The verdict in three sentences
Redesigning a 2019 B2B site in London costs between GBP 10,000 and GBP 28,000 in 2026 depending on the scope of work. The real risk of a redesign isn't the price, it's losing your SEO for want of clean redirects. A well-run redesign improves Core Web Vitals and conversion rate: it's an investment, not a cosmetic expense.
The line-by-line pricing
Here are the 2026 ranges for a B2B redesign in London, before VAT at 20 %.
| Line item | Range ex-VAT | Role |
|---|---|---|
| Technical & SEO audit | GBP 1,400 - 3,500 | Performance, content, indexing diagnosis |
| Design rebuild | GBP 6,000 - 17,000 | New identity, UX, responsive |
| Content migration | GBP 1,800 - 5,500 | Page reuse, images, restructuring |
| SEO redirects (301) | GBP 900 - 2,200 | Preserving acquired ranking |
| CWV optimisation | GBP 900 - 3,300 | LCP, CLS, INP, images, cache |
| QA & testing | GBP 700 - 2,200 | Cross-browser, mobile, accessibility |
A full redesign therefore lands between GBP 10,000 and GBP 28,000 depending on whether the design is reworked lightly or entirely rethought.
Before / after: what the redesign really changes
A 2019 site accumulates technical debt and slowness; here are the typical gains measured in 2026.
| Metric | Before (2019 site) | After redesign | Impact |
|---|---|---|---|
| LCP (load) | 4.2 s | 1.8 s | -57 % |
| CLS (stability) | 0.28 | 0.04 | Compliant |
| Mobile score | 42/100 | 90+/100 | Improved SEO |
| Bounce rate | 68 % | 48 % | -20 pts |
| Conversion rate | baseline | +15 to 30 % | More leads |
| Delivery time | - | 6-12 weeks | - |
The 15-to-30 % conversion uplift is the central argument: on a site that generates quote requests, a few points are enough to repay the redesign.
Mini case study
Sophie, digital lead at a 90-employee manufacturer in London, redesigns a 2019 site loading in 4.2 s. Chosen quote: GBP 15,000 ex-VAT (18,000 inc. VAT), delivered in 9 weeks. Her site generates 300 contact requests a year at a 2 % conversion rate. Moving to 2.5 % (+25 %) lifts requests from 300 to 375, i.e. 75 more leads. At 4 % close on a GBP 12,000 deal, that's GBP 36,000 of additional revenue in the first year.
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FAQ
Does a redesign lose ranking?
Only if the 301 redirects are botched. A clean redirect plan, priced at GBP 900-2,200, preserves most acquired SEO and avoids 404 errors.
Redesign or full rebuild?
If the structure is sound, a design refresh suffices (GBP 10,000-15,000). If the CMS is obsolete or technical debt heavy, a rebuild (GBP 18,000-28,000) pays off better over the medium term.
How long does a redesign take?
Allow 6 to 12 weeks depending on page volume and migration complexity. Client-side content sign-off drives the schedule.
How do you measure the return?
Track conversion rate and Core Web Vitals before/after. An LCP gain from 4.2 s to 1.8 s and +20 % conversion translates directly into extra leads.
Can we keep existing content?
Yes, migration reuses your pages, but it's the chance to purge obsolete pages and restructure for SEO. Allow GBP 1,800 to 5,500 depending on volume.
Let's scope your project. Give us your current URL, CMS and conversion goals, and we'll price the audit and redesign separately. 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.
