Demand Generation Consultant vs Agency: Which Should a Scaleup Hire?

You can burn £48,000 on demand generation without noticing. A six-month retainer at £8,000 a month and a plan nobody tested will do it. And honestly, the fee is the smaller problem. The bigger one is six months of campaigns that nobody diagnosed first.

I've helped a lot of founders through this exact decision, so I've got fairly strong views on it! Here's how I'd choose, what each option really costs in the UK, and when a hybrid beats both.

Should a scaleup hire a demand generation consultant or an agency?

In short: hire a consultant when you need a diagnosis or someone senior to steer. Hire an agency when the plan already exists and you need people to run it. And if you need both but can't justify a full-time team? That's where a hybrid comes in.

The way I think about it, you're paying a consultant for judgement. With an agency, you're mostly paying for hands and hours. Mix those up and you end up with strategy decks and no pipeline, or busy campaigns with nothing steering them. I've seen both more times than I'd like.

And honestly? You don't need to pick forever. You need to pick the right one for the next 90 days.

What mistakes do scaleups make when choosing?

The first one I see is hiring an agency to fix a strategy problem. Agencies execute what you give them, so if the brief is wrong, they'll execute the wrong thing very well (imagine that!).

The second is the mirror image, hiring a consultant to fix a capacity problem. You get a sharp plan and nobody to run it, and three months later you're back where you started.

Then there's hiring on logos. A famous client list tells you what an agency did for someone else. It tells you nothing about whether your stage, budget and sales cycle match theirs.

What does a demand generation consultant actually do?

A demand generation consultant works on the thinking. They audit your funnel, tighten your ideal customer profile (ICP) and pressure-test your positioning. Then they decide which channels deserve budget and how you'll measure them.

Some go further and embed as a fractional marketing lead, running weekly reviews, managing your team and reporting to the board. That's a different job from a one-off audit, and it's priced differently.

The big upside is honesty. A consultant who doesn't sell execution has no reason to push you toward a particular channel, and one senior person can shift your direction in a week.

The downside? Hands. A consultant is usually one person, so the plan only works if someone else can run it. I've seen a lot of excellent plans die in a shared drive because nobody owned delivery.

What does a demand generation agency actually do?

An agency gives you a team: specialists across paid media, content, search, account based marketing (ABM), creative and reporting. That's capacity a scaleup can't hire quickly.

For a benchmark, Gripped, a London agency for B2B SaaS companies, publishes its retainers at £5,000 to £15,000 a month. Most of its clients invest £8,000 to £12,000, with media spend billed separately. That's a useful marker for what a proper agency programme costs.

Where agencies shine is volume and speed once the plan exists. Where they struggle is bias. A paid search agency will usually recommend more paid search because, well, that's what it sells!

They can also be slow to change course. Many ask for minimum terms and build their teams around fixed channels, so if your data says switch, you're often renegotiating.

If you've already decided an agency is right, I wrote a guide on how to choose a B2B demand generation agency that covers the evaluation criteria and red flags (shameless plug, I know).

Consultant vs agency at a glance

The start times are typical estimates for freelancers and agencies, so treat them as guides rather than guarantees.

What does each option cost a UK scaleup?

Cost is where most comparisons go vague, so here are real published numbers, plus one worked example for a full time hire.

Full disclosure first: Growth Division sits between a consultant and an agency. We charge per person per month, so you only pay for the experts actually on your team.

• 🧠 Consultant: WeScaleStartups publishes a growth diagnosis at £2,000 to £4,000 and a 90 day sprint at £8,000 to £12,000. Its fractional CMO costs £5,000 to £8,000 a month, with a three month minimum.
• 🏢 Agency: Gripped retainers run £5,000 to £15,000 a month, plus media spend paid directly to the platforms.
• 🤝 Hybrid team: our channel experts cost around £1,000 each a month. A Growth Strategist adds £2,000 to £3,000, and a typical full team lands at £5,000 to £10,000.
• 👤 Full time hire: salary plus employer National Insurance at 15% above £5,000. On a £70,000 salary that's £9,750 a year, before pension, recruitment fees or software.

