Writing a website RFP for B2B in London in 2026

The verdict in three sentences

A precise RFP (request for proposal) is your best insurance against overruns: it turns a fuzzy intent into a quantifiable, enforceable scope. In 2026, a serious B2B RFP runs 8 to 15 pages, sets measurable objectives and a fixed scope, and acts as the contractual reference for every change order. Without one, the average budget drift observed is 30 to 60 percent, and timelines slip just as far.

What a 2026 RFP must contain

An RFP is not a feature list: it is a decision document. It aligns leadership, marketing and IT on the same objectives before the first pound is spent. The eight blocks below cover 95 percent of client-vendor disputes.

Budget and 2026 ranges

Stating a range in the RFP is not a weakness: it screens out off-target bids and saves three weeks of pointless talks. Here are 2026 orders of magnitude for a B2B website in the London market.

The cost of a well-written RFP (in-house or facilitated, a 1,500 to 3,500 EUR scoping workshop) pays for itself with the first change order avoided.

Mini case study

Julien, marketing lead at an industrial SME in Greater London, launches a redesign estimated at 15,000 EUR excl. VAT. Without an RFP, two prior vendors had drifted 40 percent, or 6,000 EUR in overrun and two months late. He invests 2,500 EUR in a scoping workshop producing a 12-page fixed-scope RFP. Result: three comparable quotes within 10 days, only an 8 percent gap between planned and invoiced, and an estimated net saving of 3,500 EUR on drift alone. The RFP also halved the sign-off round-trips.

FAQ

How long should an RFP be? In 2026, expect 8 to 15 pages for a standard B2B website. Below 5 pages the scope stays too vague; above 25 you slide into over-specification that freezes innovation.

Who should write the RFP, client or agency? Ideally the client sets objectives and constraints, then a scoping workshop with the agency (1,500-3,500 EUR) refines the specs. An RFP written entirely by the chosen vendor creates a conflict of interest over billable scope.

Should the budget appear in the RFP? Yes. A range (e.g. 8,000-14,000 EUR) screens out 60 percent of off-target bids and avoids comparing incomparable proposals. Hiding it stretches sourcing by 2 to 3 weeks.

How does an RFP prevent overruns? By fixing an explicit out-of-scope: anything not listed becomes a quoted, signed change order. That is what brings drift from 30-60 percent down to under 10 percent.

Is an RFP compatible with agile delivery? Yes: the RFP fixes objectives and a budget cap, agile handles backlog prioritisation. You get scope fixed on budget, variable on feature detail.

Let's scope your project. Send us your objectives and budget range, and we will structure your RFP and price the scope. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.