the question
Sustainable construction means building as little as possible. This makes it all the more important to critically assess existing building stock and reduce CO₂ emissions through renovation and transformation. Boltt contributed substantively to the development of the new ILS for Existing Buildings, drawing on its experience with the transformation of existing and historic buildings and its BIM methodology. That expertise formed the basis for working with other parties to establish clearer agreements on information exchange.
the approach
Information exchange in existing buildings differs significantly from that in new-build projects. It is therefore essential that all partners in the construction chain work according to the same methodology. The ILS Existing Buildings Working Group is developing new guidelines for information exchange in BIM. These guidelines are now being shared with the market for validation and feedback.
Designing for an existing building requires consideration of heritage values, structural possibilities and constraints, and the technical condition of the property. Because a BIM model functions not only as a design tool but also as a communication tool, it must be practical for all parties involved: consultants, surveyors, and contractors alike. The new ILS for Existing Buildings helps optimize the digital approach to projects involving existing buildings.
New ILS Guidelines
The BIM Basis ILS (Information Delivery Specifications) is a widely used guideline for collaboration and information exchange in new-build BIM projects. In practice, however, it offers insufficient guidance for structuring information in existing buildings. The ILS Existing Buildings Working Group began developing new guidelines for existing buildings in 2023. The resulting ILS has been established on the basis of use cases and practical additions.
Click here for the ILS Existing Buildings.
year
2025
services
BIM Coordination
BIM Implementation
Collaboration
Rijnboutt, BiermanHenket, Office Winhov, restoration contractor Nico de Bont | TBI, contractor Dura Vermeer, MEP consultants Huisman & van Muijen, and consulting firm Baseline
Want to make your building future-proof too?
We advise on sustainability measures and the BIM approach best suited to your project and requirements.
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More work we're proud of at
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