Open Tender: Advantages and Disadvantages Explained
TL;DR: Open tendering is a procurement method where any interested supplier can submit a bid against a public notice. Its main advantages are maximum competition, transparency and a defensible award; its main disadvantages are long minimum timelines (25 to 35 days in UK and EU law, 30 days under the US FAR), heavy evaluation workload and no room to negotiate.
An open tender is a single-stage, publicly advertised competition in which there is no restriction on who can submit a tender. The advantages of open tendering are wide supplier access, the best chance of a competitive price, a transparent audit trail and a lower risk of favouritism or bid rigging. The disadvantages are slow statutory timelines, a large volume of bids to evaluate (including unsuitable ones), fixed specifications with no negotiation, and a tendency to award on lowest price rather than best fit. Use an open tender when the requirement is clear, the market is broad and the rules or the value of the purchase demand public advertising.
How do EU, UK and US law define it?
An open tender (also called open tendering, open procedure, or in US federal buying, sealed bidding with full and open competition) is a procurement procedure in which the buyer publishes a contract notice and accepts a complete bid from any supplier that wants to respond. There is no shortlist and no invitation list.
The main legal frameworks define it in almost the same way:
- EU Directive 2014/24/EU, Article 27: "any interested economic operator may submit a tender in response to a call for competition."
- UK Procurement Act 2023, section 20: the open procedure is "a single stage procedure" where there is no restriction on who can submit tenders. The Act came into force on 24 February 2025 and gives buyers two competitive procedures: the open procedure and the competitive flexible procedure.
- US Federal Acquisition Regulation (FAR) 6.102(a): sealed bids are one of the competitive procedures that satisfy the requirement for "full and open competition."
What are the steps, from notice to award?
The open tendering process runs in five steps, and the rules lock the buyer into each one:
- Contract notice: the buyer publishes the opportunity (for example on Find a Tender in the UK, TED in the EU, or SAM.gov in the US) with the specification, eligibility criteria, evaluation criteria and deadline.
- Tendering period: suppliers prepare full bids. The minimum period is set by law (see the table below).
- Bid opening: bids are opened after the deadline, and late bids are normally rejected.
- Evaluation: every compliant bid is scored against the published criteria. Criteria cannot be changed after the notice.
- Award and contract: the winner is notified, and in UK and EU public procurement a standstill period runs before signature so losing bidders can challenge.
What are the advantages of open tendering?
The advantages of open tendering come from one fact: nobody is shut out.
- Maximum competition. Every capable supplier can bid, including ones the buyer has never heard of. More bids generally means sharper pricing on standardised goods and works.
- Transparency and auditability. The notice, criteria and deadline are public, so every decision can be traced. This is why public bodies default to it and why the Open Contracting Data Standard (OCDS) is built around publishing each stage.
- Lower risk of favouritism and corruption. With no invitation list, a buyer cannot quietly exclude a competitor or steer work to a friend. That makes collusion such as bid rigging harder to sustain.
- Access for SMEs and new entrants. Small and new suppliers get the same document and deadline as incumbents.
- Market discovery. An open tender shows the buyer the real spread of prices and approaches in a market, which is useful when no recent benchmark exists.
- A defensible award. In US sealed bidding, FAR 14.408-1(a) requires award to the responsible bidder whose conforming bid is most advantageous "considering only price and the price-related factors." When the outcome is challenged, the buyer can point to an objective rule.
What are the disadvantages of an open tender?
The disadvantages of open tendering are the cost of that openness.
- Long minimum timelines. The law sets floors the buyer cannot shorten without a valid reason: 35 days under EU Article 27, 25 to 35 days under the UK Act, and 30 calendar days under FAR 14.202-1 when a synopsis is required. Evaluation and any standstill period come on top of that.
- High evaluation workload. Every compliant bid must be assessed, including bids from suppliers that were never realistic. FAR has no cap on bidders, and the EU and UK open procedures have none either.
- Bidder cost and fatigue. Every supplier prepares a full bid with a low chance of winning, so strong suppliers sometimes decline to bid at all.
- No negotiation. Under the UK Act the open procedure allows no negotiation: all information must be in the tender. Under FAR 14.104, sealed bidding requires firm-fixed-price contracts (with economic price adjustment as the only exception).
- Rigid specifications. If the specification is wrong, the buyer usually has to cancel and re-tender rather than fix it mid-process.
- Lowest-price bias. Where award rests mainly on price, a bidder can win with an unrealistic price and recover margin through change orders. EU Article 69 lets buyers investigate abnormally low tenders, which tells you how common the problem is.
- Thin response risk. Open does not guarantee many bids. FAR 14.408-1(b) says that if fewer than three bids are received, the contracting officer must examine why, but award is still made.
Open vs selective vs negotiated: which method fits?
