MEP Tender Review Checklist: 40 Items Every Procurement Lead Should Verify

Why tender review matters more for MEP than any other trade

MEP work is a bundle of specialised sub-scopes: chilled water, air distribution, LV distribution, ELV, fire protection, plumbing and drainage, controls, and often gas and medical services. Each has its own scope of drawings, its own material lead times, its own testing regime, and its own commissioning requirements. A civil trade tender can be evaluated by comparing three cost lines; an MEP tender needs the reviewer to sample at least twenty.

The consequence of missing something during review is that scope reappears as a variation after award, when the contractor has the leverage. On projects over $10M in MEP value, the recovery from a good tender review typically ranges from 4% to 8% of contract value in avoided variations. That number is why serious procurement teams do not skip the exercise.

Scope of works verification

Read the scope of works line by line and compare against the drawing set and BOQ. Look for four failure modes: works implied by drawings but not priced in the BOQ, works priced in the BOQ but not shown on drawings, works described in the specification but omitted from both drawings and BOQ, and works described in mechanical and electrical specifications inconsistently (a common problem at the interface between the two disciplines).

Every MEP tender should include: preliminary works, protection of finished works, coordination with other trades, testing and commissioning, spare parts, operation and maintenance manuals, as-built drawings, training, warranty period definition, and defects liability period. Missing any of these on a lump-sum tender means the contractor will bill them separately.

The scope also has to make clear what is not included. Free-issue equipment from the client, works by nominated subcontractors, temporary services during construction, dewatering, external utility connections, statutory approvals, and civil defence permits are common exclusions that must be stated explicitly rather than assumed.

Drawing set completeness

A tender-issue drawing set for MEP typically runs to 300 to 600 drawings depending on project size. The review is not about reading every drawing; it is about verifying that every discipline has: an equipment schedule, a system diagram, a floor plan for each level, sections through the plant rooms, elevations of service risers, and detailed installation details.

Cross-check the drawing schedule against the tabulated BOQ items. If the BOQ lists 40 fan coil units and the mechanical drawings show a schedule of 45, one of the two is wrong. Ask the design consultant to reconcile before award; do not let the contractor take responsibility for the reconciliation after mobilisation.

Verify that the drawings carry the current revision and date. Superseded drawings often survive in the tender pack by mistake, and contractors who spot the discrepancy will price to the cheaper option and claim the difference later.

BOQ and rates analysis

The BOQ is where the tender becomes commercially real. Compare each bidder's rates against the market benchmark and against each other. Highly variant rates are either aggressive (loss-leaders that recover on variations) or optimistic (bidder does not understand the scope). Both are red flags.

For unit rates, verify that installation is included, not just material supply. For provisional sums, confirm the on-cost percentages (typically 10 to 15%) that the contractor will add for management and profit. For provisional items, confirm the measurement method: net or gross, before or after cutouts and voids.

Rate reasonableness is best judged discipline-by-discipline. Chiller supply and installation rate should sit within 15% of the benchmark. Piping installation rate should track with pipe material and route complexity. Cable installation rate depends heavily on containment and route length. LED luminaire rates depend on lumen output more than nominal wattage.

Technical schedules verification

Every MEP tender includes technical schedules for major equipment. For each schedule, verify: model number is compliant with the specification, capacity meets the design intent, efficiency ratings meet the sustainability target, the manufacturer is on the approved list, and the country of origin does not violate the project's procurement rules.

The most common gap is between the schedule and the specification. A chiller schedule may list an air-cooled unit while the specification requires water-cooled with a cooling tower. A fire alarm panel schedule may propose a Chinese OEM while the specification requires UL-listed and approved by the local civil defence. These conflicts must be resolved before award, not during commissioning.

Verify that spare capacity is included. Panels should have 25 to 30% spare ways, transformers should have 20% spare, chillers should have N+1 or N+2 redundancy per the design intent. Contractors sometimes strip spare capacity to save cost; the reviewer has to catch it.

