Outsourcing Link Building to an Agency: What Should You Look For?

Quick summary

For professional services firms, outsourcing link building to an agency can be one of the quickest ways to build authority in Google. However, choosing the wrong agency can cost far more than it delivers. The essentials are simple: always ask how links are sourced and vetted, make sure sponsored placements are labelled correctly, and retain ownership of your link building strategy rather than becoming dependent on a single external provider. Google treats links created primarily to manipulate rankings as link spam, and that definition should shape every contract you sign. Addressing these points upfront can save you from a costly cleanup later.

Key takeaways

• Google explicitly defines buying or selling links for ranking purposes as link spam, and enforces this through Google Search Central's spam policies.
• Sponsored placements and guest posts that pass link value must be properly qualified using rel="sponsored" or nofollow, as explained in Google's link spam update.
• The Dutch Advertising Code requires commercial communications, including sponsored content used in link building, to be clearly recognisable as advertising, according to the Dutch Advertising Code Authority.
• ACM guidance requires every form of sponsored content to make clear who is paying for it. This directly affects paid link placements made on behalf of clients. See Thuiswinkel.org's explanation of the ACM guidelines.
• The Dutch advertising industry grew by 1,6 percent in 2025, after growth of 7,2 percent in 2024. With more agencies operating in this space, careful supplier selection matters more than ever, according to Searchlab, based on CBS data.

What does outsourcing link building to an agency actually involve?

When a professional services business, such as a law firm, accountancy practice, or consulting firm, outsources link building, it hands responsibility for earning external links to its website to a third party. The agency may approach editors, write guest articles, negotiate brand mentions, and build relationships with other websites.

The challenge many marketing managers face is not the concept itself, but how it is delivered. An agency offering link building for a fixed monthly fee may work in two very different ways: through genuine editorial relationships, or through networks of paid placements that could be hit by a future Google update. From the outside, both offers can look almost identical, right down to reports showing "domain rating" and "new backlinks per month".

This matters especially to professional services firms, where trust and reputation are central to the business. A link profile later identified as manipulative can damage not only rankings, but the brand's credibility too.

How can you spot a risky link building offer?

The first question to ask any link building agency is this: how are the links obtained, and how is the agency paid?

Warning signs that deserve closer scrutiny

• Guaranteed volumes with no clear rationale. A promise of "20 links per month guaranteed" should raise concerns. High quality link building depends on editorial approval, not a production line.
• No visibility into target websites. Always ask for a sample list of websites where placements may appear. An agency that cannot or will not share this may be concealing a network of low quality sites.
• No disclosure of sponsorship. Under Google's own guidance, sponsored links must be labelled. An agency that ignores this exposes your brand to manual actions.
• No contractual transparency about link sources. The Dutch Advertising Code requires commercial content to be clearly identifiable as advertising. Unlabelled paid placements may therefore create legal risk as well, as explained by the Dutch Advertising Code Authority.

A useful rule of thumb: if an agency cannot explain why a particular website would link to you without payment for the placement itself, there is a good chance it is a paid arrangement that should be disclosed.

How to put this into practice:

1. Ask for three recent examples of live links, including the full URL.
2. Check whether those links use rel="sponsored" or rel="nofollow" where appropriate.
3. Ask directly: "Do you pay for placements, and if so, is that disclosed to the editorial team of the publishing website?"
4. Include a contract clause making the agency liable if its link profile leads to a Google manual action.

What contract terms should be included?

A strong outsourced link building contract should cover more than price and volume. It should define ownership of relationships, what happens after an algorithm update, and how transparency will be maintained.

Ownership of the link building strategy

If the agency ends the engagement, you as the client should know which websites were approached and on what terms. Without that documentation, you must start from scratch with a new provider. Worse still, you may not know which links could become a problem later.

Reporting on quality, not just quantity

Ask for reports that show more than the number of new links. They should also explain how relevant each referring website is to your field. For an accountancy firm, a link from a respected finance publication is more valuable than ten links from generic content farms, regardless of what a "domain rating" metric might suggest.

Liability and exit clauses

Set out what happens if Google applies a manual action that can be traced to the link profile built by the agency. A serious provider will be willing to discuss this risk and include it in the contract. An agency that avoids the subject is sending a message of its own.

How does link building fit into a broader content strategy for professional services?

Link building works best as the final piece of a content strategy, not as a substitute for one. A law firm or consultancy that focuses on links without publishing genuinely useful content has built its strategy on shaky ground. Editors and trade publications link to content with real authority: in depth analysis, specific data, and practical examples.

This is closely tied to the fact that content needs vary by industry. What works for an ecommerce business will not automatically work for a legal or financial services provider, as explained in What is SEO by industry and why doesn't one approach work for everyone?. Outsourcing link building without this industry specific foundation will usually deliver less value, no matter how capable the agency may be.

