The verdict in three sentences
Choosing a B2B web agency on price alone is the leading cause of failed projects: a bad vendor costs 8,000 to 20,000 EUR in rework and 3 to 6 months lost. Price should weigh only 30% of your decision; the rest comes down to sector references, guaranteed support, GDPR compliance and code reversibility. This guide weights the 10 criteria that truly matter in 2026, with market day rates of 400 to 750 EUR.
The 10 weighted criteria
A B2B decision is secured with a grid, not a gut feeling. Here are the ten criteria and their recommended weight, tested on real tenders.
| Criterion | Weight | What to check |
|---|---|---|
| Sector references | 18% | 2-3 comparable cases delivered |
| Technical stack | 12% | Next.js/Webflow, longevity |
| Guaranteed support | 12% | contract, response times |
| Code reversibility | 10% | code assigned, Git repo access |
| GDPR/EU compliance | 10% | EU hosting, signed DPA |
| Contractual timelines | 10% | milestones + penalties |
| Price at equal scope | 10% | normalised, day rate 400-750 EUR |
| Project methodology | 8% | sprints, UAT, weekly check-ins |
| Financial soundness | 5% | tenure, bank references |
| Relationship & responsiveness | 5% | dedicated contact |
Give each criterion a 0-5 score, multiply by the weight, and compare totals. The candidate with the best overall score, not the cheapest, is the right one.
The hidden cost of a bad choice
The risk is not theoretical: fixing a poorly built site often costs more than rebuilding it. Here are the cost lines of a bad vendor, 2026 ballparks.
| Rework line | Estimated 2026 cost | Timeline |
|---|---|---|
| Audit + code takeover | 3,000 to 8,000 EUR | 2 to 4 weeks |
| Partial design rebuild | 2,500 to 6,000 EUR | 3 to 5 weeks |
| Re-migration/EU hosting | 1,500 to 4,000 EUR | 1 to 2 weeks |
| Lost SEO recovery | 1,000 to 3,000 EUR/month | 3 to 6 months |
| Business disruption | variable | 3 to 6 months |
| Typical total | 8,000 to 20,000 EUR | 3 to 6 months |
An agency that refuses to assign the code or host in the EU exposes you directly to these lines. That is why reversibility and GDPR together weigh 20%.
Mini case study
Claire, CFO of an industrial SME in Dublin, must approve an agency choice for a 19,000 EUR website. She applies the grid to three candidates. The cheapest agency (15,500 EUR) drops out due to vague support and non-assigned code; the median agency scores best overall despite a 19,000 EUR price. On her previous project, a price-only choice cost her 12,000 EUR in rework and 4 months of delay. By weighting, she accepts an apparent extra 3,500 EUR against a quantified risk of 12,000 EUR: the risk/cost ratio clearly favours the median agency.
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FAQ
Should price be the first criterion?
No. Price should weigh at most 30%. Sector references, guaranteed support and code reversibility protect your investment better than a low day rate.
Why is code reversibility so important?
Because without code assignment and Git repo access, you are locked to your vendor. Switching agencies then costs 3,000 to 8,000 EUR in rework just to regain control.
How much does a bad vendor choice cost?
Between 8,000 and 20,000 EUR in rework, plus 3 to 6 months lost and eroded SEO rankings. It is often more expensive than paying the solid agency from the start.
Should you require EU hosting?
Yes for a GDPR-bound B2B project. Require EU hosting and a signed DPA: it avoids a later re-migration at 1,500 to 4,000 EUR and secures compliance.
How many sector references should you ask for?
Two to three comparable delivered cases are enough. Check they are live, recent and in a sector close to yours: it is the best predictor of success.
Let's scope your project. Tell us your sector and requirements (GDPR, support, reversibility): we respond with references and a clear contract. 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.