That last one is my own arithmetic rather than a quote, so swap in your own salary. And remember a full time hire is one person with one skill set. Honestly, that's the trap I see founders fall into most often.

Budgets are tight everywhere right now, which makes a wrong pick more expensive. Gartner's CMO spend survey found 59% of CMOs lack the budget to execute their strategy, and 39% plan to cut agency budgets. It covers 402 leaders, mostly at much bigger companies than a scaleup, so it's not a perfect match. But the pressure on every pound is the same.

A worked example for a Series A SaaS scaleup

This one's an illustration rather than a client case, but it's a pattern I see a lot.

Picture a B2B SaaS company with £3M ARR and a £12,000 monthly growth budget. Pipeline has been flat for two quarters, the founder suspects paid search, and the data is patchy.

A consultant spends two weeks on a diagnosis, priced around £3,000. They find paid search closes well but is capped, and outbound has never been properly tested.

So now there are two paths. Hire an agency for paid search at £8,000 a month and test outbound alone? Or build a small fractional team that tests both in parallel?

The second costs about the same but answers far more questions in the first 90 days. That's the logic behind a hybrid, and it's why I rarely recommend a single-channel agency as the first hire.

When is a consultant the right hire?

When the problem is direction rather than delivery. The signals I look for:

• ❓ You can't say which channel produces your best pipeline, and your reports disagree
• ⚔️ Sales and marketing argue about what a qualified lead is
• 🧭 You have in-house marketers who can execute but need a senior steer
• 📅 You're a few months off hiring a head of marketing and want the plan set before they arrive
• 💷 You'd like to test a diagnosis cheaply first

If three or more of those sound familiar, buy thinking before capacity. A two week diagnosis costs far less than a wasted quarter!

When is an agency the right hire?

When the plan is proven and the bottleneck is people. Look for:

• 📈 One channel already produces pipeline and you want more from it
• 🛠 No in house skills in paid media, search or creative
• 🚀 A launch or funding milestone that needs a fast ramp
• 👀 Your leadership team can review results, but managing a bench of specialists isn't realistic
• 💰 Budget for the retainer plus media spend

If that's you, my recommendation is simple: pick an agency that reports on pipeline, not just leads, and ask for numbers from clients at your stage.

What does a bad fit look like in either model?

A bad consultant fit has a few tells. The proposal is mostly a report, nobody owns delivery after the final slide, and there's no week three plan.

A bad agency fit looks different. They propose a channel before they've seen your data, the senior person from the pitch vanishes after signing, and reporting stops at clicks and leads (did those ever truly tell anyone anything?).

Either way, act early. Ending an £8,000 retainer after one quarter hurts far less than another six months of it.

What is the IR35 question UK scaleups forget?

Independent consultants often invoice through their own limited company, and that triggers a question a lot of founders have never heard of. HMRC's off payroll working rules, known as IR35, decide whether the worker is really an employee for tax.

For medium and large clients, the client is responsible for that decision. Get it wrong and you could owe Income Tax and National Insurance on the consultant's fees. The rules apply contract by contract too, so one consultant can be treated differently across engagements.

I'm not a tax adviser (thankfully!), so check with your accountant before you sign, and factor the admin into the cost of going solo. Buying from an agency or managed team usually avoids the question entirely, since you're contracting with a company.

What is the hybrid model?

The hybrid model is a fractional team: a senior strategist plus channel specialists, without the overhead of a full agency or full-time hires. If I'm honest, it's the one I'd pick for most scaleups, though it's also how we work, so take that with a pinch of salt!

At Growth Division, a Growth Strategist designs the plan and recommends channels based on data, then vetted channel experts rotate in or out as experiments report back.

Because the strategy layer is channel agnostic, the bias problem mostly goes away. If paid LinkedIn stops working, the strategist moves budget to something that does. You can see how it fits together on the fractional marketing services page.

