How to win construction tenders in the UK: a practical guide for small and growing builders

What a construction tender is (and how it differs from a quote)

A quote is your price for a job a client asks you about. A tender is a formal competition: the client issues the same documents to several firms, everyone prices the same scope by a deadline, and the bids are scored against criteria that are written down before anyone submits.

There are two worlds. Public sector tenders (councils, schools, NHS trusts, housing associations, central government) follow procurement law and have to be advertised. Private tenders (developers, commercial landlords, main contractors buying subcontract packages, high-end residential clients working through a quantity surveyor or architect) are usually by invitation. Most growing builders win their first tenders in the private world, or as a subcontractor to a main contractor on public work.

Where to find construction tenders in the UK

Public sector

Since the Procurement Act 2023 came into force on 24 February 2025, public buyers in England, Wales and Northern Ireland follow one set of rules. Opportunities are published on the government's Find a Tender service. Buyers also have to publish notices for many smaller contracts: above £12,000 for central government and above £30,000 for councils, NHS trusts and universities. That matters for small firms, because lower-value work is easier to find than it used to be.

Also register on the procurement portals of the councils and housing associations in your area. Much local maintenance, refurbishment and minor works is let through these portals and through frameworks, where a buyer appoints a panel of contractors for several years and gives work to firms on the panel.

Private sector

• Main contractors' supply chains. Most main contractors keep an approved list of subcontractors and send packages to firms on it. Getting on the list is the tender.
• Quantity surveyors and architects. On private projects they usually choose who is invited to price. A short, professional introduction with photos of finished projects in their sector gets you onto their list.
• Developers and commercial landlords. Fit-outs, refurbishments and planned works are tendered to a small list of known firms. Relationships and a track record matter more than adverts.

Get tender-ready before you bid

Most small builders lose tenders before price is even looked at, because the pre-qualification stage asks for documents they don't have. Build this pack once, keep it in one folder and update it every quarter:

1. Company basics. Company registration, VAT and CIS status, last two years of accounts, bank reference if asked.
2. Insurance. Public liability, employer's liability (a legal requirement if you employ people) and, where design is involved, professional indemnity. Check the levels buyers ask for in the tenders you want.
3. Health and safety. A written policy, risk assessment and method statement (RAMS) templates, training records and your accident record.
4. Pre-qualification certificate. The industry's Common Assessment Standard, issued by Build UK and CECA in April 2021 and built on PAS 91, is delivered by CHAS, Constructionline and Achilles. One assessment can satisfy many buyers instead of filling in a different questionnaire for each.
5. Quality and environment. A short quality procedure and environmental policy. Larger buyers may ask for ISO 9001 or ISO 14001; you don't need them for your first bids.
6. Case studies. Three to five projects with photos, value, duration, client and a reference who will pick up the phone. Group them by sector, because buyers want proof you have done their kind of job.

Bid or no-bid: 7 questions before you spend a week on it

A tender can take days of estimating and writing. Winning one in three is a good rate, so choosing which ones to chase is the biggest lever you have. Before you open the drawings, answer these:

1. Have we done this type of job at this size? If not, the quality score will be weak however good your price is.
2. Is the value right for our turnover? Buyers check that one contract won't be most of your yearly turnover.
3. Can we meet the programme with our current team and subcontractors?
4. Who else is bidding and how many firms are on the list?
5. Are the payment terms and retention survivable for our cash flow?
6. Is the scope clear, or will we be pricing risk we can't see?
7. Do we know anyone at the client or the QS? Cold tenders with no relationship are the hardest to win.

The same questions work for any lead. We cover them in detail in how to qualify construction leads.

Pricing a tender without giving away your margin

Under the Procurement Act, public buyers award contracts to the most advantageous tender, which means quality and price are both scored. Private clients work the same way in practice: the cheapest bid often isn't the one appointed, and the one that is appointed at a loss is the job that sinks a small firm.

• Build the price from the bottom up: labour, materials, plant, subcontractors, preliminaries (site set-up, supervision, welfare, skips, access), overheads and only then your margin.
• Price the risk you can see. Write down every assumption and exclusion, and put them in your submission.
• Get real subcontractor and supplier quotes for the big items rather than using old rates.
• Check cash flow, not just profit. Monthly valuations, 30-day payment and retention change how much money you need to carry the job. The Procurement Act requires 30-day payment terms to flow down public supply chains, which helps subcontractors.

Our step-by-step method, with worked £ examples, is in how to price building work in the UK.

Writing the quality answers

The quality section is where small firms can beat bigger ones, because big firms often send generic copy-and-paste answers.

• Answer the question that was asked, in the order it was asked, within the word limit. Use the buyer's own headings.
• Read the scoring guide and make sure each point that earns marks is visibly covered.
• Be specific to this project: who will run it, how you will phase it around the occupants, how you will protect the building, how you will handle deliveries and noise.
• Prove it with evidence: a similar project, a photo, a reference, a programme.
• Social value is scored on many public contracts. Local labour, apprentices and local suppliers are real answers for a small builder.

After you submit

Be quick and precise with clarification questions. If you are invited to interview, bring the person who will actually run the job. Win or lose, ask for feedback: on larger public contracts run under the Procurement Act, buyers must give each bidder an assessment summary explaining how their tender was scored. Private clients will usually tell you where you landed if you ask politely. That feedback is the cheapest way to improve your next bid.

One of the builders we mentor, Marek, together with his business partner Piter, won a £450K tender in South Kensington. The pattern is the same as above: the right size of job, a proper price and a submission that answered what the client cared about. Results vary and are not typical; you can see more examples on our results page.

Common mistakes that lose tenders

• Bidding on everything instead of the few jobs you can really win.
• Missing documents at pre-qualification, or out-of-date insurance certificates.
• Pricing low to win, then trying to make the money back on variations.
• Generic answers that don't mention the client, the building or the programme.
• Late submissions. Portals close at the minute stated, and a late bid is not opened.
• Never asking why you lost.

If you are moving from domestic jobs to commercial work, read how to move from residential to commercial construction and how to win bigger construction projects. To turn more of your enquiries into signed contracts, see the construction sales process.

Read next: CHAS vs Constructionline vs SafeContractor and How much does bid writing cost in the UK?.

Frequently asked questions

BizMentor provides business education and mentoring for construction and trade business owners. Client results are individual results and are not typical. We do not promise or guarantee any specific income, profit, turnover or project size. Nothing here is financial, legal or tax advice. Check current procurement rules and thresholds with the buyer or on GOV.UK before you bid.