The verdict in three sentences
A web project timeline depends less on engineering than on your availability to validate. In 2026, budget 6 to 10 weeks for a brochure site, 3 to 4 months for a corporate site, 4 to 9 months for a business app. The number one cause of slippage remains content validation: neutralizing it with weekly milestones cuts the delay risk in half.
The typical phasing of a web project
Each phase produces a deliverable that gates the next. Skipping a step saves no time: it is paid back later, during QA.
| Phase | Duration (brochure) | Deliverable | Client sign-off required |
|---|---|---|---|
| Scoping | 1-2 wks | Specs, sitemap | Yes, blocking |
| UI design | 2-4 wks | Approved mockups | Yes, blocking |
| Development | 4-10 wks | Working site in staging | Weekly checkpoints |
| QA | 1-2 wks | Acceptance report | Yes, blocking |
| Go-live | 2-5 days | Site in production | Go/No-go |
A brochure site thus totals 6 to 10 calendar weeks; phases partially overlap (design starts as scoping wraps up).
2026 timeline benchmarks and slippage factors
Durations vary with complexity. Here are 2026 orders of magnitude by project type.
| Project type | Realistic timeline | Top delay cause | Typical schedule overrun |
|---|---|---|---|
| 5-10 page brochure | 6-10 weeks | Content not supplied | +30% |
| Corporate site | 3-4 months | Multi-team sign-off chain | +40% |
| E-commerce | 2-4 months | Product data, catalog | +25% |
| Business app | 4-9 months | Third-party integrations | +35% |
| SEO rebuild | 3-5 months | URL migration, redirects | +20% |
The three recurring slippage factors: content validation (cause number one), client-side unavailability, and third-party integrations (payment, CRM, ERP) dependent on external partners.
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Mini case study
Thomas, marketing director of an industrial SME in Toulouse, wants his new corporate site live in 3 months for a trade show. The vendor quotes a realistic 14-week timeline with weekly milestones. Thomas assigns an internal content owner from week 1: all 12 pages of copy are ready by the end of scoping, instead of trickling in. Result: zero blockage on the top delay cause. On a project where the +40% corporate overrun would have added 5.6 weeks, validation discipline limits slippage to a single week. The site goes live 4 days before the show, safety margin included.
FAQ
Why does a brochure site take 6 to 10 weeks and not 2? Because scoping, design, development and QA chain together with blocking sign-offs. The two weeks some promise only cover a hastily filled template, with no SEO or serious QA.
Who causes most delays, the agency or the client? The client, in 60 to 70% of cases, through late content and slow approvals. A shared schedule with committed sign-off dates rebalances responsibility.
Can a web project be accelerated? Yes, by pre-validating content before scoping, appointing a single client-side decision maker, and paying for a dedicated sprint. You rarely gain more than 20 to 25% without degrading quality.
What does the QA phase cover? Functional tests, browser and mobile compatibility, performance, accessibility, technical SEO. Budget 1 to 2 weeks: skipping it makes post-launch fixes explode, at far higher cost.
Are weekly checkpoints necessary? Yes. A 30-minute weekly review catches blockers early and cuts delay risk by roughly 50%. Without a tracking ritual, problems surface too late, at project end.
Let's scope your project. Give us your target date, site type and content volume: we build a milestone-based schedule with weekly sign-off checkpoints. 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.
