When a client asks us how much SEO costs, the easy answer is the monthly fee. The useful answer is different: it depends on how much a client who comes to you on their own is worth to your business — with no recurring advertising cost, because they found you on Google searching for exactly what you offer.
To answer that question, you need to do a calculation that most companies never do. And when you do it, SEO almost always turns out to be the marketing investment with the best long-term return. Not because it is cheap — it is not — but because the alternative of not doing it carries a cost that nobody is accounting for.
The cost of SEO in real numbers
The price of an SEO agency varies a lot depending on what it includes. At BAI Marketing, the SEO Module costs €250 per month and the initial audit is free of charge. Rather than comparing fees, compare what is inside each one: you will see it a little further down.
To that you must add time: SEO does not deliver results in the first month, and how long it takes to achieve significant rankings depends on the competitiveness of the sector and the starting state of the domain.
That is why it needs to be put into context.
The cost of not doing SEO
The alternative to organic SEO is paying for every visit. Google Ads, Meta Ads, any paid advertising channel. The cost per click on Google Ads for competitive terms in sectors such as professional services, construction, hospitality or property can be high, and only a small share of clicks ends up as a potential customer.
Let’s do the maths with your own numbers: divide what you spend on ads each month by the number of clients those ads bring you. That is your cost per client.
If that cost is a small part of what you earn from each client, advertising makes sense. If it eats up almost all of the margin, it does not.
Now compare that with the cost of SEO when it is working. A domain that ranks well for the purchase-intent searches in its sector receives organic visits every month with no additional cost per visit. The marginal cost of each new customer acquired through SEO decreases over time, approaching zero.
The calculation that’s never made: the accumulated value
SEO has one characteristic that paid advertising does not: value accumulates. An article that ranks in the third month of work keeps bringing traffic in month eighteen, in month thirty-six, potentially for years.
Paid advertising does not work like that. Every euro of advertising budget generates traffic while it is active, and the very day you stop paying, the traffic disappears.
This has important practical implications. For a business that expects to be in the market for five years, the comparison is not between the annual cost of SEO and the annual cost of advertising. It is between the total cost of SEO over five years and the total cost of paid advertising for the same volume of traffic and leads over those five years. When you do that calculation, SEO almost always wins by a wide margin.
The cost of a late start
There is an additional cost that nobody mentions: the cost of your competition having spent two or three years doing SEO by the time you decide to start.
SEO has economies of scale over time. A domain with three years of well-ranked content, hundreds of indexed pages, and accumulated authority is significantly harder to overtake than one that has been going for six months. Not impossible, but it requires more investment and more time.
Every month that passes without working on your company’s SEO is a month’s head start you’re giving to your competitors who are doing it.