How to choose a PPC agency: twelve questions and the red flags to watch for
Choose a PPC agency by testing the claims a website cannot fake: whether its own sitemap matches the specialism it advertises, whether it publishes pricing, whether you will own your own Google Ads account, and whether it reports on cost per lead rather than clicks. Below are the twelve questions that put those tests to a shortlist — grouped by what each one exposes, with the red flag it is designed to surface — plus the honest answer to who the "best" agency actually is.
Before you shortlist: agency is only one of three models
The questions below assume you have already decided an agency is the right buy. If a few skilled hours a week would cover the work, read PPC agency vs freelancer first; if paid search could fill a full-time role, read PPC agency vs in-house. Both pages state plainly when each model beats an agency — this one included.
three models · decide the model before the vendor
Questions 1–4: proof and specialism
Anyone can claim a specialism; these four questions check whether the claim survives contact with evidence. Ask them of every shortlisted agency and compare the answers in writing — which agency specialises in PPC is a question that gets easier to answer once you have all four in front of you.
1. The sitemap test
"Where on your website is the work you would do for a business like mine?"
A genuine specialist's site structure shows the specialism: named service and industry pages, not a strapline. If they claim lead generation but their sitemap sells ecommerce, SEO and social to everyone, the claim is marketing.
red flag — the specialism exists only in the sales deck
2. Evidence with the measurement attached
"Walk me through one result for a business like mine — the starting point, what changed, and what it did to cost per lead."
A real answer names the metric, the method and the time period; a rehearsed one names a percentage with nothing behind it.
red flag — results quoted without the measurement behind them
3. Who actually does the work
"Who will build and run my account day to day, and how many other accounts does that person manage?"
Sold by a senior, delivered by a junior is the category's standard failure mode; find out before you sign, not after.
red flag — the person in the sales call never touches accounts
4. A reference you pick
"Can I speak to a current client in a similar industry — one I choose from your client list, not one you choose for me?"
Any agency can produce a friendly quote; a client you selected is harder to stage.
red flag — references available only as written testimonials
Questions 5–8: money and measurement
These four establish what you will pay, what you will be shown, and whether either survives scrutiny.
5. The fee, in writing
"What is the fee, exactly what does it include, and is it flat, a percentage of spend, or a hybrid?"
Each model rewards different behaviour — a percentage fee earns more when you spend more, whether or not the leads follow. The models are compared at how much PPC agencies charge in the UK; ours are on the published PPC management pricing page.
red flag — pricing revealed only after a "strategy session"
6. What lands in the report
"What will you report each month, and is cost per lead the headline number?"
Clicks, impressions and click-through rate are diagnostics; leads and what they cost are results. A PPC management company that reports traffic as if it were revenue is answering a question you did not ask.
red flag — reports built around traffic, not enquiries
7. Budget honesty
"Is my budget actually enough for this to work — and will you tell me if it is not?"
The economics of a small budget either work or they do not; a good agency will show you the arithmetic and decline maths that cannot work — see what's a good Google Ads budget for lead generation.
red flag — every budget is somehow "a great starting point"
8. Time to judgement
"How long until we can fairly judge whether this is working, and what will you show me in the meantime?"
The honest timeline is weeks of accumulating evidence, not a week-one verdict and not an unexamined six months — see how long Google Ads takes to work.
red flag — guaranteed results before they have seen your data
Questions 9–12: control, contracts and exit
The questions agencies least enjoy — which is why they are asked last, when you are comparing final answers, and always in writing.
9. Account ownership
"Will the Google Ads account be mine — my name, my billing — with you working through manager access?"
The single most consequential question on this page. When an agency runs your spend inside an account it owns, your campaign history, Quality Score history and conversion data are theirs, and they stay theirs when you leave. This is a known industry trap, and it is the deal-breaker whatever else is true.
red flag — "we run everything through our master account"
10. Access to the data
"Will I have admin access to the ad account and the conversion tracking from day one?"
A dashboard is a picture of the data; access is the data. You should be able to open the account yourself, any day, without asking.
red flag — a reporting portal instead of account access
11. Notice period, and what leaves with you
"What is the notice period, and exactly what do I keep — campaigns, landing pages, tracking — if we part ways?"
