A design system agency that gets design and engineering using the same parts.
We're a design system agency. We turn scattered UI decisions into a governed system - components, tokens, and documentation that let design and engineering ship consistently, fast, without re-litigating the same button.
What's included
- Token architecture (color, type, spacing, motion)
- Component libraries in Figma, mirrored in code
- Usage documentation and contribution guidelines
- Rollout and adoption support for existing teams
What we don't do
- Building your product features
- Brand identity creation
- Maintenance after rollout, unless on a retainer
How we work
Audit
We inventory your existing UI to find duplicates, inconsistencies, and the patterns your team already relies on.
Foundations
We define tokens for color, type, spacing, and motion, the base everything else builds on.
Components
We design the component library in Figma and mirror it in code with your engineers.
Documentation
We write usage guidance and contribution rules so the system can grow without breaking.
Rollout
We help your teams adopt the system and migrate existing screens.
What it costs
Three ways to scope it, with a fixed price agreed before we start. Here is how each compares with what agencies typically quote.
Starter
Foundations and 30–50 components in Figma.
- Mellon
- £4,500 – £9,000
- Typical agency
- £5,000 – £10,000
- Typical timeline
- 3–5 weeks
Request thisWhat you get Mellon Typical agency Colour, type and spacing foundations Included Included 30–50 components Included Included Light and dark themes Included Extra cost Usage documentation Included Extra cost Accessibility checks Included Extra cost Developer handoff notes Included Included Growth
60–100 components with design tokens.
- Mellon
- £9,000 – £22,500
- Typical agency
- £10,000 – £25,000
- Typical timeline
- 6–10 weeks
Request thisWhat you get Mellon Typical agency Design tokens ready for code Included Extra cost 60–100 components with states Included Included Documentation site Included Extra cost Contribution guidelines Included Not included Onboarding for your team Included Extra cost 60 days of support Included Not included Enterprise
100+ components, a coded library and governance.
- Mellon
- £22,500 – £54,000
- Typical agency
- £25,000 – £60,000
- Typical timeline
- 3–6 months
Request thisWhat you get Mellon Typical agency Coded component library Included Extra cost Multi-brand theming Included Extra cost Governance and release process Included Extra cost Accessibility audit (WCAG 2.2 AA) Included Extra cost Versioned documentation site Included Extra cost Training for design and engineering Included Not included 90 days of support Included Not included
Prefer to pay by the hour or the month?
By the hour
Small jobs, fixes and work you cannot scope yet. Pay only for the hours used.
- Mellon
- £30 per hour
- Typical agency
- £75 – £150 per hour
- Senior designer, no juniors
- Billed in 30-minute steps
- Hours report every week
- Move to a fixed price if the scope settles
Monthly retainer
Best valueOngoing design work with hours reserved for you every month.
Quoted after a short call
- 40 hours reserved every month
- Weekly check-in call
- Priority turnaround on requests
- Unused hours roll over for one month
Prices are in GBP, before tax, and show the usual range for each scope. Agency figures are typical ranges from published 2026 pricing guides. Your quote depends on screens, pages and complexity.
Frequently asked questions
What is a design system?
A shared set of design tokens, components, and usage rules that design and engineering both build from, so products stay consistent as they grow.
When does a team need one?
When the same component keeps getting rebuilt in different ways, handoff creates rework, or new features drift from the rest of the product.
Do you build the components in code?
We design the library in Figma and mirror it in code with your engineers, so the two stay in step.
Can you work from our existing product?
Yes. We start from your current UI, keep the patterns that work, and consolidate the rest.
How do you help teams adopt it?
We provide usage documentation and contribution guidelines, and support the rollout across your teams.
How do you price design systems?
Clearly scoped work is a fixed project fee, and ongoing work is a monthly retainer. We scope it with you after a short call.