Tendering: The Complete Guide to Types & Process

Tendering is how organisations buy through open competition. Instead of picking a supplier by instinct or habit, the buyer publishes a clear requirement, invites suppliers to submit sealed offers, and awards the contract to whichever bid represents the best value against criteria set in advance. It is the backbone of public procurement and a discipline more and more private buyers adopt for their larger spend. This guide covers what tendering is, the main types of tender, the process step by step, how it differs from an RFP, the split between public and private tendering, and how e-tendering has modernised the whole thing.

What is tendering?

Tendering is a structured procurement method in which a buyer invites suppliers to submit competitive offers, known as tenders or bids, for a specified contract. The buyer issues an invitation to tender that describes exactly what is needed, the terms that apply, and how offers will be judged. Suppliers respond by the deadline with a sealed bid setting out their solution and price. The buyer then opens every bid, scores them against the same published criteria, and awards the contract to the strongest offer.

The point of the exercise is competition on equal terms. Because the requirement is written down once and shared with everyone, every supplier answers the same question, and because the criteria are fixed before any bid is opened, the buyer cannot move the goalposts to favour a preferred name. That combination of a common requirement and a fixed yardstick is what separates tendering from an ordinary purchasing conversation. It also produces a record that stands up to scrutiny, which is why the method is mandatory for most public spending and increasingly popular for high-value private contracts.

Types of tender

Tendering is not a single procedure. Buyers choose a route that matches the value, complexity and risk of what they are buying. The main types differ in who is allowed to bid and how much room there is to negotiate:

Open tendering casts the widest net and is the default for routine public contracts, where the duty to treat every supplier equally outweighs the cost of reading more bids. Selective or restricted tendering trades some of that breadth for depth: the buyer first runs a pre-qualification stage to confirm which suppliers have the capability and financial standing to deliver, then invites only those firms to submit a full bid. That keeps evaluation manageable on complex work. Negotiated tendering, sometimes described as a direct call for bids to a chosen few, applies when competition is impractical, for instance when only one supplier can deliver a specialist item or when an urgent need leaves no time for a full competition. Public buyers may only use it in tightly defined circumstances.

Cutting across these is the split between single-stage and two-stage tendering. In a single-stage tender the buyer asks for a complete, priced offer in one go and awards on that basis. A two-stage tender splits the decision: in the first stage suppliers are chosen on their approach, experience and design capability, often before the full scope is finalised; in the second stage the buyer works up the detail with the selected supplier and fixes the price. Two-stage suits construction and large projects where the design is still evolving and early supplier input is valuable.

The tendering process step by step

Whatever the type, most tenders move through the same sequence. Treating each part as a distinct stage keeps the competition fair and the timetable honest:

• Plan and specify. Define the requirement, agree the evaluation criteria and weightings, and prepare the tender documents.
• Advertise or invite. Publish an open notice, or issue the invitation to a pre-qualified shortlist.
• Clarify. Run a questions window so bidders can resolve ambiguities, with answers shared to everyone.
• Receive bids. Collect sealed offers by the deadline and keep them unopened until the closing time.
• Evaluate. Score each bid against the published criteria, ideally with more than one assessor.
• Award and debrief. Select the winning bid, notify all bidders, and hold a standstill or debrief where required.

The discipline lives in the order. Fixing criteria before advertising, sharing clarifications with the whole field, and keeping bids sealed until the deadline are not bureaucratic habits; they are what make the outcome defensible if a losing supplier ever challenges it.

Tendering vs an RFP

People use tender and RFP almost interchangeably, and the boundary genuinely is blurry, but there is a useful distinction. A tender, particularly a formal request for tender, usually means a rules-bound competition with a fixed requirement, where suppliers price a defined scope and the buyer awards largely on stated criteria. An RFP is typically more open-ended: the buyer describes a problem and asks suppliers to propose how they would solve it, leaving more room for different approaches and for dialogue.

In practice many buyers blend the two, and the label often just reflects local convention. If you want to go deeper on the proposal-led route, our RFP guide covers how to write one and score the responses. The important thing is not the name on the document but that whichever you run, you fix the criteria first and apply them consistently.

Public versus private tendering

Tendering looks different depending on who is buying. In government procurement the process is governed by law. Contracts above set thresholds must be advertised openly, minimum timescales apply, evaluation must follow published criteria, and unsuccessful bidders have the right to a debrief and, in many jurisdictions, a standstill period during which they can challenge the decision. The goal is not just value for money but demonstrable fairness and the prevention of favouritism, because the money being spent is public.

Private tendering borrows the same mechanics but keeps far more discretion. A company can choose whom to invite, set its own criteria, negotiate more freely, and is not bound by statutory notice periods or challenge rights. Private buyers adopt formal tendering mainly because it works: it drives better prices through genuine competition, creates a clear record of why a supplier was chosen, and reduces the risk of internal disputes over a big award. The rigour is optional, but on high-value spend it usually pays for itself.

Evaluation and award

Evaluation is where a tender is won or lost, and structured scoring is what makes it defensible. Each criterion carries a weight agreed before bids were opened, every bid is scored on the same scale, and at least two assessors review independently before comparing notes. That catches the halo effect, where one impressive section flatters an entire bid, and it produces a written trail explaining exactly why the winner won. Most modern tenders award on the most economically advantageous tender rather than lowest price alone, balancing cost against quality, delivery and risk.

