The verdict in three sentences
A foundation institutional website with a multi-level approval workflow, donor area and interactive annual report costs between 18,000 and 40,000 EUR net in London in 2026, over 9 to 13 weeks. Content governance on a Sanity CMS (fine editorial roles) and the secure donation form are the core of the budget. Budget a maintenance retainer at 14% of build per year to keep security, compliance and annual-report evolutions.
Budget per tier
A foundation general secretary buys trust and editorial traceability. Here is the 2026 order of magnitude in EUR net.
| Tier | Scope | Price EUR net | Timeline |
|---|---|---|---|
| Foundation Standard | 12-20 pages, CMS, simple donations | 18,000 - 24,000 | 9-10 wks |
| Foundation Premium | + donor area, workflow | 26,000 - 34,000 | 11-12 wks |
| Foundation Complete | + interactive annual report, data-viz | 36,000 - 40,000+ | 12-13 wks |
| Secure donation form | PSP, tax receipt, recurrence | +4,000 - 9,000 | +1-2 wks |
| Interactive annual report | Data-viz, animated key figures | +5,000 - 11,000 | +2-3 wks |
Content governance: roles and workflow
The value of a foundation site lies in traceability: who writes, who approves, who publishes. The Sanity CMS enables fine roles and a multi-level workflow.
| Editorial role | Rights | Setup cost |
|---|---|---|
| Contributor | Writes, proposes | included in build |
| Reviewer | Approves content | +900 - 2,000 EUR |
| Legal validator | Approves compliance | +1,200 - 2,800 EUR |
| Publisher (SG/comms) | Publishes | included in build |
| Administrator | Roles, schema | included in build |
Sanity CMS, donations and maintenance
Recurring items and secure donation payment are often underestimated. Here are the 2026 key figures.
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| Item | 2026 range | Detail |
|---|---|---|
| Sanity CMS (subscription) | 1,300 - 4,000 EUR/yr | by users |
| Secure donation form | 4,000 - 9,000 EUR | PSP, tax receipt |
| PSP fee per donation | 1.4 - 2.9% + 0.25 EUR | by provider |
| Interactive annual report | 5,000 - 11,000 EUR | data-viz, animations |
| Maintenance retainer | 14% of build/yr | security + evolution |
Mini case study
Jean-Marc, general secretary of a foundation in London (2,100 active donors), wants a site with an approval workflow, donor area and interactive annual report. Selected: Foundation Complete at 38,000 EUR net over 13 weeks, including 7,500 EUR for the donation form and 9,000 EUR for the annual report. Maintenance at 14% is 5,320 EUR/yr. Over 3 years, total cost 38,000 + 15,960 = 53,960 EUR net. With an optimized donation form and recurring giving, the foundation targets +18% online donations (~54,000 EUR of extra annual collection on a 300,000 EUR base), paying back the site in year one.
FAQ
Why a Sanity CMS rather than a classic CMS? Because it natively handles fine editorial roles and a multi-level approval workflow, essential for a foundation that stakes its word. Budget 1,300 to 4,000 EUR/yr subscription depending on the number of users.
How much for the secure donation form? Between 4,000 and 9,000 EUR depending on the payment provider, tax-receipt handling and recurring giving. Add PSP fees of 1.4 to 2.9% + 0.25 EUR per transaction.
Is the interactive annual report worth the investment? For a foundation, yes: it showcases impact with data-viz and reassures donors. Budget 5,000 to 11,000 EUR, often paid back by higher online donations.
How long to deliver the site? From 9 to 13 weeks depending on the workflow, donor area and annual report. Configuring editorial roles adds 1 to 2 weeks not to be forgotten.
What maintenance should we plan for? About 14% of build cost per year for security, updates and the annual report's yearly evolution. Below 11%, the donation form and compliance degrade.
Let's scope your project. Specify your approval workflow, the need for a donor area and an interactive annual report: we will frame a scope and an indicative budget between 18,000 and 40,000 EUR net. 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.