Executive Summary
The Federal Office of Buildings and Logistics (BBL) has submitted a building permit application for the renovation of the main building on the Lohn estate in Kehrsatz (Bern). This historic ensemble of national significance is used for official events of the Swiss Confederation and will undergo a comprehensive renovation for the first time in 65 years. Total costs amount to 9 million francs. Work will run from October 2026 to mid-2029, during which time the building will not be usable.
Persons
- Federal Office of Buildings and Logistics BBL (Client)
Topics
- Heritage preservation and restoration
- Energy-efficient renovation
- Accessibility
- Federal properties
Clarus Lead
The renovation of Lohn estate is part of a broader strategy to modernize federal properties while adhering to heritage preservation standards. With a focus on energy modernization – particularly replacing fossil fuel heating with district heating – the federal government is signaling its commitment to decarbonization even for historically valuable properties. The three-year closure presents an operational challenge but requires careful planning to preserve the protected heritage assets.
Detailed Summary
Lohn estate serves as a central representative venue for official state events of the Swiss Confederation and enjoys status as a historic ensemble of national significance. The main building is in a condition that justifies comprehensive modernization – the last renovation was 65 years ago.
The renovation program combines heritage protection with contemporary requirements. In the energy sector, the existing fossil fuel heating system will be replaced with a district heating connection; additionally, roof insulation and the installation of thermal protection glazing will be carried out. A new elevator will provide access to all relevant floors and enable barrier-free access for people with mobility restrictions – an adaptation to modern accessibility standards. The cost estimate of 9 million francs includes project planning, site management, construction and restoration work, as well as relocation and refurbishment of historic fixtures. The cantonal heritage preservation authority is involved in development and implementation to ensure substance protection.
Key Statements
- First major renovation of the main building since 1961; investment of 9 million francs
- Focus on energy modernization with district heating connection and thermal insulation
- Accessibility through elevator installation; close collaboration with heritage preservation
- Operational interruption from October 2026 to mid-2029
Critical Questions
Evidence/Data Quality: Is the 9 million franc cost estimate based on comparable renovation projects of similar size and complexity, or is it a preliminary estimate with significant risk of cost overruns?
Conflicts of Interest/Incentives: To what extent does the cantonal heritage preservation authority have a say in cost decisions, and how are potential conflicts between maximum heritage protection compliance and cost efficiency resolved?
Causality/Alternatives: Was a partial renovation (e.g., energy efficiency only without complete restoration) or a phased renovation during operation evaluated as an alternative to avoid the three-year operational interruption?
Feasibility/Risks: How is it ensured that the district heating infrastructure in Kehrsatz will be available at the planned time, and what buffer time is planned for unforeseen delays in restoration work?
Side Effects: What impact does the three-year unavailability have on federal protocol, and are there alternative venues for official events?
Source Directory
Primary Source: Federal Office of Buildings and Logistics (BBL) – Media Release of 30.04.2026 https://www.news.admin.ch/de/newnsb/OZlEFPBj0PuR1vcwQBCdE
Verification Status: ✓ 30.04.2026
This text was created with the support of an AI model. Editorial Responsibility: clarus.news | Fact-Check: 30.04.2026