A quick worked example shows how that works in practice. Suppose a contract will be decided on four things, with weights fixed before any bid is opened: technical quality at forty per cent, price at thirty, delivery at twenty, and support at ten. Each bid is scored out of ten on every criterion, the raw scores are multiplied by their weights, and the weighted totals are compared. One bid might score eight on quality but only six on price, giving weighted marks of 3.2 and 1.8; a rival might reverse that, scoring seven on quality and nine on price for weighted marks of 2.8 and 2.7. Add delivery and support the same way and the two totals often land within a tenth of each other. The precise numbers matter less than the discipline behind them: agree the weights first, score every bid on the same scale, and let the arithmetic do the comparing rather than a gut feeling in the room. Because every mark is recorded against a published criterion, the buyer can explain to any bidder exactly what the decision turned on.

Award is not the end. Successful and unsuccessful bidders are notified, and in the public sector a standstill period may follow before the contract is signed, giving losing suppliers a window to raise concerns. A short, honest debrief for the firms that did not win is worth the effort: it keeps good suppliers willing to bid next time, which protects the competitiveness of every future tender you run.

Benefits and challenges

Tendering earns its place because the benefits are real, but it is not free of friction. It helps to see both sides before committing to the method for a given purchase:

• Better value. Genuine competition tends to sharpen prices and improve what suppliers offer.
• Transparency. A documented process shows clearly why a contract was awarded and to whom.
• Fair access. Open competition widens the field and gives new or smaller suppliers a route in.
• Reduced risk. Pre-qualification and structured scoring filter out suppliers who cannot deliver.
• Administrative cost. Writing documents, answering clarifications and scoring bids takes real time.
• Slower for the buyer. Formal timescales and notice periods mean tendering is not quick.

The honest summary is that tendering trades speed for rigour. For a small, routine purchase that trade is rarely worth it. For a large, scrutinised or long-term contract, the discipline usually saves far more than it costs, both in price and in avoided disputes.

How e-tendering modernises the process

Most of the friction in traditional tendering comes from paper and email: printed documents, posted or couriered bids, version drift in clarifications, and scores scattered across spreadsheets and inboxes. E-tendering moves the entire cycle online. Buyers publish the notice and documents on a portal, suppliers download them and submit bids electronically, clarifications are broadcast to everyone at once, and bids stay locked until the closing time. Evaluation is captured in the same system, so the audit trail builds itself as the process runs.

The gains are practical. Distribution is instant and costs nothing, the sealed-bid guarantee is enforced by the software rather than by trust, and the record is complete without anyone assembling it by hand. Our guide to e-tendering walks through how the electronic process works end to end, and the e-tendering portal guide looks at the platforms buyers and suppliers actually log into. For public buyers in particular, the audit trail and equal-treatment controls are not a nice-to-have; they are how the process meets the rules.

This is the part of procurement that ProcureWave is built to handle. The platform runs a tender from the notice through to award in one place, keeps every bid sealed until the deadline, structures the scoring so comparisons are like for like, and connects the winning bid straight through to a purchase order. If you want to see how it would fit your own tendering, you can book a walkthrough and we will run it against a live example.

Getting tendering right

Good tendering is less about paperwork and more about discipline. Specify the requirement clearly so every supplier answers the same question. Pick the type of tender that matches the value and complexity of what you are buying, rather than defaulting to whatever you ran last time. Fix your evaluation criteria before you issue anything, and score every bid against exactly those. Treat unsuccessful suppliers with respect so they come back for the next competition. Do that consistently and each tender becomes easier than the last, backed by a better-mapped market and a record you can stand behind. Move it online and the whole thing gets faster and cleaner without giving up any of the fairness that makes tendering worth doing in the first place.

Frequently asked questions

What is tendering in simple terms?

Tendering is the formal process a buyer uses to invite suppliers to submit competing offers for a defined piece of work or supply. The buyer sets out the requirement, suppliers respond with a sealed bid covering their approach and price, and the buyer evaluates every bid against published criteria before awarding the contract to the best offer.

What is the difference between tendering and an RFP?

The two overlap and the labels vary by country. In broad terms a tender, often called an invitation to tender, tends to be a formal, rules-bound competition common in public procurement, while an RFP (request for proposal) is more flexible and asks suppliers to propose how they would solve a problem. Both invite competing offers and score them against set criteria.

What are the main types of tender?

The most common are open tendering, where any qualified supplier may bid; selective or restricted tendering, where only pre-qualified suppliers are invited; and negotiated tendering, where the buyer deals with one or a few suppliers directly. Complex projects often run a two-stage tender that separates the technical selection from the final commercial offer.

How long does a tendering process take?

A straightforward tender might run four to eight weeks from issue to award. Large public contracts often take several months once mandatory notice periods, clarifications and formal evaluation are counted. Running the process electronically shortens the administrative parts, though the statutory timescales still apply.

What makes a tender fair?

Fairness comes from treating every bidder the same way: one clear requirement, the same information for all, published evaluation criteria fixed before bids are opened, and a documented scoring process. That transparency is what lets an unsuccessful supplier trust the outcome and, in public procurement, what the rules require.