Open tendering is one of several methods of tendering, and the type of tender matters because it decides who can bid, how long it takes and whether you can negotiate. This table compares the main methods:
| Method | Who can bid | Minimum timeline (law) | Negotiation | Best for |
|---|---|---|---|---|
| Open tender | Anyone | EU 35 days (Art. 27); UK 25 to 35 days; US 30 days (FAR 14.202-1) | No | Clear specs, broad market, public money |
| Selective / restricted tender | Shortlisted suppliers after a qualification stage | EU 30 days for requests plus tender period (Art. 28); minimum 5 candidates (Art. 65) | No | Complex works where prequalification saves effort |
| Competitive flexible procedure (UK) | Designed by buyer, can shortlist | Set per stage under the Act | Yes, if built in | Services or solutions where the answer is not fully known |
| Negotiated tender | One or a few invited suppliers | Depends on justification | Yes | Specialist, urgent or follow-on work |
| Request for quotation (private sector) | Suppliers the buyer invites | None set by law | Optional | Routine purchases, repeat buys, SMB procurement |
A practical rule: if three or more qualified suppliers exist and the specification is stable, an open or wide competition will usually price well. If you already know the five suppliers that can do the work, a competitive bidding process with a shortlist gets most of the price benefit in a fraction of the time.
What minimum bid periods apply by country?
Minimum time limits for an open tender are the legal floor between publishing the notice and the bid deadline:
| Jurisdiction | Standard minimum | Reductions |
|---|---|---|
| EU (Directive 2014/24/EU, Art. 27) | 35 days from dispatch of contract notice | 15 days with a prior information notice sent 35 days to 12 months earlier; not less than 15 days for substantiated urgency; minus 5 days if electronic tenders are accepted |
| UK (Procurement Act 2023) | 25 days if electronic and all documents issued with the notice; 30 days if one of those is missing; 35 days if neither | 10 days with a qualifying planned procurement notice, urgency or a dynamic market |
| US federal (FAR 14.202-1, 5.203) | 30 calendar days when synopsis is required; 45 days for research and development | Contracting officer sets a "reasonable time" below the simplified acquisition threshold |
FAR 14.202-1(b) is also a useful warning for private buyers: unduly short bidding time can exclude sources and force others to price in contingencies "that, with additional time, could be eliminated."
How can buyers limit the downsides?
You reduce the disadvantages of an open tender by front-loading the work:
- Publish complete documents with the notice. In the UK this alone moves the floor from 30 or 35 days to 25.
- Set pass/fail eligibility criteria first (insurance, certifications, turnover) so unsuitable bids are rejected quickly before scoring. See our guide to supplier prequalification.
- Use a structured response form so every bidder prices the same line items and bids can be compared side by side.
- Test for abnormally low prices before award, and ask bidders to explain them.
- Seal the bids until the deadline so nobody can see or react to a competitor's price. Our sealed bid entry explains how this works.
Should a small business use open tendering?
A small or mid-sized private business is not bound by the EU, UK or FAR rules, so open tendering is a choice rather than a duty. For most SMB purchases a full public tender is too slow: a 25 to 35 day bid window plus evaluation is out of proportion for a routine order. What SMBs can borrow is the discipline: written specifications, fixed deadlines, sealed prices and published criteria, applied to an invited list of three to ten suppliers. The informal procurement guide covers when even that is more than you need.
Tools such as AuraVMS, RFQ software for SMBs, support that middle path. AuraVMS starts at $5/month. In it, suppliers respond to an RFQ without creating an account, bids can be anonymous, and quotes are ranked L1/L2/L3 automatically for side-by-side comparison.
FAQ
What is the main advantage of open tendering?
The main advantage of open tendering is maximum competition with full transparency: any supplier can bid against the same public notice and criteria, which tends to produce competitive prices and a decision that can be defended in an audit or challenge.
What is the main disadvantage of open tendering?
The main disadvantage is time and effort. Legal minimum bid periods run 25 to 35 days in the UK and EU and 30 days in US federal buying, and the buyer must evaluate every compliant bid.
What is the difference between open tendering and selective tendering?
In open tendering anyone can bid. In selective (restricted) tendering suppliers first pass a qualification stage and only shortlisted firms are invited; EU Article 65 requires at least five candidates in a restricted procedure.
Is negotiation allowed in an open tender?
No. Under the UK Procurement Act 2023 the open procedure is single stage with no negotiation, and US sealed bidding awards on price and price-related factors only. Use the competitive flexible procedure or a negotiated method if you need to negotiate.
Why is open tendering used in construction?
Construction projects often have complete drawings and bills of quantities, so bids are directly comparable on price, and public construction contracts must usually be advertised. That makes open tendering a natural fit.
What happens if an open tender gets fewer than three bids?
Under FAR 14.408-1(b) the contracting officer must examine why so few bids came in and take corrective action for future solicitations, but the award can still be made.