Winning public sector contracts often feels like a numbers game — large primes with established frameworks, extensive compliance documentation, and years of relationship capital. For smaller design and digital agencies, this can feel like a wall.
But there's a route that many agencies overlook: subcontracting.
Rather than bidding for contracts head-on, you work with a prime contractor — a larger consultancy or delivery partner who holds the framework position or has won the main contract — and deliver a defined workstream within it. Done well, subcontracting gives you access to government work you'd never reach alone, while the prime handles most of the procurement complexity.
This guide explains how it works, where to find opportunities, and how to make yourself an attractive subcontracting partner.
What Is Public Sector Subcontracting?
When a government buyer awards a contract to a large prime contractor, that prime often doesn't deliver everything in-house. They bring in specialist subcontractors to cover specific areas of work: user research, service design, accessibility, front-end development, content design, brand, or digital strategy.
From the buyer's perspective, the contract is with the prime. From your perspective, the contract is with the prime — but the work, the rate, and the relationship are real.
Subcontracting arrangements are common across:
- Digital transformation programmes — a systems integrator brings in a UX agency for the design workstream
- Framework call-offs — a large consultancy holds a DOS or G-Cloud framework position and sub-contracts the design delivery
- Policy and comms work — a PR or research firm subs out brand identity and content design to a specialist agency
- NHS and local government projects — large transformation programmes routinely involve specialist subcontractors
Why This Route Works for Smaller Agencies
Direct procurement requires you to pass financial standing checks, demonstrate significant company turnover (often 2× the contract value), provide three years of accounts, and supply references from comparable past contracts. For agencies under 20 staff, this eliminates you from many opportunities before you've written a word of the bid.
As a subcontractor, most of this falls to the prime. They've already cleared procurement due diligence. You're contracting with them, not the buyer. Your requirements are simpler: proof of insurance, a signed NDA, and a clear scope of work.
The trade-off is margin — primes take a cut for managing the risk and relationship — but the access more than compensates, especially in early-stage public sector growth.
Where to Find Subcontracting Opportunities
1. Notices on Find a Tender and Contracts Finder
When large contracts are advertised on Find a Tender or Contracts Finder, look beyond whether you can bid directly. Ask: who's likely to win this? Could they use a specialist design or digital partner?
Contracts with values above £1m from large digital transformation primes (Kainos, Capgemini, Made Tech, TPX Impact, Sopra Steria) are often pipeline for subcontracting relationships. Monitoring these notices keeps you aware of what's in market — even when you're not bidding.
This is where Tandara helps. Rather than manually scanning portals daily, you get relevant opportunities delivered to your inbox. Even notices you wouldn't bid on directly signal which primes are active in your space — and when to reach out.
2. G-Cloud and DOS Supplier Lists
Get on G-Cloud (for cloud/software services) or the Digital Outcomes and Specialists (DOS7) framework yourself. Even if you don't win call-offs directly, being on a framework makes you a more credible subcontracting partner. Primes can verify your credentials quickly, and buyers sometimes request specific subcontractors by name.
Being on a framework signals procurement readiness. It's a lightweight credential that opens doors.
3. Target the Established Primes Directly
The most direct route is proactive outreach to the digital delivery primes who regularly win government work. Some worth knowing:
- Made Tech — GDS-aligned delivery, NHS and central government work
- Torchbox — non-profit and public sector digital, strong in charity/NHS
- TPX Impact — local government and public sector transformation
- Kainos — large-scale digital transformation, DWP, HMRC
- dxw — central and local government, strong design culture
- Mando — public sector digital, NHS and councils
These organisations regularly need specialist design and UX capacity that they don't hold in-house. A short, direct email to their partnerships or delivery lead — explaining what you do, your public sector experience, and your typical project size — is the starting point.
Don't cold-pitch a rate card. Cold-pitch a capability.
