On small projects a contractor is chosen on recommendation. On large ones, recommendation alone is expensive. Prequalification is the procedure that separates a contractor who can build from one who can only bid low — and any client can apply it, needing little more than an organised checklist.
First: legal and financial standing
Begin with documents: a valid company registration, legal identity, tax position and insurances. A party that cannot produce these within days is not ready for a large project to begin with.
Then financial capacity: can the company fund a full work cycle between one payment certificate and the next? A contractor whose site stops whenever a payment is late converts their cash problem into a delay on your programme.
Second: relevant experience, not experience in general
Twenty residential projects do not automatically qualify a firm for a plant or an institutional building. Ask for a record of projects resembling yours in type, size and technical complexity — not a record of everything ever built.
For each project listed, ask three questions: what exactly was the company’s role, main contractor or subcontractor? What was the planned duration against the actual one? And can the client be spoken to?
Third: the team — on paper and on site
Ask for the organisation chart, the names of those who will work on your project specifically, and their qualifications. There is a large difference between a company that has engineers and one that will hire engineers after award.
Ask specifically: are the engineering disciplines in house or subcontracted? The difference surfaces at the first clash between a mechanical drawing and a structural one — resolved in a meeting, or resolved through correspondence that takes weeks.
Fourth: how the site is actually run
Ask for the quality plan and the safety plan as written documents. Ask about inspection and hold points, how variation orders are documented, and what the periodic report you will receive looks like.
Better than all of it: ask to visit a site the company is running now. A site says things about a company’s management that no file will — through its order, its material storage, its safety and its cleanliness.
Fifth: the lowest bid is not the criterion
A bid abnormally below the others is a warning, not an opportunity. It usually means a lower specification, omitted items that will return as variations, or mispricing that ends with a contractor stalling mid-project — the worst possible outcome for the client.
The sound criterion is best value: a clear specification, a realistic programme, a proven team, and a price within a sensible range of the rest.
A short checklist before award
Registration, tax position and insurances · a project record comparable in type and size · contactable references · the team structure assigned to the project · quality plan and safety plan · an outline programme with the critical path · the variation-order mechanism · the format of the periodic report · a visit to a live site.
Frequently asked
What is the difference between prequalification and tender?
Prequalification examines a company’s ability to deliver before it is invited to price. The tender compares prices among firms whose eligibility is already established.
Is the lowest bid the right choice?
Not necessarily. An abnormally low bid usually indicates a lower specification or omitted items that will return later as variation orders.
How long should a qualification pack take?
For an organised company, two working days. Longer than that is itself an indicator.
