Google Ads Agency: What it does and what it costs

Companies that place Google Ads achieve an average 200% ROI on every euro invested – provided the campaigns are professionally set up and continuously optimized. This is precisely the core business of a Google Ads agency: it takes care of strategy, setup, texts, bids and evaluation so that you can concentrate on your business.

Key Facts -

What a Google Ads agency actually does

The most important Google Ads campaign types at a glance

What does a Google Ads agency cost?

Monthly flat rate

Percentage model

Hybrid model

Typical total costs at a glance

How to recognize a good Google Ads agency

Positive signals

Warning signals

The collaboration: This is how a typical mandate works

Phase 1: Onboarding and audit (weeks 1-2)

Phase 2: Setup and launch (weeks 3-4)

Phase 3: Optimization (ongoing)

Google Ads agency vs. in-house: Which is right for you?

What a Google Ads agency actually does

A Google Ads agency is not an extension of your marketing team that places ads while you watch. It thinks in terms of funnels, target groups and margins. From the first keyword research sprint to the monthly performance review, it delivers everything from a single source.

Keyword research and competition analysis before campaign launch
Account architecture: campaigns, ad groups, bidding strategies
Ad texts and creatives (Search, Display, YouTube, Performance Max)
Conversion tracking setup: Google Tag, GA4, Enhanced Conversions
Ongoing bid management and budget optimization
Monthly reporting with ROAS, CPA and impression share

The decisive difference to internal ad management: agencies usually manage dozens of accounts at the same time. They see patterns, mistakes and opportunities that remain hidden to a single advertiser. This network knowledge flows into every account they manage.

The most important Google Ads campaign types at a glance

Which campaign is best suited to your company depends on the objective, product and budget. The following table shows the most common types with typical suitability, sensible starting budget and realistic ROAS expectations:

Campaign type	Suitability	Budget (monthly)	ROAS expectation
Search (search network)	Direct purchase intent, B2B leads, local service providers	from 500 €	200-600 %
Display	Brand awareness, remarketing, broad audience	from 300 €	100-250 %
Shopping	E-Commerce, Product Catalogs, Price Comparison	from 800 €	300-800 %
YouTube	Explanatory products, brand building, demo videos	from € 1,000	150-400 %
Performance Max	Scaling across all channels, e-commerce with feed	from € 1,500	250-700 %

Agency tip: Never start with Performance Max before search campaigns deliver at least 30 conversions per month. PMax needs signals – without them it burns budget in the display network without a measurable return.

What does a Google Ads agency cost?

The cost issue is complex because agencies use different pricing models. There are basically three common models: a monthly flat rate, a percentage of the managed advertising budget or a hybrid model of both.

Monthly flat rate

Small and medium-sized agencies often charge a flat rate of between €500 and €3,000 per month, depending on the scope of services. This model creates planning security on both sides. The disadvantage: if the budget increases, the agency’s performance does not automatically increase with it.

Percentage model

The most common model for larger budgets: The agency receives 10-20% of the monthly ad spend managed. So with a €10,000 ad budget, the client pays a €1,000-2,000 agency fee. There is a natural incentive to scale the budget – which is sometimes contrary to your interests if the ROAS is not right.

Hybrid model

Many agencies combine a basic flat rate (e.g. €800) with a performance share. This creates alignment: the agency only benefits more when you also benefit. This model is recommended for long-term partnerships with clear KPI targets.

Typical total costs at a glance

Small budget (up to 2,000 €/month ad spend): Flat fee 500-800 € + advertising budget
Medium budget (€ 2,000-10,000): 15 % of the budget, at least € 800
Large budget (over €10,000): 10-12 % degressive scale + setup fee
Setup fee (initial setup): 500-2,000 €, one-off

How to recognize a good Google Ads agency

The market is full of agencies that display Google Partner badges but have little behind them. The partner badge is only an entry indicator – the questions you ask in the initial interview and the answers you get are crucial.

Positive signals

The agency asks about your margins, not just your budget
She talks about CPA and ROAS targets before she talks about click numbers
It shows you anonymized case studies from your industry
Tracking is the first thing you check and set up
Monthly calls with concrete recommendations for action, not just PDFs of figures

Warning signals

Guaranteed click or conversion figures without knowledge of your market
No questions about your target groups or competitors
Reporting exclusively via Google’s own metrics without reference to turnover
Long-term contracts with a minimum term of 12+ months for the first commitment

The collaboration: This is how a typical mandate works

A professional Google Ads agency works in clearly defined phases. Anyone who doesn’t do this is improvising at your expense.

Phase 1: Onboarding and audit (weeks 1-2)

Before a single ad is changed, the agency analyzes the existing account, the tracking architecture and the conversion data. If there is no account yet, a competitive and keyword research follows. The result is a prioritized roadmap.

Phase 2: Setup and launch (weeks 3-4)

Set up campaign architecture, write ad texts, configure ad extensions, define bidding strategies. Initial expenditure is deliberately kept low in order to collect clean data.

Phase 3: Optimization (ongoing)

Weekly checks for search terms, quality factors, bid changes and budget utilization. Monthly A/B tests on ad texts and landing pages. Quarterly strategy review with you as the client.

If you want to know how performance marketing affects ROAS and conversion rates, you can find more in-depth insights in our performance marketing and ROAS strategy for companies.

Google Ads agency vs. in-house: Which is right for you?

This question arises at the latest when the advertising budget reaches six figures. The answer depends on three factors: Budget, complexity and internal know-how.

Agency makes sense: budget under €50,000/month, no internal PPC team, several campaign types simultaneously, seasonal fluctuations, rapid scaling required
In-house makes sense: Highly repetitive campaigns with little variance, very high budget with scope for a dedicated team, strict data protection requirements that prohibit external account access
Hybrid: in-house manager coordinates external specialists for Shopping, YouTube or Performance Max – the best solution for many medium-sized e-commerce businesses

In addition to Google Ads, it is worth taking a look at SEO and SEA in combination – organic visibility and paid advertising reinforce each other considerably.

If you are also considering social ads, our overview of Facebook Ads agencies will help you make a comparison. You should also assess agency prices realistically – our page on social media agency prices will give you some orientation. For a personal introduction, we recommend an initial meeting without obligation.

What does a Google Ads agency cost per month?: Depending on the model, the costs range from €500 (flat fee for small accounts) to several thousand euros for large budgets. Typically 10-20% of the managed advertising budget, but at least €800-1,000 per month. In addition, there is the actual advertising budget and possibly a one-off setup fee of €500-2,000.
How long does it take for Google Ads to produce results?: The first clicks come the day after the launch. It takes 4-8 weeks for statistically significant conversion data and the first optimization rounds. A stable, profitable ROAS is usually achieved after 3-6 months if tracking and account architecture have been set up correctly from the outset.
Do I keep access to my own Google Ads account?: Yes, absolutely. You should always have admin access to your own account – regardless of which agency you hire. Reputable agencies work via Google Ads Manager account access without taking over your account. Ask for this in writing in the contract.
What is the difference between Google Ads and SEO?: Google Ads provides immediate visibility for a fee. Every click costs money, but the ads appear immediately on page 1. SEO is an organic process that takes 6-18 months, but then brings permanent traffic without direct click costs. Both complement each other: Ads provide quick data for SEO decisions, SEO reduces the dependency on paid traffic in the long term.
Can a Google Ads agency also manage Shopping campaigns for my online store?: Yes, Shopping campaigns and Performance Max with product feed are core disciplines of modern Google Ads agencies. A cleanly structured Merchant Center feed with complete product data, prices and availability is a prerequisite. The agency usually also takes on feed optimization as part of its service.