The verdict in three sentences
A multi-site platform (corporate site + subsidiaries on a shared design system and CMS) costs 40,000 to 120,000 EUR excl. tax in 2026 depending on the number of sites. The real economic lever is the reusable design system: each additional site costs 30 to 50% less than if built in isolation. The ROI is measured not only in euros but in brand consistency and speed: launching a new subsidiary site in days rather than months.
Budget by number of sites
The initial investment builds the foundation: design system, shared CMS, governance. After that, each marginal site is far cheaper.
| Scope | Number of sites | 2026 platform budget (EUR excl. tax) | Cost per additional site |
|---|---|---|---|
| Corporate + 1 subsidiary | 2 | 40,000 – 55,000 | 12,000 – 18,000 |
| Corporate + 3 subsidiaries | 4 | 55,000 – 80,000 | 9,000 – 14,000 |
| Corporate + 6 brands | 7 | 80,000 – 110,000 | 7,000 – 11,000 |
| International group | 10+ | 100,000 – 120,000+ | 6,000 – 9,000 |
The first site carries most of the cost because it funds the design system. From the third site on, economies of scale become clear.
The design-system effect
A shared design system (components, tokens, templates) pools development once and for all. Here is the comparison for a subsidiary site built in isolation vs on the platform.
| Item | Isolated site (EUR excl. tax) | On platform (EUR excl. tax) | Saving |
|---|---|---|---|
| Design & components | 8,000 – 12,000 | 2,000 – 4,000 | ~65% |
| Front development | 10,000 – 15,000 | 4,000 – 7,000 | ~55% |
| CMS configuration | 3,000 – 5,000 | 1,000 – 2,000 | ~60% |
| Go-live | 2 – 3 months | 2 – 4 weeks | ~70% time |
Editorial governance (roles, approval workflow, multilingual) is centralized: a single team drives consistency across all sites.
The ROI of a shared platform
Beyond per-site savings, the platform protects the brand: guidelines enforced automatically, updates pushed everywhere at once. And time-to-market collapses: launching a new subsidiary or event site takes days, not months, letting you seize commercial opportunities an isolated site would miss.
Mini case study
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Aminata, communications director of a pan-African group in Abidjan managing 6 subsidiaries, rebuilds everything on a shared platform for 95,000 EUR excl. tax. Built in isolation, those 7 sites would cost roughly 7 x 20,000 = 140,000 EUR. Immediate saving: 45,000 EUR. More importantly, each future subsidiary site drops from 20,000 EUR and 3 months to 9,000 EUR and 3 weeks. Across two planned subsidiaries she saves a further 22,000 EUR and five months of cumulative time.
FAQ
Why not build each site separately?
Because each isolated site re-pays for design, development and CMS from scratch. A platform pools those costs: from the third site the saving exceeds 30% and brand consistency is guaranteed.
How much to add a site afterward?
On an existing platform, 6,000 to 14,000 EUR depending on complexity, versus 20,000 EUR or more for an isolated site. With the foundation already funded, only content and configuration remain.
Is a single CMS for all sites risky?
No, if governance is well designed: per-subsidiary roles, approval workflow, content isolation. A well-configured shared CMS strengthens security and simplifies maintenance rather than the opposite.
Is multilingual included?
It is added to the foundation once, then propagates to all sites. Budget 1,500 to 4,000 EUR per language at platform scale, far less than making each site multilingual separately.
How long to deliver the full platform?
Expect 4 to 8 months for the foundation and first sites, depending on scope. Subsequent sites then deploy in 2 to 4 weeks each thanks to the design system.
Let's scope your project. Send us your number of sites, languages and timeline, and we'll price the platform and the cost per additional site. 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.
