The verdict in three sentences
A trade association of 3,000 members in London pays between 40,000 and 90,000 EUR in 2026 for a custom platform covering member portal, dues, events and directory. The return on investment comes mostly from halving admin workload: fewer manual reminders, automated collection, an always-current directory. Budget 5 to 7 months of delivery and native GDPR compliance, since you handle personal data at scale.
What a membership platform covers in 2026
An association manages a lifecycle, not just a list (join, pay dues, renew, participate, lapse). Here is the typical budget breakdown of a custom project.
| Module | Scope | 2026 order of magnitude (EUR) |
|---|---|---|
| Member portal + directory | Profile, documents, filterable directory | 10,000 - 18,000 |
| Online dues | Card/SEPA payment, reminders, receipts | 8,000 - 16,000 |
| Event management | Registration, quotas, badges, payment | 7,000 - 15,000 |
| Admin back office | Dashboard, exports, roles | 6,000 - 14,000 |
| GDPR & security | Register, consent, encryption | 4,000 - 9,000 |
| Integrations (accounting, email) | Accounting API, Brevo, SSO | 5,000 - 12,000 |
An association on a tight budget starts with portal + dues (the core that pays off immediately), then adds events and integrations in phase 2.
Generic SaaS vs custom platform
SaaS tools exist. Custom is justified when you want your brand, your business rules and ownership of your data.
| Criterion | Membership SaaS | Custom platform |
|---|---|---|
| Year 1 cost | 3,000 - 9,000 EUR/yr | 40,000 - 90,000 EUR |
| Year 3 cost (cumulative) | 9,000 - 27,000 EUR | 50,000 - 105,000 EUR |
| Specific business rules | Limited | Unlimited |
| Brand & UX | Templated | 100% yours |
| Data ownership | With the vendor | With you (EU hosting) |
| Per-transaction fees | 0.5 - 1.5% | PSP fees only |
Below 1,000 members, SaaS is often the right call. Above 2,500 members with recurring paid events, custom pays back in 3-4 years and frees you from per-transaction fees.
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Mini case study
Sylvie, general secretary of a 3,000-member association in London. Her team spends about 6 hours a week on dues reminders and directory updates, i.e. ~300 hours/year at a loaded cost of 35 EUR/h = 10,500 EUR/year. The platform (chosen budget: 62,000 EUR) automates 55% of that, saving ~5,800 EUR/year, plus +8% renewal rate from automated reminders (on 400,000 EUR of dues, that is ~32,000 EUR extra collected in year one). The investment is absorbed in under 2 years.
FAQ
How long to deliver the platform? Budget 5 to 7 months: 3-4 weeks of scoping, then sprints with a first version (portal + dues) live around month 3. Events and integrations follow.
How do you handle GDPR with 3,000 profiles? Processing register, timestamped consent, encryption of sensitive data and EU hosting. This foundation is about 4,000 to 9,000 EUR of the budget and is non-negotiable.
Can we collect dues by SEPA direct debit? Yes. SEPA lowers failed-payment rates versus cards and costs less per transaction for recurring amounts. It is often combined with cards for new members.
What happens to our existing directory? We import your base (Excel, legacy tool) with duplicate cleaning. Allow 1-2 weeks of data migration depending on the source file quality.
Can we start small then expand? Yes, recommended. A phase 1 at 35,000 - 45,000 EUR (portal + dues) delivers value fast, then you fund later modules from the savings.
Let's scope your project. Share your member count, priority modules (dues, events, directory) and an indicative budget. 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.
