Custom Client Portal Build Cost (2026)

The verdict in three sentences

In 2026, a custom client portal costs between 18,000 and 35,000 EUR excl. tax for a simple space (order tracking, documents, invoices) and between 40,000 and 80,000 EUR excl. tax for a full portal with payment, tickets and an API into your business tool. The real cost driver is not the screen: it is authentication/SSO, role management and integration with your ERP or CRM. The return on investment is measured in avoided support requests: -40 % repetitive tickets within the first six months.

What each budget tier covers

A client portal is not a brochure site with a login. It is a business application: each user sees their own data, their own permissions, their own documents. Cost rises with the number of roles, integration depth and security level.

These figures are a 2026 order of magnitude for a European provider or a structured agency. Custom pays off as soon as your processes fall outside the boxes of a generic SaaS tool.

The cost items that make the difference

Many executives underestimate the invisible foundations. Here is the typical split of a 50,000 EUR budget.

Then budget maintenance (TMA) of 15 to 20 % of the initial cost per year, i.e. 7,500 to 10,000 EUR/year for a 50,000 EUR portal. That covers fixes, minor evolutions, security monitoring and managed hosting.

Mini case study

Take Claire, CFO of an industrial SME in Lyon (45 staff, 320 active B2B clients). Her order-management team handles about 180 calls/month asking "where is my order?" and "can you resend the invoice?". Each call takes 8 minutes, i.e. 24 hours/month of admin time valued at 32 EUR/loaded hour: 768 EUR/month, or 9,200 EUR/year.

Claire invests 34,000 EUR excl. tax in a mid portal (tracking, documents, invoices, tickets) with 6,800 EUR/year of maintenance. The portal absorbs 40 % of requests by month six, then 55 % in year two. Annual saving in year two: 5,060 EUR of order-desk time, plus client satisfaction up 11 points. The portal is amortised over its 5-6 year life while freeing the team for higher-value work.

FAQ

Is a custom portal more expensive than a SaaS solution?

Upfront, yes: SaaS starts at 30-80 EUR/user/month. But past 40-50 users or specific processes, custom becomes competitive over 4-5 years, with no per-seat cost and no dependence on a third-party roadmap.

How long to deliver a first portal?

Expect 6 to 9 weeks for a simple base, 14 to 22 weeks for a full portal. A working MVP can go live in 8 weeks then grow in batches.

Do we have to integrate our ERP?

No, but that is where value is created. An unconnected portal forces double data entry. API integration (even nightly sync) is 25-30 % of the budget but removes manual work.

What maintenance budget should we plan each year?

A TMA of 15 to 20 % of the initial cost, i.e. 7,500 to 10,000 EUR/year for a 50,000 EUR portal. That is the price of security, fixes and continuous small improvements.

Can the portal evolve after launch?

Yes, that is the point of custom. You ship a base, then add payment, signature, new roles or modules in sprints, without rebuilding everything.

Let's scope your project. Tell us your user roles, the business tool to connect and your indicative budget: we frame the scope and propose an MVP deliverable in 8 weeks. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.