Google Ads Agency: Outsource or Manage It In-House

Table of contents

• Outsourcing Google Ads campaigns: the real debate for small businesses
• What does a Google Ads agency really cost?
• At what budget does a Google Ads agency become worth it?
• The 3 KPIs to demand before signing (and the brand-budget trap)
• When data-driven in-house management works (and when it fails)
• Agency or in-house: the decision framework
• Keeping control of your Ads data with Lysible
• Frequently asked questions

Outsourcing Google Ads campaigns: the real debate for small businesses

The real debate isn't "agency or no agency," it's "at what spend level does outside expertise cover its own cost." Most content you'll find on this topic carefully avoids that question. That makes sense: it's written on agency sales pages.

A Google Ads agency handles your paid search (SEA) on Google's advertising ecosystem. In practice, it structures your campaigns, writes your ads, manages your bids, and sends you a monthly report. That's useful work. But it has a price, added on top of every click you're already paying Google for.

The reflex most missing among the business owners I meet is calculating total cost. They compare the agency fee to zero, when they should compare it to what tooled-up in-house management would really cost them. That difference changes the entire calculation.

What does a Google Ads agency actually do day to day?

An agency creates and optimizes your Search, Shopping, and Performance Max campaigns, adjusts your bids, and produces monthly ad reporting. The real day-to-day work: watching for keywords that burn budget without converting, testing ad variants, excluding irrelevant search terms, and calibrating automated bidding strategies.

On a small Search account, once the structure is in place, this work rarely takes more than two to four hours a week. That gap between the actual workload and the fee charged is what creates the gray area. The simpler the account, the less an agency justifies itself economically.

Why the top Google results won't help you decide

The top results for this question are agency showcases, never neutral analyses. An agency writing an article titled "do you need a Google Ads agency" will always conclude yes: that's its business model.

So you won't find, in those pages, the budget threshold where outsourcing eats into your margin. Nor the brand-budget trap. Nor a framework for calculating your own break-even point. That's precisely the gap this article fills, with real numbers and a method you can apply as soon as next week.

What does a Google Ads agency really cost?

A Google Ads agency most often charges between 15 and 25% of your media budget, or a flat monthly fee of €600-2,500, sometimes both combined. This cost is added on top of the budget you're already paying Google for your clicks.

This double billing is the first thing many business owners underestimate. If you spend €1,500 in media budget and pay 20% to an agency, your real acquisition cost climbs by €300 a month. Over a year, that's €3,600 that doesn't fund a single extra click.

Flat fee, percentage, or performance: which pricing model?

Three billing models coexist, and each shifts risk differently. The flat fee protects your budget but removes any accountability from the agency on performance. The percentage model incentivizes it to grow your spend, not necessarily your profits. The performance model aligns interests, but it stays rare on small accounts.

Be wary of a percentage model on its own. An agency paid this way earns more if you spend more, not if you profit more. The tension is structural, and it rarely works in your favor.

What hidden costs get added to the media budget?

Beyond the visible fee, count the initial setup costs (often €500-1,500), the price of reporting tools, and the internal time spent in meetings and approvals. These items frequently add 10-20% on top of the quoted rate.

I audited a mid-sized e-commerce small business's account in early 2025: the true total cost of its agency reached €1,900 a month, while the contract stated €1,200. The gap came from internal hours spent and a reporting tool billed on top with a markup. To stay on top of these numbers, a well-structured Google Analytics dashboard remains your best safeguard.

At what budget does a Google Ads agency become worth it?

Below roughly €2,000 in monthly media budget, a Google Ads agency often destroys more value than it creates. Above €3,000, its value added starts to clearly outweigh its cost. In between lies a gray area that depends heavily on your margin.

The reasoning is straightforward. An agency charging a €600 minimum needs to generate at least €600 in extra profit just to break even. On a €1,500 budget, that means it has to improve your performance by 40%. That's rare, even with an excellent provider, because the room for optimization on a small account is mechanically limited.

The media budget threshold that changes everything

The tipping point sits where the performance gain an agency brings exceeds its total cost. For most small businesses I observe, that threshold hovers around €2,000-3,000 in monthly media spend.

Why that specific level? Below it, conversion volume is too low for Google's automated bidding to learn quickly. The official Google Ads help center on bidding strategies recommends at least 15 to 30 conversions over 30 days for an algorithm to stabilize. Under €2,000, many accounts never get there, agency or not.

How do you calculate your break-even point?

Your break-even point is calculated by comparing net profit with an agency to net profit with in-house management, over the same period. The formula fits on one line: net profit = (conversions x unit margin) minus media budget minus agency or tooling cost.

Take your current numbers. Realistically estimate the gain an agency would bring (10-25% is credible, 50% is a fantasy). If the profit gain exceeds the agency's cost, outsource. If not, keep control and get the right tools. This calculation takes ten minutes and settles the question better than any sales pitch.

Lysible runs this calculation continuously for you, profit gain against cost, so you can decide without pulling out a calculator every quarter.

The 3 KPIs to demand before signing (and the brand-budget trap)

Before signing with a Google Ads agency, demand three metrics: net ROAS excluding agency fees, real cost per conversion, and the share of budget spent on your own brand. Without these three numbers, you're flying blind.

