Google Ads agencies: how to choose one that won't eat into your ROAS (a no-nonsense guide, 2026)

Hiring a Google Ads agency should be a straightforward decision. In practice, it's one of the most opaque areas of digital marketing: confusing pricing models, lengthy contracts, and metrics that sound impressive but reveal nothing about your business's profitability. This guide gets straight to the point: what an agency truly does, what you should demand from them, and when it makes more sense to explore alternative options.

What you should know about Google Ads agencies: What exactly does a Google Ads agency do (and what should it do)?

The official definition is convenient: 'we manage your Google campaigns.' However, that phrase encompasses everything from a 20-minute weekly check-in to a daily operation involving hourly bid adjustments, creative testing, and segmentation analysis by device, time, and location. The distinction between these two extremes is the difference between burning through your budget and making it profitable.

Genuine professional management covers, at a minimum: campaign structure (ad groups, negative keywords, match types), audience segmentation, bidding strategy, creative production and rotation, conversion tracking setup, and business-oriented reporting. If any of these elements are missing, the management is partial, even if the agency labels it 'full service'.

Campaign management vs. one-off setup - they are not the same

Some agencies set up the account initially and then rarely touch it. That's not management; it's activation. Active management involves frequently reviewing performance, adjusting bids based on real market behaviour, adding negative keywords when irrelevant searches emerge, and rotating creatives when CTR declines. An account that has gone three months without structural changes isn't being managed; it's simply being billed.

A direct question to ask any agency before signing: 'How many documented changes did you make to your clients' accounts last month?' If they don't have a concrete answer, you've already got your own.

What a traditional agency's "full service" includes (and what it doesn't)

The term 'full service' typically includes: initial setup, bid management, a monthly report, and email support. What's often excluded, unless explicitly negotiated, are: graphic or video creative production, landing pages, conversion tracking setup on your website, YouTube or Display network management, and systematic A/B testing.

Each of those missing elements represents a hole in the funnel. A perfectly optimised Search campaign that drives traffic to a landing page with no conversions is wasted money. Ensure the contract explicitly states what's included and what's charged separately.

Real optimisation frequency: every 15 minutes vs. 2-3 times per week

Most mid-sized agencies review their clients' accounts two to three times a week. This isn't negligence; it's the operational reality for a human team managing multiple accounts simultaneously. The issue is that Google Ads operates as a real-time auction system. Your budget is consumed hourly, and market conditions are constantly shifting.

Optimisation frequency has a direct impact on ROAS: a misaligned bid for just 48 hours during peak season can cost more than the agency's entire monthly fee. This is one of the strongest arguments in favour of AI automation for accounts with medium-to-high budgets.

What you should know about the commission model that eats into your margin - and the alternative?

The industry has an unwritten standard: agencies typically charge between 10% and a minority of your monthly Google Ads spend. At first glance, this seems reasonable. However, when you calculate it against your business's actual profit margin, the picture changes entirely.

How the hidden cost of a 10-a minority percentage on investment is calculated

The percentage is applied to the gross investment, not the profit it generates. This means that if your campaign has a significant net margin and the agency charges a minority percentage on the investment, you're effectively giving up half of your margin in management fees alone, even before accounting for product costs, logistics, or any other expenses. The true cost of the commission isn't the nominal percentage; it's what it represents relative to your operating margin.

Furthermore, the percentage-based model creates a perverse incentive: the more you invest, the more the agency charges, regardless of whether your ROAS improves. An agency operating under this model is incentivised to encourage you to increase your budget, not necessarily to lower your cost per conversion.

Real example: what happens with 3,000 €/month budget under commission

With a 3,000 euro monthly ad spend and a minority percentage commission, you'd pay 450 euros per month in management fees. Over twelve months, that amounts to 5,400 euros in commissions, in addition to the 36,000 euros invested in Google. If your campaigns' ROAS is 3x, you've generated 108,000 euros in gross revenue, but you've paid 5,400 euros solely for management, not including the product cost.

Now, imagine that same budget is managed with a significantly lower fixed monthly fee. The accumulated difference in fees over a year can be reinvested into more advertising budget, creatives, or improving your landing page. The impact on net ROAS is direct.

No-commission model - fixed fee vs. percentage on investment

The fixed fee model decouples the agency's remuneration from the investment volume. You pay the same whether you invest 2,000 or 5,000 euros per month. This better aligns incentives: the agency must demonstrate results to retain your business, not merely to encourage you to increase your budget.

