The verdict in three sentences
An engineering consultancy whose website dates from 2017 loses leads because of slow pages, content that predates current energy regulations and eroding search rankings. A redesign at EUR 6,000 to 11,000 keeps the SEO history, whereas a new site costs EUR 9,000 to 15,000 and starts from scratch. Success hinges on one deliverable: a clean 301 redirect plan for the 120 reference pages.
Redesign or new build: what changes in the quote
A redesign reuses the structure that works, rewrites pages that no longer convert and migrates content. A new build rethinks everything, positioning included. For a consultancy of 10 to 25 engineers in Berlin, the price gap is rarely justified if the brand stays the same.
| Item | Redesign | New build | Comment |
|---|---|---|---|
| SEO and analytics audit of the current site | EUR 800 to 1,200 | EUR 800 to 1,200 | Essential in both cases |
| Design and front-end build | EUR 2,500 to 4,500 | EUR 4,000 to 6,500 | Redesign reuses templates |
| Migration of 120 reference pages | EUR 1,200 to 2,200 | EUR 2,000 to 3,500 | Import, cleanup, markup |
| 301 redirect plan | EUR 400 to 800 | EUR 600 to 1,000 | One line per old URL |
| Core Web Vitals optimisation | EUR 600 to 1,200 | included | Target LCP < 2.5 s |
| Copy for energy-regulation service pages | EUR 500 to 1,100 | EUR 1,000 to 2,300 | Thermal studies, energy audits, building energy act |
| Total | EUR 6,000 to 11,000 | EUR 9,000 to 15,000 | 6 to 10 weeks |
Maintenance runs around EUR 120 a month: hosting, backups, updates and one hour of changes.
Why your 2017 site no longer brings in leads
Three causes appear in almost every audit of engineering consultancies. Service pages still describe outdated regulations, while clients search for current energy-compliance studies and commercial energy audits. The site loads in 4 to 6 seconds on mobile because of uncompressed site photos. Finally, the 120 references are near-empty pages with no floor area, building type or performance achieved.
| Metric | Typical 2017 site | Target after redesign | Expected impact |
|---|---|---|---|
| Mobile LCP | 4.2 s | < 2.5 s | Better rankings, lower bounce |
| Service page bounce rate | 68% | 45 to 50% | More pages per visit |
| Indexed reference pages | 40 of 120 | 110 of 120 | Long-tail traffic |
| Contact form | 1 free-text field | Project type, floor area, deadline | Better-qualified leads |
| Qualified leads per month | 8 | 11 to 13 | +35 to 60% in 6 months |
| Current regulation pages | missing | dedicated pages | 2026 queries captured |
301 redirects: the make-or-break item
Every old URL must point to its new equivalent, with no redirect chains. A redesign without this plan can lose 30 to 50% of organic traffic in a month. The method: export every URL (Search Console and a crawl), map each page to its new address, test before go-live, then monitor 404 errors for 8 weeks.
Mini case study
Isabelle runs an 18-person thermal engineering consultancy. She chooses a redesign at EUR 8,500 plus EUR 120 a month, or EUR 9,940 in year one. Her site goes from 8 to 12 qualified leads a month (+50%). With a 25% signing rate and an average assignment of EUR 3,200, the 4 extra monthly leads produce 12 assignments and EUR 38,400 of additional revenue a year. Payback arrives around month four.
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FAQ
How long does this kind of redesign take?
Between 6 and 10 weeks, including 2 weeks of audit and redirect planning. Migrating the 120 references often accounts for 25% of total time.
Will we lose rankings during the switch?
A 5 to 10% dip for 2 to 4 weeks is normal. Beyond 20%, the redirect plan is incomplete and must be fixed quickly.
Do all reference pages need rewriting?
No: enriching the 30 most visited with floor area, building type and energy savings is enough to start. The other 90 can be completed through maintenance.
Is an LCP under 2.5 s really achievable?
Yes, with WebP or AVIF images, EU hosting and a lightweight theme. Most redesigns reach 1.5 to 2.2 s on mobile.
Is the EUR 120 monthly maintenance mandatory?
It is not required, but a site without security updates becomes vulnerable within months. It costs less than EUR 1,500 a year.
Let's scope your project. Send us your current URL and your lead target: we deliver an audit, a redirect plan and a redesign quote between EUR 6,000 and 11,000 over 6 to 10 weeks. 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.
