The verdict in three sentences
An engineering consultancy doesn't sell design, it sells proof of technical competence: project references, calculation methods, accreditations and case data. In 2026 in London, a credible showcase site geared to winning tenders costs between 6,000 and 14,000 EUR (about 5,000-12,000 GBP) depending on the depth of project sheets and SEO. Return is measured in tenders won, not clicks.
2026 costing by block
Price depends mostly on the volume of technical content to structure (energy assessments, dynamic simulations, compliance studies) and the target SEO level.
| Deliverable block | 2026 range (EUR) | Lead time |
|---|---|---|
| Design + technical brand | 1,200 – 2,500 | 1-2 wks |
| Development (8-12 pages) | 2,000 – 4,000 | 2-3 wks |
| Project reference sheets (10-20) | 1,000 – 2,500 | 1-2 wks |
| Method & expertise pages | 600 – 1,500 | 1 wk |
| Technical SEO + copy | 1,000 – 2,800 | ongoing |
| Tender form + doc area | 400 – 900 | 1 wk |
| Total project | 6,000 – 14,000 | 7-10 wks |
Annual maintenance (hosting, updates, backups, security) is around 15%/year of the build cost, i.e. 900 to 2,100 EUR.
ROI measured in tenders
A consultancy answers 30 to 60 tenders a year on average. A site that documents references and reassures clients improves the shortlisting rate at bid stage.
| Metric | Before site | After credible site |
|---|---|---|
| Tenders / year | 40 | 40 |
| Shortlisting rate | 22% | 33% |
| Shortlists won | ~9 | ~13 |
| Avg margin / project | 12,000 EUR | 12,000 EUR |
| Estimated incremental revenue | — | ~48,000 EUR |
Winning four extra projects a year covers the website budget several times over. Treat it as a 2026 order of magnitude, adjusted to your average deal size.
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Mini case study
Daniel, managing director of a 7-person building-services engineering firm in London, invests 9,500 EUR in a site with 15 project sheets (commercial, residential, retrofit) and a methods page. Within 8 months, two public clients mention that the documented studies reassured them. Two extra projects signed (~24,000 EUR margin) give an ROI of 2.5x in the first year, maintenance included.
FAQ
Is a website enough to win tenders? No, but it counts at bid stage: a submission backed by references viewable online reassures the panel. Treat the site as a credibility multiplier, not a direct sales channel.
Should accreditations be highlighted? Yes, they are often eliminatory criteria in public tenders. They must be visible on the homepage and verifiable (number, validity date).
How many project sheets at launch? 10 to 20 structured sheets (context, brief, quantified results in kWh/m²/year) are enough to start. Enrich thereafter as projects complete.
Is SEO worth it for a consultancy? Yes, on precise queries like "building services engineer London" or "commercial energy assessment" — low volume, high intent. Good ranking generates 3 to 8 qualified enquiries a month.
How much is maintenance? About 15%/year of the build budget, i.e. 900 to 2,100 EUR, covering secure hosting, updates, backups and small content changes.
Let's scope your project. Tell us your specialism, how many references to publish and your target budget. 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.
