PPC Agency: How to Choose, Brief, and Get Results From One

A PPC agency manages paid advertising campaigns on your behalf, typically across Google, Meta, Microsoft, and other platforms, with the goal of generating traffic, leads, or sales at a profitable cost. The right agency can compound your returns significantly. The wrong one will burn your budget methodically while producing reports that look busy but explain nothing.

This article covers what PPC agencies actually do, what separates competent ones from expensive ones, and how to structure the relationship so you get commercial outcomes rather than activity metrics.

What Does a PPC Agency Actually Do?

At the operational level, a PPC agency plans, builds, manages, and optimises paid advertising campaigns across one or more digital platforms. That includes keyword research, audience targeting, ad copywriting, bid management, landing page recommendations, and performance reporting. On paper, the scope is clear. In practice, the quality of execution across each of those areas varies wildly.

The platforms most agencies work across include Google Ads (formerly AdWords), Microsoft Advertising, Meta, LinkedIn, and increasingly TikTok. Each platform has its own auction mechanics, audience behaviour, and creative requirements. A generalist agency that claims equal expertise across all of them is usually stretching the truth. The better agencies tend to have genuine depth in two or three platforms and honest limitations on the rest.

If you want a fuller picture of what PPC management services cover in practice, including what you should expect to be included in a managed retainer versus what typically costs extra, that breakdown is worth reading before you start talking to agencies.

Paid advertising sits within a broader acquisition ecosystem. The Paid Advertising Master Hub on this site covers the full landscape, from channel selection to measurement frameworks, and is a useful reference point if you are building or reviewing your paid strategy from the ground up.

How Fast Can PPC Actually Work?

Faster than most marketers expect, when the conditions are right. One of the things I find clients consistently underestimate about paid search is the speed of commercial feedback. When I was at lastminute.com, we launched a paid search campaign for a music festival, a relatively straightforward campaign without complex automation or elaborate creative, and we saw six figures of revenue within roughly a day. That kind of speed is not the norm, but it is not a fluke either. Paid search captures existing demand. If the intent is there and your offer is competitive, the gap between campaign launch and revenue can be very short.

That speed is one of the genuinely undervalued commercial properties of PPC. It is also why poor campaign setup is so costly. A badly structured account does not just underperform slowly, it burns budget at pace. The auction does not wait for you to notice. Understanding how Google Ads works at a mechanical level, including Quality Score, auction dynamics, and match types, is not optional if you want to brief or evaluate an agency with any credibility.

For a clear breakdown of how PPC works as a model, including the auction mechanics and cost structures, Semrush has a solid explainer that covers the fundamentals without oversimplifying them.

What Separates a Strong PPC Agency From a Weak One?

This is where most client-side marketers struggle, because the surface signals are unreliable. Platform certifications, case study decks, and award shortlists tell you very little about day-to-day execution quality. I have judged the Effie Awards, and I can tell you that the campaigns that win effectiveness awards are rarely the ones that look most impressive in a pitch. They are the ones where someone made a clear commercial decision and followed it through with discipline.

The markers that actually matter when evaluating a PPC agency are more operational than presentational. Can they explain why they structure accounts the way they do? Do they talk about business outcomes before they talk about platform features? When something is not working, do they tell you clearly, or do they bury it in a reporting slide?

One of the most telling questions you can ask in an agency pitch is: “Tell me about a campaign that did not work and what you learned from it.” The answer reveals more about the agency’s culture than any case study they have prepared in advance.

Account structure matters enormously and is often where weaker agencies cut corners. Poor account management compounds over time, making optimisation harder and wasting spend on structural problems that should have been avoided at setup. If you inherit an account from a previous agency, an audit of the structure is usually the first thing worth doing before you change anything else.

What Should You Expect to Pay a PPC Agency?

Agency pricing models vary, but the three most common structures are a flat monthly retainer, a percentage of ad spend, and a performance-based fee (usually tied to leads or revenue). Each has trade-offs, and none of them is inherently better than the others. What matters is whether the fee structure aligns the agency’s incentives with your commercial goals.