Agencies that provide marketing services to their own clients and want to buy link building on their behalf should first explore Launchmind for Marketing Agencies. It connects content production and visibility, rather than treating link building as a disconnected service that does not support the wider strategy.

What happens when you get it wrong? A hypothetical scenario

Example: a common agency scenario

Imagine a mid sized consultancy outsourcing link building to an external agency, aiming to rank higher for a range of service related search terms within a quarter. Each month, the agency sends a report showing more backlinks and a rising "domain authority" score. Over time, it becomes clear that some of those links come from websites with little topical relevance and no clear disclosure of the commercial relationship.

When Google releases a link spam focused update, as described in Google's spam policies, the consultancy loses positions it had earned through organic content. Recovery takes months: cleaning up the link profile, submitting a disavow file, and rebuilding trust with Google. Exact figures vary by case, but in practice, the extended loss of visibility is clearly measurable.

This example is illustrative and does not represent a specific client. However, the pattern will be familiar to anyone who ignores the warning signs above.

What can carefully managed outsourced link building deliver?

When the right safeguards are in place, the outcome looks very different. Thoughtful link building, supported by relevant content, gradually builds authority in your field. For professional services firms, that often means greater visibility for searches made just before a buying decision, such as "professional liability lawyer Rotterdam" or "hire an interim CFO".

The growth of the Dutch advertising and marketing market, which generated revenue of 12,363 billion euros in the advertising and market research sector in 2024 according to Searchlab, shows that more budget is becoming available for these services. At the same time, the Dutch digital advertising market grew from 2,255 billion to 4,761 billion euros since 2019, according to Fonk Magazine, based on IAB Europe data. More budget also means more providers, which makes careful selection even more important.

What can agencies learn from unsuccessful link building campaigns?

The most important lesson is that speed and volume are the wrong metrics. An agency promising dozens of links within four weeks should be able to explain how it achieves that without compromising on quality or transparency.

A second lesson is to connect link building to ongoing content production, rather than isolated projects that end when the contract does. Content that is regularly updated and expanded gives link building partners something worthwhile to reference. That is why some professional services firms combine link building with a continuing subscription to SEO articles. This ensures there is always current, relevant content to serve as a destination for external links, rather than a one off campaign pointing to an outdated page.

Finally, agree in advance on how any Google manual action will be handled. This should not be a formality, but a clear contractual process that specifies who pays for the cleanup.

Frequently asked questions

How much does it cost to outsource link building to an agency?

Pricing varies widely by agency and by the quality of the intended placements. It generally increases when target websites are more relevant and authoritative in your field. Always ask for a breakdown of the agency's management fees and the actual placement costs, so you understand exactly where your budget goes.

How quickly will I see results from outsourced link building?

Link building is usually slow because it depends on third party editorial processes and how quickly Google discovers, indexes, and evaluates new links. Promises of high volumes in just a few weeks are a reason to look more closely at where those links are coming from.

Is outsourcing link building always risky in Google's view?

Not necessarily. Google does not prohibit using a third party to earn links, but it does treat links created primarily to manipulate rankings as link spam. The risk lies in the method, not in outsourcing itself.

Does a sponsored mention always need to be labelled?

Yes. Sponsored content and paid placements must be clearly recognisable to the public as advertising, as set out in the Dutch Advertising Code. Any link value passed through paid placements must also be technically qualified under Google's guidelines.

How does Launchmind support a safe link building strategy?

Launchmind does not build external links itself. Instead, it creates the underlying content that link building partners can reference: articles refined using real Search Console data and hub and spoke content clusters that cover a topic comprehensively. This gives a link building agency current, relevant pages worth linking to, rather than outdated content that fails to make a compelling case.

Conclusion

Outsourcing link building to an agency can deliver visibility that organic content alone may not achieve, but only when the terms are clearly defined from the start. Ask where links come from, check that sponsored placements are properly labelled, and keep control of the strategy even if the relationship eventually ends. Skip these steps, and a short term ranking gain can turn into a lengthy recovery project.

Want to make sure the content your links point to is strong enough to earn authority in its own right? Book a free consultation to discuss how an ongoing content strategy and link building can strengthen each other.

About the company

Launchmind is the AI colleague that writes, reviews, and publishes SEO content on your own blog every day, in 8 languages, while continuously improving based on real Search Console data. Alex also improves your service pages with a direct answer, price guidance, your approach, proof points, and questions from real customers. Launchmind is built for marketing managers, business owners, and marketing leaders at small and medium-sized businesses and scaleups who know content works but struggle to produce it consistently.