The verdict in three sentences
A vague project brief (RFP) guarantees you incomparable quotes, with gaps of 40 to 60 % that reflect nothing but each agency's interpretation. A brief structured around seven sections (objectives, audiences, sitemap, features, SEO, performance, timeline) turns your shortlist into a rational comparison. Budget 1 to 3 weeks of internal writing, or 1,500 to 4,000 EUR if you get expert help.
The seven sections of a brief that holds up
A good brief is not a novel: it is an 8-to-20-page document that scopes the project without dictating the technical solution. Here is the structure we recommend to our B2B SME clients in 2026.
| Section | Expected content | Level of detail | Common mistake |
|---|---|---|---|
| Context & objectives | Market, competitors, target KPIs | Figures (e.g. +30 % leads) | Staying vague on the "why" |
| Audiences & personas | 2-3 personas, typical journey | Specific, with needs | Forgetting influencers |
| Sitemap | Site plan, sections | Full schema | Underestimating depth |
| Features | Forms, client area, multilingual | Prioritised list (must/nice) | Marking everything "must" |
| SEO & content | Keywords, article volume | Number of pages to write | Ignoring SEO migration |
| Performance & technical | Core Web Vitals, hosting, GDPR | Measurable targets | No performance criteria |
| Timeline & budget | Deadline, milestones | Realistic due date | Unrealistic timeline |
The "level of detail" column is the most neglected: a feature written as "client area" can cost anywhere from 3,000 to 25,000 EUR depending on whether it is a simple document download or a portal with billing.
Should you disclose your budget? And what does the brief cost?
The debate resurfaces with every consultation. Announcing a budget range steers proposals toward your reality and avoids back-and-forth; hiding it protects you from an artificial upward alignment of prices. Our stance in 2026: give a wide range (e.g. "20,000 to 35,000 EUR") but keep the detail for negotiation.
| Approach | Observed quote gap | Consultation time | Recommended for |
|---|---|---|---|
| No brief, oral pitch | 60-120 % | 4-8 weeks | Not advised |
| Light brief (3-5 pages) | 40-60 % | 3-5 weeks | Small showcase site |
| Full brief (10-20 pages) | 15-25 % | 2-4 weeks | Structured B2B SME |
| Brief + disclosed budget | 10-15 % | 2-3 weeks | Scoped project |
| Expert engagement | < 10 % | 2 weeks | Strategic stakes |
A brief-writing engagement costs 1,500 to 4,000 EUR depending on complexity; that cost is almost always recovered through reduced gaps and misunderstandings during production.
Mini case study
Elodie, marketing manager at a 45-person industrial SME in Lille, consults four agencies without a brief. She receives quotes of 14,000, 22,000, 31,000 and 48,000 EUR: impossible to compare. She invests 2,800 EUR in help writing a 14-page brief, then re-consults. The new quotes come in at 24,000, 26,500, 27,000 and 29,500 EUR: a gap narrowed to 23 %. She negotiates the best value at 25,000 EUR and avoids an estimated 6,000 EUR overrun on poorly scoped features. ROI on the engagement: roughly 3x at signing.
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FAQ
How long does it take to write a brief?
Budget 1 to 3 weeks depending on stakeholder availability. A half-day scoping workshop greatly speeds up needs gathering.
Should the brief describe the technical solution?
No. Describe the need and the constraints (GDPR, EU hosting, performance) and let agencies propose the stack. That way you compare approaches, not frozen quotes.
What does a writing engagement cost?
Between 1,500 and 4,000 EUR in 2026, depending on the number of workshops and project size. That order of magnitude usually includes the sitemap and the evaluation grid.
How many agencies should I consult?
Three to five is the sweet spot. Beyond that, the time to analyse offers outweighs the gain, and the best agencies decline overly broad consultations.
Is the brief legally binding?
Annexed to the contract, it becomes the contractual reference for scope. Any request outside the brief is then a priced change order, which protects you from budget creep.
Let's scope your project. Tell us your sector, your deadline and an indicative budget range, and we will draft a consultation-ready brief together. 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.
