The verdict in three sentences
A client portal with billing for a marketing agency costs between EUR 15,000 and EUR 35,000 in 2026, delivered in 10 to 14 weeks. A Notion/ClickUp + Stripe stack costs a few tens of euros a month but carries no brand, caps out on automation and scatters your data. Custom is worth it once the portal becomes a sales argument and a cash-flow lever.
What a bespoke client portal costs in 2026
Pricing tracks project tracking (kanban, deliverable approval), billing (quotes, invoices, chasers) and online payment.
| Scope | Features | Cost EUR | Timeline |
|---|---|---|---|
| Essential | Project tracking, deliverables, messaging | 15,000 - 20,000 | 10-11 wks |
| Standard | + quotes, invoices, Stripe payment | 22,000 - 28,000 | 11-13 wks |
| Advanced | + client approval, auto chasers, reporting | 29,000 - 35,000 | 13-14 wks |
| Bespoke | + multi-brand, subscriptions, ledger API | 35,000+ | 14-18 wks |
Recurring: support at EUR 300/month (fixes, enhancements) plus Stripe fees of 1.5% + EUR 0.25 per European card transaction (2.9% + EUR 0.25 non-EU) and hosting from EUR 60/month.
Custom or Notion/ClickUp + Stripe: the limits
The no-code stack starts fast but hits limits on scale and brand.
| Criterion | Bespoke portal | Notion/ClickUp + Stripe |
|---|---|---|
| Upfront cost | EUR 15,000 - 35,000 | 0 - 2,000 (setup) |
| Recurring cost | EUR 300/mo + Stripe fees | EUR 40 - 120/mo + Stripe fees |
| Brand and UX | Full, agency domain | Tool interface |
| Billing automation | Native and reliable | Via Zapier/Make, fragile |
| Unified project + invoice view | Yes | Scattered data |
| Client experience | Premium, differentiating | Basic |
No-code suits a small shop. Past 30 recurring clients, custom protects the brand and hardens collection.
Mini case study
Tom, principal of an 18-person agency in Dublin, ran a 22-day average payment delay and time-consuming manual chasers. A Standard portal at EUR 26,000 with online invoices and Stripe payment cut the delay to 9 days. On EUR 1.2M revenue, saving 13 days of working capital frees roughly EUR 43,000 in cash, plus 3 hrs/week of chasing. Payback within the first year.
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
FAQ
Can clients pay by card and transfer in the portal?
Yes, Stripe handles card, SEPA and wallets. Fees are around 1.5% + EUR 0.25 per European transaction, built into the payment flow.
Can it handle deliverable approvals?
Yes, with approval workflow, comments and versions. This block is EUR 3,000-6,000 by granularity.
Can billing connect to my accountant?
Yes, via export or API (Xero, QuickBooks, Sage). A connector costs EUR 2,500-6,000.
How long to deliver the portal?
10-14 weeks for a Standard version, including 2 weeks of testing and migrating existing clients.
Isn't no-code enough at first?
Under 15 clients, yes. Beyond that, fragile automations and no brand cost credibility and time.
Let's scope your project. Tell us your recurring-client count and billing and tracking needs and we will scope a portal between EUR 15,000 and EUR 35,000. 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.