A percentage of ad spend model, typically between 10% and 20%, can create a misalignment if the agency benefits from increasing your budget regardless of whether that increase is justified by performance. A flat retainer removes that incentive but can lead to complacency if there is no performance accountability built into the contract. Performance-based models sound attractive but can be gamed if the metrics are not defined precisely enough.

The other cost dimension that clients frequently underestimate is the platform spend itself. Google advertising fees vary significantly by industry, keyword competitiveness, and quality score, and the gap between what you budget and what you actually spend efficiently can be substantial without proper management. Understanding the cost mechanics before you brief an agency prevents a lot of unpleasant surprises in month three.

Which Platforms Should Your PPC Agency Be Running?

The honest answer is: the ones where your customers are, not the ones the agency is most comfortable with. This sounds obvious, but the bias is real. Most PPC agencies have a Google-first orientation because Google remains the dominant paid search platform. That orientation is often correct, but it is not always correct, and it should be arrived at through audience analysis rather than default.

For businesses targeting younger demographics, TikTok Ads have matured considerably as a direct response channel. The creative requirements are different from search, the audience behaviour is different, and the measurement approaches need to account for a longer attribution window in some categories. An agency that dismisses TikTok entirely in 2025 is probably not keeping pace with where attention is moving.

At the other end of the spectrum, Google’s reach extends further than most clients realise. Google Ads can appear on Yahoo search results through syndication agreements, which affects how you think about reach and frequency when planning budgets. It is a detail, but it is the kind of detail that matters when you are managing significant spend.

For local or niche businesses, the platform mix question is particularly important. A beauty salon running paid search has very different platform priorities from a B2B software company. The Google Ads approach for beauty salons illustrates how local intent, geographic targeting, and service-specific keywords require a different setup than a national brand campaign. The principles are the same; the execution is different.

How Important Is Keyword Strategy in PPC?

It is foundational. Everything else in a paid search campaign, the bids, the ad copy, the landing pages, sits on top of the keyword strategy. Get it wrong and you are either missing the people who would convert or paying to reach people who never would. Both are expensive mistakes.

The most common keyword mistake I see in accounts inherited from previous agencies is an over-reliance on broad match keywords without proper negative keyword management. The account looks active, spend is moving, impressions are high, but the traffic is diffuse and the conversion rate is poor. Tightening match types and building out a negative keyword list often produces immediate efficiency gains without touching bids or creative.

Intent is the thing that most keyword strategies underweight. The difference between someone searching “marketing agency” and “marketing agency London pricing” is not just specificity, it is commercial readiness. Structured keyword research that maps terms to intent stages, informational, commercial, transactional, gives you a much cleaner basis for bid decisions and landing page selection.

Ignoring user intent is one of the most direct ways to waste budget in paid search. Misaligning ads with user intent means you pay for clicks from people who were never going to convert, regardless of how good your landing page is. A strong PPC agency will map intent explicitly rather than treating all traffic as equivalent.

What Role Do Landing Pages Play in PPC Performance?

A larger role than most clients assign to them. PPC agencies are often evaluated on click-through rates and cost-per-click, which are metrics the agency can directly influence. Conversion rate on the landing page is where a lot of the commercial value is created or destroyed, and it is frequently outside the agency’s direct control.

This creates a structural problem in many agency relationships. The agency optimises for what it controls, the client sees disappointing conversion numbers, and neither party is fully accountable for the gap. The way to close that gap is to make landing page performance a shared metric from the start of the engagement, not an afterthought.

PPC landing pages should be built to match the specific intent of the ad that drove the click. A generic homepage is almost never the right destination for a paid search ad. Message match, load speed, and a single clear call to action are the basics. An agency that sends paid traffic to your homepage and then blames the conversion rate is not doing its job.

Google’s own ad personalisation is more sophisticated than most clients realise. Ad serving is influenced by previous search behaviour, which means the ad experience your customers see is not identical to what you see when you search for your own keywords. This has implications for how you test and review your campaigns, and it is something a good agency should be accounting for in their reporting methodology.

