Bid Writing for Construction Subcontractors: How to Write Tenders That Score

Most specialist subcontractors and SME civils firms do not lose tenders because their work is poor. They lose them because the written answers do not show the evaluator what the scoring guide asks for. A team that runs a tidy, safe site can still score a 2 out of 5 on a quality question if the answer is generic, unevidenced or answers a different question.

This guide covers bid writing for construction subcontractors bidding to tier 1 contractors and public buyers: how the construction tender process runs, how quality questions are scored, and how to write method statements, case study evidence and social value answers that pick up marks. If you are still getting approved in the first place, start with our guides to Constructionline, CHAS and PAS 91 and getting onto a tier 1 supply chain. This post picks up once you are invited to bid.

How the construction tender process works

Public procurement in the UK changed on 24 February 2025, when the Procurement Act 2023 came into force.¹ Under the Act, a competitive tender takes one of two forms: an open procedure, which is a single stage where anyone interested can submit a tender, or a competitive flexible procedure, which covers any other design the buyer sets out, often with a selection stage first.²

Tier 1 contractors buying their own supply chain packages are not bound by the Act, but most run something similar: a pre-qualification questionnaire (PQQ), then an invitation to tender with quality questions and a priced schedule, then clarifications or an interview. The stages below cover both.

The PQQ, now called a selection questionnaire or conditions of participation in public work, is mostly pass or fail: insurance, accreditations, financial standing, health and safety. The scored writing usually comes at the tender stage. That is where this guide concentrates.

Read the evaluation criteria before you write

Public buyers have to tell you how they will score you. Cabinet Office guidance on assessing tenders says that if there is more than one criterion, the contracting authority must set out the relative importance of all of them, through weightings, a ranking or another description.³ The assessment methodology, including any scoring matrices evaluators will use, has to be in the tender notice or the tender documents.³ The contract goes to the most advantageous tender (MAT), the term that replaced the most economically advantageous tender (MEAT) under the old rules.³

So before anyone drafts a word, pull out four things for each question: its weighting, the scoring scale and what each band says, any minimum score that disqualifies a tender, and the word or page limit. Tier 1 invitations to tender are less consistent, but a short email to the buyer asking how quality and price are weighted is normal and usually answered.

The weighting tells you where to spend time. The scoring scale tells you what a top-band answer has to contain. If the top band says “fully meets the requirement with evidence of delivery on comparable schemes”, an answer without a comparable scheme cannot reach it, however well written.

Answer the question that was asked

Most low scores come from answers that are about the right subject but do not address the question. A question on how you will manage the interface with other trades gets a page on the company's safety culture. A question with three parts gets an answer to the first two.

• Break the question into parts. List every “how”, “what” and “demonstrate” in it, plus every point in the scoring guidance, and make each a subheading.
• Answer in the same order. Evaluators score against a sheet. Make it easy for them to tick each point off.
• Use their words. If the question says “programme assurance”, use that phrase, not “keeping on schedule”.
• Write about this job. Name the site, the client's constraints and the risks in their documents. An answer that could be pasted into any tender scores like one.
• Lead with the answer. Put the commitment in the first sentence, then the method, then the evidence.

Evidence and case studies that score

Evaluators are told to look for evidence, not intent. “We have extensive experience of live highway works” is a claim. “On a 14-week drainage package for a tier 1 on a live A-road in 2025, we worked in overnight possessions and handed back every shift on time” is evidence. Use the second kind, and only where it is true.

A good case study for a tender covers the client type, the scope and value band, the constraints, what you did about them and a measurable outcome: programme, defects, safety record or a reference the buyer can call. Keep five or six of these written up and current, chosen to cover your main trades, sectors and package sizes.

Write the same projects up on your website too. Buyers and tier 1 supply chain managers check you online before and during a tender, so the evidence in the bid should match what they find. Our post on digital marketing for civil engineering firms covers how to put tender evidence on your site in a form buyers and search engines can read.

Method statements that show how, on this job

A tender method statement is not the site RAMS. It is a description, for an evaluator who may not be an engineer, of how you will deliver this package safely, on programme and to quality. The strongest ones follow the sequence of the work.

• Sequence: the main activities in order, with the plant, gangs and supervision for each.
• Site-specific risks: the three or four that matter on this job, such as services, access, live traffic, ground conditions or neighbours, and what you will do about each.
• Interfaces: how you hand over to and from other trades, and who on your side owns that.
• Quality and sign-off: inspection and test points, records, and how defects are closed out.
• People: the named supervisor or manager, and why they suit this job.

A simple programme or sequence diagram, where the format allows one, often explains more than a page of text.