For demand generation specifically, the team runs a 90-day cycle across content, paid media, nurture flows and outreach, judged on pipeline contribution rather than surface metrics. The demand generation service page has the detail.

The trade-off? You won't get a huge dedicated bench of in-house staff. And it isn't built for pre product market fit (PMF) startups still searching for a product.

📕 Want the wider comparison, including in-house hires? Read our three-way comparison before you decide.

What should the first 90 days look like?

Whoever you hire, the rhythm should look pretty similar. In weeks one and two, they audit your ICP, your funnel data and your tracking, and if tracking is broken, fixing it comes first.

In weeks three to six, they launch two or three small tests, each with a hypothesis, a timeline and a success metric. That's how we run experiments at Growth Division, and it works for any partner.

In weeks seven to twelve, they double down on what showed signal and kill the rest, reporting on pipeline, cost per qualified opportunity and what they learned. If your partner can't describe this rhythm, they're improvising on your budget.

Does company size change the answer?

Yes, a little. This is my rule of thumb, not a law.

At roughly £1M to £3M ARR, you usually need direction more than volume, so a consultant or a hybrid team fits best.

At £5M to £20M ARR, you've often got a proven channel. An agency can then add real capacity, as long as someone senior owns the strategy.

Above that, you're probably building an in-house team, with agencies filling specialist gaps like paid media or search. For reference, Gripped targets companies between £2M and £50M ARR, which tells you where agency models tend to fit.

How do you decide in five questions?

I'd run through these in a 30-minute meeting with your leadership team:

• ✅ Do we have a validated channel? If not, start with a consultant or a hybrid team.
• 🙋 Who will run the plan on Monday? If nobody, you need execution capacity.
• 💷 Is our budget above £5,000 a month? If not, start with a diagnosis, not a retainer.
• ⏱ How fast do we need to change direction? If fast, avoid long minimum terms.
• 🎯 Who owns the outcome? If it's you, make sure someone senior reports on pipeline.

Your answers will usually point one way. Mixed answers point toward the hybrid.

What should you ask before you sign either one?

The best proposals are specific. Ask a consultant what you'll actually have in your hands after two weeks, and ask an agency what happens if the first channel fails.

Then ask both for references from companies at your stage. A £2M ARR scaleup and a £40M ARR scaleup need very different programmes.

Ask how success is measured, too. At this stage pipeline and revenue are the only metrics that matter. Impressions and form fills are the usual excuses.

And check how the handover works. A good consultant leaves you a playbook your team can run. A good agency leaves you clean data, documented campaigns and access to every account.

Frequently asked questions

Can I hire a consultant first and an agency later?
Yes, and it's often the best order! Let the consultant write the brief, set the metrics and shortlist agencies, so you buy execution with a plan already in hand.

How much should a scaleup spend on demand generation each month?
It depends on your sales cycle and ARR. Growth Division's scaleup clients typically budget £10,000 or more a month on growth, which covers the team, with channel spend planned separately.

Is a consultant cheaper than an agency?
For a diagnosis, almost always. For a full programme, it depends who does the work, and a cheap plan that needs a £10,000 a month team to run isn't really cheap.

Will an agency give me honest advice on channels?
Some will, but the incentive points the other way. An agency that sells one channel profits when you buy more of it, so ask how they'd advise you if the best channel was one they don't offer.

What if my budget is under £5,000 a month?
Start with a diagnosis at £2,000 to £4,000 instead of a retainer. Use it to pick the one channel worth testing, then run small experiments yourself before you buy capacity.

How long before demand generation shows up in pipeline?
Expect early signal in the first three months and clearer channel winners by month nine. Our delivery model runs testing in months one to three, then channel clarity from three to nine, and scaling comes after that.

Not sure which one you need?

Give me a shout and book a free Bullseye Call with the team. We'll map your channels and tell you plainly whether you need a consultant, an agency, or neither.