The verdict in three sentences
Reselling software as white label to dozens of resellers requires a multi-tenant architecture designed from day one: running one instance per customer becomes unmanageable beyond 10 to 15 installations. The budget sits between EUR 50,000 and 120,000 (USD 54,000 to 130,000) for 5 to 7 months of work, depending on the level of data isolation and depth of customisation. Done well, the platform brings infrastructure cost down to EUR 0.5 to 2 per end customer per month, which makes the reseller model highly profitable.
Three data isolation models
The isolation model drives cost, security and ease of maintenance. Decide it before writing any code.
| Model | Principle | Build cost | Infrastructure per customer/month | Best for |
|---|---|---|---|---|
| Shared database, shared schema | tenant_id column + row-level security (RLS) | Lowest | EUR 0.5 to 1 | SMBs, high volumes of small customers |
| Shared database, schema per tenant | One PostgreSQL schema per reseller | Medium | EUR 1 to 1.5 | Resellers with sensitive data |
| Dedicated database per tenant | One database per reseller, shared code | Highest | EUR 1.5 to 2 and up | Healthcare, finance, enterprise |
| Hybrid | Shared by default, dedicated as a paid option | Medium to high | EUR 0.5 to 2 | Tiered pricing offers |
| Instance per customer (avoid) | A full copy of the application | Low at first | EUR 15 to 60 | Fewer than 10 customers only |
For most reseller projects, the shared schema with RLS model is enough, with a dedicated database option sold at a premium to demanding resellers.
Detailed budget for a white-label platform
White label adds specific building blocks on top of the software's functional core. Here is a 2026 ballpark breakdown.
| Building block | Scope | 2026 budget |
|---|---|---|
| Multi-tenant foundation | Tenant resolution, isolation, RLS, leak tests | EUR 12,000 to 25,000 |
| Custom domains | app.reseller.com, automatic SSL certificates | EUR 5,000 to 10,000 |
| Per-reseller themes | Logo, colours, branded emails and PDFs | EUR 6,000 to 14,000 |
| Per-tenant billing | Stripe subscriptions, tiers, usage, revenue share | EUR 8,000 to 20,000 |
| Reseller console | Customer management, permissions, analytics | EUR 9,000 to 22,000 |
| Vendor console | Oversight of 40 resellers, limits, support | EUR 6,000 to 15,000 |
| Security and compliance | Audit log, per-tenant GDPR export, backups | EUR 4,000 to 14,000 |
The 5 to 7 month timeline includes a pilot with 3 resellers before opening to the other 37. Budget 15 to 20 % of the initial build per year for evolutive maintenance.
Costly mistakes to avoid
The most common one is forgetting the tenant_id in a query: a single data leak between two resellers can cost a contract and a regulatory breach notification. Automated leak tests must run on every deployment. Second mistake: hard-coding colours and copy, which forces a redeploy for every new reseller. Third mistake: neglecting per-tenant limits (users, storage, API calls), without which one large reseller degrades service for everyone else.
Mini case study
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Daniel, CEO of a construction management software vendor in Toronto, wants to sign 40 regional resellers, each with about 50 customers, or 2,000 end customers. The multi-tenant platform is quoted at EUR 95,000 over 6 months. Each reseller pays EUR 450 a month in licence fees, or EUR 216,000 a year once all 40 are live. Infrastructure costs about EUR 1 per customer per month (EUR 24,000 a year) and maintenance EUR 17,000 a year. Net annual margin reaches EUR 175,000, which pays back the build in 7 months at full load, and in 12 to 15 months with a gradual reseller ramp-up.
FAQ
How much does a white-label multi-tenant SaaS cost to build?
The 2026 ballpark is EUR 50,000 to 120,000 depending on isolation model and depth of customisation. A foundation with custom domains and themes starts around EUR 50,000.
Can existing software be converted to multi-tenant?
Yes, but reworking the data model often accounts for 30 to 50 % of the budget. A 5 to 10 day audit helps choose between adaptation and partial rewrite.
What is the hosting cost per customer?
With a shared database and RLS isolation, allow EUR 0.5 to 1 per end customer per month. A dedicated database per reseller raises that to EUR 1.5 to 2 and more.
Can each reseller have its own domain?
Yes, custom domains with automatic SSL certificates cost EUR 5,000 to 10,000 to build. The reseller adds one DNS record and the domain is live in under an hour.
How do we guarantee no data leaks between resellers?
Through database-level security rules (RLS) and automated leak tests on every deployment. This work represents 10 to 15 % of the budget and should never be cut.
Let's scope your project. Describe your software, target reseller count and isolation requirements: we will price a multi-tenant platform between EUR 50,000 and 120,000 with a 5 to 7 month 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.
