The verdict in three sentences
A redesign project is won or lost in the contract, not at the design stage. The three major risks for a decision maker are code ownership, SEO loss during migration and timeline slippage: each is neutralised by a precise, costed clause. This 12-clause checklist, with 2026 indicative costs, turns a risky signature into a controlled commitment.
The 12 clauses to demand and their cost
Each clause has a concrete financial impact. Here is the 2026 reference grid.
| # | Clause | What it protects | 2026 order of magnitude |
|---|---|---|---|
| 1 | Full transfer of sources | Code ownership | Included (put it in writing) |
| 2 | Late-delivery penalty | Timeline compliance | 2%/week of the amount |
| 3 | Exhaustive 301 redirects | Existing SEO | ~25% of traffic preserved |
| 4 | Post-launch warranty | Bugs after go-live | 90 days included |
| 5 | Detailed maintenance | Predictable upkeep | 4 - 8% of project/year |
| 6 | Backups & restore | Continuity | 45 EUR/month hosting |
| 7 | Accessibility WCAG/AODA | Legal compliance | 1 500 - 3 000 EUR |
| 8 | Formal acceptance (sign-off) | Objective validation | Included |
| 9 | Training & documentation | Team autonomy | 900 EUR |
| 10 | Privacy & legal notices | Data compliance | 800 - 1 500 EUR |
| 11 | Guaranteed performance (Lighthouse) | Measurable quality | Target > 90 in contract |
| 12 | Reversibility / data export | Lock-in-free exit | Included |
The most forgotten clause is #1: without an explicit transfer of sources, you are renting your site without knowing it. The most profitable is #3: exhaustive 301 redirects avoid a traffic drop of up to 25% after migration.
What each clause earns you
A solid contract is not a cost, it is a quantifiable insurance. Here is the impact of the key clauses.
| Risk without clause | Costed consequence | Clause that prevents it |
|---|---|---|
| Code not transferred | 3 000 - 8 000 EUR buy-back to migrate | Clause 1 |
| 6-week delay | Lost revenue + tension | Clause 2 (2%/week penalty) |
| Migration without 301 | -25% organic traffic | Clause 3 |
| Post-launch bugs | Billed separately, no warranty | Clause 4 (90 days) |
| Uncosted maintenance | Billing drift | Clause 5 |
Mini case study
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Sophie, manager of an engineering consultancy in Toronto, is about to sign a 16 000 EUR redesign. The quote mentions neither source transfer, nor 301 redirects, nor a late penalty. She demands the 12 clauses be added.
Concrete benefit: clause 3 (301) preserves her organic traffic worth about 1,800 visitors/month. Without it, a 25% loss would cost her 450 visitors/month; at 2.4% conversion and 6 000 EUR of margin per deal, that is about 1.3 lost deals per month, nearly 8 000 EUR of monthly margin. Clause 2 (2%/week penalty, i.e. 320 EUR/week) disciplines the schedule. Adding these clauses cost nothing extra: they were within scope, they just had to be written down. The secured contract protects a 16 000 EUR asset and a far more valuable sales channel.
FAQ
Is source transfer automatic? No. Without an explicit clause, the vendor may retain rights over the code. Demand a full written transfer: it is free to negotiate before signing, costly to buy back after.
What late penalty is reasonable? Around 2% of the amount per week of delay, capped (often at 10-15%). It is not punitive: it aligns interests and protects your commercial calendar.
Why are 301 redirects critical? Because a redesign changes URLs. Without exhaustive 301s, Google loses the link to your old pages and traffic drops up to 25%. It is the clause with the best protection-to-cost ratio.
What warranty duration should I demand? 90 days minimum after go-live, covering bug fixes at no extra charge. Beyond that, maintenance (4 to 8% of the project per year) takes over.
Should a Lighthouse target be in the contract? Yes: a measurable "guaranteed above 90" performance avoids slow deliverables. It is an objective acceptance criterion, not a vague promise.
Let's scope your project. Send us your quote or your draft contract, with your budget and target timeline, and we will validate the 12 clauses together before signing. 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.
