Choosing a paid ads agency is mostly a question about incentives. The work itself is well understood and the platforms have automated much of the manual optimisation that agencies once charged for, which means the difference between a good engagement and a bad one now sits in three places: who owns the accounts, how the fee is calculated, and whether anyone is thinking about what happens after the click. Buyers who get those three right rarely have a disaster, and buyers who get the fee model wrong end up funding an agency's growth rather than their own.
Fee models decide behaviour
There are four common shapes. A percentage of ad spend is the most widespread and the most misaligned, because the agency's income rises when your budget rises whether or not the return improves, and it falls when the correct advice is to cut a campaign. A flat monthly fee is easy to compare and neutral about budget, but gives no upside for growth and can quietly become expensive on small accounts. A performance component, paid on qualified leads or revenue, aligns incentives but requires a definition precise enough to survive a dispute, including what counts, who counts it and how disputed conversions are resolved. Hybrid models, a floor plus performance, are common and reasonable. Whichever you choose, ask the uncomfortable question in the sales meeting: what happens to your fee if the right recommendation is to spend less? The answer, and how readily it comes, tells you more than any case study. When you are comparing local providers, this question travels well and is worth asking of every candidate you find near you.
Ownership, access and what happens when you leave
You should own every advertising account, the analytics property, the tag manager container, the conversion definitions and the creative assets, with the agency granted user access on your accounts. Agencies that run your campaigns inside their own manager account can hand over campaign structures but often not the account history, and that history is the learning that makes automated bidding work. Losing it can set performance back by months, which is a switching cost you did not agree to pay. Establish it before you sign, in writing, and check it during onboarding rather than taking it on trust. The same principle applies to phone numbers used for call tracking, landing pages built in an agency tool, and audience lists built from your customer data. Ask a simple question of every candidate: if we part company in a year, what exactly do we keep, and what stops working the next morning?
The click is the middle of the job, not the end
Most underperforming ad accounts are not badly built. They are pointed at pages that do not answer the query, or at a business that does not follow up quickly. An agency worth its fee will insist on landing page work, will ask what happens to a form fill in the first hour, and will refuse to keep spending on a campaign whose leads are never called. The Federal Trade Commission's guidance on advertising and marketing online is a reminder of the other half of that responsibility: claims made in ads must be truthful and substantiated, and disclosures must be clear and conspicuous rather than buried. That constrains the aggressive copy that often tests well, and a good agency will tell you so before the platform or a regulator does. Ask candidates what they refuse to write, and ask to see the follow-up process they expect from your side.
Reporting that lets you tell work from invoice
Insist on three things in a monthly report. First, what changed: named campaigns, budgets moved, creative shipped, tests started and stopped. An account where nothing changed for a quarter is being billed, not managed. Second, performance separated between branded and non-branded terms, because branded conversions are largely demand you already had and mixing them makes every account look competent. Third, results against the definition of a qualified lead or a sale you agreed at the start, not against raw conversion counts from the platform. Ask for access to the accounts so you can see the change history yourself. Agencies that resist that are protecting something, and the usual something is how little time the account actually receives.
Questions people ask about paid ads agency
Is a percentage of ad spend ever acceptable?
It is workable when the budget is stable and the scope is genuinely proportional to spend, but it always rewards spending more. If you use it, cap it, review it when budgets change materially, and agree in writing what happens to the fee if the recommendation is to reduce spend.
How much management does a small account need?
Less than agencies often sell, but not nothing. Small accounts mostly need correct conversion tracking, disciplined negative keywords, good landing pages and someone checking monthly. If a proposal for a modest budget describes weekly optimisation sprints, ask what they will actually do each week.
Should the same agency handle ads and landing pages?
It helps, because message match between query, ad and page is where most of the gain sits. What matters more is that one named person owns that chain. Splitting ads and pages across two suppliers works only if someone is accountable for the join.
How quickly should we expect results?
Paid channels give signal within weeks, which is their advantage. Expect the first month to be tracking, structure and creative, and expect meaningful judgement by month three. Anyone promising transformation in week two has not looked at your conversion data.