4. Look for Prior Suppliers on Completed Contracts
Both Find a Tender and Contracts Finder publish contract award notices. Search for completed contracts in your area and find who won — then research their delivery approach. Did they deliver in-house or with partners? A quick LinkedIn search often reveals their team composition and whether they work with subcontractors.
5. Agency Networks and Communities
Communities like Agency Hackers, DBA, and the Agency Collective include many digital delivery agencies, some of whom hold framework positions. Building genuine peer relationships — sharing knowledge, attending events, being visible — surfaces partnership opportunities that would never appear on a procurement portal.
How to Position Yourself as an Attractive Subcontractor
Primes evaluate subcontractors quickly. They need to know you can deliver, won't create risk, and won't complicate the client relationship. Here's what makes the difference:
Clarity on scope
Know exactly what you do and what you don't. "We do end-to-end digital design" is less useful than "We specialise in user research, service design, and prototype development for transactional government services." The more specific your scope, the easier it is for a prime to slot you into a delivery model.
Public sector references
Even one completed public sector project — no matter how small — is worth explicitly referencing. It signals you understand the operating environment: accessibility standards (WCAG 2.2), GDS service standard, stakeholder management in political environments, procurement paperwork.
If you don't have direct public sector experience yet, references from adjacent regulated sectors (NHS, housing associations, charities) carry weight.
Insurance and compliance readiness
Primes need to move fast when a contract starts. Have your professional indemnity and public liability insurance documented and current. Know your IR35 position if you work with freelancers. Have an NDA template ready.
Small friction points — a two-week wait on an insurance certificate — can cost you a subcontracting slot.
Rate transparency (internally)
Primes typically take 15–25% of what the buyer pays for managing the contract. If the buyer rate for UX design is £900/day, expect to receive £675–765/day as a sub. Know your floor rates internally before any conversation starts, so you can move quickly when asked.
How to Build a Subcontracting Pipeline (Not Just Chase One-Offs)
The goal isn't a single subcontracting job — it's a position as a trusted specialist partner for one or two primes who repeatedly bring you in.
To build this:
Be visible before you're needed. Publish case studies. Write content that demonstrates sector knowledge. When a prime searches for a design specialist, your name should appear.
Stay in contact between projects. A quarterly email — "we have capacity, here's what we've been working on" — keeps you front of mind without being intrusive.
Treat the prime like a client. Their success on the project is your success. Reporting, responsiveness, and clear handoffs matter as much as the design output.
Build relationships at the delivery level, not just the business development level. The people who recommend subcontractors are usually project managers and delivery leads, not partners. Invest in those relationships.
The Monitoring Advantage
One underappreciated element of building a subcontracting pipeline is knowing what's in market before you call. If you contact a prime asking about opportunities without knowing what they've recently won or bid on, the conversation is vague. If you contact them three days after a major contract award — having spotted the notice on Find a Tender — the conversation has context.
"Congratulations on the NHS Digital award — if you need specialist design capacity on the delivery team, I'd like to talk" is a far stronger opening than a cold capability pitch.
Monitoring procurement portals consistently is what makes this possible. Tandara does that automatically — filtering the noise and delivering the relevant notices so you can act on signal, not search.
14-day free trial at tandara.co.uk — no card required. Know which primes are active in your space before you make the call.
Winning public sector contracts often feels like a numbers game — large primes with established frameworks, extensive compliance documentation, and years of relationship capital. For smaller design and digital agencies, this can feel like a wall.
But there's a route that many agencies overlook: subcontracting.
Rather than bidding for contracts head-on, you work with a prime contractor — a larger consultancy or delivery partner who holds the framework position or has won the main contract — and deliver a defined workstream within it. Done well, subcontracting gives you access to government work you'd never reach alone, while the prime handles most of the procurement complexity.
This guide explains how it works, where to find opportunities, and how to make yourself an attractive subcontracting partner.
What Is Public Sector Subcontracting?
