The verdict in three sentences
A credible board-ready budget is not a single number but six costed line items plus a contingency. In 2026 in London, a B2B website rebuild sits between 25,000 and 55,000 GBP, excluding retainers. Plan a 10-15% contingency and fold in the recurring costs so your total cost of ownership holds up in front of the board.
The rebuild budget line by line
Here is the 2026 breakdown for a London B2B SME (marketing site + blog + resources, 15-25 pages).
| Line item | 2026 range (GBP) | Share of budget |
|---|---|---|
| Strategy / UX | 4,000 - 8,000 | 15-20% |
| UI design | 4,000 - 9,000 | 20% |
| Development / integration | 9,000 - 20,000 | 40% |
| Content + SEO copywriting | 2,000 - 6,000 | 10-15% |
| QA / testing | 1,000 - 3,000 | 5-8% |
| Contingency (10-15%) | 2,500 - 6,000 | 10-15% |
| Project total | 25,000 - 55,000 | 100% |
The development line is the heaviest (40%); the SEO content line is the most often underestimated yet decisive for traffic.
The retainers not to forget
A credible rebuild budget includes life after launch. Here are the 2026 retainers to present to the board.
| Recurring item | 2026 cost | Frequency |
|---|---|---|
| Managed hosting | 40 - 150 GBP | per month |
| Maintenance retainer | 200 - 700 GBP | per month |
| SEO / content | 300 - 1,000 GBP | per month (optional) |
| Domain renewal | 12 - 30 GBP | per year |
On a 30,000 GBP site, retainers represent 3,000 to 10,000 GBP/year: leaving them out distorts the TCO shown to the board.
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Mini case study
David, sales director at a London B2B SME, must present the rebuild budget to the board with every line justified.
His costing: strategy/UX 6,000 + design 7,000 + dev 15,000 + SEO content 4,000 + QA 2,000 + 12% contingency 4,000 = 38,000 GBP. Retainers: hosting 100 GBP/month + maintenance 400 GBP/month = 6,000 GBP/year. He presents a 3-year TCO of 56,000 GBP (project + retainers), line by line: the board approves without renegotiating, because every line is defensible.
FAQ
How much does a B2B website rebuild cost in London? Between 25,000 and 55,000 GBP in 2026 depending on design ambition, content volume and integrations. Always split into six line items for a defensible budget.
Why plan a contingency? Because 100% of projects hit surprises (late content, scope change). A 10-15% contingency avoids change orders and secures the budget shown to the board.
Is the content line really necessary? Yes: SEO copywriting (2,000-6,000 GBP) is what turns a nice site into a lead-generating one. It is the most cut and most regretted line.
What are the recurring costs? Hosting 40-150 GBP/month, maintenance 200-700 GBP/month, optional SEO. Budget 3,000 to 10,000 GBP/year in the 3-year TCO.
How do I avoid budget overruns? Fix the scope in a written brief, hold a 10-15% contingency and stage payments against milestones. That combination keeps a 2026 rebuild inside its envelope.
Let's scope your project. Give us your scope and target budget: we return a six-line rebuild budget, contingency and retainers included, board-ready. 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.