Rolling monthly terms after an initial period are normal; long lock-ins with auto-renewal are not a sign of confidence.
red flag — exit terms they will not put in the contract
12. Conflicts of interest
"Do you already run ads for my direct competitors, and how do you handle that?"
In niche verticals the same agency bidding for two rivals on the same keywords is a real and common conflict; the answer should be a policy, not a shrug.
red flag — no policy for competing accounts
Five answers that end the conversation
- They insist the ad account sits in their name (question 9 — the trap).
- They guarantee rankings, lead volumes or a fixed cost per lead before seeing your data.
- They publish no pricing anywhere and will not state a fee in writing.
- They report clicks as if clicks were the result you are buying.
- They cannot name what they would measure to call the engagement a failure.
Any one of these is enough — thank them for their time and move down the shortlist.
Why nobody can name the best PPC agency
No audited league table of PPC results exists. Every list claiming to name the agency with the best PPC results is self-published — usually by an agency on the list. That is why buyers triangulate through reviews and Reddit threads, and the instinct is right: unverifiable claims deserve suspicion.
"Who has the best PPC advertising strategy in the UK" is unanswerable as asked: strategy quality only shows up in the twelve answers above, account by account.
The "big 6" the SERP asks about are advertising holding groups — WPP, Omnicom, Publicis, Interpublic, Dentsu and Havas — which sell enterprise media through their networks; they are not where a UK service business buys lead-generation PPC.
Which agency specialises in PPC is a question a sitemap answers better than a strapline — apply question 1 to every candidate.
We keep a comparison of best PPC agencies UK with the criteria published and GrowthLine listed without self-crowning. Judge us the same way you would judge anyone on it: our specialism claim is on our home page for checking against our own sitemap, and our fees are public.
The 40/40/20 and 70/20/10 rules, briefly
The 40/40/20 rule is a direct-marketing rule of thumb: roughly 40% of a campaign's success comes from reaching the right audience, 40% from the strength of the offer, and 20% from the creative. Its lesson for paid search: targeting and offer beat clever ad copy.
The 70/20/10 rule is a budget-allocation heuristic: 70% of spend to what is proven, 20% to what looks promising, 10% to experiments.
Neither rule chooses an agency for you — but asking a candidate how they would split your budget, and why, is question 13 if you want one.
Frequently asked questions
How do I choose a PPC management company?
Test claims the company cannot fake: check its own sitemap against the specialism it advertises, ask for one result with the measurement behind it, confirm the Google Ads account will be owned by you, and get the fee — and what it includes — in writing. Put the same twelve questions on this page to every company on your shortlist and compare the written answers side by side. The pattern of answers matters more than any single one: a company that is transparent about fees, access and exit terms before you sign tends to stay transparent after.
What should a PPC agency report on?
The headline numbers should be leads and cost per lead against an agreed target — the things you are actually buying — alongside spend, what changed in the account that month, and why. Clicks, impressions and click-through rate belong in the report as diagnostics, not as results. The report should also confirm that conversion tracking is verified and working, because when tracking silently breaks, every other number in the report is fiction.
What are red flags when hiring a PPC agency?
The big five: insisting the ad account sits in the agency's name rather than yours; guaranteeing rankings, lead volumes or a fixed cost per lead before seeing your data; refusing to publish or state pricing in writing; reporting clicks and traffic as if they were results; and long lock-in contracts with auto-renewal. Any one of these is grounds to walk away, however good the pitch — they are structural problems, not negotiating points.
Should a PPC agency own your Google Ads account?
No — the account should be yours: your name, your billing, with the agency working through manager access. The account holds your campaign history and conversion data, and whoever owns it keeps all of that if you part ways; agencies that insist on running spend through accounts they own are building a switching cost into the relationship. Account ownership is the one answer on this page worth treating as an outright deal-breaker.
Put the twelve questions to us
Our answers are already public — the comparison criteria are published at best PPC agencies UK — and a free audit shows you how we work before any engagement, findings in writing either way.