How Much Does a Fractional CTO Cost
in the UK?
A transparent guide to fractional CTO pricing, day rates, and engagement models — so you can budget with confidence before your first conversation.
Fractional CTO Day Rates in the UK
The cost of a fractional CTO in the UK typically ranges from £1,000 to £2,500+ per day, depending on seniority, scope, and industry complexity. This compares favourably to a full-time CTO salary of £150,000–£250,000+ per year (before equity, benefits, NI, and recruitment fees). For most startups and SMEs, a fractional CTO engagement costs between £3,000 and £10,000 per month — a fraction of the full-time equivalent.
Fractional CTO vs Full-Time CTO Cost
Full-Time CTO
- • £150k–£250k+ base salary
- • 0.5%–3% equity stake
- • Employer NI, pension, benefits
- • £20k–£50k recruitment cost
- • 3–6 month hiring timeline
- • Total year-one cost: £200k–£350k+
Fractional CTO
- • £1,000–£2,500 per day
- • No equity required
- • No employer NI or benefits
- • No recruitment fees
- • Start within days, not months
- • Typical annual cost: £36k–£120k
What Affects the Price?
Scope & Time Commitment
A one-day-per-week advisory engagement costs less than an intensive three-day-per-week hands-on role. Most engagements start at 1–2 days per week and scale up or down as the business needs evolve.
Industry & Complexity
Regulated industries like fintech or healthtech command higher rates due to compliance requirements (FCA, PSD2, GDPR). Deep domain expertise in sectors like financial services, biotech, or defence justifies premium pricing.
Engagement Type
A startup technical due diligence project is typically a fixed-fee engagement (£5k–£25k). Ongoing fractional CTO advisory is usually billed monthly on a retainer. Project-based work like cloud migration or legacy modernisation may be scoped separately.
Fractional CTO Equity vs Salary
Some fractional CTOs offer blended models — a lower day rate in exchange for a small equity stake. This can work well for early-stage startups with limited cash but strong growth potential. However, most established fractional CTO arrangements are purely fee-based, keeping the relationship clean and aligned around deliverables.
Common Engagement Models
- ✔ Advisory retainer — 1 day/week, strategic guidance, board attendance, tech roadmap reviews
- ✔ Hands-on leadership — 2–3 days/week, managing engineering teams, hiring, architecture decisions
- ✔ Project-based — fixed scope (e.g., due diligence, platform audit, migration planning)
- ✔ Interim CTO — full-time bridge while you recruit a permanent CTO (typically 3–6 months)
- ✔ Crisis / rescue — intensive engagement to rescue a failing software project or stabilise after a CTO departure
Signs You Need a Fractional CTO
Your CTO just left and you need an interim CTO to bridge the gap while you hire
You are a non-technical founder and need a technical co-founder replacement
Investors want a startup tech stack audit before they commit to funding
Your engineering team is growing but delivery velocity is not
A software project is failing and you need someone to rescue it
You need to scale your platform but the current architecture will not support it
Get a Tailored Quote
Every business is different. Book a free consultation and we will scope the right engagement model and pricing for your situation.