The verdict in three sentences
For a construction group with 450 employees and 3 subsidiaries, a serious redesign in the Netherlands costs 25,000 to 45,000 EUR and takes about 12 weeks, provided you arrive with a precise brief. The two items that swing the budget are the migration of 60 project references and the careers page, which already generates 30% of applications. A vague brief produces incomparable quotes, with gaps of 1 to 3 between agencies.
The sections of the brief and their budget weight
The brief must let every agency price the same scope. Here are the blocks to describe, with their indicative 2026 cost for a Dutch regional group.
| Brief block | What to specify | Indicative budget |
|---|---|---|
| Architecture and UX | Group + 3 subsidiaries sitemap, client and candidate journeys | 4,000 to 7,000 EUR |
| UI design | Brand, desktop and mobile mock-ups, 8 to 12 templates | 5,000 to 9,000 EUR |
| Development and CMS | Templates, back office per subsidiary, editor roles | 7,000 to 13,000 EUR |
| Project reference migration | 60 entries, photos, filters by trade and region | 3,000 to 5,500 EUR |
| Careers page | Vacancies, filters, 2-minute application, ATS link | 2,500 to 5,000 EUR |
| Performance, SEO and accessibility | LCP < 2.5 s, 301 redirects, WCAG 2.1 AA for EAA | 2,500 to 4,000 EUR |
| Testing and launch | Cross-browser tests, editor training | 1,000 to 1,500 EUR |
Ballpark total: 25,000 EUR for a controlled version on a standard CMS, up to 45,000 EUR with custom templates, a light intranet or deep integration with the HR system.
A realistic 12-week schedule
The main risk for a multi-subsidiary group is approval: three managing directors, three opinions. The schedule has to absorb those loops.
| Weeks | Phase | Deliverable | Approval on the group side |
|---|---|---|---|
| 1 to 2 | Scoping | Sitemap, redirect plan | Communications director |
| 3 to 5 | Design | Key template mock-ups | Board + subsidiaries |
| 6 to 9 | Development | Staging site | Communications director |
| 7 to 10 | Content migration | 60 references, vacancies | Subsidiary comms officers |
| 11 | Testing | Test report, Core Web Vitals, accessibility audit | Communications director + IT |
| 12 | Launch | Production site, training | Everyone |
Reference migration starts during development, not after. A complete project entry (photos, client, value, works delivered) takes 30 to 45 minutes to enter and check, so 60 entries mean 30 to 45 hours that must be clearly assigned to the agency or the group.
Technical requirements not to forget
A 7-year-old site usually carries slow pages and years of inbound links. Three requirements deserve to be written in black and white.
First, performance: set an LCP below 2.5 s on mobile and a CLS below 0.1, measured on the reference and careers pages. Second, the 301 redirect plan: every indexed old URL must point to its new version, or you lose part of your organic traffic for months. Third, accessibility: the European Accessibility Act has applied since June 2025 to many digital services, and Dutch public clients increasingly ask for WCAG 2.1 AA in tenders. Writing it into the brief avoids an expensive retrofit.
Mini case study
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Lotte, communications director of a construction group in Amsterdam (450 staff, 3 subsidiaries), receives 400 applications a year, 120 of them through the careers page. The brief requires an application flow under 2 minutes on mobile. If the redesign lifts those applications from 120 to 160, and a recruitment agency hire costs on average 8,000 EUR, avoiding 4 external hires a year saves 32,000 EUR. A 38,000 EUR redesign is paid back on that line alone in just over a year.
FAQ
What budget should a construction group plan for a website redesign in 2026?
For a Dutch regional group with several subsidiaries, plan 25,000 to 45,000 EUR. The range depends on the number of custom templates, content migration and HR integrations.
How long does this kind of redesign take?
About 12 weeks from scoping to launch. Add 2 to 3 weeks if the board and subsidiaries approve mock-ups separately.
Who should migrate the 60 project references?
Decide it in the brief. Outsourced to the agency, migration costs 3,000 to 5,500 EUR, done in-house it takes 30 to 45 hours of a communications officer's time.
Does the European Accessibility Act apply to our website?
It mainly targets consumer-facing services such as e-commerce and banking, but public-sector tenders and large clients already require WCAG 2.1 AA. Building it in from the start costs roughly 10 to 15% of the budget, much less than a later retrofit.
One site per subsidiary or a single site?
A single site with subsidiary sections cuts costs by 30 to 40% and concentrates SEO authority. Separate sites only make sense if subsidiaries have very distinct brands and clients.
Let's scope your project. Send us your current sitemap, the number of references to migrate and your budget range, and we will propose a 12-week plan. 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.
