Common Mistakes in Construction Tender Submissions

Summary: A construction tender submission is more than a price attached to a set of drawings. Small mistakes in tender documents, pricing, eligibility checks or submission procedures can affect whether a bid is considered compliant. This article looks at the most common construction tender mistakes, with examples relevant to Singapore and wider construction markets, and explains how contractors can strengthen their tender submission process.

What Is a Construction Tender Submission?

A construction tender submission is a contractor’s formal response to an invitation to tender, setting out its proposed price, technical approach, qualifications and supporting information. – BCA

In Singapore, GeBIZ defines a tender as “a method that is adopted to invite interested suppliers to submit bids and proposals” for procurement above the applicable threshold. Internationally, ISO 10845-4:2021 similarly focuses on what is required for a compliant submission and how evaluation criteria are communicated.

The principle is straightforward: read the requirements, price the work accurately and submit exactly what is requested. Yet, several avoidable mistakes continue to appear during the tender process.

Not Reading the Tender Documents Carefully

One of the most common tender submission mistakes is treating the invitation, specifications and conditions of tender as background information rather than instructions.

A contractor may focus heavily on the drawings and bill of quantities while overlooking:

Mandatory forms and declarations
Submission deadlines
Required supporting documents
Tender validity periods
Evaluation criteria
Registration or licensing requirements
Site briefing or tender briefing requirements
Specific formatting or electronic submission instructions

This can create problems even when the tender pricing itself is accurate. GeBIZ advises suppliers to understand the critical evaluation criteria and follow the instructions contained in the tender documentation.

Getting the Tender Price Wrong

Pricing errors can be surprisingly simple: a duplicated item, omitted allowance, incorrect quantity, misplaced decimal point or mismatch between the pricing schedule and the electronic submission.

The GeBIZ bid checklist specifically warns suppliers to double-check figures because an incorrect comma or additional zero can jeopardise a bid.

Before submitting, contractors should carry out at least three checks:

Quantity check: Are the quantities consistent with the tender documents?
Rate check: Are labour, materials, plant, subcontractor and overhead rates realistic?
Total check: Does the final tender sum reconcile across every submitted document?

A second-person review by someone who did not prepare the original estimate can also help identify overlooked errors.

Focusing Only on the Lowest Price

A low price does not automatically make a construction tender competitive.

Different procurement systems assess different combinations of price, quality, technical capability and other criteria. For example, Singapore’s BCA Price Quality Method (PQM) evaluates public sector construction tenders using both price and quality. For applicable CW01 and CW02 tenders of S$3 million and above, price and quality carry specified weightings rather than relying solely on the lowest bid.

A strong tender submission should demonstrate how the contractor can deliver the required scope, programme, quality and project outcomes—not simply offer the cheapest number.

Ignoring Eligibility Requirements

Before spending significant time preparing a bid, contractors should confirm that they are actually eligible to tender. In Singapore’s public sector, BCA registration grades and workheads can determine the projects that firms are eligible to bid for.

Firms registered under the Contractors Registration System are eligible to participate in public sector construction tenders within the tendering limits corresponding to their registration grade and workhead. -BCA

The check should therefore happen early:

Check	Why It Matters
Registration grade	Confirms whether the project value is within the firm’s tendering limit
Workhead	Establishes whether the firm’s registered scope matches the tender
Track record	May form part of qualification or evaluation requirements
Financial requirements	May affect eligibility
Mandatory documents	Missing documents can affect compliance

Requirements vary between countries and clients, so contractors working across Southeast Asia or other international markets should always check the specific procurement rules for each tender.

Leaving Clarifications Until Too Late

Tender documents are not always perfectly straightforward. Drawings, specifications and contractual requirements can contain areas that need clarification. Waiting until the final hours to raise questions can leave little time to adjust the estimate or methodology.

GeBIZ advises suppliers to proactively seek clarification where contractual terms or requirements are unclear. BCA has also highlighted the importance of clear responses to tenderers’ queries so that submissions are fit for purpose.

Picture by Anastassia Anufrieva on Unsplash

Treating the Submission as a Collection of Separate Documents

A tender submission should tell one consistent story.

For example, the proposed programme should align with the methodology, manpower proposal and pricing assumptions. If one section proposes a particular construction sequence while another assumes a completely different approach, evaluators may question the reliability of the bid.

This becomes especially important where tenders use separate technical and price submissions. Some Singapore public sector tenders use two-envelope systems requiring technical and price documents to be submitted separately.

Consistency matters: scope + programme + resources + methodology + price should work together.

Uploading the Right Information the Wrong Way

Even a well-prepared bid can run into trouble during submission.

Electronic procurement platforms may have requirements relating to file types, document sizes, submission fields and closing times. GeBIZ, for example, advises suppliers to prepare files for uploading and notes a 35MB per-file limit in its supplier checklist.

A final submission check should therefore include:

Correct file uploaded
Correct version uploaded
Required fields completed
File opens correctly
Supporting documents attached
Electronic tender price matches the pricing schedule
Submission successfully recorded before the deadline

Avoiding Tender Submission Mistakes

The tender process rewards preparation as much as estimating accuracy. A practical approach is to create an internal tender submission checklist covering compliance, pricing, technical documents, eligibility and final upload.

For contractors in Singapore, this also means keeping up with changes to public procurement frameworks. BCA continues to develop approaches that place greater emphasis on quality, performance and value alongside price.

The goal is not simply to submit a bid. It is to submit a complete, accurate and compliant tender that clearly demonstrates the contractor’s ability to deliver the project.

Frequently Asked Questions

What is the biggest common mistake in a construction tender submission?

Answer: One of the most common mistakes is failing to follow the tender instructions precisely. Missing a mandatory document, requirement or deadline can create problems even when the pricing is accurate.

Should contractors always submit the lowest tender price?

Answer: Not necessarily. Some procurement systems evaluate both price and quality. Contractors should understand the stated tender evaluation criteria before deciding how to structure their bid.

Why is tender pricing so important?

Answer: Errors in quantities, rates, calculations or totals can affect the accuracy and credibility of a tender submission. Pricing should be independently checked before submission.

What should be included in a tender submission checklist?

Answer: A checklist can cover eligibility, tender documents, pricing, technical information, declarations, supporting documents, file formats, submission requirements and deadlines.

Are construction tender requirements the same in every country?

Answer: No. Public and private procurement procedures vary by country, client and contract. Contractors should always follow the specific tender documents issued for the project.