A SaaS platform is a web application which customers use through a browser for a recurring subscription. Building a SaaS platform takes more than a regular web app: tenants, roles, billing and GDPR obligations belong in the design from day one. In 2026, VirtuoLab indicates from €15,000 for a SaaS MVP and €30,000 to €80,000 for a full platform. A complex platform takes 12 to 24 weeks to build. Step 1 is an MVP which tests demand with sign-up, one core workflow and subscriptions. Step 2 adds team accounts, reporting and an API once customers pay. For example, a planning tool for the first 40 companies runs as one installation built with Next.js and PostgreSQL. Payment fees come on top: according to Stripe, Stripe Billing costs 0.7% of billing volume. Finally, the exact price follows a free intake call.
What is a SaaS platform?
A SaaS platform is an application which a provider runs in the cloud and customers use through a browser or an API. Customers pay a monthly or yearly subscription instead of buying a licence. Well-known examples are Exact Online, Slack and Google Workspace. Two technical traits define SaaS. First, the customer does not manage servers, operating systems or storage, as described in the cloud definition by NIST. The provider handles hosting, updates and backups for every customer at once. Second, most SaaS products are multi-tenant: one codebase and one database serve many customer organisations, while each organisation sees only its own data. For example, a planning tool for 40 companies runs as a single installation instead of 40. The real difference with a custom web app is the business model. A web app usually serves one company. A SaaS platform must sign up, bill and support many companies, which shapes every design decision in 2026.
What does it cost to build a SaaS platform in 2026?
Building a SaaS platform costs from €15,000 for a focused MVP and €30,000 to €80,000 for a full platform, according to the price indications of VirtuoLab for 2026. The main cost driver is scope: the number of user roles, integrations and billing scenarios. First, an MVP covers sign-up, one core workflow, a subscription and a simple admin panel. Second, a full platform adds team accounts, permissions per role, reporting, an API and integrations with tools such as Exact Online or HubSpot. Finally, running costs come on top of the build. Hosting for an application back end typically costs €50 to €500 per month, depending on traffic and data volume. Payment fees also apply. According to Stripe, Stripe Billing costs 0.7% of billing volume, plus 1.5% and €0.25 per standard EEA card payment. In practice, the build budget is a one-off investment, while hosting and payment fees grow with the number of customers. A fixed price per phase keeps the build budget predictable.
Which features does a SaaS platform need from day one?
A SaaS platform needs a shared foundation of features before the first paying customer signs up in 2026. The core feature is the reason customers pay, but the foundation turns a tool into a business. First, accounts and organisations: a user belongs to a company, and a company invites colleagues who can sign in with Google or Microsoft accounts. Second, roles and permissions, for example owner, admin and member. Third, subscriptions with trials, upgrades and invoices, with failed payments handled by Stripe Billing or Mollie. Additionally, an internal admin panel lets the founder view customers, support users and switch features on or off per plan. Without an admin panel, supporting even 20 customers turns into manual database work. Transactional email for sign-up, password resets and invoices is also part of the foundation. An audit log records who changed what and when. Finally, customers expect a data export, such as a CSV download of all records.
How do you keep customer data separate in a multi-tenant SaaS?
Multi-tenancy means one installation of the software serves many customer organisations, each with strictly separated data. Data separation is the most critical part of SaaS development. Broken access control ranks first in the OWASP Top 10:2025. Some form of broken access control appeared in 100% of the applications tested, according to OWASP. A SaaS platform multiplies the impact, because one bug can expose the data of every customer. There are three common models. First, a shared database with a tenant ID on every row. Second, a separate schema per tenant inside one database. Third, a separate database per tenant, which suits large customers with strict contracts. Row-Level Security adds a second safety net with PostgreSQL: the database itself restricts which rows each user can read or change. For example, a platform serving 200 companies should run automated tests before every release which deliberately try to read data from another tenant.
Which tech stack fits a SaaS platform?
