How to bid for UK public sector contracts

The market is smaller than you think, in a good way

Most firms who have never bid assume public sector work means enormous frameworks and three years of audited accounts. That describes a minority of contracts by number.

About 356 contracts are awarded every working day across the four UK portals. Nobody reads that volume, which is why targeting matters more than coverage.

Where opportunities are published

There is no single place. UK public procurement is split across four national portals, and then again across the e-sourcing systems buyers actually run tenders on.

A notice on a national portal usually points at a different system for the actual tender: Proactis, In-Tend, Jaggaer, Atamis, Delta and others. Registering on one does not register you on any of the rest, and the tender documents only exist on the named system.

Our sources page sets out what each portal covers and where the gaps are.

What the rules require of buyers

The Procurement Act 2023 governs most procurement in England, Wales and Northern Ireland, in force since 24 February 2025, with separate arrangements in Scotland. You do not need to know the Act. You need to know what it forces buyers to do, because that is what you can rely on.

• Publish the evaluation criteria and how they are weighted, before bids are submitted.
• Score against those published criteria, not against undisclosed preferences or prior knowledge of a supplier.
• Treat bidders equally and answer clarifications consistently.
• Publish the award, including who won.

The practical consequence: the tender document tells you exactly where the marks are. Most losing bids ignore that and write what the supplier wanted to say instead.

Get ready before you find an opportunity

Tender windows are commonly three to four weeks. That is not enough time to obtain an insurance certificate, write a modern slavery policy and chase a referee. Assemble a readiness file first, and keep it current.

• Legal name, company number, registered address, ownership.
• Insurance certificates at the levels buyers in your sector ask for.
• Two or three years of accounts, and an explanation if they are weak.
• Policies: data protection, information security, health and safety, equality, modern slavery, anti-bribery, environmental, business continuity.
• Three to five case studies with client, scope, dates, your actual role and a measurable result.
• Named team, CVs, and honest delivery capacity.
• A pricing model you can defend line by line.

The case studies are the part most firms are weakest on, and the part evaluators lean on hardest.

Qualify hard before you write

The most valuable skill in bidding is declining. Every hour spent on an unwinnable tender is an hour not spent on a winnable one, and the tender documents almost always tell you which it is on the first read.

We have set out the questions worth asking in deciding whether to bid.

Write for the marking scheme

A tender response is a scored document, not a brochure. The evaluator has a question, a marking guide, a pile of submissions and limited time. Your job is to make the evidence impossible to miss.

The GOV.UK guidance for SMEs is blunt about why bids fail: failing to answer the specific question, failing to address the full specification, and insufficient detail. None of those are about capability.

The mechanics are in writing a tender response that scores. If you would rather have help, UK bid writing services range from a review of a bid you have written to writing the whole response.

Price from your delivery model

Build the price from what delivery actually costs: labour, management, travel, equipment, software, insurance, subcontractors, overhead, contingency and margin. Do not reverse-engineer it from a guess at the budget, and do not cut it to look competitive without knowing what you have cut.

The cheapest bid does not automatically win. Most competitions use a quality and price model with published weightings, and many set a minimum quality threshold that a cheap, thin bid fails outright. The weighting is in the documents. Read it before deciding how much effort to put where.

Submit properly

1. Work backwards from the deadline, not forwards from today.
2. Ask clarification questions early, through the portal only. Answers usually go to every bidder, so do not reveal your approach in the question.
3. Check every mandatory attachment, word limit, file format and signature against the instructions.
4. Upload well before the deadline. Portals reject late submissions automatically and there is no appeal to a human.
5. Keep a copy of exactly what you submitted.

After the decision

If you lose, ask for feedback. You are entitled to know how you scored against the published criteria, and the gap between your score and the winner's tells you whether you were close or not in the race. That is the difference between refining a bid and changing your target market. Getting feedback when you lose explains what the assessment summary must contain.

If you win, you should be paid within 30 days of a valid, undisputed invoice, and the same term passes down to your own subcontractors (sections 68 and 73 of the Procurement Act 2023).

Then look at who won and when their contract ends, because that is your next opportunity and you now have years of notice.

Start earlier than the tender

The uncomfortable truth of public sector selling is that by the time a tender is published, the specification is written, often with input from the incumbent. Reading notices puts you in a competition that has already been shaped by someone else.

Contract end dates are published in award notices, which makes most re-tenders visible months or years ahead. That is the window in which a conversation is still possible. We cover how to use it in finding contracts before they are re-tendered, and you can browse what is coming on our expiring contracts pages.