The verdict in three sentences
A 25-page engineering consultancy website redesign costs between EUR 14,000 and EUR 22,000 excl. VAT in Berlin in 2026, with a 10-week timeline. The riskiest item is not the design but the SEO migration of the 180 existing URLs: one forgotten 301 redirect can cost 30% of organic traffic within a month. Done right, the redesign targets +40% qualified enquiries in 9 months thanks to project reference pages and a structured tender submission form.
Why a 2017 website no longer converts
In 2017, a building services consultancy presented itself with a "Capabilities" page and a client list. In 2026, a developer looking for an engineering firm for an energy performance compliance study (GEG in Germany), a mandatory energy audit or an energy certificate for a residential block compares three websites in five minutes. They want comparable projects (multi-family housing, offices, retrofit), metrics (primary energy demand, U-values, carbon footprint) and a simple way to send tender documents.
| Indicator | 2017 site (typical finding) | Target after redesign |
|---|---|---|
| Mobile load time (LCP) | 4.8 s | Under 2 s |
| Project reference pages | 0 to 5 | 30 to 40 case pages |
| Qualified enquiries per month | 6 | 8 to 9 after 9 months |
| Homepage bounce rate | 68% | 40 to 45% |
| Energy compliance keywords in top 10 | 3 | 15 to 25 |
| Tender form with attachments | No | Yes, up to 50 MB |
The detailed quote for a 25-page redesign
| Item (excl. VAT) | Low range | High range | Scope |
|---|---|---|---|
| Audit and SEO strategy | EUR 1,500 | EUR 2,500 | Crawl of 180 URLs, Search Console analysis |
| UX and mockups | EUR 2,500 | EUR 4,000 | Site map, 6 templates, mobile version |
| Development and CMS | EUR 5,500 | EUR 8,500 | 25 pages, filterable reference database |
| Migration and 301 redirects | EUR 1,200 | EUR 2,000 | Mapping plan, tests, 3-month monitoring |
| Copywriting and project pages | EUR 2,300 | EUR 3,500 | 30 reference pages, expertise pages |
| Tender submission form | EUR 1,000 | EUR 1,500 | Tender file upload, routing to project lead |
| Total | EUR 14,000 | EUR 22,000 | 10-week delivery |
| Monthly maintenance | EUR 250 | EUR 250 | Updates, backups, 2 h of changes |
The gap between the two ranges comes mainly from copywriting volume and how rich the reference database is (filters by building type, floor area, target label, location).
The 10-week roadmap
| Week | Stage | Deliverable | Client sign-off |
|---|---|---|---|
| 1 to 2 | Audit and scoping | Redirect plan, site map | Management committee |
| 3 to 4 | UX mockups | 6 desktop and mobile templates | Director and 1 project lead |
| 5 to 7 | Development | Site on staging | Functional acceptance |
| 6 to 8 | Content | 30 project pages, energy compliance pages | Lead engineers |
| 9 | SEO acceptance | 180 redirects tested, tags, sitemap | Cross-check |
| 10 | Go-live | DNS switch, Search Console monitoring | Review at D+30 and D+90 |
The classic bottleneck is weeks 6 to 8: engineers have no time to write. Plan a 45-minute interview per project, with the agency doing the writing.
Mini case study
Julian heads a 14-person building services engineering consultancy in Berlin and receives 6 qualified enquiries a month through his website. He converts 30% of them, with an average assignment of EUR 7,500 (compliance studies for small residential blocks, audits). With +40% enquiries after 9 months, he reaches 8.4 enquiries a month: 2.4 × 30% × EUR 7,500 = EUR 5,400 of extra revenue per month. For an EUR 18,000 redesign and EUR 3,000 a year in maintenance, payback comes around the 4th month after ramp-up.
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FAQ
How much does an engineering consultancy website redesign cost in 2026?
Between EUR 14,000 and 22,000 for 25 pages with SEO migration, copywriting and a tender form. A simple theme change without migration costs EUR 5,000 to 8,000 but puts your rankings at risk.
Will we lose our rankings during the redesign?
Not if all 180 URLs are 301-redirected to their new equivalent page. A temporary dip of 5 to 10% over 3 to 6 weeks is typical, followed by recovery.
How many project references should we publish?
Aim for 30 to 40 pages at launch, spread by building type (housing, offices, education, retrofit). Each well-documented page can attract 20 to 60 qualified visits a year.
What does EUR 250 a month of maintenance include?
Security updates, daily backups, uptime monitoring and 2 hours of changes per month. Extra hours are billed at around EUR 75 to 90.
Can large tender files be received through the site?
Yes, the form can accept files up to 50 MB or generate a secure upload link. Files are stored in the EU and deleted automatically after 12 months.
Let's scope your project. Send us your current website URL and your assignment types: we price a redesign at EUR 14,000 to 22,000 in 10 weeks, SEO migration included. 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.