The fixed fee model does have a genuine drawback: if your investment is very low, it might not be profitable for the agency, and the service quality could suffer. This is why it generally works better above certain minimum volumes. The hybrid model, a base fee plus a performance-based variable, attempts to balance both sides, though it adds complexity to the contract.

What you should know about the 7 key criteria for choosing a Google Ads agency in 2026?

Agency rankings proliferate online. Most sort them by turnover, longevity, or number of employees. None of these criteria will tell you if they'll improve your ROAS. These seven, however, will.

Criterion 1 - Google Partner Premier: what it really means (and what it doesn't guarantee)

The Google Partner Premier badge identifies agencies that surpass thresholds for managed ad spend, client retention, and technical certifications of their managers. It's an indicator that the agency handles significant volume and possesses technical expertise validated by Google. However, it does not guarantee ROAS results or transparency in reporting. There are Partner Premier agencies with dissatisfied clients and agencies without the badge that manage accounts with excellent performance. Use it as a minimum filter, not as a definitive criterion.

Criterion 2 - Transparency in reporting: real metrics vs. vanity metrics

Ask to see a sample report before committing. If the report primarily displays impressions, reach, and CTR, without ROAS, cost per conversion, or the actual number of conversions, you're looking at a vanity report. The metrics that truly matter are: ROAS per campaign, CPA (cost per acquisition), conversion rate, the actual number of conversions, and impression share for high-intent keywords.

Criterion 3 - Contract length and exit conditions

A contract length of a few months isn't necessarily bad if the agency needs time to optimise. The problem arises when a lengthy contract is combined with mediocre results and no performance-based exit clauses. Before signing, ask what happens if your ROAS hasn't improved after three months. If there's no clear answer, the contract length is a trap, not a guarantee of quality.

Criterion 4 - Number of managed channels (Search, Shopping, YouTube, Display)

Many agencies excel at Search but little else. For an ecommerce business in 2026, that's leaving money on the table: Shopping and Performance Max are frequently the channels with the best ROAS for physical products, and YouTube is the fastest-growing format for purchase intent. Explicitly ask which channels they manage and request examples of accounts where they've worked across all four.

Criterion 5 - Documented optimisation frequency

It's not enough for them to simply say, 'we review campaigns regularly.' Ask them to explain their process: how often they access the account, what they review in each session, and how they document changes. A reputable agency will maintain a change log for each account. If they don't have one, their management is informal.

Criterion 6 - Volume of creatives per month

The Google Ads algorithm learns faster when it has more variants to test. With only four or six creatives per month, learning is slow, and A/B tests are superficial. Results-oriented management systematically produces ad variants, across text, image, or video, enabling the algorithm to identify what converts best within each audience segment.

Criterion 7 - Own or agency-dependent conversion tracking

This is the most critical and most ignored criterion. If the agency sets up conversion tracking from its own Google Ads account, the conversion data belongs to them, not you. If you switch agencies, you'll lose all your conversion history, audience data, and the algorithm's accumulated learning. Insist that tracking is configured in your account, under your name, from day one.

What you should know about: comparative table - traditional agency vs. automated AI management?

The differences between the traditional agency model and automated AI management extend beyond just pricing. They impact optimisation frequency, creative volume, and contractual flexibility. This table outlines the most relevant variables to help you make an informed decision.

Variable	Traditional Agency (industry average)	Automated AI Management
Commission	10-a minority percentage of investment	a minority percentage
Reviews	2-3 times/week	Every 15 minutes
Creatives/month	4-8	20-40
Channels	1-2	4
Contract Length	a few months	Monthly
Reporting	Monthly PDF	real-time dashboard

For small businesses with up to 5,000 €/month ad spend: why the commission model doesn't make sense

With medium-to-low budgets, a 10-a minority percentage commission represents a disproportionate share of the total campaign cost. If you invest 2,000 euros per month and pay 300 in commission, you're allocating a minority percentage of your total budget to fees before Google even sees a euro. For a small business with tight margins, that can be the difference between a profitable campaign and one that fails to reach the profitability threshold.

The fixed fee model is more predictable and transparent for budgets in this range. You know exactly how much you're paying for management and can calculate your true net ROAS without any end-of-month surprises.

For ecommerce: the case of 4.82x ROAS with no-commission management

An ecommerce business with well-structured Shopping and Performance Max campaigns can achieve ROAS exceeding 4x when management is active and tracking is correctly configured. The 4.82x ROAS figure that Boomatik documents in its case studies isn't just a brochure number; it's the result of frequent optimisation, a high volume of creatives, and commission-free, multi-channel management that doesn't eat into your returns.

