Subcontractor Quotation Reviews: Why the Cheapest Quote Is Not Always the Best Quote
The lowest number on the comparison sheet often carries the biggest gaps. How scope, exclusions, qualifications and programme risk decide the true cost of a subcontract quote.
Every estimator has seen it: three quotes for a package, one 15% below the others, and the tender deadline is tomorrow. The temptation is to take the number and run. Six months later that "saving" has been consumed by gaps, extras and a strained relationship — with plenty left over.
Scope gaps
The first question is never "what is the price?" but "what is priced?" A cheap quote is often cheap because it covers less: fewer visits, no attendance on others, key interfaces excluded, or whole drawings not allowed for. Mapping each quote against the enquiry scope line by line shows what is actually covered — and what will come back as an extra.
Exclusions and qualifications
The exclusions list is where the real price hides. Common examples that quietly transfer cost back to you:
- Out-of-hours or phased working excluded
- Access equipment, scaffolding or task lighting by others
- Waste removal and skips by others
- Making good, protection and builder's work excluded
- Rates "subject to remeasure" or "subject to site survey"
- Quotes valid for 30 days on a job starting in six months
Each exclusion has a cost. Adjudication means pricing those gaps and adding them to the comparison — the moment you do, the ranking usually changes.
Programme risk
A subcontractor who cannot resource your programme is expensive at any price. Delayed predecessors, missed windows and standing time ripple across every following trade. Quote reviews should weigh stated lead times, resource levels and any programme qualifications, not just the bottom line.
Design responsibility and material assumptions
Does the quote include design where the package needs it — and is that backed by PI insurance? Are specified materials priced, or "equal and approved" alternatives assumed? A quote based on a cheaper alternative product may not survive the specification, and the uplift lands after the subcontract is let.
Temporary works and access requirements
Attendances are a classic gap: who provides the crane time, the hardstandings, the edge protection, the power and water? If the quote assumes attendances you have not priced, the tender is under-covered from two directions at once.
Commercial comparison and tender adjudication
A proper adjudication sheet levels every quote to a common scope: base price, plus priced gaps, plus risk adjustments, with exclusions and qualifications visible. It records why a subcontractor was selected — useful when the client asks, and essential when things go wrong. The output is a defensible recommendation, not just a lowest number.
EdgelineQS provides subcontractor quotation reviews, comparison and adjudication support for contractors — scope gap analysis, exclusion reviews, rate checking and commercial risk notes — so packages are bought on true cost, not headline price.
Need help with this on a live project?
Submit your project details and upload your drawings, BOQs, schedules or contract documents — EdgelineQS will review the scope and come back with clear next steps.