When a government buyer awards a contract to a large prime contractor, that prime often doesn't deliver everything in-house. They bring in specialist subcontractors to cover specific areas of work: user research, service design, accessibility, front-end development, content design, brand, or digital strategy.
From the buyer's perspective, the contract is with the prime. From your perspective, the contract is with the prime — but the work, the rate, and the relationship are real.
Subcontracting arrangements are common across:
- Digital transformation programmes — a systems integrator brings in a UX agency for the design workstream
- Framework call-offs — a large consultancy holds a DOS or G-Cloud framework position and sub-contracts the design delivery
- Policy and comms work — a PR or research firm subs out brand identity and content design to a specialist agency
- NHS and local government projects — large transformation programmes routinely involve specialist subcontractors
Why This Route Works for Smaller Agencies
Direct procurement requires you to pass financial standing checks, demonstrate significant company turnover (often 2× the contract value), provide three years of accounts, and supply references from comparable past contracts. For agencies under 20 staff, this eliminates you from many opportunities before you've written a word of the bid.
As a subcontractor, most of this falls to the prime. They've already cleared procurement due diligence. You're contracting with them, not the buyer. Your requirements are simpler: proof of insurance, a signed NDA, and a clear scope of work.
The trade-off is margin — primes take a cut for managing the risk and relationship — but the access more than compensates, especially in early-stage public sector growth.
Where to Find Subcontracting Opportunities
1. Notices on Find a Tender and Contracts Finder
When large contracts are advertised on Find a Tender or Contracts Finder, look beyond whether you can bid directly. Ask: who's likely to win this? Could they use a specialist design or digital partner?
Contracts with values above £1m from large digital transformation primes (Kainos, Capgemini, Made Tech, TPX Impact, Sopra Steria) are often pipeline for subcontracting relationships. Monitoring these notices keeps you aware of what's in market — even when you're not bidding.
This is where Tandara helps. Rather than manually scanning portals daily, you get relevant opportunities delivered to your inbox. Even notices you wouldn't bid on directly signal which primes are active in your space — and when to reach out.
2. G-Cloud and DOS Supplier Lists
Get on G-Cloud (for cloud/software services) or the Digital Outcomes and Specialists (DOS7) framework yourself. Even if you don't win call-offs directly, being on a framework makes you a more credible subcontracting partner. Primes can verify your credentials quickly, and buyers sometimes request specific subcontractors by name.
Being on a framework signals procurement readiness. It's a lightweight credential that opens doors.
3. Target the Established Primes Directly
The most direct route is proactive outreach to the digital delivery primes who regularly win government work. Some worth knowing:
- Made Tech — GDS-aligned delivery, NHS and central government work
- Torchbox — non-profit and public sector digital, strong in charity/NHS
- TPX Impact — local government and public sector transformation
- Kainos — large-scale digital transformation, DWP, HMRC
- dxw — central and local government, strong design culture
- Mando — public sector digital, NHS and councils
These organisations regularly need specialist design and UX capacity that they don't hold in-house. A short, direct email to their partnerships or delivery lead — explaining what you do, your public sector experience, and your typical project size — is the starting point.
Don't cold-pitch a rate card. Cold-pitch a capability.
4. Look for Prior Suppliers on Completed Contracts
Both Find a Tender and Contracts Finder publish contract award notices. Search for completed contracts in your area and find who won — then research their delivery approach. Did they deliver in-house or with partners? A quick LinkedIn search often reveals their team composition and whether they work with subcontractors.
5. Agency Networks and Communities
Communities like Agency Hackers, DBA, and the Agency Collective include many digital delivery agencies, some of whom hold framework positions. Building genuine peer relationships — sharing knowledge, attending events, being visible — surfaces partnership opportunities that would never appear on a procurement portal.
