AI-generated conceptual illustration — not a photograph of a Secured Engineers project or a construction drawing.
MEP stands for mechanical, electrical and plumbing, and many project teams add fire protection to the scope. A BOQ, or bill of quantities, lists the items and quantities contractors price. Most tender disputes over MEP start where these two documents disagree.
What MEP drawings should include
Mechanical: ventilation and air-conditioning layouts, equipment schedules and plant rooms.
Electrical: single-line diagram, load schedule, power and lighting layouts, earthing and panel schedules.
Plumbing: water supply, drainage, tanks, pumps and treatment.
Fire: detection, hydrants, sprinklers where required, and the pump room.
Coordination: sections through congested areas, showing how services fit with the structure.
Five checks before a BOQ goes to tender
Does every item on a schematic have a matching BOQ item?
Does every BOQ item trace back to a drawing or specification?
Are controls, testing and commissioning priced, and by whom?
Is it clear who supplies the plinths, sleeves, builder's work and power connections?
Are provisional sums and assumptions labelled, so bidders price the same scope?
Why this saves money
A gap found before tender is a drawing correction. The same gap found on site can become a variation, a delay or a dispute. A referenced issue list lets your team fix the documents while it still has leverage.
