The verdict in three sentences
Modernizing a legacy VB6/Access system to the web costs between CAD 90,000 and CAD 220,000 in 2026, data migration and API included, over 6 to 12 months. The real comparison isn't price versus zero, but modernization cost versus status-quo cost: outages, single-developer dependency, compliance gaps and the inability to open web access. For a mid-market firm, refactoring ROI typically materializes over 3 years through fewer incidents and recovered productivity.
The price of modernization in 2026
Cost tracks the volume of business rules to re-encode and the quality of historical data to migrate.
| Scope | Price CAD | Timeline | Contents |
|---|---|---|---|
| Simple rewrite | 90,000 - 125,000 | 6-8 months | Web rewrite, data migration, auth |
| Standard mid-market | 125,000 - 175,000 | 8-10 months | + API, fine-grained roles, workflow |
| Complex | 175,000 - 220,000 | 10-12 months | + ERP integrations, multi-site, reporting |
Maintenance for a critical app runs between CAD 1,200 and CAD 2,200/month in 2026, depending on SLAs and user volume.
The hidden cost of legacy
Keeping an Access/VB6 system looks free. Here is the real 3-year bill for a 120-employee firm.
| Risk item | Estimated annual cost | Over 3 years |
|---|---|---|
| Outages and production stops | 26,000 CAD | 78,000 CAD |
| Single-developer dependency | 18,000 CAD | 54,000 CAD |
| Compliance gap (risk/audit) | 15,000 CAD | 45,000 CAD |
| Re-keying and workarounds | 22,000 CAD | 66,000 CAD |
| Status-quo total | 81,000 CAD | 243,000 CAD |
A CAD 160,000 rewrite amortized over 3 years (~CAD 53,000/year) costs less than the CAD 81,000/year status quo, while removing the total-stop risk the day your last VB6 expert leaves.
Mini case study
Michael, CIO of a 120-employee industrial firm in Toronto, depends on a 2009 Access app maintained by a single contractor nearing retirement. In 2025, two outages halted production for 11 cumulative hours, roughly CAD 32,000 lost. He launches a CAD 158,000 web rewrite over 9 months: migration of 15 years of data, ERP API, compliance. From year one post go-live: zero downtime, single-contractor dependency gone, and 2 regulatory exports automated. Full ROI reached in 34 months.
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FAQ
Can 15 years of Access data be migrated?
Yes, it's a project workstream in its own right. Budget 3-6 weeks of migration, cleaning and validation depending on data quality. A poorly structured database can add 10-20% to the budget.
Rewrite all at once or in phases?
A phased approach (strangler pattern) reduces risk: you replace module by module while keeping the old system running in parallel. It lengthens the timeline but protects production.
How do we handle legacy compliance gaps?
The rewrite is the chance to build in encryption, access traceability and consent management natively, sharply cutting fine risk and easing any audit.
What maintenance budget after the rewrite?
Between CAD 1,200 and CAD 2,200/month in 2026 for a critical app, depending on SLAs (availability, recovery time) and user count.
How long without service interruption?
With a prepared cutover and a 2-4 week dual-run period, real interruption usually shrinks to a single migration weekend.
Let's scope your project. Describe your current system, data volume and ERP integrations: we frame a rewrite between CAD 90,000 and 220,000 over 6-12 months. 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.
