Is link building cheaper in-house or through an agency?

The comparison is usually framed as salary versus retainer, which understates the in-house cost and misses the thing you are actually buying from an agency.

The real in-house number

An SEO specialist costs $53,000–$98,000 a year in salary. Loaded with benefits and overhead that is roughly $98,000 annually, or about $7,300 a month — before tooling, which adds a few hundred more.

Three costs get left out of most comparisons:

Ramp time. Three to six months between deciding to hire and the first placement. During that period you are paying full cost for no output.

Opportunity cost. That person is not only doing link building. They are also handling technical SEO, content briefs and reporting. Realistically you are getting perhaps half their time on links, so the effective cost is closer to $14,000 a month of loaded salary per full-time-equivalent of link work.

Relationship building. Publisher relationships take a year or more to develop. A new hire starts at zero regardless of their CV, unless they bring an existing list with them.

Notably, in-house teams allocate 36.03% of their SEO budget to link building against 32.1% for agencies. In-house is not a way to stop spending on placements — it is a way to manage that spending yourself.

What you are actually renting from an agency

Not labour. Access. An agency with forty clients has an outreach operation and a publisher list that no single hire can replicate at your volume. That is the whole arbitrage, and it is real.

Against that: the agency’s list is shared with its other clients, its incentives favour volume over selectivity, and you have less control over which pages get the links.

Where the crossover sits

The crossover is not really about money. It is about whether you can hire someone who already has publisher relationships in your category. If you can, in-house wins earlier than the table suggests. If you are hiring a generalist and hoping they build a list, it wins much later.

The hybrid that usually works

Most SaaS companies above $10,000 a month land somewhere in the middle: one in-house person owning strategy, target page selection, quality control and reporting, with an agency doing outreach and placement.

This works because it splits along the right line. The judgement calls — which pages matter, what quality floor to enforce, when to stop — are yours and benefit from context an agency will never have. The volume work benefits from relationships you cannot build at your scale.

It also fixes the most common failure of a pure agency engagement, which is nobody internally owning whether the links are any good.

Deciding

Three questions:

1. Can you hire someone with existing publisher relationships in your category? If yes, in-house is viable much earlier. If no, add six months to any plan.
2. Is your link budget above or below $5,000 a month? Below, an agency wins on arithmetic alone.
3. Do you have someone who will own quality? If not, an agency engagement will drift regardless of how good the agency is.

Run the numbers for your own volume with the cost calculator — it shows the in-house monthly cost alongside the agency range. And if you are not sure you should be spending on links at all this quarter, the fit quiz will say so.

Questions