The verdict in three sentences
Moving from software installed at 30 clients to a multi-tenant SaaS platform costs, as a 2026 order of magnitude, 120,000 to 300,000 SGD in Singapore (about 90,000 to 225,000 USD), over 5 to 9 months. The structural choice is data isolation: shared schema with a tenant key, schema per tenant or database per tenant, which drives hosting cost, security and how easily you sell to enterprise accounts. Grant support such as the Enterprise Development Grant and well-designed Stripe billing turn this project into a profitable recurring-revenue investment.
Why go multi-tenant
The founder of a Singapore software vendor serving engineering inspection firms currently runs 30 installations, each with its own version, server and hand-applied patches. Each update takes a consultant half a day per client, 15 days per release. Multi-tenancy puts every client on a single codebase, deployed once, with separated data.
| Isolation model | Principle | Hosting cost | Perceived security | Use case |
|---|---|---|---|---|
| Shared database, tenant_id column | All data in the same tables | Lowest | Good with Row Level Security | SMBs, many small clients |
| Schema per tenant | One database, one PostgreSQL schema per client | Medium | Very good | 20 to 500 mid-size clients |
| Database per tenant | One dedicated database per client | High | Maximum | Enterprise, healthcare, finance |
| Hybrid | Shared by default, dedicated for premium | Variable | Matched to contract | Vendor with enterprise tier |
| Fully dedicated instance | App and database isolated | Very high | Maximum | Rare contractual requirement |
For 30 legacy clients and an ambition to sign 200, schema per tenant or hybrid is often the best compromise.
The budget line by line
| Component | Content | 2026 budget | Share of total |
|---|---|---|---|
| Architecture rework and multi-tenancy | Isolation, per-tenant migrations, configuration | 36,000 to 90,000 SGD | 30% |
| Authentication and SSO | Accounts, roles, SAML or OIDC (Microsoft Entra, Google) | 12,000 to 30,000 SGD | 10% |
| Stripe subscription billing | Plans, trials, seats, invoices, dunning | 15,000 to 36,000 SGD | 12% |
| Vendor admin console | Tenant creation, support, metrics | 12,000 to 30,000 SGD | 10% |
| Migration of the 30 clients | Migration scripts, per-client acceptance | 18,000 to 45,000 SGD | 15% |
| Observability, security, PDPA | Logs, alerts, backups, pentest | 15,000 to 39,000 SGD | 13% |
| Infrastructure as code and CI/CD | Automated deployment, environments | 12,000 to 30,000 SGD | 10% |
| Production hosting | AWS or Azure Singapore region, managed DB | 600 to 3,500 SGD per month | Recurring |
Hosting in a Singapore cloud region simplifies client security questionnaires and PDPA compliance. Budget 600 SGD a month at launch and 3,500 SGD beyond 150 active clients with high availability.
Funding and business model
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New product development may qualify for the Enterprise Development Grant, which in 2026 can cover up to 50% of eligible costs for qualifying SMEs, to confirm with Enterprise Singapore. On 220,000 SGD of eligible costs, 50% support represents up to 110,000 SGD. On the revenue side, moving from a 18,000 SGD licence plus 18% maintenance to a 1,000 SGD monthly subscription smooths cash flow and often raises company value, since recurring revenue is valued at 4 to 8 times ARR depending on growth.
Mini case study
Wei Ling runs a 14-person software vendor in Singapore. Her 30 clients pay on average 3,600 SGD of yearly maintenance, 108,000 SGD of recurring revenue. Manual deployments consume 60 consultant days a year at 800 SGD cost, 48,000 SGD. She budgets 210,000 SGD, reduced to about 126,000 SGD after a 40% grant, plus 18,000 SGD of yearly hosting. As SaaS at 880 SGD a month, her 30 clients generate 316,800 SGD a year. The revenue uplift and 48,000 SGD saved cover the investment in under 12 months.
FAQ
Do we need a full rewrite? Rarely. In 60 to 70% of cases the business core is kept and the data layer, authentication and deployment are rebuilt.
How long to migrate existing clients? Budget 1 to 3 days per client, grouped in waves of 5. Migrating 30 clients takes about 2 months.
Is SSO essential? To sell to companies with more than 200 staff, yes in 80% of tenders. It adds 12,000 to 30,000 SGD.
Does Stripe handle GST and overseas taxes? Yes, Stripe Tax calculates tax by country for about 0.5% of the billed amount. Card fees in Singapore are around 3.4% plus 0.50 SGD.
What is a realistic timeline? 5 months for a simple shared-database product, 9 months with SSO, hybrid isolation and 30 client migrations. A first commercial version can ship in month 4.
Let's scope your project. Describe your current software, client base and security requirements, and we will price the multi-tenant architecture, billing and migration with a phased plan. 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.