Choosing between an in-house design team, an agency, or a fractional (embedded) partner comes down to how continuous and specialised your design work is. In-house wins for constant, long-term product work you want owned internally. An agency wins for defined projects, specialist skills and surge capacity. A fractional partner sits between the two — senior capacity by the month without a permanent hire — and suits scale-ups that need seniority and continuity but aren’t ready to build a full team.
Here’s the full comparison — cost, speed, seniority, risk and when each one wins — so you can match the model to your stage rather than default to whichever you’ve used before.
In-house vs agency vs fractional: the comparison table
| Factor | In-house team | Agency | Fractional / embedded |
|---|---|---|---|
| Typical cost | £70k–£110k+ salary each, plus ~30% overhead | £15k–£150k+ per project, or £5k–£25k/mo retainer | £4k–£20k/mo for senior capacity |
| Speed to start | Slow — 2–4 months to hire | Fast — days to weeks | Fast — days to weeks |
| Seniority | What you can hire and retain | Senior, but often junior delivery | Senior, hands-on |
| Product context | Deep — lives in the product | Shallower — project-based | Deep — embeds in your team |
| Flexibility | Low — fixed headcount | High — scale up/down | High — adjust by month |
| Best for | Constant, long-term, owned work | Defined projects & specialisms | Ongoing senior capacity without a hire |
In-house design team
An in-house team is designers on your payroll. The upside is context and ownership: they live in the product, absorb institutional knowledge, and are always available. The downside is cost and rigidity — salaries plus roughly 30% in overheads, two to four months to hire, and fixed capacity whether the workload is full or not. In-house is most cost-effective when product design is a constant, full-time load and you want it owned internally. The risk is under-utilisation and, without senior leadership, adding headcount without adding quality.
Design agency
An agency is an external team you engage per project or on a retainer. The upside is speed, range and senior capability without a hire — ideal for defined projects, specialist skills, or a redesign you want to de-risk. The downside is that context is shallower and, at larger agencies, a senior pitch team is often followed by junior delivery. Agencies are best when the work is a project rather than a permanent need. We break down the two-way trade-offs in detail in in-house design team vs agency.
Fractional / embedded design
A fractional (or embedded) partner is a senior designer or small team that works inside your company by the month — part-time or full-time — without being a permanent hire. You get the continuity and context of in-house (they join your standups, learn your product, own the work) with the flexibility and seniority of an agency. It’s the model most scale-ups reach for when they need senior design now but aren’t ready to commit to a full internal team, or when they want a senior layer to set up design operations before hiring juniors underneath it.
Which should you choose?
Match the model to the shape of the work, not the other way round:
- Choose in-house when design is a constant, full-time load and ownership matters more than flexibility.
- Choose an agency for a defined project, a specialist skill, or capacity you need for weeks, not years.
- Choose fractional/embedded when you need senior design continuously but can’t yet justify — or fill — a full-time senior hire.
- Run a hybrid — the most common setup at scale-ups: a small in-house team for day-to-day, plus an external partner for surge, specialism or senior direction.
How Biotik fits
Biotik works as the fractional/embedded option — and as a project partner. We add senior product-design capacity to your team by the month, or take a defined problem from research to buildable design on a fixed scope. For teams that will eventually hire in-house, we often set up the operations, system and process first, so the internal team starts on solid ground rather than inheriting chaos. Working across London, Tallinn and the wider EU. See our product design services or the full cost breakdown.
Frequently asked questions
In-house design team, agency or fractional — which is best?
It depends on how continuous and specialised the work is. An in-house team is best for constant, long-term product work you want owned internally. An agency is best for defined projects, specialist skills and surge capacity. A fractional (embedded) partner sits between the two — senior design capacity by the month without a permanent hire — and suits scale-ups that need seniority and continuity but aren’t ready to build a full team. Many companies run a hybrid.
Is an in-house designer or an agency cheaper?
For constant work, in-house is usually more cost-effective once you account for utilisation — a salaried designer (£70,000–£110,000 plus ~30% overheads) is cheaper per hour if kept fully busy. For variable or specialist work, an agency or fractional partner is cheaper because you only pay for what you use and skip recruitment, overheads and idle time. The real question isn’t the day rate — it’s how consistently you’d keep a full-timer busy.
What is fractional or embedded design?
Fractional (or embedded) design is a senior designer or small team that works inside your company by the month, part-time or full-time, without being a permanent hire. You get the continuity and context of in-house — they join your standups, learn your product, own the work — with the flexibility and seniority of an agency. It’s a common model for scale-ups that need senior design now but aren’t ready to commit to a full internal team.
When should a startup hire a design agency instead of an in-house designer?
When the work is a defined project rather than a continuous need, when you need senior capability faster than you can hire, when you need a specialist skill (research, design systems, branding) for a short stretch, or when you’re de-risking a build or redesign before committing. Hiring in-house makes more sense once product design is a constant, full-time load and you want it owned internally.
Can you use an agency and an in-house team together?
Yes — it’s the most common setup at scale-ups. A small in-house team owns day-to-day product design and institutional knowledge, while an agency or fractional partner adds surge capacity, specialist skills, or senior direction the internal team doesn’t yet have. Done well, the external partner also levels up the in-house team rather than competing with it.