Custom client portal development cost (2026)

The verdict in three sentences

A custom client portal for an SME costs between 18,000 and 55,000 EUR (excl. VAT) in 2026, delivered in 10 to 16 weeks. The price depends mainly on the number of user roles, the integrations (billing, CRM, ERP) and the required authentication level. It pays off through fewer support requests (-35% on average) and less administrative time.

What each budget tier covers

A client portal lets your customers view documents, track orders or cases, download invoices and communicate securely. The functional scope drives most of the price difference.

These ranges are a 2026 order of magnitude for the European market and vary by agency and region.

Cost items you must not forget

Initial development is only part of the total cost of ownership. Plan for hosting, maintenance and security from the quote stage.

Budget 8 to 15% of the development cost per year for maintenance: on a 30,000 EUR portal, that means 2,400 to 4,500 EUR per year for fixes, security updates and small improvements.

Mini case study

Claire, CFO of a 45-employee industrial SME in Nantes, receives about 320 calls and emails per month from customers asking for an invoice, a delivery note or an order status. She dedicates 1.5 admin FTE to this.

She invests 28,000 EUR in a client portal (documents + order tracking + notifications). After go-live, requests drop by 35%, or ~112 avoided contacts per month. At 6 minutes average handling time, that is 11.2 hours saved per month, roughly 134 hours per year. Valued at 35 EUR/h fully loaded, the saving reaches 4,690 EUR/year, before any brand benefit. With 3,000 EUR/year maintenance, the portal pays back in a little over 3 years on admin time alone, faster once customer retention is factored in.

FAQ

What is the difference between a client portal and a simple download area? A download area only makes files available. A client portal handles authentication, roles, order or case tracking, notifications and secure history. It is a web application, not a password-protected page.

Can we use a SaaS solution instead of custom? Yes for standard needs, from 15-50 EUR/user/month. Custom becomes worthwhile beyond ~25 active users or when you must integrate your ERP, customise workflows and control your data.

How long until production? Expect 10 to 16 weeks by scope: 2-3 weeks of framing, 6-10 of development, 2-3 of testing and deployment. An ERP connector often adds 2 to 4 weeks.

Is the portal GDPR compliant? Yes, provided consent management, data encryption, access logging and a retention policy are built in from the start. Include a compliance budget in the initial quote.

Which hosting should we choose? European hosting (OVH, Scaleway or managed cloud) at 50 to 150 EUR/month suits most SMEs, with daily encrypted backups and a documented disaster recovery plan.

Let's scope your project. Tell us your user roles, your integrations (billing, CRM, ERP) and your customer volume, and we will price a portal that fits your budget and timeline. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.