B2B Brochure Website Requirements Spec: 2026 Checklist

The verdict in three sentences

A costed requirements spec turns a guesswork quote into a comparable commitment: it narrows price gaps between agencies from 30 to 50 % down to a controlled order of magnitude. It must cover six blocks: scope, sitemap, integrations, content, SEO and recurring costs. Without it, you pay the risk margin the vendor adds out of caution.

The six blocks to frame and their budget

Here is the structure of a requirements spec for a B2B SME brochure site, with the 2026 order of magnitude per section (EUR excl. VAT).

A complete requirements spec runs 8 to 15 pages and takes 2 to 4 days to write. Many agencies offer this scoping workshop for 800 to 1,500 EUR excl. VAT, often deducted from the project if signed.

The functional requirements checklist

This table lists the requirements to decide explicitly to avoid costly change orders.

Every undecided line becomes a source of change orders. A mid-project change order costs on average 20 to 35 % more than the same feature planned from the start.

Mini case study

Thomas, sales director of a 45-employee industrial equipment supplier in Saint-Étienne, consults three agencies with no spec: he receives quotes at 5,900, 9,200 and 14,500 EUR excl. VAT, all incomparable. After writing an 11-page spec (12 pages, 2 languages, CRM-connected form, blog), the three quotes tighten to between 8,400 and 9,800 EUR excl. VAT. The scoping cost him 1,200 EUR excl. VAT but saved him from paying an overpriced quote by over 4,000 EUR and from two change orders estimated at 2,500 EUR.

FAQ

How long does it take to write a requirements spec? Between 2 and 4 days of actual work for a brochure site, spread over 1 to 2 weeks with internal back-and-forth. An agency-led scoping workshop cuts it to 3 days.

Is a requirements spec paid? The scoping workshop often costs 800 to 1,500 EUR excl. VAT, frequently deducted from the project if signed. The return on investment is almost immediate through comparable quotes.

What happens if I forget a feature? It becomes a change order, billed on average 20 to 35 % more than if it had been planned. Hence the value of an exhaustive functional checklist.

Should SEO be in the requirements spec? Yes: at minimum specify tags, the target speed (Core Web Vitals) and the 5 to 10 priority keywords. That represents 1,000 to 2,500 EUR excl. VAT of dedicated work at launch.

Can I reuse a generic template? Yes as a base, but each project must decide languages, templates and integrations. An unadapted template leaves open exactly the areas that move the quote by 30 to 50 %.

Let's scope your project. Send us your objectives and constraints, or start from a blank page: we run the scoping workshop and deliver a costed requirements spec. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.