# Vienna digital building registry mandate > Live situation record from CLSTR: https://clstr.news/situations/vienna-digital-building-registry-mandate > Updated: 2026-08-24T22:21:04.000Z. Sources: 6. Developments: 2. Vienna has implemented a mandate requiring property owners to maintain a digital building registry, known as the Bauwerksbuch, for approximately 57,000 properties. Compliance deadlines are staggered based on the year of construction: buildings erected before 1919 must comply by the end of 2027, while those built between 1919 and 1945 have until the end of 2030. Non-compliance may result in administrative fines of up to 50,000 euros per instance. As regulatory requirements and renovation costs rise across Germany and Austria, concerns have emerged regarding the implementation of the Vienna registry. Expert Johann Kaiser has warned of potential bottlenecks, suggesting that up to 10,000 buildings might miss the initial deadline. This could lead to cumulative administrative fines estimated between 25 and 30 million euros. The registry aims to document structural conditions and maintenance needs to ensure long-term building safety and identify health hazards. ## Timeline ### 2026-08-24: Building renovation costs and regulatory requirements rise in Germany and Austria Property owners in Germany face rising renovation costs and subsidy requirements, while Vienna implements mandatory building registries for older structures to ensure safety and maintenance. 6 sources. https://clstr.news/cluster/building-renovation-costs-and-regulatory-requirements-rise-in-germany-and-austria ### 2026-08-16: Vienna mandates digital building registries for 57,000 properties Vienna property owners must comply with new digital building registry mandates for approximately 57,000 buildings, with deadlines varying by construction era and fines reaching 50,000 euros. 3 sources. https://clstr.news/cluster/vienna-mandates-digital-building-registries-for-57000-properties --- Cite as: Vienna digital building registry mandate. CLSTR, https://clstr.news/situations/vienna-digital-building-registry-mandate