What are the red flags when hiring a link building agency?

Most of what separates a good link building agency from a poor one is visible on the first call. These are the nine signals worth listening for, roughly in order of how much they should worry you.

1. They will not show you recent live placements

This is the one that matters most, because it is the only claim that cannot be argued around. Ask for five links placed in the last 60 days for a client in a comparable category. An agency doing real work can produce these in minutes.

Every other claim — process, quality, relationships, results — can be described persuasively without being true. Live URLs either exist or they do not.

2. Guaranteed rankings or guaranteed metrics

Nobody controls Google’s ranking of your page, and nobody controls third-party authority scores. A guarantee of either is either meaningless or a promise to manipulate something. Both are reasons to stop.

Guaranteed link counts are different and perfectly normal — that is a delivery commitment the agency does control.

3. They cannot tell you where the links will come from

If an agency cannot describe its sourcing and its vetting — what tools it uses, what metrics it checks, what disqualifies a site — the most likely explanation is inventory it would rather not describe. Links from private blog networks, link farms and content mills with no real audience are the classic trigger for a manual action, and recovery typically takes two to six months even when handled correctly.

4. They quote before asking about your category

Per-link costs range from $141 to over $1,500 depending on vertical and target authority. A price quoted before any discussion of your market was not calculated — it was selected. Often it was selected against what you said you were currently spending.

5. No link monitoring after placement

Ahrefs found 66.5% of links built between 2013 and 2024 are now dead. An agency that places a link and moves on leaves you exposed to link rot on an asset you already paid for. Ask what the replacement window is; six months should be a floor and at least one agency in this market offers twelve.

6. Volume that does not fit the price

Twenty-five links for $5,000 is $200 a link. At that level, after the publisher’s fee and the writing, there is nothing left to fund prospecting or vetting. BuzzStream found only 1.37% of guest post opportunities meet quality standards — volume pricing means buying from the other 98.6%.

7. Evasiveness about paid placements

Only 21.4% of link builders used manual outreach as their main strategy in 2025, down from 38.2% the year before. Something replaced it, and in many cases it is paid placement described in editorial language. Ask directly what proportion of placements involve a payment to the publisher. The question is fair and the answer should be a number.

8. Domain-level reporting only

Domain-wide referring domain counts always rise, which is precisely why they get reported. Rankings are decided page by page. Ask for referring domains to the target URL, and treat reluctance as informative.

9. Nothing they would advise you against

An agency that has never told a prospect that link building is the wrong spend this quarter is either very lucky with its pipeline or not being straight with it. Ask what would make them turn the work down. The answer is hard to fake because it costs them the sale.

None of these are proof of bad faith on their own — several have innocent explanations, and plenty of good agencies will fail one of them for reasons they can explain. The point is to ask, and to notice whether the answer is specific.

Take the eleven standard questions into every call, check the contract clauses before signing, and compare what each agency actually publishes in the comparison table.

Questions