The verdict in three sentences
A multi-site platform (1 parent + 5 subsidiaries) rests on a shared foundation — monorepo, design system, shared CMS — priced at 45 000 to 85 000 USD, then 5 000 to 9 000 USD per subsidiary. Pooling generates savings of about 40% versus 6 sites built separately. Plan for 16 to 22 weeks of production and per-subsidiary editorial governance to avoid content chaos.
The shared architecture
The principle: a common technical foundation carries the design system, components and CMS, with each subsidiary inheriting the foundation while keeping its identity. Here is the 2026 platform budget breakdown.
| Foundation component | Role | Range (USD) |
|---|---|---|
| Monorepo & CI/CD | Shared codebase, deployment | 8 000 - 15 000 |
| Design system | Tokens, reusable components | 12 000 - 22 000 |
| Multi-tenant shared CMS | Per-subsidiary content, roles | 11 000 - 20 000 |
| Parent site | 15-25 pages, group governance | 9 000 - 16 000 |
| SEO & i18n foundation | Hreflang, sitemap, perf | 6 000 - 12 000 |
| Platform total | 45 000 - 85 000 |
Once the foundation ships, each subsidiary costs 5 000 to 9 000 USD: theming, specific pages, content. The design system ensures visual consistency without re-developing components.
The economics of pooling
The ROI calculation is simple: building 6 independent sites costs far more than pooling the foundation. Here is the costed comparison for 6 entities.
| Approach | Build cost | 3-year cost (incl. maintenance) |
|---|---|---|
| 6 separate sites | ~140 000 USD | ~250 000 USD |
| Platform + 5 subsidiaries | ~85 000 USD | ~160 000 USD |
| Savings | ~39% | ~36% |
Pooled maintenance (1 400 to 3 000 USD/month for the whole estate) is the second lever: a security fix or a design-system evolution propagates to all subsidiaries in a single intervention.
Mini case study
Maria, General Counsel of a Miami group (1 parent + 5 industrial subsidiaries), wants to harmonise 6 ageing sites. Platform quote 58 000 USD + 5 subsidiaries at 7 000 USD = 93 000 USD, delivered in 19 weeks. Against 6 separate sites estimated at 142 000 USD, build savings reach 49 000 USD. Over 3 years, pooled maintenance 2 200 USD/month = 79 200 USD versus ~115 000 USD for 6 independent maintenance contracts. Total ownership gain: about 77 800 USD, not counting the restored brand consistency.
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FAQ
What is a shared multi-site foundation?
A common technical base (monorepo, design system, shared CMS) that all subsidiary sites inherit. Components are built once then reused, cutting cost and timeline.
How much does adding a subsidiary cost?
Between 5 000 and 9 000 USD once the foundation ships: theming, specific pages and content. That is 3 to 4 times cheaper than an equivalent standalone site.
Does pooling really save 40%?
Yes, on both build and maintenance: a fix or a design-system evolution propagates to all subsidiaries in one intervention. The saving is clearest from 4-5 entities onward.
Can each subsidiary keep its identity?
Yes: the design system provides tokens (colours, typography) adjustable per subsidiary. Group consistency is preserved while local identity remains possible.
What is the timeline for a multi-site project?
16 to 22 weeks: the foundation and parent site first (12-14 weeks), then subsidiary rollout in parallel. Multilingual adds 2 to 4 weeks.
Let's scope your project. Tell us the number of subsidiaries, their languages and your brand constraints, and we will price the foundation and per-subsidiary cost with the pooling scenario. 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.
