Custom client portal vs off-the-shelf SaaS: 2026 comparison

The verdict in three sentences

A SaaS client portal costs EUR 15 to 80/user/month in 2026; a custom portal costs EUR 20,000 to 50,000 upfront, then maintenance. The financial tipping point usually sits between 30 and 50 users over a 3-year horizon. Beyond the invoice alone, the decision turns on customisation, data ownership and vendor lock-in.

The financial tipping point

The key reasoning is total cost of ownership (TCO) over 3 years, as a function of user count.

Custom has a near-fixed cost regardless of user count, whereas SaaS grows linearly: that is why it becomes profitable above a certain volume.

Beyond price: the qualitative criteria

TCO does not tell the whole story. Here are the criteria that often tip the balance in B2B.

Mini case study

Sarah, COO of a 90-user B2B services company in Brussels, is weighing a SaaS at EUR 45/user/month against a custom portal. Over 3 years the SaaS would cost 90 x 45 x 36 = EUR 145,800. A custom portal at EUR 38,000 plus 15%/year maintenance amounts to 38,000 + (3 x 5,700) = EUR 55,100 over the same period. The saving reaches around EUR 90,700 over 3 years, before counting data control and customisation. Her company's tipping point was at just 35 users, comfortably exceeded.

FAQ

Above how many users does custom become profitable? As a 2026 order of magnitude, between 30 and 50 users over 3 years, depending on the SaaS rate. The more users you have, the wider the gap in favour of custom.

Is SaaS really faster to launch? Yes, a few days versus 8 to 16 weeks for custom. If you must start immediately, a SaaS can serve as a transitional solution before a dedicated build.

What happens if my SaaS vendor shuts down? That is the vendor lock-in risk: costly migration, even loss of data access. Custom eliminates this risk since you own the code and the data.

Can a SaaS be customised as much as a custom build? No. A SaaS adapts through options and settings, but any specific business need remains constrained by the vendor's roadmap.

Does custom cost more to maintain? Expect 12 to 18%/year of the build, a fixed and predictable cost, unlike a SaaS subscription that grows with your headcount.

Let's scope your project. Tell us your user count and your data constraints for a costed SaaS-vs-custom trade-off, target budget EUR 20,000-50,000. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.