Client portal for an accounting firm in Dublin: custom build cost in 2026

The verdict in three sentences

For a firm with 600 small-business clients, the portal bundled with the practice software is enough as long as document chasing stays manual and rare. Once staff spend more than 3 hours a week chasing receipts, a custom portal at 18,000 to 35,000 EUR pays for itself in 12 to 20 months. The decision hinges on three points: automated reminders, built-in e-signature and a client dashboard.

Vendor portal or custom portal

Most practice management and accounting production tools offer a client area. It covers document upload and sometimes report viewing, but stays locked into the vendor's workflow. A custom portal connects to the same software via API and adds your own business rules.

Above 400 active clients, a SaaS platform's per-client subscription often becomes more expensive than a custom build amortised over 3 years.

What each custom building block costs

Here is a 2026 estimate for a portal delivered by a mixed team, hosted in the EU to comply with GDPR and professional confidentiality.

Add 80 EUR per month for EU hosting with encrypted backups, and 300 to 500 EUR per month of maintenance. Realistic timeline: 10 to 16 weeks.

Where the time savings come from

The 3 to 5 hours saved per staff member per week come from specific tasks: email or phone reminders for missing documents, hunting for files sent by WhatsApp or post, resending the same information (certificates, company records, accounts) and back-and-forth to get a signature. A well-designed portal removes much of this, provided the firm enforces it: mandatory for new clients, and assisted migration of existing ones over 6 months. Without that change management effort, adoption plateaus around 40% and the savings are halved.

Mini case study

Siobhan, managing partner of a Dublin accounting firm with 12 staff and 600 small-business clients, measures 4 hours per week per staff member lost to reminders and document searches. She receives a quote of 28,000 EUR for a custom portal, plus 80 EUR of hosting and 400 EUR of monthly maintenance.

Estimated gain, with 70% adoption: 12 staff x 4 h x 70% x 45 weeks = 1,512 hours a year. Valued at a loaded hourly cost of 45 EUR, that is 68,040 EUR, to be redeployed into billable advisory work. Yearly recurring cost: 5,760 EUR. The investment is covered in about 6 months, and the portal becomes a sales argument for new clients.

FAQ

How much does a custom client portal for an accounting firm cost in 2026?

Plan 18,000 to 35,000 EUR depending on features, plus 80 EUR per month of EU hosting and 300 to 500 EUR of monthly maintenance. A minimal scope (document upload and messaging) starts around 12,000 EUR.

Can the portal connect to our practice software?

Yes, if the vendor offers an API, which most market solutions do. The connector costs 2,500 to 4,500 EUR and syncs clients, deadlines and documents every night.

Where should client data be hosted?

In the European Union, with an ISO 27001 certified host, encrypted documents and access logging. Budget: about 80 EUR per month for 600 clients.

How long does deployment take?

Between 10 and 16 weeks of development, then 3 to 6 months to migrate existing clients. Starting with new clients gets you to 30% adoption in the first quarter.

Is custom worth it for a small firm?

Below 200 clients, the vendor portal is usually more cost-effective. Custom becomes attractive above 400 clients or if you sell high-value advisory work.

Let's scope your project. Tell us your client count and practice software: we will price a client portal from 18,000 to 35,000 EUR, delivered in 10 to 16 weeks with EU hosting. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.