ROAS (return on ad spend, the revenue generated per €1 spent on advertising) is the king metric of paid search. But the gross ROAS an agency shows you nearly always lies, for a specific reason I detail just below. To go deeper on the method, our article on managing Google Ads ROI with data covers the connections to make with GA4.

Net ROAS: why gross figures lie

Gross ROAS adds up all the revenue attributed to advertising without deducting agency fees, which mechanically overstates real profitability. Net ROAS, on the other hand, strips out the agency's cost and hidden fees.

Here's a telling example. An agency reports a ROAS of 5: €1,500 in media spend for €7,500 in revenue. Impressive on paper. Add €400 in agency fees and €600 in product cost, and your real profit shrinks fast. Always think in net terms. Gross is a brochure number, not a management one.

How do you spot an agency inflating its results?

An agency inflates its ROAS when it captures clicks on your own brand name, sales you would have made without any advertising. This is the brand-budget trap, the most common one and the least talked about.

Here's how it works. Someone searches your company name on Google, sees your ad, clicks, and buys. The agency counts that sale as an advertising win. But that customer was already coming to you. I've seen accounts where brand spend exceeded 40% of total ad spend, artificially inflating overall ROAS in a dramatic way.

Always ask for the brand vs. non-brand breakdown. A good agency hands it over without hesitation. A bad one dodges the question. A ROAS of 8 on brand and 2 on non-brand tells a very different story than an overall ROAS of 5.

When data-driven in-house management works (and when it fails)

In-house management works when your account is simple, your budget modest, and your margin solid. It fails when technical complexity outpaces your available time. Four variables decide it: media budget, product margin, in-house time, and account complexity.

I've watched small businesses run a €1,200-a-month Search account better than an agency, simply because they knew their product and margins better than any outside provider. On the flip side, I've also seen Performance Max and Shopping accounts spiral out of control for lack of in-house skill. Both situations exist, and they depend less on budget than on how the account is set up.

Which businesses succeed managing it in-house?

Small businesses that succeed in-house have a simple Search account, a clear offer, and one person able to give it two to four hours a week. This profile covers a large share of service-based small businesses and niche e-commerce.

If you sell a limited number of products or services, with a short buying cycle and a well-controlled funnel, you don't need an agency to manage ten ad groups. Free tools are enough: Google Ads Editor for bulk changes, Google Analytics 4 for conversion tracking. Measuring your conversions properly starts with knowing how to read your Google Analytics reports without drowning in data.

Which accounts are too complex to keep in-house?

An account becomes too complex for in-house management when it combines Performance Max, Shopping, and a large catalog, with a product feed to maintain. At that point, management time explodes and technical expertise becomes critical.

Performance Max (Google's automated campaign type that runs across all its networks at once) is a black box that requires experience to avoid wasting budget. A poorly structured Shopping feed can tank your quality score, and your average CPC shoots up. That's where an agency or a specialized consultant genuinely earns its keep. My analysis on the real profitability of a Google Ads consultant spells out the thresholds to remember.

Agency or in-house: the decision framework

To decide, cross your four variables in a simple grid: under €2,000 in media spend with a simple Search account, stay in-house. Above €3,000 with a complex account, outsource. In between, run a 90-day test before committing.

Here's a real case I worked on last year. A twelve-person e-commerce business was spending €1,800 in media and €450 in agency fees a month, for a net ROAS of 2.1. After taking back control, cleaning up brand spend, and reallocating toward non-brand, its cost per conversion dropped 22% in three months. Net ROAS climbed to 2.9. No agency, just rigorous tracking of the right metrics.

What's the best Google Ads agency for your situation?

The best Google Ads agency for your situation is the one willing to show you a net ROAS split between brand and non-brand, and to frame a measured test. The agency's name matters less than its transparency about the numbers.

Large agencies like Eskimoz or Junto bring real expertise, but their business model rarely targets budgets under €3,000. For a small business, an independent certified consultant is often cheaper and more accessible. Never choose based on name recognition alone.

How do you frame a 90-day test before committing?

Frame a 90-day test by setting three measured KPIs in advance (net ROAS, cost per conversion, brand share), a clear baseline, and a written success threshold. Without a baseline before the engagement starts, you'll never be able to judge it.

Measure your current numbers for a month. Start the engagement. Compare at 90 days. If the agency doesn't improve your net profit beyond its cost, you walk away with no regrets. This framework protects your budget and quickly reveals the serious providers. To properly track sales attribution, the method in linking each conversion to its acquisition channel will help you avoid blind spots.

Keeping control of your Ads data with Lysible

Deciding between an agency and in-house management means having your real numbers in front of you, not the ones from a sales deck. That's exactly the problem Lysible solves: centralizing your Google Ads, Analytics, and Search Console data to calculate your net ROAS, isolate brand spend, and spot overstated conversions. For the e-commerce small businesses we work with, this control changes the whole calculus: you know whether an agency is genuinely creating value or billing you for work you could handle yourself. Whether you outsource or not, keeping control of your data remains the best protection against dressed-up reports. The Google Partners program guarantees nothing on that front.