A performance marketing agency runs the paid channels where you pay for a click, a lead or a sale and can measure what came back. Google Ads, Microsoft Ads, Meta, TikTok, Amazon. Its job is to turn ad spend into revenue or leads at a return your business can live with, and to prove it with numbers you can check.
That’s the definition. The more useful question is what it should be measured on, because that’s where most of the disappointment with agencies starts.
How is it different from a digital marketing agency?
Scope and accountability, mostly.
A full-service digital marketing agency will often do SEO, social content, email, web design and paid ads under one roof. That can work well. It also tends to mean paid media is one department among several, and the reporting leans towards activity: posts published, pages optimised, campaigns launched.
A performance marketing agency does less, on purpose. It lives in the channels where every pound has a measurable outcome attached, and it’s judged on that outcome. If the numbers don’t move, there’s nothing else in the report to hide behind.
Neither is better in the abstract. If you need a brand built from nothing, a performance agency is the wrong hire. If you already have demand and need paid media to turn it into sales profitably, it’s usually the right one.
What should it actually be doing each week?
Less of the dashboard work people imagine, and more of the unglamorous work around it.
- Checking conversion tracking still fires correctly before trusting any number in the account
- Reading search terms and placements, and cutting spend that goes nowhere
- Keeping the product feed healthy on ecommerce accounts, because Shopping and Performance Max can only be as good as the feed
- Setting bid targets from your margins, not from an industry average
- Testing ad copy and landing pages with enough traffic to reach a real answer
- Moving budget between campaigns and channels based on what’s returning, not what was planned in January
- Telling you plainly when something isn’t working, and what they’ll change
A lot of that happens outside the ad platform. An agency that never asks for access to your analytics, your feed or your sales data is only seeing half the picture.
What should a performance marketing agency be measured on?
The number your business actually runs on. That’s rarely the one the ad platform shows you first.
Platform ROAS is a starting point, not the answer. A 5x return in Google Ads sounds healthy. On a product with a 30% margin, after fees and returns, it can be close to breaking even. The same 5x on a 70% margin product is excellent. Without your margin, a ROAS target is just a number somebody chose.
Cost per lead needs a lead to sale rate behind it. Fifty leads at £20 each isn’t cheaper than twenty at £40 if only two of the fifty were real enquiries. An agency worth hiring will ask what happens to the lead after the form is submitted.
Some credit is claimed twice. Google, Meta and your analytics will each take credit for the same sale. If an agency reports platform numbers added together, the total will look better than your bank balance. A blended view, total revenue against total ad spend across every channel, is the check that keeps everyone honest.
Brand search flatters everything. People who were already searching for you by name would mostly have found you anyway. It’s worth running, but it should be reported separately so it doesn’t prop up campaigns that aren’t pulling their weight.
A good agency will agree these measures with you before the work starts, and it’ll want your numbers to do it.
Does performance marketing mean I only pay for results?
Not usually, and it’s worth being careful with agencies that say it does.
“Performance” describes the channels and how they’re measured, not necessarily the fee. Most performance agencies charge a monthly retainer, either flat or as a percentage of ad spend. Pure pay-per-result deals exist, but they’re priced off a metric the agency also tracks and reports, so the definition of a result becomes the whole negotiation.
A flat fee set by spend band tends to be the cleanest option. Our pricing page shows how that works if you want a reference point. We’ve also written about the questions that separate one agency from another, including how each fee model shapes what the agency is paid to do.
When is it the wrong time to hire one?
A few situations where I’d hold off, even though it means turning work away.
Your tracking doesn’t work. If you can’t reliably see which sales or leads came from ads, fix that first. Any agency optimising on broken data is making it worse faster.
The budget is too small to learn from. Automated bidding needs conversion volume to work. Under roughly £1,500 to £2,000 a month in ad spend, a retainer struggles to pay for itself, and you’re often better running one channel carefully yourself. The Google Ads cost breakdown goes into that floor in more detail.
The offer isn’t proven. Paid media amplifies what’s already there. If the product, price or website isn’t converting organic visitors, ads will usually just make that more expensive to discover.
You want brand awareness, not sales. That’s a legitimate goal. It’s just measured differently, and a performance agency will keep steering you back to conversions.
What should I expect in the first 90 days?
Roughly three phases, though every account is different.
The first few weeks are an audit and a tidy-up. Tracking gets checked, wasted spend gets cut, and targets get set from your margins. Results can improve quickly here, simply from stopping the leaks.
The middle stretch is restructuring and testing. Campaigns get rebuilt where they need to be, new ads and landing pages go into testing, and automated bidding gets time to settle. Numbers can wobble during this part, and a good agency will warn you before it happens rather than explain it afterwards.
By month three you should be able to see whether the account is heading in the right direction against the measures you agreed at the start. Not finished, but clearly moving or clearly not.
- A performance marketing agency runs paid channels with measurable outcomes and is judged on those outcomes.
- The measure should be your margin, your lead to sale rate or your blended revenue, not the ad platform’s own ROAS.
- Much of the real work is tracking, feeds, search terms and landing pages, not just bids.
- “Performance” describes how the work is measured, not usually how the fee is charged.
- Fix broken tracking and prove the offer before you hire one.
- Agree what success looks like before the work starts, using your own numbers.
Frequently Asked Questions
What does a performance marketing agency do?
It plans, runs and optimises paid advertising where results can be measured directly: Google Ads, Microsoft Ads, Meta, TikTok and similar channels. The day-to-day work covers tracking, targeting, bidding, ad copy, product feeds and landing page testing. It’s judged on commercial outcomes such as revenue, leads or cost per sale rather than on reach or activity.
Is performance marketing the same as PPC?
Close, but not quite. PPC means pay-per-click advertising, mainly search and shopping ads. Performance marketing is the wider group of channels where you pay for a measurable action, so it also covers paid social, marketplace ads and some affiliate work. In practice most performance agencies spend the bulk of their time in PPC.
How much does a performance marketing agency cost in the UK?
Most charge a monthly retainer rather than paying per result. Smaller accounts commonly start around £500 a month, rising with ad spend and the number of channels managed. The fee should be looked at alongside your ad budget, since you pay both. Our pricing page sets out a spend-banded flat fee as a worked example.
How do I know if a performance marketing agency is working?
Compare against the measures agreed at the start, using your own figures rather than the platform’s. Look at blended revenue against total ad spend, cost per real sale or qualified lead, and whether the trend is heading the right way over two to three months. If the report only shows clicks, impressions and click-through rate, ask for the commercial numbers.
Do I need a performance marketing agency or can I run ads myself?
On a small budget in one channel, running it yourself can make sense, especially if you have time to learn. An agency earns its fee once spend is large enough that mistakes get expensive, or when you’re running several channels and need someone watching tracking, feeds and budget allocation together.
Want a second opinion on your paid media?
We’ll look at your account against your own numbers and tell you plainly what we’d change.
Contact Us