The verdict in three sentences
Over 3 years, a SaaS CMS (Webflow Enterprise, Wix Enterprise, HubSpot CMS) and a custom agency build land in similar cost ranges, but they are not comparable on value: SaaS rents a platform (lock-in, limited customization), the agency delivers an asset you own. SaaS wins when the need is simple and the internal team autonomous; the agency wins as soon as you need deep GDPR/accessibility compliance, custom integrations or independence. The tipping point is about the level of demand, not the raw budget.
Total cost of ownership (TCO) over 3 years
Here are 2026 ballpark figures for a 20-30 page institutional site, in EUR.
| Item | SaaS CMS | Custom agency |
|---|---|---|
| Setup / initial build | 5,000-15,000 EUR | 30,000-55,000 EUR |
| Platform subscription | 350-1,200 EUR/month | 0 EUR |
| Maintenance | Often included | 200-500 EUR/month |
| 3-year cumulative cost | 17,600-58,200 EUR | 37,200-73,000 EUR |
| Code ownership | No (rental) | Yes (delivered) |
Over 3 years SaaS may look cheaper, but the subscription is perpetual: by year 5 or 6, custom pulls ahead again, and you own it. The "economical" SaaS at year 3 becomes the most expensive at year 7.
The risk matrix and switching thresholds
| Criterion | SaaS advantage | Custom advantage |
|---|---|---|
| Speed to launch | Yes (2-6 weeks) | No (8-16 weeks) |
| Ownership / reversibility | No (lock-in) | Yes |
| Fine WCAG 2.1 AA accessibility | Partial | Full |
| GDPR compliance / EU hosting | Varies by vendor | Controlled |
| Custom integrations (ERP, IT systems) | Limited | Unlimited |
| Long-term cost (5 years+) | Rising | Stabilized |
Switch to custom as soon as one of these is true: a tender requiring audited WCAG AA, mandated sovereign hosting, integration with an internal IT system, or a desire not to depend on a vendor. Stay on SaaS if the need is an evolving brochure site managed by an autonomous marketing team.
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Mini case study
Jean-Marc, secretary general of a local public institution in Berlin, is torn. The chosen SaaS would cost 9,000 EUR setup + 700 EUR/month, i.e. 34,200 EUR over 3 years and 59,400 EUR over 5 years. The custom agency offer is 42,000 EUR + 350 EUR/month maintenance, i.e. 54,600 EUR over 3 years but 63,000 EUR over 5 years, with delivered code and sovereign hosting. Since his specification mandates audited WCAG 2.1 AA and compliant EU hosting (eliminatory criteria in his public tender), he chooses custom: the 20,400 EUR gap at 3 years closes by year 5 and avoids a disqualifying compliance risk.
FAQ
Is SaaS really cheaper? At 3 years often yes, at 5-7 years often no, because the subscription never stops. Compute TCO over the site's full expected lifespan, not just 36 months.
What is vendor lock-in concretely? Your content, design and data live inside the platform. Leaving means rebuilding: migrating a Webflow or HubSpot site to another stack often costs 40 to 70 % of a new project.
Can a SaaS CMS be GDPR and WCAG AA compliant? Partially. Hosting and some accessibility building blocks depend on the vendor, often outside the EU. For a demanding public tender, custom offers full control.
What is the launch timeline in each case? SaaS: 2 to 6 weeks. Custom: 8 to 16 weeks. If timeline is your top constraint and compliance demands are low, SaaS has the edge.
Can you start on SaaS then move to custom? Yes, a common path: validate the need on SaaS, then insource with custom when traffic or requirements grow. Budget the migration cost from the start.
Let's scope your project. Describe your scope (page count, GDPR/accessibility requirements, integrations): we build a costed SaaS vs custom TCO comparison over 3 and 5 years. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
