The verdict in three sentences
In 2026, a custom customer portal in New York costs 40 000-90 000 USD for a usable MVP, and 100 000-220 000 USD for a full version with SSO, billing and API. The biggest cost driver is not design but authentication, integrations and security, which often make up 45-55% of the budget. ROI shows up mainly as fewer support calls (-25 to -35%) and saved admin time, not direct revenue.
What each module costs in 2026
A customer portal is built module by module, not as a monolith. Here are 2026 ranges seen on New York mid-market projects, at a blended rate of 120-200 USD/hour.
| Module | Effort (person-days) | 2026 cost (USD) |
|---|---|---|
| Authentication + SSO (SAML/OIDC) | 8-15 d | 9 000 - 20 000 |
| Billing area + PDF download | 10-18 d | 11 000 - 24 000 |
| Messaging / support tickets | 12-20 d | 13 000 - 28 000 |
| Document management (DMS) | 8-16 d | 9 000 - 22 000 |
| ERP/CRM API connection | 10-25 d | 12 000 - 33 000 |
| Admin back-office + roles | 8-14 d | 9 000 - 18 000 |
| Design system + UI build | 6-12 d | 7 000 - 16 000 |
An MVP usually covers 3-4 modules (auth, billing, tickets), which explains the 40 000-90 000 USD range. The full version adds DMS, two-way API, multi-role access and notifications.
MVP, full version and recurring costs
| Item | MVP | Full version |
|---|---|---|
| Scope | 3-4 modules | 6-8 modules |
| Build budget (USD) | 40 000 - 90 000 | 100 000 - 220 000 |
| Timeline | 4-6 months | 6-9 months |
| Blended rate | 120 - 180 | 140 - 200 |
| Hosting + run (USD/mo) | 500 - 900 | 900 - 1 600 |
| Annual maintenance | 15-18% of build | 18-22% of build |
The monthly run (US/EU hosting, monitoring, backups, security patches) is often underestimated: budget 500-1 600 USD/month depending on traffic and required uptime.
Mini case study
Thomas, IT director of an industrial distribution firm in New York (140 employees, 900 active B2B customers), handles 1,100 support calls/month, 40% of them just for invoices or order status. He commissions an MVP portal at 65 000 USD (SSO auth, billing, tickets, order tracking).
Over 12 months: invoice and status requests move to self-service, cutting -32% of calls (about 350 avoided per month). At an internal cost of 11 USD per handled call, savings reach ~46 000 USD/year. With a run of 900 USD/month (10 800 USD/year), the portal pays back in about 18 months, before counting brand and retention gains.
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FAQ
What is a realistic minimum budget to start?
Budget at least 40 000 USD for a credible 3-module MVP. Below that you get a styled form, not a real secured portal with SSO and role management.
Is SSO really essential?
For a mid-market company, yes: it costs 9 000-20 000 USD but removes password sprawl, cuts login tickets (often 15% of support) and simplifies security audits.
Should we build custom instead of buying SaaS?
Custom pays off when you have specific business processes or more than ~40 internal users; below that, an off-the-shelf extranet SaaS at 20-100 USD/seat/month may be enough at first.
How much is maintenance after launch?
Serious maintenance is 15-22% of build cost per year, i.e. 10 000-40 000 USD depending on scope, plus monthly hosting.
How long until go-live?
Expect 4-6 months for an MVP and 6-9 months for a full version, including scoping, UAT and data migration.
Let's scope your project. Tell us your priority modules (SSO, billing, tickets, ERP API), your customer count and your 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.
