Partner map
How to find a prime contractor to partner with on UK public sector construction work
Eight UK construction primes, where their public work comes from, and how an SME finds one to partner with, free, starting from published award notices.
Skim · Built on Skim's live UK procurement database1 October 20268 min read
Skim award records for UK buyers, CPV division 45 (construction work), awards dated 2023 to 2025 — three complete years. Snapshot 1 October 2026. Each prime's figures come from its own Skim supplier record, which counts only awards whose supplier carries a national company identifier, so every count is a floor; where a record is truncated, buyer shares are stated as at least. Some awards are published twice under two notice references and appear twice in a record, so counts are award records rather than unique contracts. Contract values are as published on one named award. No market or supplier total is quoted, because published totals include framework ceilings shared by every supplier appointed to them.
The short answer
97%
Skim award records, snapshot 1 October 2026
To find a prime contractor to partner with on UK public sector work, start from award notices rather than directories. Every award notice names the main contractor that won the job, so the primes holding live work in your trade and region are one search away on Contracts Finder and Find a Tender. Then look at where each prime's work comes from, because that decides which of its projects can use you. In UK public construction from 2023 to 2025, at least four of the eight main contractors in this map drew most of their recorded awards from one buyer: the Department for Education, for school and college buildings.
For those primes, school building is the largest single source of public work on record, and the route into it runs through them. The department awards the main works; the prime then lets the trade packages inside each project to its own supply chain.
How to find a prime contractor yourself, free
The map below can be rebuilt from public notices at no cost, in an afternoon for one region.
| Step | Where | What it gives you |
|---|---|---|
| 1. Find who wins main contracts | Contracts Finder for below-threshold awards, Find a Tender for above, filtered to construction work (CPV 45) and your region | The main contractor named on each award |
| 2. Group the awards | The CSV export on either service, grouped by contractor and then by buyer | Which primes are active near you, and which buyers they work for |
| 3. Read the live projects | Each award notice: value, contract period, site | Projects still under contract, where trade packages are being let |
| 4. Get on the prime's supply chain | The prime's own supplier registration, which usually asks for a pre-qualification scheme such as Constructionline or an SSIP health and safety accreditation | A place on the list the prime's buyers call |
Contracts Finder also carries some subcontract opportunities that primes choose to publish there, but most supply-chain packages are never advertised publicly. Step three is what turns a list of names into a conversation: a named project with a contract period gives a prime's supply-chain team a reason to take the call.
The partner map
Eight of the largest UK building contractors in Skim's construction ranking for 2023 to 2025, chosen because each delivers whole projects as main contractor and so lets work to subcontractors. For each: the award records in its own Skim record, and how many came from the Department for Education, with the department's two published spellings merged. Where a record is truncated, the share is a floor.
| Prime contractor | Award records, 2023 to 2025 | From the Department for Education | Share |
|---|---|---|---|
| Bowmer & Kirkland | 68 | 66 | 97% |
| Tilbury Douglas Construction | 52 | 42 | 81% |
| BAM Construction | 34 | 27 | 79% |
| Kier Construction | 52 | at least 37 | at least 71% |
| Wates Construction | 26 | 12 | 46% |
| Galliford Try | 46 | at least 19 | at least 41% |
| Morgan Sindall Construction & Infrastructure | 50 | at least 15 | at least 30% |
| Willmott Dixon Construction | 30 | at least 5 | at least 17% |
On this record, four of the eight are mainly school builders in their public work: Bowmer & Kirkland, Tilbury Douglas, BAM and Kier. Tilbury Douglas's school work has grown in each of the three years, from 4 Department for Education awards in 2023 to 12 in 2024 and 26 in 2025. Morgan Sindall and Willmott Dixon are spread far wider. Morgan Sindall's record runs across the Ministry of Justice, police and fire authorities, a university and two electricity transmission owners; Willmott Dixon's across at least 13 buyers, including NHS Property Services, the Government Property Agency, National Highways and several councils. Wates sits between the two, with 12 awards from the department and 8 from the Ministry of Justice.