How Should You Brief a PPC Agency?

Most agency briefs I have seen in my career are either too vague to be useful or too prescriptive to leave room for expertise. The brief that works best defines the commercial problem clearly, sets a measurable objective, and gives the agency enough context about the business to make intelligent decisions. It does not tell the agency how to do its job.

The commercial problem is the starting point. Not “we want more traffic” but “we need to acquire customers at a cost below £40 per acquisition to maintain margin at our current pricing.” That level of specificity changes everything about how an agency plans and optimises a campaign. It gives them a number to work towards rather than a direction to drift in.

One thing I push back on consistently is the client request for “innovation” in paid campaigns without any definition of what problem that innovation is supposed to solve. I have sat through agency pitches where the lead idea was VR-driven ad formats, AR overlays, or some other format that was genuinely impressive as a piece of technology and completely disconnected from the business problem at hand. Innovation is not a brief. It is a potential solution to a defined problem. If you cannot articulate the problem, you have no basis for evaluating whether the innovation is relevant.

A good brief also includes what success looks like at 30, 60, and 90 days. PPC has a ramp period, particularly in competitive categories where the algorithm needs data to optimise effectively. Setting expectations around that timeline prevents the premature cancellation of campaigns that were on the right trajectory but had not yet reached statistical significance.

What Should a PPC Agency Report On?

The metrics that connect to your business outcomes, not the metrics that make the agency look busy. This sounds obvious, but the reporting problem in PPC is endemic. Agencies default to impressions, clicks, and CTR because those are the metrics they can move most easily. The metrics that matter to a business, cost per acquisition, return on ad spend, revenue contribution, require more work to calculate and more honesty to present when they are moving in the wrong direction.

When I was growing iProspect from a team of 20 to over 100 people, one of the things we worked hardest on was connecting campaign performance to client P&Ls rather than platform dashboards. Platform dashboards are a perspective on reality. They measure what happened inside the platform. They do not tell you whether the business grew. That distinction matters, and the best agencies understand it.

Attribution is where reporting gets genuinely complicated. Last-click attribution, which is still the default in many accounts, systematically overstates the contribution of bottom-of-funnel keywords and understates the contribution of everything higher up. A PPC agency that reports only on last-click attribution without acknowledging its limitations is either not thinking carefully about measurement or is not incentivised to.

Ask your agency to show you the same data in at least two attribution models. The gap between them is where the interesting commercial questions live. A paid search agency worth its retainer should be comfortable having that conversation rather than steering you back to the dashboard.

When Should You Move On From a PPC Agency?

The most common mistake clients make is staying too long. There is a sunk cost logic that sets in after a few months of mediocre performance: the account has history now, switching will reset the learning, the next agency might be worse. Some of that reasoning is legitimate. Most of it is rationalisation.

The signals that warrant a serious conversation, if not an exit, are consistent. Performance is declining or flat against agreed targets. The agency is explaining underperformance rather than fixing it. Reporting has become more complex without becoming more useful. The people who pitched the account are no longer the people managing it. Any one of these is a reason to ask hard questions. Two or more together is usually a reason to start looking.

The transition risk is real but manageable. A well-documented account handover, including campaign history, audience lists, and conversion data, means an incoming agency is not starting from zero. The learning period for a new agency on a well-structured account is shorter than most clients fear. What takes time is rebuilding trust, and that is a people problem, not a platform problem.

Across 20 years managing agency relationships on both sides of the table, the engagements that lasted and delivered were built on honest communication about what was working, what was not, and what the agency needed from the client to do better. The ones that failed were usually characterised by one or both parties avoiding that conversation for too long.

If you are building out your broader paid strategy beyond a single agency relationship, the Paid Advertising Master Hub covers channel strategy, measurement, and platform selection in more depth, and is worth bookmarking as a reference as your programme scales.

About the Author

Keith Lacy is a marketing strategist and former agency CEO with 20+ years of experience across agency leadership, performance marketing, and commercial strategy. He writes The Marketing Juice to cut through the noise and share what actually works.

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