The question asked most often when people start exploring is about cost. The most honest answer: it depends on what you put into it.
A portal that only shows invoices through Zoho Books can be delivered in weeks. A portal with full file access, document exchange, forms, ticket handling, an Exact Online integration and an ERP integration for order status is a project of months.
The payback period can almost always be demonstrated. Count the hours your back office, finance or customer service team spend on routine questions a portal answers on its own: sending invoice copies, passing on order statuses, emailing documents, phoning through updates. In most organisations we analyse, that is ten to thirty per cent of the volume of incoming customer contact. Work that out in person-hours per month and the business case writes itself.
That is the analysis we always do before the build request: what will the portal take on, what does that deliver, and what makes sense to build first?