manuals.
If you plan to price or tender the work, you need construction-document level. That is what allows a Bill of Quantities to measure every metre of duct and cable rather than estimate it.
What are the warning signs of an incomplete package?
- Drawings with no calculations behind them.
- Schematics only, with no sized layouts.
- No specification, or a generic one copied from another project.
- No equipment schedules, so capacities are undefined.
- No coordination drawings between services and structure.
- Fire-fighting left "by the specialist contractor" with no design intent.
Each gap becomes a decision that someone makes later, usually on site and usually at extra cost.
How does design connect to installation?
The best test of a design package is whether it can be built as drawn. That is easier when the designers also understand installation and commissioning. On Laurent's commercial MEP project in Cairo, the same team designed and installed the mechanical, electrical and plumbing works, so design questions were resolved by the people who would install the systems.
You can see how Laurent approaches design, installation, testing and commissioning on the MEP contracting page.
Start with a complete package
Whether you have architectural drawings ready or only a brief, a complete MEP design package is the foundation for accurate pricing and a smooth installation. Laurent is Alexandria-based and delivers MEP design and contracting across Egypt. Start your project and tell us what you are building.
