Hidden Costs: Vertical SaaS vs Custom Software 2026 (Dublin)

The verdict in three sentences

The sticker price of a vertical SaaS (20 to 100 EUR/user/month) is only part of the bill: add paid modules, implementation fees of 5,000 to 30,000 EUR and the cost of vendor lock-in. Custom costs 40,000 to 120,000 EUR of build plus 8 to 15%/year maintenance, but you own the code and control your costs. The break-even between the two models generally lands at 3-4 years of operation.

The hidden costs of vertical SaaS

A vertical SaaS is designed for a specific sector. Its advertised subscription is attractive, but the real cost surfaces in use. Here are the items pricing sheets do not show.

Lock-in is the most insidious cost: the more you anchor your data and processes in the SaaS, the higher the psychological and financial cost of leaving. That is what enables imposed price hikes.

Full 4-year comparison

Let's compare a vertical SaaS and a custom build on an identical scope of 35 users, hidden costs included.

The curves cross toward the end of year 3. Beyond that, each additional year widens the gap in favor of custom, because maintenance stays stable while the SaaS subscription rises mechanically.

Mini case study

Omar, finance director of a consulting firm in Dublin (35 consultants), uses a vertical mission-management SaaS at 60 EUR/user/month. Actual year 1 bill: 25,200 EUR subscription + 14,000 EUR implementation + 6,000 EUR modules = 45,200 EUR. Over 4 years with increases: ~142,000 EUR, plus total vendor dependence.

An equivalent custom build is estimated at 85,000 EUR + 10,000 EUR/year maintenance, i.e. 125,000 EUR over 4 years, code owned. Omar switches because two key functions (fixed-fee billing, client rebilling) require adaptations the SaaS charges extra for every year. 4-year saving: 17,000 EUR, and above all the end of lock-in.

FAQ

What are the real hidden costs of a vertical SaaS?

Implementation fees (5,000-30,000 EUR), paid modules, custom integrations, training and exit data migration. These items can double the first-year cost versus the advertised subscription.

At what horizon does custom become cheaper?

Break-even generally lands at 3-4 years. Beyond that, custom's stable maintenance beats the SaaS subscription that rises 5 to 12% per year.

Is vendor lock-in quantifiable?

Yes: exit data extraction and migration costs 5,000 to 30,000 EUR, not counting internal time and operational risk. It is a real cost, even if it only appears when you leave.

Is a vertical SaaS still relevant?

Absolutely, for a standard need, a small user base and a fast start. Custom wins as soon as the need is specific, structuring and durable.

How do you avoid pricing surprises?

Demand the full 4-year TCO, including implementation, modules, annual increases and exit cost. Compare it to amortized custom before signing.

Let's scope your project. Send us the SaaS you use, your user count and your ancillary fees: we cost the hidden-cost-inclusive 4-year comparison. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.