Ombygning

Ombygning is the process of altering an existing building to change its function, form, or performance. In Danish and Norwegian usage, the term covers renovations, conversions, additions, and retrofits that modify an existing structure rather than constructing anew. The goal is typically to improve usability, safety, energy efficiency, or to adapt the building to a new occupant or use, while preserving parts of the original fabric when feasible.

Common forms include interior remodeling (reconfiguring rooms, upgrading services such as electrical and plumbing), facade or exterior renovations (re-cladding, insulation upgrades), structural alterations (removing or adding load-bearing elements, adding extensions or mezzanines), and full or partial conversions (e.g., converting a warehouse to offices, a house to multiple dwellings).

Process and regulation: Start with a feasibility study, then design and obtain permits from municipal authorities. Depending on jurisdiction, additional approvals may be required for listed buildings, protected facades, or heritage areas. Construction, inspections, and quality assurance follow.

Financial and environmental aspects: Costs vary widely; long-term energy savings and increased value can offset costs. Reusing an existing building reduces embodied energy and may qualify for energy subsidies or tax incentives. Risks include unforeseen structural issues, asbestos or lead, and disruption to occupants.