AI Consultant vs AI Agency: Which Fits an SME?
AI consultant vs AI agency is the comparison every SME owner runs at the point they decide to spend money on AI. Both cost £2,000 to £12,000 per month. Both claim to deliver AI-driven growth. The difference is structural and it matters more than the price. An AI consultant is an operator who builds AI systems inside your existing tools, measured in shipped workflows. An AI agency is a service layer with an account manager, a sales commission, an overhead pool, and roughly 10 percent of the retainer left for actual work. For a business between £500,000 and £5 million in revenue, the choice usually comes down to whether the problem is "we need to run paid acquisition campaigns" (agency fit) or "we need AI to absorb repetitive workflows" (consultant fit). 8 of our 12 clients at twohundred.ai moved their qualified-inquiry number 4x in 60 days with a consultant engagement, after wasting an average of £18,000 on an agency engagement that did not fit.
What does an AI consultant actually do?
An AI consultant builds. A fractional operator like us sits inside your CRM, WhatsApp, Gmail, and booking tools and configures or codes the AI systems that absorb the work your team is drowning in. A Dubai stem cell clinic with 14 staff went from 4 direct bookings per month to 17 in 60 days after we shipped a WhatsApp qualifier. A Manchester recruitment firm with 9 consultants recovered £160,000 in stalled placements inside 90 days with a Salesforce sync layer. The deliverable is a working system the team uses on Monday morning, not a strategy deck. For the full scope, see our AI strategy consultant pillar.
What does an AI agency actually do?
An AI agency runs campaigns. Their natural shape is a team of 5 to 50 people with defined functions: account manager, strategist, copywriter, media buyer, analyst. They are structurally oriented toward things that repeat (monthly reporting, weekly optimisation, campaign management), which makes them strong at paid acquisition and weak at one-off system builds. A typical AI agency retainer is £4,000 to £12,000 per month with 40 percent overhead, 30 percent sales commission, 20 percent account manager, and about 10 percent on the actual work. That is a real Reddit quote from a small business owner describing a £6,000 monthly retainer.
The structural difference in one table
| Dimension | AI consultant | AI agency |
|---|---|---|
| Team size | 1 to 3 operators | 5 to 50 staff |
| Typical cost | £2,000 to £5,000 per month | £4,000 to £12,000 per month |
| What you buy | Shipped AI systems | Campaign management |
| Who does the work | The senior person | Junior staff, managed by senior |
| Primary output | Working workflows | Reports, dashboards, ad campaigns |
| Time to first result | 14 to 21 days | 60 to 90 days |
| Best problem | Workflow bleeding hours or money | Recurring paid acquisition |
| What happens after launch | System keeps working | Ongoing management required |
The six-figure question is the last row. A working system we ship keeps working after the engagement ends. A paid acquisition campaign an agency runs needs ongoing management, which is why the retainer never ends.
When does an AI agency fit?
An AI agency is right when three conditions hold. First, you have a paid acquisition budget of £5,000 per month or more that needs ongoing management. Second, your problem is "we need more qualified traffic" rather than "our existing traffic is leaking at the response stage." Third, you want the ongoing commitment of weekly reporting and monthly optimisation. If all three hold, an agency is a sensible hire.
When does an AI consultant fit?
An AI consultant fits when the problem is operational, not promotional. Read the signs you need an AI consultant for the specific symptoms. The 3 most common: your response time on inbound enquiries is above 6 hours, your team is paying for 20 or more SaaS subscriptions that do not talk to each other, and your founder is the single source of truth for customer information. Each of those has a specific AI system that fixes it, and the fix takes 14 to 21 days to ship.
Can you hire both?
Yes, and some of our clients do. The sequencing matters. We usually advise the AI consultant first, because fixing the operational bleed turns every extra £1,000 of agency-driven traffic into more revenue. Running an agency before the operational layer is sealed is like adding water to a leaky bucket.
For the adjacent comparisons, see our posts on AI consultant vs fractional CTO and AI consultant vs in-house AI team.
Frequently asked questions
Can an AI agency build systems the way a consultant does?
Occasionally, yes, but the economics are wrong. A senior agency builder making £600 per day inside a firm with 40 percent overhead costs the agency £840 per day to put on your project, which means they can only justify the assignment on a day rate of £1,200 or more. A fractional consultant with no overhead can charge £500 per day and still take the work home. That price delta is why most agencies do not ship systems and most consultants do not run campaigns.
Is an AI consultant just a freelancer?
No. A freelancer takes scoped project work and hands it over. An AI consultant holds a rolling retainer, embeds inside the team, and keeps shipping systems across multiple quarters. The relationship shape is closer to a fractional executive than a freelance project.
How much does an AI consultant cost compared to an AI agency?
A fractional AI consultant at twohundred.ai is £2,000 to £5,000 per month. A typical AI agency retainer for a comparable-scope engagement is £4,000 to £12,000 per month. The price delta is the overhead the agency carries. For the full pricing breakdown, see our how much does an AI consultant cost guide.
What if I am not sure what I need?
Book a 30-minute call. We will tell you honestly if what you need is a consultant, an agency, a fractional CTO, or none of the above. Seven of the last 12 initial calls we took ended with us recommending something other than our own service, because the problem did not fit.
Want this built for your business? Book a call.