# How to choose a digital marketing agency

> Choosing an agency means choosing a partner. Here are the signs of a good one, the red flags, and the real pros and cons versus an in-house team.

_Author: Jhon Michael Garcia · Published: 2026-07-23 · Updated: 2026-08-01 · Web version: https://cruslar.com/blog/how-to-choose-a-digital-marketing-agency_

Choosing a digital marketing agency means choosing a partner, not just a supplier: a big part of where your brand ends up depends on that decision. This article covers what a good agency actually does, which red flags to avoid, and the real pros and cons of working with one versus building the team in-house.

## What does a digital marketing agency actually do?

An agency combines SEO, advertising, content, social media and sometimes web development under a single strategy, instead of you hiring each piece separately and hoping they line up on their own. The point is getting every channel pulling toward your business goals, not toward disconnected metrics.

## Why the choice matters so much

Pick the wrong agency and it costs real money: months of campaigns with no clear return, ad accounts you can't access, reports that don't tell you anything you can act on. Pick the right one, and every pound or dollar invested can be traced back to an actual result.

## Pros and cons of working with an agency

Before signing with anyone, it's worth comparing the real alternative: hiring an agency or building the team in-house. Neither option is better in the abstract — it depends on how much you can invest and how much day-to-day control you want.

| Factor | External agency | In-house team |
| --- | --- | --- |
| Starting cost | Lower, you pay per service | High: salaries and tools |
| Multichannel knowledge | Broad, already there | Depends who you hire |
| Time to get going | Fast, already running | Slow, the team needs training |
| Day-to-day control | Lower, via meetings | Full, they're in your office |
| Scaling with growth | Easy, adjust the hours | Requires hiring more people |

The agency wins on speed and existing know-how; the in-house team wins on daily control. Plenty of growing businesses end up in the middle: an agency that runs the strategy and one internal person who acts as the bridge.

## Signs of a good agency

- **They talk about results, not "likes".** Sales, leads and return, not just followers.
- **They're transparent.** You see your accounts, your data and where every pound or dollar goes.
- **They ask about your business** before proposing anything. Without understanding your customer, any plan is generic.
- **They combine strategy and technology.** Marketing and the website pull in the same direction.
- **They explain the why** behind every decision, not just the what. If they can't justify a campaign, they shouldn't be running it.
- **They have checkable references.** Real cases you can look into, not loose screenshots.

## Red flags

**Idea:** if an agency promises something no one can actually guarantee, that's not optimism — it's selling smoke.

- Promises of "number one on Google in a week".
- Fixed packages sold before they've asked you anything.
- Contracts that tie your ad accounts or your domain to their name, not yours.
- They only show you nice screenshots, never the raw data.
- They change strategy without telling you or explaining why.

## What type of agency fits your business stage

- **If you're starting out or still validating:** a freelancer or a small specialised agency is usually enough. It's cheaper, more agile, and doesn't lock you into a long commitment while you're still testing what works.
- **If you're already generating revenue and have your own processes:** that's where an agency with a multidisciplinary team pays off, one that can coordinate SEO, advertising, content and development at once, with proper reporting. A small agency starts falling short once the business is growing on several fronts at the same time.

## What we see at Cruslar

In [digital marketing](https://cruslar.com/services/marketing-digital) we always start by understanding the business before proposing anything. That's what we did, for example, in the marketing audit, technical SEO and UX work for [Bintal](https://cruslar.com/portfolios/bintal): before touching a single campaign, we reviewed what was actually going wrong.

## What to ask before you sign

- Who's actually going to run my account day to day, and can I talk to that person before signing?
- What access will I have to my own accounts and data at all times?
- How do they measure whether a campaign is working, and how often do they tell you?
- What happens if I want to leave in six months? Do I keep my accounts and my data?

## Frequently asked questions

### How much does it cost to hire a digital marketing agency?

It varies a lot depending on scope: managing one campaign isn't the same as running SEO, advertising and content together. Be wary of any fixed number quoted before they've asked about your business.

### Do I need an agency if I already have an in-house marketer?

It depends on how many channels that one person is covering alone. It's common to combine both: someone in-house who knows the business in detail, and an agency that brings the specialised team that would be expensive to hire outright.

### How long does it take to see results?

With advertising, weeks. With SEO and content, months: those are channels that build on what came before, not ones that start from zero every time.

### Can I switch agencies if it isn't working?

You should be able to, without losing your accounts or your data. If the contract doesn't make that clear, that's a red flag in itself.

### What's the difference between a generalist and a specialised agency?

A generalist covers several channels with a smaller team; a specialist goes much deeper into just one (SEO, advertising, content). For a business that needs several fronts coordinated at once, the generalist is usually more practical; if the challenge is concentrated in one channel, the specialist pays off.

## Want more customers, not just more noise?

In [digital marketing](https://cruslar.com/services/marketing-digital) we start from your goals and measure what matters, with clear monthly reports. [Let's talk](https://cruslar.com/contact) about your business.