Commercial terms review

The commercial part of the tender covers price, programme, payment terms, retention, bonds, insurance, and liquidated damages. Each element has an MEP-specific dimension.

Programme: verify the contractor has allowed realistic lead times for major equipment. Chillers 16 to 20 weeks. Transformers 20 to 24 weeks. Fire pumps 12 to 14 weeks. VRF systems 8 to 12 weeks. UPS systems 10 to 14 weeks. A contractor who claims 6-week lead time on a 1600 kVA transformer either has stock available (verify) or is planning to source non-compliant equipment.

Payment terms should follow milestone completion, not straight-line time. Typical MEP milestones are: 10% mobilisation, 30% completion of first-fix, 20% completion of second-fix, 20% testing and commissioning, 10% handover, 10% final defects clearance. Retention should be 5% during construction, dropping to 2.5% at practical completion.

Bonds and insurance: verify performance bond, advance payment bond, and defects liability bond are all called for and the values are set correctly. Confirm the contractor's all-risks insurance includes MEP works during storage before installation and during commissioning.

Interface and coordination items

MEP work does not exist in isolation. The tender must clarify interfaces with structural (embedded conduits and sleeves), architectural (ceiling grid coordination, finish penetrations), civil (utility connections, soakaways, external drainage), and specialist trades (medical gas, kitchen equipment, ATM/lift installations).

Look for BIM coordination requirements. Modern MEP tenders often require LOD 350 or 400 models delivered to the main contractor for clash detection. Confirm the contractor has priced the BIM management cost, not just the drafting.

Confirm builder's work responsibility. Holes through structure, plinths for equipment, kerbs around plant rooms, and fire-stopping through fire-rated walls are all potential grey areas. State clearly whether MEP contractor or main contractor is responsible, and price it once.

Checklist

1. Scope of works cross-checked against drawings and BOQ
2. All disciplines have complete drawing sets with current revisions
3. Equipment schedules reconcile with BOQ quantities
4. Rates compared to market benchmark and between bidders
5. Technical schedules verified against specification
6. Spare capacity included in panels, transformers, chillers
7. Country of origin and approved-manufacturer list confirmed
8. Lead times realistic for long-lead equipment
9. Payment milestones defined against MEP-specific stages
10. Bonds, insurance, and LD provisions in place
11. Interface with structural, architectural, civil, and specialists clarified
12. BIM coordination scope and LOD stated
13. Builder's work responsibility assigned
14. Testing and commissioning scope defined per system
15. Spare parts list included with pricing
16. O&M manuals and training explicitly required
17. As-built drawings scope and format defined
18. Warranty period start-point defined
19. Defects liability period and hold-back terms clear
20. Provisional sums and dayworks rates included and reasonable

Common mistakes

• Accepting the lowest bid without comparing rate distributions
• Assuming exclusions are the same across all bidders
• Missing lead-time verification on major equipment
• Not requiring BOQ resolution before award
• Signing without a clear variation approval process

Frequently asked questions

How long should tender review take on a $20M MEP package?

Two to three weeks with a lead reviewer and one support engineer per discipline. Compressed timelines below one week almost always miss something material.

What is a typical variation percentage on well-reviewed vs poorly-reviewed MEP tenders?

Well-reviewed tenders average 4 to 6% variation on final account. Poorly-reviewed tenders average 12 to 20%, mostly from scope-gap claims that could have been caught pre-award.

Should the design consultant lead the tender review?

The design consultant should be part of the review team but not the sole reviewer, because they have a natural interest in defending their design against ambiguity claims. An independent procurement lead should chair.

Related calculators on this site

• MEP Capex Quick Check
• MEP Budget Band Estimator
• MEP Due Diligence Checklist

About this reference

Umar Dar is an MEP engineer with more than 15 years of experience in mechanical, electrical, and plumbing design and procurement across the Middle East and South Asia. He founded I Love MEP as a free resource for engineers, estimators, and procurement professionals.