The verdict in three sentences
An institutional B2B website ships in 12 to 18 weeks, not one month: underestimating the timeline is the leading cause of client-agency friction. The bottleneck is almost never development, but client-side content sign-off. Plan a buffer of 15 to 20 % and you will hold your product launch date.
The phase-by-phase schedule
Each phase produces validated deliverables that unlock the next. Skipping a sign-off saves no time: it just pushes the delay into testing.
| Phase | 2026 duration | Key deliverable |
|---|---|---|
| Scoping & workshops | 1 to 2 weeks | Refined brief, backlog |
| UX / wireframes | 2 to 3 weeks | Wireframes |
| UI / design | 2 to 3 weeks | High-fidelity mockups |
| Build & development | 4 to 6 weeks | Working templates |
| Content & migration | 2 to 3 weeks | Content in, 301s |
| Testing & fixes | 1 to 2 weeks | Signed acceptance |
UX and UI phases can partly overlap, but content and testing cannot be compressed without quality risk. A 20-30 page bilingual FR/EN site sits at the high end (16-18 weeks).
Delay factors and recommended buffers
Delays rarely come from the tech. Anticipate these factors and assign an owner to each sign-off.
| Delay factor | Typical impact | Countermeasure |
|---|---|---|
| Slow content sign-off | + 2 to 4 weeks | Firm internal deadlines |
| Content not provided | + 1 to 3 weeks | Copywriting delegated to agency |
| Multi-layer approval chain | + 1 to 2 weeks | One designated approver |
| Late translations | + 1 to 2 weeks | Start translation in UI phase |
| Complex SEO migration | + 1 week | Redirect audit upfront |
| Scope changes | Variable | Freeze scope after scoping |
Simple rule: add a 15 to 20 % buffer to the total and set the product launch date after testing ends, never on go-live day.
Mini case study
Sophie, communications director at a Paris consulting firm, must launch a bilingual site before a trade show on 15 September. The agency quotes 16 weeks. Counting backwards, work must start before end of May. Sophie names a single approver and has the agency write the EN content (estimated + EUR 3,500), saving the usual 3 weeks of scattered sign-off. Result: site live on 8 September, 7 days of buffer before the show. The copywriting cost prevented a slip that would have cost the show's visibility.
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FAQ
Can a B2B site be delivered in 6 weeks?
Yes for a 5-8 page brochure site on an existing template. For a 20-30 page institutional site, multilingual with integrations, plan 12 to 18 weeks: promising less is a red flag.
Which phase takes the longest?
Build/development (4-6 weeks) by volume, but the real bottleneck is client-side content sign-off, which can add 2 to 4 weeks if unmanaged.
How do I hold a fixed launch date?
Count backwards from the target date, add a 15-20 % buffer, name a single approver and freeze scope after scoping. Set launch after testing, not on go-live day.
Who should provide the content?
The client, unless explicitly delegated. Having the agency write it costs EUR 2,000-5,000 depending on volume but removes the main delay factor.
Should I plan a post-launch phase?
Yes: 2 to 4 weeks of warranty (fixes) then monthly maintenance. Real traffic reveals performance and content adjustments impossible to anticipate in testing.
Let's scope your project. You have a launch date to hold (trade show, product, campaign): give us the deadline and we build the schedule backwards with buffers and dated milestones. 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.