The tech stack of a SaaS platform is the set of tools for the interface, server logic, data, hosting and payments. The standard stack at VirtuoLab in 2026 is React, Next.js, TypeScript, Node.js and PostgreSQL, with Docker and AWS for deployment. TypeScript catches type errors before deployment, which matters when one codebase serves every customer. PostgreSQL offers transactions, JSON columns and Row-Level Security in one open-source database. PostgreSQL is also mainstream: 55.6% of respondents had used PostgreSQL, according to the Stack Overflow Developer Survey 2025. For payments, Stripe and Mollie are the usual choices for Dutch founders. An iDEAL payment costs €0.29 according to Stripe, and Mollie lists €0.32 per iDEAL or Wero payment. For example, a B2B platform for German customers may need SEPA Direct Debit, while a Dutch consumer product mainly needs iDEAL. Finally, prefer proven open-source technology over niche frameworks, so hiring a second developer stays easy later on.
What does the GDPR require from a SaaS platform?
The GDPR treats a SaaS provider as a processor when the platform stores personal data on behalf of business customers. Processing by a processor must be governed by a contract per Article 28 GDPR, covering the subject, duration and purpose of the processing. In practice, compliance takes two steps. Step 1 is a standard data processing agreement listing security measures, data location and sub-processors such as AWS or Stripe. Step 2 is privacy by design: encrypted connections, role-based access, audit logs, data export and a deletion process per tenant. The stakes are real: fines can reach €20 million or 4% of total worldwide annual turnover, according to the European Commission. For example, a customer who cancels in 2026 should be able to download all records before deletion. Hosting inside the European Union, for example with Amazon Web Services in Frankfurt, keeps data transfers simple. Finally, a lawyer should review the final agreement.
How does VirtuoLab build a SaaS platform?
VirtuoLab is a software agency in Papendrecht which builds SaaS platforms in four steps. Step 1 is the intake and scope: a free first call, followed by a fixed price before any code is written. Step 2 is design and validation, with clickable screens tested with 5 to 10 users from the target group. Step 3 is building and testing in short sprints with Next.js and PostgreSQL, with a demo of working software after each sprint. Step 4 is launch and support, including monitoring, backups and further development. All code is written by VirtuoLab itself, so the founder talks directly with the developer instead of an account manager. After delivery, the client owns the source code and the data. For example, the CloudFlow concept on virtuolab.dev is an own demo of a SaaS dashboard with user management. In 2026, VirtuoLab works on location in the Drechtsteden and Rotterdam, and online across the Netherlands, Belgium and Germany.
Frequently asked questions
How long does it take to build a SaaS platform?
Building a complex web app or SaaS platform takes 12 to 24 weeks, according to VirtuoLab indications for 2026. An enterprise platform takes 24 weeks or more, while a focused SaaS MVP is faster. The lead time depends on three factors. First, the number of user roles and permissions. Second, integrations with external systems such as Exact Online, HubSpot or Google Workspace. Third, the speed of feedback from the founder during the sprints. For example, a platform with three user roles and one payment provider fits the shorter end of the range. Six roles plus links to Exact Online and HubSpot push the planning toward the longer end. In practice, quick decisions after each sprint demo keep the planning on track. VirtuoLab shares a planning together with the fixed price after the free intake call with VirtuoLab.
Should I start with an MVP or a full SaaS platform?
Most founders should start with a SaaS MVP, because an MVP tests demand before the full budget is spent. An MVP is the smallest version of the product which paying customers will actually use. Poor product-market fit was a cause in 43% of the startup shutdowns in a CB Insights report from March 2026. Running out of capital appeared in 70% of the same cases. First, a SaaS MVP from €15,000 includes sign-up, one core workflow and subscriptions. Second, the full platform at €30,000 to €80,000 makes sense once customers pay and ask for more. For example, team accounts or an API can follow in later sprints, after the first 20 customers have used the core workflow. The MVP architecture should already be multi-tenant with PostgreSQL, so growth does not require a rebuild. A fixed price per phase keeps each step predictable for the founder.
Who owns the code and the data of a SaaS platform?
Ownership at VirtuoLab is a fixed part of every proposal in 2026. The client owns the source code and the data of the SaaS platform, and every project built by VirtuoLab follows the same rule. With any developer, a few checks protect a SaaS founder. First, keep the code in a Git repository under your own account, for example with GitHub or GitLab. Second, register the domain name, the AWS account and the Stripe or Mollie account in the name of your own company. Third, ask for documentation of the setup and the deployment process. Fourth, make sure database backups land in storage which your company controls. Finally, arrange admin access to every production system before the first 10 customers sign up. A switch to another developer then stays a practical step instead of a crisis.