The verdict in three sentences
Up against the big engineering firms, an energy transition consultancy in Berlin does not win on brand awareness but on proof: quantified case studies, verifiable kWh and CO2 savings, a partner you can identify. A website built for that costs roughly EUR 8,000 to 15,000 in 2026 with 10 case studies, plus about EUR 2,000 for a compliance calculator and EUR 100 a month of maintenance. A well-placed calculator generates on average 2 to 4 qualified leads a week, the best cost per contact in the marketing budget.
The 2026 budget for a consultancy website
The amounts below are 2026 orders of magnitude from Berlin agencies for a consultancy with 5 to 25 consultants.
| Item | Content | Budget (ex VAT) | Timeline |
|---|---|---|---|
| Strategy and sitemap | Offers, segments (commercial, industry, municipalities), journeys | EUR 900 - 1,700 | 1 week |
| Design and build | 12 - 20 pages, DE/EN | EUR 4,000 - 7,500 | 4 - 6 weeks |
| 10 quantified case studies | Writing, client interview, before/after visuals | EUR 2,200 - 4,200 | 3 - 4 weeks |
| Compliance calculator | Floor area, use, consumption, legal targets | EUR 1,700 - 2,400 | 2 weeks |
| Technical and local SEO | Markup, service pages, Google profile | EUR 800 - 1,600 | Included |
| Maintenance | Updates, backups, security | EUR 70 - 160/month | - |
For comparison, Kolonell's grid places this kind of site in Premium, 2,000,000 - 3,500,000 FCFA (EUR 3,050 - 5,340), with maintenance at 35,000, 75,000 or 120,000 FCFA per month (EUR 50, 110 or 180) and monthly SEO from 100,000 FCFA (EUR 150) through our SEO packages.
What turns a visitor into a meeting
Decision makers looking for an energy audit or support with the Energy Efficiency Act (EnEfG) and the Buildings Energy Act (GEG) compare 3 to 5 consultancies. They pick the one that shows results on a building or plant comparable to theirs.
| Website element | Weak version | Converting version | Expected effect (estimate) |
|---|---|---|---|
| Case studies | Client logos with no figures | Area, kWh before/after, EUR saved, timeline | x2 on contact rate |
| Compliance calculator | Missing | Gap-to-target estimate + email | 2 - 4 leads per week |
| Page per segment | One "Our services" page | Commercial, industry, municipalities, landlords | +30 % time on site |
| Proof of expertise | Generic copy | Accreditations (BAFA energy auditor), partner CVs | Credibility in tenders |
| Booking | Generic form | 30-minute slot with a partner | -50 % time to first call |
| Content | Rare news posts | 1 article a month on regulation | Steady organic visits |
The calculator works because it answers a precise worry of the facility manager: "how far am I from the target?". In exchange for the detailed result, they leave their email and portfolio size, which qualifies the lead before the first call.
Mini case study
Claudia, partner at an 8-consultant energy transition consultancy in Berlin, invests EUR 12,000 in the website and EUR 2,000 in the calculator. With 3 qualified leads a week over 46 weeks, she gets 138 contacts a year. If 10 % become engagements averaging EUR 9,500 (audit and action plan), that is 14 engagements and EUR 133,000 in revenue. Total first-year cost, including EUR 100 monthly maintenance, is EUR 15,200: the investment is covered by fewer than 2 engagements.
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FAQ
How many case studies do we need to be credible?
Ten case studies usually cover the 3 or 4 main segments with 2 to 3 examples each. Each study should show at least 3 figures: area, consumption before/after and annual saving in EUR.
Does the compliance calculator need to be exact?
It gives an estimate, not an audit: it compares declared consumption with the applicable thresholds and targets. State the margin of error clearly, often 15 to 25 %, and offer the audit to refine it.
Do we need a bilingual German-English site in Berlin?
For a consultancy targeting international corporates with German sites, yes: allow EUR 1,500 to 3,000 extra for English translation and SEO. International groups often account for 15 to 30 % of enquiries.
How quickly does the site generate leads?
The calculator produces contacts from launch if you promote it on LinkedIn and by email. Organic search visits need 4 to 6 months to reach a steady pace.
What does post-launch follow-up cost?
Allow EUR 70 to 160 a month for technical maintenance, plus 1 article a month on regulation (EUR 350 to 650) if you do not write it in-house. That pace is enough to stay visible on regulatory searches.
Let's scope your project. Send us your offers, your target segments and 3 engagements you are proud of: we will scope the case studies, the calculator, the budget and the timeline. 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.
