How to Write a Tender Document for Construction

Learning how to prepare a tender is a skill most quantity surveyors pick up by trial and error - usually after a tender pack goes out with a gap in it, and the queries start flooding back. A tender document is the single artefact that determines whether an employer receives comparable, compliant bids or a pile of qualified, caveat-heavy prices that are impossible to evaluate fairly.

This guide is written from the employer's or QS's side of the table - the person compiling the tender, not the contractor responding to it. That distinction matters, because the discipline of assembling a tender pack is different from the discipline of pricing one. Get it right and you reduce queries, shorten the tender period, and set up a contract with far less room for argument once work starts on site.

We'll cover what a tender document package should actually contain, how to write instructions to tenderers that close down ambiguity rather than inviting it, how to set a tender period and evaluation criteria that are fair and defensible, and the mistakes that most commonly produce non-compliant bids or post-contract disputes.

By the end, you'll have a practical, repeatable process for compiling a tender pack - plus a sense of what a downloadable checklist template can add to your own workflow.

What Should Be in a Tender Document Package

The core documents every pack needs

A construction tender pack is not one document - it's a coordinated set of them, each doing a different job. The invitation to tender letter sets the scene: project name, employer, tender return date and instructions on how to obtain the rest of the pack. Behind it sit instructions to tenderers, the form of tender for bidders to sign and return, drawings and specification describing what's being built, the pricing document (a bill of quantities, schedule of rates, or activity schedule depending on procurement route), the proposed contract conditions (usually a JCT or NEC form with any employer amendments), and a programme or key dates schedule.

Why consistency across documents matters more than completeness

It's possible to include every document on the list and still produce a bad tender pack, because the documents contradict each other. A specification that names a product the drawing shows differently, or a bill of quantities item that doesn't match the specification clause it references, forces every bidder to guess which one governs - and different bidders will guess differently, which destroys the comparability the whole exercise depends on. Before a pack goes out, someone needs to read it end to end, not document by document, checking that drawings, specification and pricing document agree with each other.

Writing Clear Instructions to Tenderers

What instructions to tenderers actually need to cover

Instructions to tenderers is the document bidders read first and refer back to constantly - it's the rulebook for the whole process. It should state, in plain and unambiguous language: the return date and time, the required format (sealed envelope, electronic portal, or both), the number of copies or files required, what constitutes a compliant bid, how queries should be raised and by when, and how the tender will be evaluated. Every one of those points should have exactly one interpretation. If a bidder can read a clause two ways, at least one of them will read it the way that suits their bid.

Reducing queries by anticipating them

The volume of tender queries a pack generates is a fairly reliable measure of how well it was written. Before issuing, it's worth running the pack past someone who hasn't seen the project before and asking them to flag anything unclear - a fresh reader catches ambiguity that someone close to the design has stopped noticing. Common gaps include unclear site access arrangements, undefined working hours, missing information on existing services, and specification clauses that reference drawings using different revision numbers than the drawings actually issued.

• State the tender return deadline as an exact date and time, not "within four weeks"
• Confirm whether late tenders will be accepted, rejected outright, or accepted at the employer's discretion
• Set a single point of contact and a cut-off date for queries
• Publish all query responses to every bidder simultaneously, never to one bidder alone
• Specify exactly what counts as a non-compliant or qualified bid before it's submitted, not after

Setting a Fair and Realistic Tender Period

The tender period is the single most common thing employers get wrong, usually by making it too short. A rushed tender period doesn't produce a faster start on site - it produces rushed pricing, more qualifications, more post-tender queries, and bids that aren't genuinely comparable because different contractors made different assumptions to fill gaps they didn't have time to check.

As a rough guide, a straightforward single-stage tender for a mid-size building project needs four to six weeks from issue to return. Complex projects, those requiring subcontractor design input, or packages issued over a holiday period need longer. The tender period should also build in time for a mid-tender interview or site visit, and a clearly stated cut-off for queries that leaves enough runway for the employer's team to respond before the return date - not the day before it.

Setting Transparent Evaluation Criteria

Deciding the price-quality weighting before, not after

Every tender pack should state how bids will be scored before a single price comes back - not once the employer has seen who's cheapest. A typical evaluation splits the score between price and quality, commonly somewhere between 60/40 and 80/20 depending on the complexity and risk of the project; a straightforward refurbishment might weight heavily toward price, while a technically demanding new-build might weight quality higher to reward method, programme and resourcing proposals.

Publishing the criteria, not just applying them

Stating the weighting in the instructions to tenderers, along with the specific sub-criteria being scored (method statement, programme, key personnel, health and safety record, sustainability approach), lets bidders put effort where it actually counts and gives the employer a defensible, auditable basis for the award decision. Evaluating on undisclosed or shifting criteria is one of the fastest ways to attract a formal challenge from an unsuccessful bidder, particularly on public sector work subject to procurement regulations.

