MEP Subcontract Package Scope on a Saudi Project

An MEP subcontract package is the mechanical, electrical and plumbing scope a main contractor sublets as one or more priced packages. A clear one lists the systems included, the quantities, the standards (SBC 401, 501, 701 and 801), what others provide, the tests at handover and the documents that close it out.

Split by system, not by trade name

"MEP" is a label, not a scope. Break the work into systems and write each one down. Mechanical usually means HVAC (split, VRF or packaged units, chilled water, ductwork, ventilation) and the testing and balancing at the end. Plumbing means water supply, sanitary drainage, fixtures, tanks and booster sets, and roof drainage. Fire protection means sprinklers, hydrants and the fire pump set. Electrical means LV distribution, lighting and emergency lighting. Low-current means fire alarm, structured cabling, CCTV and access control, and building controls.

You can sublet these as one package or several. A common split pairs HVAC with its controls, or the sprinkler system with the fire alarm. What matters is that each system lands in exactly one package, so no one prices it twice and no one leaves it out.

Supply and install, or install only

State which items the contractor buys and which the client free-issues. NLS Contractors takes works packages: supply and install, or installation of client-supplied equipment. Where equipment comes from outside the package, say who delivers it, where, and who unloads and stores it. Electrical, HVAC and fire equipment can also be sourced through NLS Power if that suits your procurement.

Interfaces are where claims start

Most disputes on MEP packages come from the edges between them. Write down who provides:

• power to each piece of equipment, up to which terminal
• sleeves, openings, plinths and cores (builder's work in connection)
• firestopping of penetrations
• supports and hangers, and the crane or hoist for plant lifts
• temporary power, water and storage during the works
• painting and making good after the installation

If the drawings are silent, the RFQ should not be. A line like "builder's work by main contractor, sleeves by MEP" costs nothing and avoids an argument later.

Standards and the consultant's specification

The Saudi Building Code parts that usually apply are SBC 401 for electrical, SBC 501 for mechanical, SBC 701 for sanitary and plumbing, and SBC 801 for fire protection, with SBC 601 on energy conservation. NFPA standards (13, 14 and 20 for sprinklers, standpipes and fire pumps, 72 for fire alarm) and SMACNA for duct construction come in through the specification. The consultant's specification governs where it is stricter. Quote the clause numbers in the RFQ so bidders price the same standard.

Tests that close the package

An MEP package is not finished when the last pipe is hung. It finishes when the tests pass and the records are signed:

• electrical: insulation resistance, continuity and earth loop impedance to IEC 60364-6
• plumbing: hydrostatic pressure tests, flushing and disinfection before use
• fire protection: hydrostatic acceptance and pump performance tests, with Civil Defense witnessing
• HVAC: pressure tests, flushing, duct leakage tests, then testing, adjusting and balancing

Say in the RFQ who witnesses which test, because the date of a witnessed test can decide the handover date.

How the package is priced

Say whether the offer is lump sum on the BOQ, measured against the BOQ rates, or a mix. Where design is not final, a provisional sum with a stated basis is better than a silent allowance. The offer should list its exclusions in plain words, and it should state the validity period. Lead time and price depend on the scope, the equipment source and the programme, and the offer is where they get stated.

Documents and phasing

List the documents: coordinated shop drawings, material submittals, test records, as-builts, O&M manuals and operator training. If the project has several buildings or floors, say whether handover is phased. Phased handover changes the sequence of testing, and it should be in the programme from the start.

Where to go next

For the main systems, read the scope pages for chilled water piping and plant rooms, sprinkler, hydrant and fire pump installation and LV power distribution installation. The sector view is on the MEP packages page.

FAQ

What is the difference between an MEP package and a general contract?

A general contract covers the whole building including civil and architectural work. An MEP package covers only the mechanical, electrical and plumbing systems, and is usually let by the main contractor after the main contract is awarded.

Should HVAC controls sit in the HVAC package or the BMS package?

Either works, but pick one and write it down. If the controls are separate, the RFQ must say who supplies the control valves, dampers and actuators, and who wires them.

Who does the builder's work in connection?

The RFQ must say. The usual arrangement is that the main contractor forms openings and plinths while the MEP package supplies sleeves and the setting-out information.

What should an MEP subcontract RFQ include?

The scope by system, BOQ, drawings with revision numbers, specification clauses, the interface table, the tests, the document list, the programme and the commercial terms.