The verdict in three sentences
A technical due diligence before acquisition is budgeted between EUR 6,000 and 25,000 in 2026, over 1 to 4 weeks. It quantifies technical debt and remediation cost, surfaces security, GDPR and scalability risks, and can move valuation by -10 to -30%. Next to a six- or seven-figure cheque, it's the best-ratio investment in the deal.
Express audit or deep due diligence
| Criterion | Express audit | Deep due diligence |
|---|---|---|
| Budget | EUR 6,000–12,000 | EUR 12,000–25,000 |
| Duration | 1–2 weeks | 2–4 weeks |
| Expert day rate | EUR 700–900 | EUR 700–900 |
| Code review | sample | full + tests |
| Security / GDPR | checklist | detailed audit |
| Scalability / infra | overview | load & projected costs |
| Deliverable | summary note | report + risk matrix |
An express audit suffices for a small ticket or first pass. For a significant acquisition, deep due diligence secures the decision and arms the negotiation.
What the audit reveals and its impact
| Audited dimension | Typical risk | Valuation impact |
|---|---|---|
| Technical debt | six-figure remediation | -10 to -30% |
| Security | critical vulnerabilities | warranty clause |
| GDPR compliance | non-compliant data | provision / legal risk |
| Scalability | runaway cloud costs | plan adjustment |
| Bus factor / docs | dependence on 1 dev | continuity risk |
| Tests & CI/CD | no safety net | post-deal overrun |
The delivered report includes a technical-debt score, a costed remediation estimate and a prioritized risk matrix. These become concrete negotiation levers: a remediation estimated at EUR 120,000 justifies an equivalent discount or a warranty clause.
Mini case study
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Élodie, acquirer of a SaaS startup in Amsterdam, is about to sign at EUR 1,400,000. She commissions a deep due diligence at EUR 18,000. The audit reveals technical debt estimated at EUR 180,000 of remediation and a GDPR non-compliance. She negotiates a 15% discount (EUR 210,000) and a warranty clause on the compliance fix. For EUR 18,000 invested, she secures over EUR 210,000 and avoids a legal liability. Return ratio above 11.
FAQ
How much does technical due diligence cost in 2026? Between EUR 6,000 and 25,000 depending on depth and target size. An expert auditor's day rate sits between EUR 700 and 900.
How long does the audit take? From 1 to 4 weeks depending on scope. An express audit wraps in 1 to 2 weeks, a full due diligence in 2 to 4.
Can the audit really lower the price? Yes: by costing remediation and risks, it justifies a discount of -10 to -30% or warranty clauses. It's a negotiation tool, not just reassurance.
What are the concrete deliverables? A report with technical-debt scoring, remediation cost, security/GDPR/scalability review, and a prioritized risk matrix usable in negotiation.
Should I audit even a small acquisition? Yes, at minimum an express audit at EUR 6,000–12,000. The cost is marginal against the risk of buying invisible debt.
Let's scope your project. Tell us the target's stack, the deal size and your deadline: we'll frame an express or deep audit with deliverables and a risk matrix. 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.
