Make one master comparison sheet
Create rows for excavation, foundations, concrete, reinforcement, masonry, plaster, MEP work, finishes, labour, transport, overheads, and taxes. Put each bidder's quantity, rate, and total in separate columns. Do not compare only a per-square-foot headline; it often hides missing work.
Mark exclusions before comparing totals
Circle every phrase such as “as required,” “client supplied,” “extra,” or “subject to site conditions.” Then list it separately with an allowance. Common misses include soil removal, temporary electricity, curing water, scaffolding, shuttering, testing, waterproofing, utility connections, and debris disposal.
Normalise material quality
Confirm that each quote names the same concrete grade, steel grade, brick type, pipe class, tile range, paint system, and fitting allowance. A contractor may quote a lower rate because the specification is lower, not because the work is more efficient.
Check payment and variation rules
Use milestones tied to measurable completed work—not vague calendar dates. A sensible quote identifies how quantities will be measured, who signs off on variations, what evidence supports a rate change, and what happens if a supplied item is delayed.