The best digital marketing agency is not necessarily the largest or the cheapest. It is the one that best understands your business, has proven experience in your industry, and delivers measurable results. Choosing the wrong agency can mean months of wasted investment and missed opportunities to competitors. Choosing the right one can be the factor that accelerates your company’s growth over the coming years.
In this guide, the Webcomum team, a digital agency with more than 20 years of experience supporting Portuguese and international businesses, presents the eight key criteria you should use to evaluate any agency before signing a contract.
1. Portfolio and Case Studies with Real Results
The first filter is simple: can the agency demonstrate what it has already achieved? A portfolio supported by detailed case studies that outline the challenge, the strategy implemented, and the results achieved through concrete metrics (traffic, leads, conversion rate, ROI) is the most reliable indicator of genuine expertise.
Be cautious of agencies that only showcase attractive creative work without any performance context. In digital marketing, what matters is the impact on the client’s business, not simply the visual appeal of the campaigns.
Ask directly: “Do you have case studies from businesses similar to mine?” If the answer is vague or unsupported by evidence, consider it a warning sign.
2. Specialisation vs. Full-Service Expertise
Some agencies specialise in a single channel (SEO, Google Ads, or social media), while others offer a full-service approach that covers the entire digital strategy. Neither model is inherently better—it depends on your business needs.
If your company requires an integrated strategy where SEO supports content creation, paid campaigns accelerate results, and social media strengthens brand awareness, an agency with a 360-degree approach is often the better choice. If you have a very specific and focused requirement, a specialist agency may deliver greater efficiency.
The risk with agencies that claim to “do everything” without having the necessary resources is a lack of depth. They promise expertise across multiple areas but deliver only superficial results. Always ask who will be carrying out the work and what relevant experience that person has.
3. Transparency in Reporting and Account Access
A professional agency gives you full access to your own Google Ads, Google Analytics, and Meta Ads Manager accounts, while providing regular reports that clearly explain what has been done, what has worked, and what will be adjusted moving forward.
If an agency refuses to grant access to your accounts or presents reports focused on vanity metrics such as impressions, reach, or followers without linking them to business outcomes, it may be withholding information that rightfully belongs to you.
At Webcomum, all accounts belong to the client. If the commercial relationship comes to an end, the client retains full ownership of the account history, data, and configurations—never becoming dependent on the agency.
4. Methodology and Working Process
How an agency works is just as important as what it delivers. Before making a decision, make sure you understand:
How is the onboarding process conducted?
Is there an audit and diagnostic phase before any work begins?
How are objectives and KPIs defined?
How often are progress and review meetings held?
Who will be your main point of contact?
An agency with a structured process that starts by understanding the business before taking action will produce very different results from one that launches campaigns in the first week without any prior strategic analysis.
5. Multidisciplinary Team and Senior Expertise
Digital marketing requires a wide range of specialised skills, including content strategy, technical SEO, paid advertising management, design, copywriting, data analysis, and web development. It is highly unlikely that one or two people can master all of these areas with the depth required to deliver outstanding results.
Ask about the composition of the team. How many people will be working on your account? What experience does each person have? Is a senior strategist involved in the project, or is the work delegated to junior team members without proper supervision?
Webcomum has a multidisciplinary team of specialists, with dedicated professionals in each area. This allows us to deliver an integrated strategy without compromising technical depth or expertise across any channel.
6. Understanding of the Portuguese Market
The Portuguese digital market has specific characteristics that an agency focused solely on international benchmarks may not fully understand. These include the search behaviour of Portuguese consumers, the most competitive industries, actual cost-per-click rates in Portugal, the platforms with the highest adoption across different age groups, and the seasonal patterns that affect each sector.
An agency with a proven track record in Portugal, working with Portuguese clients, analysing Portuguese market data, and supported by a team that understands the local business environment, has a genuine competitive advantage over agencies that apply generic strategies without local context.
7. Ability to Grow with Your Business
The relationship with a digital marketing agency should ideally be a long-term partnership. An agency that successfully supports an SME with 10 employees should also have the capability to support that business as it grows to 50, 100, or more employees.
Assess whether the agency has experience working with businesses at different stages of growth, whether it can manage larger budgets without compromising quality, and whether the team has the depth and expertise required to scale its services as your needs evolve.
Questions to Ask During Your First Meeting with a Digital Marketing Agency
Before moving forward with a proposal, use the following questions to evaluate the agency:
What specific results have you achieved for clients in my industry?
Who will manage my account on a day-to-day basis?
How do you measure the success of your campaigns?
Will I have full access to my accounts and data?
What happens to the accounts and historical data if we end our partnership?
What is the minimum contract term and what are the termination conditions?
The answers to these questions reveal far more about an agency’s professionalism and transparency than any sales presentation ever will.
Red Flags to Avoid
There are several warning signs that should immediately make you reconsider moving forward with an agency:
Guarantees of specific results, such as “we guarantee the number one position on Google” — no reputable agency can make such promises.
Lack of access to your own advertising accounts.
Reports focused on vanity metrics, such as likes, reach, or impressions, without linking them to business outcomes.
Proposals that do not include an initial audit or diagnostic phase.
Contracts with excessively long minimum terms and no performance-based exit clauses.
No case studies, client references, or verifiable proof of past results.
These warning signs often indicate a lack of transparency, unrealistic expectations, or an approach that prioritises sales over long-term client success.
Frequently Asked Questions
Should I choose a local agency, or can it be based in another city? Location matters less than ever in a remote-working environment. What really matters is communication, availability, and strategic alignment. That said, an agency with experience and knowledge of the Portuguese market—regardless of its city—has a clear advantage over foreign agencies that lack local context.
What is the difference between a digital marketing agency and a freelancer? A freelancer is typically more specialised in a specific area and often more cost-effective. An agency provides a multidisciplinary team, more structured processes, and greater scalability—but usually at a higher cost. For integrated digital marketing strategies, an agency is generally the more suitable option.
How long should I commit to working with an agency? Digital marketing takes time to deliver meaningful results, particularly SEO and campaigns that require a learning phase. A minimum commitment of six months is reasonable for evaluating performance properly. Be cautious of agencies that require 12- or 24-month contracts without performance-based exit clauses.
How do I know if the agency is doing a good job? The answer lies in KPIs agreed upon before the work begins: cost per lead, conversion rate, organic traffic growth, keyword rankings, and return on investment from paid campaigns. If there are no clearly defined objectives from the outset, it becomes impossible to assess performance objectively.
Conclusion: The Right Agency Is a Strategic Decision
Choosing a digital marketing agency is not an operational decision, it is a strategic one that can influence the growth of your business for months or even years. It is worth investing time in the selection process, asking the right questions, and demanding clear evidence of results before making a commitment.
At Webcomum, we believe the best way to demonstrate what we do is to show what we have already achieved. If you would like to understand how we can help your business grow online, schedule a no-obligation meeting with our team and receive an initial analysis of your business.