The difference between a 3.5x ROAS with a minority percentage commission and a 4.82x ROAS without commission isn't solely the percentage; it's the reinvestment of that margin into more budget, additional tests, and enhanced algorithmic learning.

Types of campaigns your agency should manage (and which ones they often ignore)

Google Ads isn't just Search. In 2026, a Google advertising strategy that overlooks Shopping, YouTube, or Display is effectively operating with half the map. However, many agencies specialise in Search and treat the other channels as additional services that are charged separately or simply not offered at all.

Search - the foundation everyone knows

Search campaigns capture existing demand: users who are already actively looking for what you sell. They represent the logical entry point for any new account and the channel with the highest immediate purchase intent. Effective Search management includes an ad group structure based on intent, weekly updated negative keywords, comprehensive ad extensions, and a bidding strategy aligned with the conversion objective, not solely with CPC.

Shopping and Performance Max - the ecommerce engine

For ecommerce businesses, Shopping and Performance Max are frequently the channels offering the best return. Shopping displays the product with an image, price, and store name directly in search results, effectively filtering purchase intent before the click. Performance Max combines all Google inventories into a single AI-managed campaign, with results heavily dependent on the quality of your product feed and the audience signals you provide.

An agency that doesn't manage these formats for an ecommerce business isn't managing the most profitable aspects of Google Ads. Explicitly ask if they have experience with Google Merchant Center and with optimising product feeds.

YouTube Ads - the format small agencies don't touch

YouTube is the world's second-largest search engine, and video content has a growing impact on purchase intent, especially in product categories where visual demonstration is crucial. Small agencies often steer clear of it because it demands video production, which is typically outside their operational scope, and because the learning curve is steeper than for Search campaigns.

If your product or service is better explained in video than in text, YouTube Ads should be in your mix. If your agency doesn't offer it, it's a real limitation, not a strategic choice.

Display and remarketing - re-engaging those who already know you

Display remarketing re-engages users who visited your website without converting. It's one of the channels offering the best cost per conversion when well-segmented, as you're targeting an audience already familiar with your brand. The common issue is overly broad segmentation: showing ads to anyone who has visited any page of your website, rather than segmenting by behaviour, time on page, or products viewed.

Warning signs - when your Google Ads agency is failing you

There are warning signs that are hard to ignore once you know them. The problem is that many advertisers don't know what to look for until they've already wasted months of budget. These are the clearest indicators.

They give you reports on impressions and CTR, not conversions and ROAS

A report focused on impressions and CTR without correlating it with actual conversions is an activity report, not a results report. Impressions don't pay the bills. Conversions do. If your monthly report doesn't include ROAS per campaign, cost per conversion, and the actual number of conversions, demand that they change it. If they can't or won't, it's a clear sign that they either don't have that data or aren't performing well.

You don't have access to your own Google Ads account

Your Google Ads account must be in your company's name, not the agency's. If the agency manages it from their own account and you only see the reports they generate, you have no real control over your investment. Should you switch agencies, you would lose all conversion history, audience data, and the algorithm's accumulated learning. This is a critical warning sign that allows for no excuses.

They can't explain what changes they made last week

An agency that actively manages an account should be able to tell you, at any given moment, what changes they made in the last seven days: which keywords they added or excluded, which creatives they rotated, what bid adjustments they applied, and why. If the response is vague or generic, the management is superficial. Request your account's change log. If it doesn't exist, the management isn't professional.

Your budget goes up but your ROAS doesn't improve

Increasing your budget without improving campaign structure, creatives, or segmentation only amplifies existing problems. If you've been increasing ad spend for months and your ROAS remains flat or drops, there's an optimisation issue, not a budget one. More money poured into a poorly structured campaign doesn't generate more conversions; it simply generates more expenditure.

How much does a Google Ads agency cost in Spain - real ranges 2026

Pricing is the topic agencies most often avoid on their websites. Here are the actual ranges for the Spanish market, along with their typical conditions.

Percentage-based model - ranges by agency size

The most prevalent model in Spain is a commission on ad spend. Small and medium-sized agencies typically apply between 10% and a minority percentage of the monthly investment, with a minimum fee regardless of the budget. Larger or specialised agencies may apply lower percentages for high-investment accounts, but they compensate with additional services that are charged separately.