How to Position Yourself as an Attractive Subcontractor
Primes evaluate subcontractors quickly. They need to know you can deliver, won't create risk, and won't complicate the client relationship. Here's what makes the difference:
Clarity on scope
Know exactly what you do and what you don't. "We do end-to-end digital design" is less useful than "We specialise in user research, service design, and prototype development for transactional government services." The more specific your scope, the easier it is for a prime to slot you into a delivery model.
Public sector references
Even one completed public sector project — no matter how small — is worth explicitly referencing. It signals you understand the operating environment: accessibility standards (WCAG 2.2), GDS service standard, stakeholder management in political environments, procurement paperwork.
If you don't have direct public sector experience yet, references from adjacent regulated sectors (NHS, housing associations, charities) carry weight.
Insurance and compliance readiness
Primes need to move fast when a contract starts. Have your professional indemnity and public liability insurance documented and current. Know your IR35 position if you work with freelancers. Have an NDA template ready.
Small friction points — a two-week wait on an insurance certificate — can cost you a subcontracting slot.
Rate transparency (internally)
Primes typically take 15–25% of what the buyer pays for managing the contract. If the buyer rate for UX design is £900/day, expect to receive £675–765/day as a sub. Know your floor rates internally before any conversation starts, so you can move quickly when asked.
How to Build a Subcontracting Pipeline (Not Just Chase One-Offs)
The goal isn't a single subcontracting job — it's a position as a trusted specialist partner for one or two primes who repeatedly bring you in.
To build this:
Be visible before you're needed. Publish case studies. Write content that demonstrates sector knowledge. When a prime searches for a design specialist, your name should appear.
Stay in contact between projects. A quarterly email — "we have capacity, here's what we've been working on" — keeps you front of mind without being intrusive.
Treat the prime like a client. Their success on the project is your success. Reporting, responsiveness, and clear handoffs matter as much as the design output.
Build relationships at the delivery level, not just the business development level. The people who recommend subcontractors are usually project managers and delivery leads, not partners. Invest in those relationships.
The Monitoring Advantage
One underappreciated element of building a subcontracting pipeline is knowing what's in market before you call. If you contact a prime asking about opportunities without knowing what they've recently won or bid on, the conversation is vague. If you contact them three days after a major contract award — having spotted the notice on Find a Tender — the conversation has context.
"Congratulations on the NHS Digital award — if you need specialist design capacity on the delivery team, I'd like to talk" is a far stronger opening than a cold capability pitch.
Monitoring procurement portals consistently is what makes this possible. Tandara does that automatically — filtering the noise and delivering the relevant notices so you can act on signal, not search.
14-day free trial at tandara.co.uk — no card required. Know which primes are active in your space before you make the call.
Is Subcontracting Right for You?
Subcontracting works best if:
- You're earlier in your public sector journey and want to build experience without the full bid overhead
- You have a specialist capability (accessibility, user research, service design, content) that primes need but don't hold in-house
- You want to learn how government projects work from inside a delivery structure before going direct
- You have flexibility on rate and don't need to maximise margin on every project
It's less suited if you want to own the client relationship directly, have strong public sector credentials already, or your margins won't absorb the prime's cut.
Many agencies use subcontracting as an entry strategy — building their reference base and sector knowledge — then transition to direct procurement once they have the track record to clear the financial and compliance requirements.
A Practical Starting Point
This week:
- Identify three primes active in your area of public sector (use Contracts Finder to find recent award notices)
- Research their delivery model — do they work with subcontractors?
- Send a short, specific email to their delivery or partnerships lead
- Get on G-Cloud or DOS7 if you haven't already — it takes a few months but signals readiness
In parallel, set up monitoring so you know when contracts in your space are awarded, and to which primes. That's the intelligence layer that turns subcontracting from occasional to strategic.
Tandara monitors UK public procurement portals daily and filters for the opportunities most relevant to design and digital agencies — so you're never searching blind.
Tandara is a procurement monitoring service for UK design and digital agencies. Try it free for 14 days — no card required.