The verdict in three sentences
A building services and energy engineering firm in Berlin that wants to grow beyond referrals should plan for a quote of EUR 6,500 to 12,000 excl. VAT, delivered in 7 weeks. What makes the difference with private clients is filterable project references (multi-family housing, offices, retrofit) and one page per service: energy compliance calculations (GEG), energy audits, HVAC design, dynamic thermal simulation. A realistic goal is to go from 4 to 15 qualified enquiries per month within 9 to 12 months.
The detailed quote, line by line
Developers, architects and asset managers launching a private tender check three things on your site: references on comparable projects, regulatory expertise and responsiveness. The quote is built around those three expectations.
| Item | Low range | High range |
|---|---|---|
| Scoping, site map and mockups | EUR 1,200 | EUR 2,200 |
| Site development (templates, responsive, performance) | EUR 2,800 | EUR 4,500 |
| Filterable project references module (type, area, label, city) | EUR 900 | EUR 2,000 |
| Service pages (GEG, audit, HVAC, simulation, heat pump sizing) | 6 pages | 12 pages |
| SEO copywriting at EUR 120 to 200 per page | EUR 720 | EUR 2,400 |
| Tender enquiry form with file upload (specs, drawings) | EUR 300 | EUR 600 |
| Technical SEO setup and Search Console monitoring | EUR 580 | EUR 300 |
| Total | EUR 6,500 | EUR 12,000 |
SEO copywriting at EUR 120 to 200 per page is often the most profitable line: a well-written "energy compliance calculation Berlin" page, with worked figures and lead times, ranks within a few months for a query clients actually type.
7-week schedule
| Week | Step | Firm's involvement |
|---|---|---|
| 1 | Scoping workshop, choice of 20 to 40 references to publish | 2 h interview with the managing director |
| 2 | Site map and key page mockups | Approval within 3 days |
| 3 and 4 | Development and references module | Sending project photos and data sheets |
| 4 and 5 | Writing service pages | Technical review by an engineer, 1 h per page |
| 6 | Content integration and QA | Testing the tender enquiry form |
| 7 | Launch, indexing, monitoring | 1 h training on updating references |
The main schedule risk is collecting references: an engineering firm often has dozens of projects but few ready-made sheets with photos, floor area and achieved performance. Providing a sheet template in week 1 avoids delaying the launch.
Expected ROI
The figures below are a 2026 estimate for a firm of 6 to 12 engineers in an active Berlin market (multi-family housing, offices, energy retrofit of the private stock).
| Indicator | Today | 12-month target |
|---|---|---|
| Monthly visits | 350 | 1,300 |
| Pages ranking on Google page one | 3 | 25 |
| Qualified enquiries per month | 4 | 15 |
| Conversion rate to signed job | 30% | 30% |
| Jobs signed per month via the site | 1.2 | 4.5 |
| Average job value | EUR 4,500 | EUR 4,500 |
Mini case study
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Lukas, managing director of a 9-person building services engineering firm in Berlin, currently signs about 1.2 jobs per month from the web. He invests EUR 9,500 excl. VAT in a site with 10 written service pages and 30 filterable references, plus EUR 150 per month of maintenance. At 12 months, with 15 qualified enquiries and a 30% close rate, he signs 4.5 jobs per month, i.e. 3.3 more jobs. At EUR 4,500 per job and a 35% margin, that is about EUR 5,200 of additional margin per month. The site pays back in two months once at cruising speed, and in about 6 months when the gradual ramp-up of search rankings is taken into account.
FAQ
How much does a website for a building services engineering firm cost?
A typical quote ranges from EUR 6,500 to 12,000 excl. VAT depending on the number of service pages and the depth of the references module. Maintenance then costs EUR 90 to 180 per month.
Why filterable project references?
Clients look for projects comparable to theirs, by building type, floor area or label. A filter shows your 5 closest projects to their tender in 2 clicks.
Should SEO copywriting be paid separately?
It is recommended: at EUR 120 to 200 per page, a specialist writer produces accurate technical content on energy compliance or audits. Allow 1 h of engineer review per page.
How quickly do enquiries increase?
The first enquiries from organic search usually arrive 3 to 4 months after launch. The target of 15 qualified enquiries per month is realistic at 9 to 12 months.
Can the site help with public tenders?
Indirectly: public buyers check your references before assessing bids. A dedicated public procurement page listing your certifications strengthens your application.
Let's scope your project. List your services and around ten references, and we will price a site between EUR 6,500 and 12,000 excl. VAT delivered in 7 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.
