Links are still one of the ways search engines judge whether a page deserves to rank, which is why an entire industry exists to sell them, and why a large part of that industry sells something that carries risk rather than value. For a buyer the problem is that a good link programme and a bad one look identical in a proposal: both promise a monthly number of placements on sites with impressive-sounding metrics. The difference is in how the links are obtained and whether money changed hands for the link itself. This guide explains how link building fits into a wider search programme, which practices Google's own spam policies treat as violations, what genuinely earns links, and the questions that expose a risky vendor before you sign.
Where links sit in a search programme
Links are rarely the first constraint. Most sites that are underperforming are held back by something cheaper to fix: pages that do not exist for the queries the business wants, thin or duplicated content, slow mobile performance, or an internal linking structure that buries the important pages several clicks deep. Buying links to a page that does not answer the query will not make it rank, and buying links to a site with a technical problem is paying to amplify a signal that cannot be read properly. The sensible order is to fix the technical foundation, publish pages that genuinely deserve to rank, strengthen internal linking so authority reaches the pages that matter, and only then invest in external links for the competitive terms where every credible competitor already has them. A provider who leads with a link package before looking at your site is selling inventory rather than diagnosing a problem.
What Google's spam policies actually say about links
Google's spam policies for web search describe link spam as any behaviour intended to manipulate rankings, and they name the patterns explicitly: buying or selling links for ranking purposes, including exchanging money, goods or services for links; excessive link exchanges; large-scale article marketing or guest posting campaigns with keyword-rich anchor text; automated link creation; and requiring a link as a condition of a contract without allowing a qualifier such as a nofollow or sponsored attribute. The guidance also states that paid links can be made compliant by marking them appropriately, which is the point most vendors leave out, because a link marked as sponsored does not pass the ranking benefit they are selling. Read that carefully before buying any placement: the honest reading is that a link you paid for and did not mark is a policy violation, and the risk of that sits with your site, not with the vendor who sold it.
What actually earns links, and what it costs
Three approaches produce links that survive scrutiny. Original data is the most reliable: a survey, an analysis of your own operational data, or a benchmark that journalists and bloggers in your field have a reason to cite. Genuinely useful tools and reference resources are the second, because people link to things they use repeatedly. Relationships and participation are the third, which covers real contributed articles, industry association membership, sponsorships disclosed properly, and being the source a trade publication calls. All three are slower and more expensive per link than buying placements, and all three produce assets that keep earning after the campaign stops. Price varies enormously and no honest provider quotes a fixed cost per link for this kind of work, because the unit of production is a piece of work, not a placement. Where a provider does quote per link, ask what exactly you are buying and whether the placement was paid for.
How to vet a link building provider
Ask three questions and listen to the shape of the answers. First, how is each link obtained, specifically, for a named recent client. A provider doing legitimate work will describe outreach, an asset and a reason someone linked. A provider buying placements will talk about metrics, turnaround times and monthly volume. Second, does money or anything of value change hands with the publisher, and if so, is the link marked as sponsored. Any hesitation here is your answer. Third, what happens if a placement is later removed or the site is deindexed, and will you receive a full list of every link built. Insist on that list monthly, in a format you keep, because you will need it if you ever have to disavow or explain a link profile. Finally, be suspicious of guaranteed volumes and of domain authority thresholds used as a quality proxy, since both are easy to satisfy on networks built for exactly that purpose.
Questions people ask about seo and link building
Is buying links ever safe?
Buying a link for ranking purposes without marking it is described in Google's spam policies as a link scheme, and the risk lands on your site. Paid placements can be compliant when marked as sponsored, but a marked link does not deliver the ranking effect vendors are selling. Treat paid placements as advertising, valued on referral traffic and brand exposure.
How many links does a site need?
There is no universal number. The practical benchmark is comparative: look at what the pages currently ranking for your target query have, in quality and relevance rather than raw count, and judge the gap. For long-tail and local queries the gap is often small enough that content and technical work alone close it.
Do domain authority scores tell me if a link is good?
Only loosely. Third-party authority scores are estimates built by their vendors and can be inflated deliberately, which is why link sellers quote them. Better questions are whether the site has a real audience in your field, whether the page would exist without the link business, and whether a reader would plausibly click through.
Should link building be bought separately or inside a retainer?
Either works, but insist it is itemised so you can see what proportion of the fee it consumes and judge it on its own. Bundled retainers frequently hide low-quality placements inside a headline number, and separating the line item makes the monthly link list and its provenance much easier to review.