The minimum fee is crucial: many agencies have a floor of between 300 and 500 euros per month, meaning that if your ad spend is low, the effective percentage you pay is higher than the nominal rate.

Fixed fee model - what it includes and what is charged separately

The fixed monthly fee decouples the agency's remuneration from the volume of investment. It's more predictable for the advertiser and more transparent in terms of incentives. What it typically includes: campaign management, bid optimisation, a monthly report, and customer support. What's usually charged separately: creative production, initial setup, landing pages, and management of additional channels.

Before comparing fixed fees across agencies, ensure you're comparing the same scope of service. An apparently low fee that doesn't include creatives could end up being more expensive than a higher fee that does.

Hybrid model - base fee + performance-based variable

The hybrid model combines a monthly base fee with a performance-linked variable, typically tied to ROAS or the number of conversions. In theory, this better aligns incentives: the agency earns more if your campaigns perform better. In practice, however, the definition of 'performance' and the activation thresholds for the variable are frequent points of contention. Read the contract carefully before signing.

Alternative to an agency: in-house management with specialised AI

Hiring an agency isn't the only option. For many small businesses, especially those with moderate budgets and in-house teams possessing some digital knowledge, automated AI management presents a genuine alternative, not merely an experiment.

What AI can automate in a Google Ads account

AI can automate continuous performance monitoring, real-time bid adjustments, anomaly detection (such as spending spikes, conversion drops, or keywords that skyrocket without converting), the generation of creative variants, and automated reporting with alerts. What it cannot automate, at least not completely, is the overarching strategy: which channels to prioritise, what value proposition to communicate, or how to structure the conversion funnel.

When it makes sense to manage without an agency (and when it doesn't)

Managing without an agency makes sense when: you have an in-house team with basic Google Ads knowledge, your monthly budget is sufficient to justify an automation tool but not a large agency, and you want full control over your account and data. It doesn't make sense when: you lack internal personnel who understand the metrics, your sector is highly competitive and demands advanced strategy, or you require video creative production that needs specialised resources.

Real case: from agency fees to fixed monthly fee - same ROAS, more control

The pattern observed in accounts migrating from traditional agencies to automated management is consistent: ROAS is maintained or improved, management costs drop significantly, and the advertiser regains access and control over their own account. The most valued change isn't typically the savings in fees, but rather the real-time visibility into what's happening with the budget. A dashboard updated every 15 minutes transforms the advertiser's relationship with their campaigns: shifting from relying on the agency's monthly report to making decisions with their own data.

Frequently asked questions about Google Ads agencies

What exactly does a Google Ads agency do?

A Google Ads agency designs, launches, and optimises advertising campaigns on Google's Search, Shopping, YouTube, and Display networks. It manages campaign structure, audience segmentation, bids, creatives, and conversion tracking, with the aim of maximising ROAS or minimising cost per lead within the agreed budget.

How much does a Google Ads agency charge in Spain?

The most common model in Spain is a 10-a minority percentage commission on monthly ad spend. There are alternative fixed monthly fee options that eliminate the commission and offer greater transparency for small businesses with medium-to-low ad spend. Consult directly with each agency to obtain their updated rates.

What is Google Partner Premier and what does it guarantee?

The Google Partner Premier badge identifies agencies that surpass minimum thresholds for managed ad spend, client retention, and manager certifications. It guarantees technical expertise validated by Google, but it doesn't assure ROAS results or transparency in reporting; both aspects must be evaluated separately.

Should I have access to my own Google Ads account?

Yes, always. The Google Ads account must be in the advertiser's name, not the agency's. If the agency manages it from its own account, switching providers would mean losing all conversion history, audience data, and accumulated campaign learning. This is a critical warning sign.

How long does a Google Ads campaign take to show results?

Well-structured Search campaigns typically show initial conversion data within the first few weeks. The Smart Bidding algorithm requires a minimum volume of conversions per ad group to optimise reliably. Advanced ROAS optimisation usually consolidates between weeks six and twelve, depending on the investment volume and the industry.

What is the difference between a Google Ads agency and managing campaigns with your own AI?

A traditional agency assigns a human manager who reviews campaigns two or three times a week and charges a commission on ad spend. An automated AI management system monitors and adjusts bids in real-time, generates more creative variants per month, and operates without commission or lengthy contracts, proving more efficient for small businesses with budgets up to 10,000 €/month.

What metrics should I demand from my Google Ads agency?

The priority metrics are: ROAS, cost per

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