A Step-by-Step Process for Compiling a Tender Pack

Treat tender pack preparation as a sequence, not a single task done the week before issue:

• Confirm the procurement route and form of contract before drafting anything else - it dictates what documents you actually need
• Assemble drawings and specification first, and check they agree with each other before the pricing document is built from them
• Build the pricing document (BoQ, schedule of rates or activity schedule) directly from the checked drawings and specification
• Draft instructions to tenderers, form of tender and the evaluation criteria as a single coherent package
• Have someone outside the immediate project team read the full pack end to end for contradictions and gaps
• Set the tender return date only once the pack is genuinely complete - don't fix the date first and compress the content to fit it
• Issue to a shortlist appropriate to project size, and confirm receipt with every bidder

Common Mistakes That Cause Non-Compliant Bids or Disputes

Most tender problems trace back to a handful of recurring mistakes, and almost all of them are avoidable at the drafting stage rather than fixable once bids are back:

• Inconsistent information across drawings, specification and pricing documents, forcing bidders to guess which one governs
• Vague or undefined terms in the specification ("suitable", "as required", "to match existing") with no test or standard to measure against
• A tender period too short for the complexity of the project, producing rushed, heavily qualified prices
• Evaluation criteria that are undisclosed, vague, or changed after bids are received
• Query responses shared with only one bidder instead of circulated to all
• Contract conditions that conflict with statements made elsewhere in the tender pack
• No clear statement of what makes a bid non-compliant, leaving room for argument about whether a qualified bid should be accepted

Each of these looks minor in isolation. Together, they're the difference between a tender process that produces comparable bids and a clean contract award, and one that produces disputes about scope, price and interpretation for the life of the project.

Frequently Asked Questions

How do I prepare a tender for a construction project?

Confirm the procurement route and contract form, assemble and cross-check drawings and specification, build the pricing document from them, then draft instructions to tenderers, the form of tender and evaluation criteria as one coherent package before issuing to a shortlist of bidders.

What documents should be included in a tender document?

A complete pack typically includes the invitation to tender letter, instructions to tenderers, form of tender, drawings, specification, pricing document (bill of quantities or schedule of rates), proposed contract conditions and a programme or key dates schedule.

How long should a construction tender period be?

A straightforward single-stage tender for a mid-size project typically needs four to six weeks from issue to return. Complex, design-intensive or holiday-period tenders need longer to avoid rushed, heavily qualified pricing.

What is the difference between an invitation to tender and instructions to tenderers?

The invitation to tender is the covering letter announcing the opportunity and setting out how to obtain the full pack. Instructions to tenderers is the detailed rulebook governing format, deadlines, queries and how bids will be evaluated.

How should tender evaluation criteria be weighted?

Most construction tenders split scoring between price and quality, commonly somewhere between 60/40 and 80/20 depending on project complexity. The weighting and sub-criteria should be published in the tender pack before bids are received, not decided afterwards.

What makes a bid non-compliant?

A bid is generally non-compliant if it's late, submitted in the wrong format, missing required documents, or qualified with conditions the instructions to tenderers said would not be accepted. The tender pack should state these rules clearly before bids go out.

Why do tender documents cause disputes later in a project?

Disputes often trace back to inconsistencies between drawings, specification and pricing documents at tender stage. If different documents say different things, the contractor prices one interpretation and the employer expects another, and the gap surfaces as a variation or claim during construction.

Can a tender document template save time?

Yes. A standard tender document checklist or template - covering the core documents, a query log format and an evaluation scoring sheet - speeds up preparation and reduces the risk of missing a required section, especially for teams running several tenders a year.

Final Thoughts

Preparing a tender document well is unglamorous work - it's checking, cross-referencing and closing down ambiguity rather than anything that feels like the interesting part of the job. But it's also where a huge amount of downstream risk gets created or removed. A tender pack that's internally consistent, gives bidders a realistic period to price, and states its evaluation criteria upfront produces genuinely comparable bids and a contract with far less room for argument later.

The skill compounds. Every tender pack you prepare teaches you where the last one had gaps, and a QS or commercial manager who treats tender preparation as a repeatable process - rather than reinventing it each time - saves real time and avoids the queries and disputes that poor documentation invites.

Want the full picture? Want a ready-made tender document checklist?

A downloadable tender document checklist and template - covering the core document list, a query log and an evaluation scoring sheet - is a natural next step for QSs who run tenders regularly. Keep an eye on Surveyor Success for template releases, and in the meantime, read our guides on the Construction Tender Process UK and Pre-Qualification Questionnaires (PQQ) in Construction for more on what happens either side of the tender pack itself.