The verdict in three sentences
A B2B web agency is not chosen on headline price but on code ownership, clarity of acceptance testing and the strength of the maintenance contract. In London in 2026, day rates run from 450 to 750 EUR depending on seniority, and a vague quote under 400 EUR/day almost always hides unmanaged offshore work. Score three agency profiles across ten weighted criteria and the best value-to-risk ratio shows up on a single page.
The 10 criteria that truly matter
A leader steering a 20,000 to 60,000 EUR budget must grade every agency on the same axes. Here is the 2026 weighting grid, where price counts for only 15 %.
| Criterion | Weight | What you check |
|---|---|---|
| Sector references | 15 % | 3 comparable B2B cases, reachable |
| Code ownership | 15 % | Full transfer, Git repo handed over |
| Acceptance testing | 12 % | Test plan, documented tests |
| Maintenance & exit | 12 % | Contract, SLA, exit clause |
| Price / day rate | 15 % | 450-750 EUR, itemised quote |
| GDPR compliance | 10 % | DPA, EU hosting, cookies |
| Timeline & method | 8 % | Milestoned plan, sprints |
| Accessibility | 6 % | WCAG AA target |
| Stack longevity | 4 % | Maintained tech, no niche |
| Responsiveness | 3 % | Single point of contact |
A weighted score above 75/100 qualifies the agency for the short-list. Below 55, drop it without negotiating.
Comparing three agency profiles
The 2026 London market splits into three families with very different price and risk logics.
| Profile | Day rate 2026 | Brochure site budget | Strength | Main risk |
|---|---|---|---|---|
| Freelance / studio | 350-500 EUR | 8,000-18,000 EUR | Price, agility | Bus factor, leave |
| Independent agency | 500-700 EUR | 18,000-45,000 EUR | Balance, follow-up | Limited capacity |
| Group agency | 650-900 EUR | 40,000-120,000 EUR | Solidity, WCAG | Cost, slowness |
| Generalist consultancy | 550-750 EUR | 30,000-90,000 EUR | Resources | Team turnover |
| Managed offshore | 250-400 EUR | 6,000-20,000 EUR | Raw cost | Testing, GDPR |
For a 15-to-30-page B2B corporate site, the independent agency offers the best 2026 trade-off: a senior contact, a clear maintenance plan and controlled scope creep.
Red flags you must never ignore
A quote with no acceptance-testing line, no written code transfer, a deposit above 40 %, or a project manager unreachable after the sale: each of these doubles the project failure risk. Always require a separate maintenance contract, an exit clause (handover of access and the Git repo) and an acceptance test plan signed off before go-live.
Mini case study
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Thomas, managing director of a 45-employee industrial SME in London, must rebuild his corporate site. He gets three offers: freelance at 12,000 EUR, independent agency at 28,000 EUR, group agency at 52,000 EUR. Applying the weighted grid, the freelance drops out (bus factor, no maintenance), the group agency stalls (price, 8-month timeline). The independent agency scores 82/100. Over three years, adding maintenance of 350 EUR/month, or 12,600 EUR, total cost is 40,600 EUR versus 52,000 EUR for the group agency's build alone excluding maintenance. A 22 % saving over three years and half the project risk.
FAQ
What budget should I plan for a serious B2B site in London in 2026?
Budget 18,000 to 45,000 EUR for a 15-to-30-page corporate site with an independent agency. Below 10,000 EUR, testing and code ownership are almost always sacrificed.
Do I automatically own the source code?
No. Without an explicit transfer clause, the agency keeps the economic rights. Require a full transfer and handover of the Git repo: it is a 15 % criterion in our grid.
How much does maintenance cost after delivery?
A reasonable plan runs 200 to 600 EUR/month depending on included hours and SLA. A site with no maintenance sees its security-breach risk rise sharply from year one.
How do I spot hidden offshore subcontracting?
A day rate under 400 EUR for custom work, shifted meeting slots and a quote with no named team member are the three most reliable signals. Ask who codes, where, and under which GDPR contract.
Do I need a formal RFP?
Above 25,000 EUR, yes: a brief and a weighted scorecard avoid 20 to 40 % of budget drift and make the decision defensible to your board.
Let's scope your project. Tell us your scope (number of pages, languages, maintenance needs) and indicative budget, and we send back a scoring grid and a 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.
