The verdict in three sentences
A multisite platform uniting the corporate parent and 5 subsidiaries around a shared design system costs between 60,000 and 150,000 EUR net in 2026 over 5 to 8 months. The math is compelling: pooling the foundation rather than ordering 6 separate sites saves around 40 % and cuts the cost of adding a new subsidiary by a factor of three. The real deliverable is not a website, it is centralized content governance that keeps brand consistency across the whole group.
Pooled cost per subsidiary
The advantage of a multisite architecture is that the bulk of the investment (design system, technical foundation, governance) is paid once and amortized across all entities.
| 2026 item | Separate sites (x6) | Multisite platform |
|---|---|---|
| Design system | 6 x 8,000 = 48,000 EUR | 15,000 EUR (once) |
| Technical foundation | 6 x 6,000 = 36,000 EUR | 25,000 EUR (once) |
| Sites/instances | included above | 6 x 6,000 = 36,000 EUR |
| Content governance | absent | 12,000 EUR |
| Total | ~130,000 EUR | ~88,000 EUR |
| Saving | baseline | ~-40 % |
The saving is not just a signature-day figure: it extends over time through unified maintenance and component reuse.
Maintenance and new-subsidiary deployment
Once the platform is live, two indicators matter to management: annual maintenance cost and the speed of onboarding a new entity.
| 2026 indicator | Value | Comment |
|---|---|---|
| Annual maintenance | 18 % of build | 11,000 - 27,000 EUR/year |
| New-subsidiary deployment | 2 - 3 weeks | vs 3-4 months for a separate site |
| New-subsidiary cost | 6,000 - 12,000 EUR | vs 20,000+ standalone |
| Global design update | 1 deployment | Propagated to all sites |
| Editorial governance | centralized | Approval workflow |
Adding a seventh subsidiary in 2027 will cost only a fraction of the initial price: the design system and foundation are already there, leaving only customization and content.
Mini case study
Celine, communications director of a 600-employee industrial group in Toronto, was managing 6 disparate sites built on 4 different technologies. The rebuild into a multisite platform cost 92,000 EUR net over 6 months. Result: 100 % brand-guideline compliance, annual maintenance down from 34,000 to 16,500 EUR, and the German subsidiary onboarded in 18 days instead of the usual 4 months. The maintenance saving alone pays back the project in a little over three years, before counting the brand-consistency gains.
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FAQ
Why not just duplicate one good site 6 times?
Because each copy becomes an independent technical debt: 6 security updates, 6 guidelines that drift apart, 6 maintenance invoices. A multisite platform centralizes all of this into a single governed foundation.
Does each subsidiary keep editorial autonomy?
Yes. The design system guarantees visual consistency, but each subsidiary has its own space, content and publishing rights via a configurable approval workflow.
How long to add a subsidiary afterwards?
Between 2 and 3 weeks once the platform is live, versus 3 to 4 months for a standalone site from scratch. The foundation and components are already available.
What is the annual maintenance cost?
Expect around 18 % of the build cost per year in maintenance, i.e. 11,000 to 27,000 EUR for a 6-entity platform, well below the sum of separate-site maintenance.
Which technology for a multisite in 2026?
A headless architecture (Next.js + structured CMS) with a shared design system is the standard: it allows autonomous instances while centralizing components, security and governance.
Let's scope your project. Give us your subsidiary count, current technologies and governance needs: we price the pooled foundation and the per-entity cost. 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.
