# When site managers build again: how an AI assistant secures VOB claims at F.X. Rauch

Source: https://blackmountain.io/ressources/case-studies/fx-rauch-voice-construction-reports

AI in the Mittelstand

Voice mode on the construction site: an AI assistant turns spoken notes into complete daily reports – and makes delay claims enforceable again.

Customer: F.X. Rauch

Industry: Natural stone construction

Modules: Assistant Studio, Chat (voice mode)

- **Minutes** from dictation to a complete draft report
- **€15k** pilot investment
- **4 steps** from process analysis to team enablement

The site manager is on the construction site, the phone rings, the client wants a status update. Yet the daily construction report – the key evidence for obstruction notices under the German VOB/B construction contract rules – is only written weeks later, from patchy memories and handwritten notes. What gets lost between site and paperwork is not just data but hard cash: additional costs and time extensions that are effectively written off because they cannot be substantiated. At F.X. Rauch Naturstein am Bau this frustration was part of everyday work – until an AI assistant turned documentation around and made legitimate claims enforceable again.

## Why the daily report decides between profit and loss

F.X. Rauch is a mid-sized natural stone construction company that lives with the tension between craftsmanship and administrative effort every day. The daily construction report is far more than a tedious form. It records activities, headcount, working hours and weather conditions and is the legal foundation for claims when construction is delayed. Without day-by-day evidence, obstruction notices under VOB/B have no effect, because contractors cannot substantiate their additional costs. Until now, site managers entered this data by hand into Excel templates and researched historical weather data afterwards – tying up valuable expertise in administration and causing structural delays.

## The double challenge of the Mittelstand

For companies like F.X. Rauch the difficulty is twofold: there is no staff for additional bureaucracy, and digitalisation must not come at the expense of data sovereignty. Many construction companies hesitate when it comes to cloud solutions from US providers that process sensitive contract data and personal information about employees. BlackMountain, a consultancy specialised in AI adoption, closes exactly this gap with a European, privacy-compliant platform. The principle behind it: technology has to adapt to everyday work, not the other way round. Only when the benefit is immediately tangible do people really adopt it.

## Voice mode on site: how the assistant works

The solution for F.X. Rauch is an AI assistant for the daily construction report that turns spoken language into structured documentation. On site, the site manager dictates the day’s activities in voice mode while working; within minutes the assistant produces a complete draft report. Weather data is retrieved and added automatically for each location and date, and personal fields such as employee names are encrypted. The implementation followed four steps: first understanding the process and preparing the data, then translating it into workflows, followed by platform onboarding with a pilot group and finally the systematic enablement of the team. The system was integrated into the existing server and Outlook landscape and can export reports for clients. The investment for this pilot phase is €15,000.

## The economics of documentation

The key insight is not the technology itself but the economic logic behind it. The pilot phase costs €15,000 – set against documented VOB claims that were previously worthless for lack of evidence. A single successfully asserted obstruction claim, for example for weather-related interruptions, can pay back the investment several times over. At the same time, expertise returns to where it is needed: the construction site. The site manager documents during the work instead of spending hours in the evening reconstructing what happened in the morning. The European platform ensures that all data is processed in line with GDPR – which is crucial for mid-sized companies without their own IT and compliance teams.

## From pilot to platform: an outlook for the Mittelstand

The project at F.X. Rauch shows that AI in the Mittelstand is not an abstract topic for the future but concrete operational relief. After the successful pilot, the roadmap is to open up further use cases by 2027 and to anchor the platform broadly across the company. For leaders in similar industries this points to a clear option: whoever treats documentation as a strategic process and invests in privacy-compliant AI workflows not only secures legal claims but wins back badly needed time for the core business. The technology is ready. The question is who will be the first to use it consistently.

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