Named projects to open a conversation with
A named project gives a prime's supply-chain team something specific to answer. These are main-works contracts awarded by the Department for Education, one per prime where its record names one, each still under contract. Values are as published on the award.
| Prime contractor | Project | Contract value | Contract ends |
|---|---|---|---|
| Bowmer & Kirkland | Northumberland College | £50,768,637 | 2 December 2027 |
| Kier Construction | The Hewett Academy, main works | £40,867,710 | 4 November 2027 |
| Morgan Sindall | Star Leadership Academy, main works | £39,110,129 | 3 March 2028 |
| BAM Construction | The Salesian Academy of St John Bosco, main works | £30,952,427 | 19 July 2027 |
| Willmott Dixon | Durham Academy, main works | £20,699,939 | 23 August 2027 |
| Galliford Try | Hill West Primary School, main works | £17,117,262 | 26 April 2027 |
| Tilbury Douglas | Faringdon SEN school, main works | £16,012,276 | 24 December 2027 |
A contract value is what the department pays the prime for the whole project, not the value of any package within it. The packages, and who wins them, are not published.
What this means for an SME subcontractor
If your trade fits school and college buildings, four of the eight primes here are, on this record, mostly building for that programme, and their pipelines follow the department's. Registering with two or three of them covers more of the programme's projects than registering with one. The department does award some minor and temporary works itself, and those appear on Contracts Finder, but the main works and the trade packages inside them go through the primes.
If your work is wider, such as justice estate, health buildings or council projects, a prime with a spread record, such as Morgan Sindall or Willmott Dixon, offers more kinds of project but fewer of any one kind. Either way, the concentration cuts both ways: a supply chain built on one buyer's programme moves with that programme's budget.
What this data cannot tell you
Every count is a floor. A supplier record counts only awards whose supplier carries a company identifier, and many published awards do not.
Counts are award records, not unique contracts. Some awards are published twice under two notice references and appear twice in the winner's record: one school contract checked for this report does, and 3 of the Department for Education's 74 construction award notices published in 2025 are duplicate pairs. Different Skim queries over the same awards also return different counts for the same companies. Read the counts as approximate and the shares as the steadier figure.
The map covers public construction only. Every one of these primes also has private work that no public record shows, so a 97% share describes a public book, not a whole business.
It shows where primes win, not whom they buy from. Subcontract awards are almost never published, so the data cannot say which SMEs are already in a prime's supply chain.
FAQ
How do I find a prime contractor to partner with on UK public sector work?
Search awarded notices on Contracts Finder and Find a Tender for your sector and region; each notice names the main contractor. Group the awards by contractor and by buyer to see which primes hold live work near you and what kind, then register on the supplier portals of the two or three whose projects fit your trade, quoting a named live project when you make contact.
Which tools help SMEs find subcontracting opportunities on government contracts?
The free starting points are Contracts Finder, which carries award notices and some subcontract opportunities that primes publish, and Find a Tender for larger awards. Primes' own supplier portals are where most packages are actually let. Award-data platforms, Skim among them, group the notices by contractor and buyer for you, which saves the afternoon of exporting but adds no record the notices do not hold.
Which construction contractors win the most Department for Education work?
Among the eight primes in this map, Bowmer & Kirkland has the most Department for Education award records from 2023 to 2025, at 66, followed by Tilbury Douglas with 42 and Kier with at least 37. All three counts are floors, and contractors outside this map were not compared.
Why map primes by where their work comes from rather than by contract value?
Because a subcontractor needs to know which projects a prime can use them on, and the buyer mix answers that. Published value totals are also unreliable at supplier level: framework agreements publish a ceiling shared by every supplier on them, and the same multi-billion pound figure can appear on several primes' records at once.
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