Social value: commit to what you can deliver

Social value is scored in most public work and often flows down to subcontractors from the tier 1's own bid. Under PPN 002, central government departments, executive agencies and non-departmental public bodies must apply a minimum 10% weighting of the total score to social value.⁴ The note applies to above-threshold procurements under the Act, not below-threshold ones.⁴ Councils and other buyers may use their own approach, so check the documents.

Two points in the guidance matter for how you write. First, the assessment is qualitative: buyers score how the method statement and implementation plan meet the criteria, and volumes are not evaluated.⁵ Promising forty apprentices scores no better than promising four if the plan behind it is thinner. Second, the social value commitments a supplier makes during the procurement must be reflected in the contract as terms or performance indicators.⁴ Whatever you promise, you will be measured on.

For a small subcontractor, a credible answer usually rests on things you already do: local labour, an apprentice or two, work experience with a local college, using local suppliers, and how you will record and report them. Name the people who will do it and how often you will report.

Word limits, formatting and the final check

Word limits are part of the test. Answers that run over may be cut off or marked down, depending on the instructions, so treat every limit as fixed and read whether it includes headings and tables.

• Short paragraphs with a subheading for each part of the question.
• Bullet points for lists of actions, full sentences for reasoning.
• Tables for responsibilities, key dates and resources where the portal allows them.
• No attachments the buyer did not ask for: evaluators are often told not to read them.
• Consistent names, figures and dates across every answer and the priced schedule.

Before you submit, have someone who did not write the answers score them against the published scoring guide. It is the quickest way to find the parts of a question you have not answered.

Build an answer library once

Most subcontractor tenders ask versions of the same core questions: health and safety management, quality, environmental management, programme, resourcing, supply chain, social value, carbon, and relevant experience. Writing them from scratch every time is the main reason small firms say they have no time to bid.

An answer library is a set of approved, current answers and evidence: company facts, policies, accreditations and expiry dates, the case studies, CVs of key people and your best-scoring past answers, each tagged by topic and with the date it was last checked. For public work, Find a Tender, the central digital platform, stores your core business details so you can use them for multiple bids,¹ which covers the basic company information. The library covers everything else.

Treat library answers as a starting point. Each one still needs rewriting for the specific question, site and scoring guide. Pasting a stock answer in whole is how firms end up answering the wrong question.

Deciding whether to bid

Every bid takes estimators, managers and directors away from running jobs. A quick, honest bid/no-bid review before you start protects that time for the opportunities you are most likely to win. Use the checklist below; if you cannot tick most of it, think hard before committing.

Using AI tools to draft, with people checking

AI tools are now part of how many firms prepare bids, and public buyers know it. The Cabinet Office's PPN 017 says there are potential benefits to suppliers using AI to develop bids, and that suppliers' use of AI is not prohibited during the commercial process.⁶ The same note suggests buyers may ask suppliers to disclose their use of AI in creating a tender, and may carry out extra due diligence to check a supplier can actually deliver what its tender says.⁶

Used well, AI is good at the first draft and the tedious parts: breaking a question into its parts, checking an answer against the scoring guide, tightening an answer to a word limit, and finding the right case study in your library. It is poor at knowing what happened on your sites. It will invent plausible projects, figures and accreditations if you let it.

• Give it your own approved answers and evidence to work from, not the open internet.
• Have a person who knows the job check every fact, name, date and figure.
• Do not paste confidential tender documents into tools that may use them for training.
• Answer honestly if the buyer asks whether AI was used.

An assistant that searches your own answer library and past submissions, and drafts from those, is a practical step up from a general chatbot. It is the kind of internal tool we build as an AI agent. For more on where AI is genuinely useful in construction, see what UK contractors use AI for.

In-house or a bid writer?

There is no single right answer. It depends on how many tenders you submit, how technical they are and whether anyone in the business has the time and the writing ability.

Whichever route you choose, the technical content still has to come from your own people. A bid writer can structure and sharpen an answer, but cannot invent the method, the programme or the evidence. Firms that hand over a tender with no input from the site team tend to get generic answers back.

Learn from every result

Under the Procurement Act, when a public contract is awarded after a competitive tendering procedure, the contracting authority must give each supplier that submitted an assessed tender an assessment summary explaining why its tender was or was not successful.⁷ For an unsuccessful bidder, the summary also includes relevant information about the winning tender.⁷ A standstill period of at least eight working days then begins on the day the contract award notice is published, before the contract can be signed.⁸

Read the summary question by question. Where you lost marks, note what the winning answer had that yours did not, and update the library answer the same week. Tier 1s are not bound by the Act, but most supply chain managers will give feedback on a lost package if you ask politely and promptly.

Track a few numbers over a year: tenders submitted, win rate by client and package type, and average quality score by question topic. Those numbers show where to improve and which buyers are worth bidding for. And make sure the projects you win end up as case studies, on your site and in the library. Our marketing team works with construction firms on that evidence base, and the marketing score calculator is a quick way to see where yours stands.